Dr. ERIC R SWITZER

Dr. ERIC R SWITZER

  • RSCH AST, STLR GALCTIC&XTRGLTC ASTR
  • 301.614.5174
  • NASA/GSFC
  • Mail Code: 665
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    Dr. Eric Switzer is an Astrophysicist in the Observational Cosmology Laboratory at the Goddard Space Flight Center in Greenbelt, Maryland. His research relates observations of diffuse cosmic background radiation to models of our universe at large. He joined the Goddard Space Flight Center (GSFC) in the summer of 2013, and is working with the PIPER collaboration.

    Prior to joining GSFC, Eric was a senior research associate at the Canadian Institute for Theoretical Astrophysics (CITA) and a Kavli Fellow at the Kavli Institute for Cosmological Physics (KICP).

    Research Interests

    EXCLAIM and Intensity mapping

    The light emitted by atomic transitions in the distant universe will be redshifted by the time it reaches us today. By measuring the spectrum over a region of the sky, an experiment can infer the three-dimensional distribution of matter in a large volume of the universe, based on the atomic radiation.

    The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a cryogenic balloon-borne instrument that will survey galaxy and star formation history over cosmological time scales. Rather than identifying individual objects, EXCLAIM will be a pathfinder to demonstrate an intensity mapping approach. EXCLAIM will operate at 420-540 GHz with a spectral resolution R=512 to measure the integrated CO and [CII] in redshift windows spanning 0 < z < 3.5. CO and [CII] line emissions are key tracers of the gas phases in the interstellar medium involved in star-formation processes. EXCLAIM will shed light on questions such as why the star formation rate declines at z < 2, despite continued clustering of the dark matter. The instrument will employ an array of six superconducting integrated grating-analog spectrometers (micro-spec) coupled to microwave kinetic inductance detectors (MKIDs).

    Through a previous collaboration based at CITA, Eric analyzed the statistical distribution of matter when the universe was half its present size, using the 21 cm transition of neutral hydrogen and data acquired with the Green Bank Telescope. 

    CMB Polarization on large angular scales -- PIPER

    PIPER is a balloon-borne telescope designed to search for a particular polarization signature in the cosmic microwave background (CMB) which is thought to originate uniquely from processes in the very early universe, at energy scales that will be too high to probe in a terrestrial laboratory. PIPER will map most of the sky in millimeter-wavelengths using cryogenic Transition Edge Sensors and a novel polarization modulation scheme. It avoids warm windows by using the ARCADE bucket dewar, where optics are kept cold and dry through liquid and gaseous helium. It will fly for only around one day, and repeat flights at several frequencies from northern- and southern-hemisphere sites.

    High-resolution measurements of CMB intensity and polarization

    High-resolution measurements of the CMB intensity have acheived great precision through the Planck Satellite, the Atacama Cosmology Telescope (ACT), and the South Pole Telescope (SPT). In addition to supporting a standard cosmological model of the universe dominated by dark energy and matter, these experiments have measured the gravitational lensing of the CMB by intervening matter, and the perturbations to the CMB spectrum from the largest clusters of galaxies in the universe. They have also provided an independent check on the number of neutrino species and helium abundance in the early universe. Eric was part of the team that developed ACT and its successor ACTPol, and participated in an analysis of galaxies detected with SPT.

    Atoms in the cosmos

    The early universe was a hot, ionized, and highly uniform gas. As it cooled through expansion, the gas could become neutral and transparent, liberating the thermal photons that are observed today as the cosmic microwave background (CMB). A detailed understanding of this cosmological recombination is required to interpret precise CMB anisotropy measurements of WMAP/Planck/ACT/SPT. Eric refined the calculation of helium recombination, and was part of the community that brought the previous generation of calculations to a higher level of precision for modern CMB experiments. Following recombination, the first luminous objects are fueled by gas and reionize the universe -- atoms provide a diagnostic of this rich evolution up to the present.

    Current Projects

    PI - The Experiment for Cryogenic Large-aperture Intensity Mapping (EXCLAIM)

    Deputy PI - The Primordial Inflation Polarization Explorer (PIPER)

    Science Lead - Legacy Archive for Microwave Background Data Analysis (LAMBDA)

    Positions/Employment

    8/2013 - Present

    Astrophysicist

    Goddard Space Flight Center, Greenbelt, Maryland
    9/2011 - 8/2013

    Senior Research Associate

    Canadian Institute for Theoretical Astrophysics (CITA), Toronto, Ontario  
    10/2008 - 9/2011

    Kavli Fellow

    Kavli Institute for Cosmological Physics (KICP), Chicago, Illinois  

    Education

    • Ph.D., physics -- Princeton University (2008) under Lyman Page and Chris Hirata
    • B.A., physics with specialization in astrophysics -- University of Chicago (2003)

    Selected Publications

    Refereed

    Switzer, E., P. Ade, C. Anderson, et al. E. Barrentine, N. Bellis, A. Bolatto, P. Breysse, B. Bulcha, G. Cataldo, J. Connors, P. Cursey, N. Ehsan, H. Grant, T. Essinger-Hileman, L. Hess, M. Kimball, A. Kogut, A. Lamb, L. Lowe, P. Mauskopf, J. McMahon, M. Mirzaei, S. Moseley, J. Mugge-Durum, O. Noroozian, U. Pen, A. Pullen, S. Rodriguez, P. Shirron, R. Somerville, T. Stevenson, C. Tucker, E. Visbal, C. Volpert, E. Wollack, and S. Yang. 2019. "The Experiment for Cryogenic Large-aperture Intensity Mapping (EXCLAIM)." JLTP, arXiv:1912.07118. (Accepted)

    Yang, S., A. R. Pullen, and E. R. Switzer. 2019. "Evidence for C II diffuse line emission at redshift z ̃ 2.6." Monthly Notices of the Royal Astronomical Society, 489 (1): L53-L57 [10.1093/mnrasl/slz126]

    Switzer, E. R., P. Ade, T. Baildon, et al. D. Benford, C. Bennett, D. Chuss, R. Datta, J. Eimer, D. Fixsen, N. Gandilo, T. Essinger-Hileman, M. Halpern, G. Hilton, K. Irwin, C. Jhabvala, M. Kimball, A. Kogut, J. Lazear, L. Lowe, J. McMahon, T. Miller, P. Mirel, S. Moseley, S. Pawlyk, S. Rodriguez, E. Sharp, P. Shirron, J. Staguhn, D. Sullivan, P. Taraschi, C. Tucker, A. Walts, E. Wollack, and E. R. Switzer. 2019. "Sub-Kelvin cooling for two kilopixel bolometer arrays in the PIPER receiver." Review of Scientific Instruments, 90 (9): 095104 [10.1063/1.5108649]

    Cataldo, G., E. M. Barrentine, B. T. Bulcha, et al. N. Ehsan, L. A. Hess, O. Noroozian, T. R. Stevenson, E. J. Wollack, S. H. Moseley, and E. R. Switzer. 2019. "Second-generation Micro-Spec: A compact spectrometer for far-infrared and submillimeter space missions." Acta Astronautica, 162: 155-159 [10.1016/j.actaastro.2019.06.012]

    Datta, R., S. Aiola, S. K. Choi, et al. M. Devlin, J. Dunkley, D. , P. A. Gallardo, M. Gralla, M. Halpern, M. Hasselfield, M. Hilton, A. D. Hincks, S.-P. P. Ho, J. Hubmayr, K. M. Huffenberger, J. P. Hughes, A. Kosowsky, C. H. L'opez-Caraballo, T. Louis, M. Lungu, T. Marriage, L. Maurin, J. McMahon, K. Moodley, S. K. Naess, F. Nati, M. D. Niemack, L. A. Page, B. Partridge, H. Prince, S. T. Staggs, E. R. Switzer, E. J. Wollack, and G. Farren. 2019. "The Atacama Cosmology Telescope: two-season ACTPol extragalactic point sources and their polarization properties." Monthly Notices of the Royal Astronomical Society, 486 (4): 5239-5262 [10.1093/mnras/sty2934]

    Switzer, E. R., C. Anderson, A. Pullen, and S. Yang. 2019. "Intensity Mapping in the Presence of Foregrounds and Correlated Continuum Emission." The Astrophysical Journal, 872 (1): 82 [10.3847/1538-4357/aaf9ab]

    Pawlyk, S., P. A. Ade, D. Benford, et al. C. L. Bennett, D. T. Chuss, R. Datta, J. L. Dotson, J. R. Eimer, D. J. Fixsen, N. N. Gand ilo, T. M. Essinger-Hileman, M. Halpern, G. Hilton, G. F. Hinshaw, K. Irwin, C. Jhabvala, M. Kimball, A. Kogut, L. Lowe, J. J. McMahon, T. M. Miller, P. Mirel, S. H. Moseley, S. Rodriguez, E. Sharp, P. Shirron, J. G. Staguhn, D. F. Sullivan, E. R. Switzer, P. Taraschi, C. E. Tucker, A. Walts, and E. J. Wollack. 2018. "The primordial inflation polarization explorer (PIPER): current status and performance of the first flight." SPIE, 10708: 1070806 [10.1117/12.2313874]

    Anderson, C., N. Luciw, Y.-C. Li, et al. C. Kuo, J. Yadav, K. Masui, T.-C. Chang, X. Chen, N. Oppermann, Y.-W. Liao, U.-L. Pen, D. Price, L. Staveley-Smith, E. Switzer, P. Timbie, and L. Wolz. 2018. "Low-amplitude clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities." Monthly Notices of the Royal Astronomical Society, 476 (3): 3382-3392 (Accepted) [10.1093/mnras/sty346]

    Switzer, E. R. 2017. "Tracing the Cosmological Evolution of Stars and Cold Gas with CMB Spectral Surveys." The Astrophysical Journal, 838 (2): 82 [10.3847/1538-4357/aa6576]

    Switzer, E. R., and D. J. Watts. 2016. "Robust likelihoods for inflationary gravitational waves from maps of cosmic microwave background polarization." Physical Review D, 94 (6): 063526 [10.1103/PhysRevD.94.063526]

    Miller, N. J., D. T. Chuss, T. A. Marriage, et al. E. J. Wollack, J. W. Appel, C. L. Bennett, J. Eimer, T. Essinger-Hileman, D. J. Fixsen, K. Harrington, S. H. Moseley, K. Rostem, E. R. Switzer, and D. J. Watts. 2016. "Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators." The Astrophysical Journal, 818 (2): 151 [10.3847/0004-637X/818/2/151]

    Switzer, E., T.-C. Chang, K. Masui, U.-L. Pen, and T. Voytek. 2015. "Interpreting the Unresolved Intensity of Cosmologically Redshifted Line Radiation." The Astrophysical Journal, 815: 51 [10.1088/0004-637X/815/1/51]

    Hand, N., A. Leauthaud, S. Das, et al. B. Sherwin, G. Addison, J. Bond, E. Calabrese, A. Charbonnier, M. Devlin, J. Dunkley, T. Erben, A. Hajian, M. Halpern, J. Harnois-D'eraps, C. Heymans, H. Hildebrandt, A. Hincks, J.-P. Kneib, A. Kosowsky, M. Makler, L. Miller, K. Moodley, B. Moraes, M. Niemack, L. Page, B. Partridge, N. Sehgal, H. Shan, J. Sievers, D. Spergel, S. Staggs, E. Switzer, J. Taylor, L. Van Waerbeke, C. Welker, and E. Wollack. 2015. "First measurement of the cross-correlation of CMB lensing and galaxy lensing." Physical Review D, 91 (6): 062001 [10.1103/PhysRevD.91.062001]

    Switzer, E. R., and A. Liu. 2014. "Erasing the Variable: Empirical Foreground Discovery for Global 21 cm Spectrum Experiments." The Astrophysical Journal, 793 (2): 102.

    Lazear, J. S., P. Ade, D. J. Benford, et al. C. L. Bennett, D. T. Chuss, J. L. Dotson, J. R. Eimer, D. J. Fixsen, M. Halpern, G. Hilton, J. R. Hinderks, G. Hinshaw, K. Irwin, C. A. Jhabvala, B. Johnson, A. J. Kogut, L. N. Lowe, J. McMahon, T. M. Miller, P. Mirel, S. H. Moseley, S. Rodriguez, E. H. Sharp, J. G. Staguhn, E. R. Switzer, C. Tucker, A. Weston, and E. J. Wollack. 2014. "The Primordial Inflation Polarization Explorer (PIPER)." Proceedings of the SPIE, 9153:

    Masui, K. W., E. R. Switzer, N. Banavar, et al. K. Bandura, C. Blake, L. M. Calin, T. C. Chang, X. Chen, Y. C. Li, Y. W. Liao, A. Natarajan, U. L. Pen, J. B. Peterson, J. R. Shaw, and T. C. Voytek. 2013. "Measurement of 21 cm Brightness Fluctuations at z ~ 0.8 in Cross-correlation." ApJL, 763: L20.

    Switzer, E. R., K. W. Masui, K. Bandura, et al. L. M. Calin, T. C. Chang, X. L. Chen, Y. C. Li, Y. W. Liao, A. Natarajan, U. L. Pen, J. B. Peterson, J. R. Shaw, and T. C. Voytek. 2013. "Determination of z ~ 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation." MNRASL, 434: L46.

    Farhang, M., J. R. Bond, J. Chluba, and E. R. Switzer. 2013. "Constraints on Perturbations to the Recombination History from Measurements of the Cosmic Microwave Background Damping Tail." ApJ, 764: 137.

    Calabrese, E., R. A. Hlozek, N. Battaglia, et al. E. S. Battistelli, J. R. Bond, J. Chluba, D. Crichton, S. Das, M. J. Devlin, J. Dunkley, R. Dunner, M. Farhang, M. B. Gralla, A. Hajian, M. Halpern, M. Hasselfield, A. D. Hincks, K. D. Irwin, A. Kosowsky, T. Louis, T. A. Marriage, K. Moodley, L. Newburgh, M. D. Niemack, M. R. Nolta, L. A. Page, N. Sehgal, B. D. Sherwin, J. L. Sievers, C. Sifon, D. N. Spergel, S. T. Staggs, E. R. Switzer, and E. J. Wollack. 2013. "Cosmological parameters from pre-planck cosmic microwave background measurements." PRD, 87: 103012.

    Chluba, J., E. Switzer, K. Nelson, and D. Nagai. 2013. "Sunyaev-Zeldovich signal processing and temperature-velocity moment method for individual clusters." MNRAS, 430: 3054.

    Dunner, R., M. Hasselfield, T. A. Marriage, et al. J. Sievers, V. Acquaviva, G. E. Addison, P. Ade, P. Aguirre, M. Amiri, J. W. Appel, L. F. Barrientos, E. S. Battistelli, J. R. Bond, B. Brown, B. Burger, E. Calabrese, J. Chervenak, S. Das, M. J. Devlin, S. R. Dicker, W. Bertrand Doriese, J. Dunkley, T. Essinger-Hileman, R. P. Fisher, M. B. Gralla, J. W. Fowler, A. Hajian, M. Halpern, C. Hernandez-Monteagudo, G. C. Hilton, M. Hilton, A. D. Hincks, R. Hlozek, K. M. Huffenberger, D. H. Hughes, J. P. Hughes, L. Infante, K. D. Irwin, J. Baptiste Juin, M. Kaul, J. Klein, A. Kosowsky, J. M. Lau, M. Limon, Y. Lin, T. Louis, R. H. Lupton, D. Marsden, K. Martocci, P. Mauskopf, F. Menanteau, K. Moodley, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, B. Partridge, H. Quintana, B. Reid, N. Sehgal, B. D. Sherwin, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, H. Trac, C. Tucker, R. Warne, G. Wilson, E. Wollack, and Y. Zhao. 2013. "The Atacama Cosmology Telescope: Data Characterization and Mapmaking." ApJ, 762: 10.

    Hand, N., G. E. Addison, E. Aubourg, et al. N. Battaglia, E. S. Battistelli, D. Bizyaev, J. R. Bond, H. Brewington, J. Brinkmann, B. R. Brown, S. Das, K. S. Dawson, M. J. Devlin, J. Dunkley, R. Dunner, D. J. Eisenstein, J. W. Fowler, M. B. Gralla, A. Hajian, M. Halpern, M. Hilton, A. D. Hincks, R. Hlozek, J. P. Hughes, L. Infante, K. D. Irwin, A. Kosowsky, Y. Lin, E. Malanushenko, V. Malanushenko, T. A. Marriage, D. Marsden, F. Menanteau, K. Moodley, M. D. Niemack, M. R. Nolta, D. Oravetz, L. A. Page, N. Palanque-Delabrouille, K. Pan, E. D. Reese, D. J. Schlegel, D. P. Schneider, N. Sehgal, A. Shelden, J. Sievers, C. Sifon, A. Simmons, S. Snedden, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, H. Trac, B. A. Weaver, E. J. Wollack, C. Yeche, and C. Zunckel. 2012. "Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect." PRL, 109: 41101.

    Dunkley, J., R. Hlozek, J. Sievers, et al. V. Acquaviva, P. Ade, P. Aguirre, M. Amiri, J. W. Appel, L. F. Barrientos, E. S. Battistelli, J. R. Bond, B. Brown, B. Burger, J. Chervenak, S. Das, M. J. Devlin, S. R. Dicker, W. Bertrand Doriese, R. Dunner, T. Essinger-Hileman, R. P. Fisher, J. W. Fowler, A. Hajian, M. Halpern, M. Hasselfield, C. Hernandez-Monteagudo, G. C. Hilton, M. Hilton, A. D. Hincks, K. M. Huffenberger, D. H. Hughes, J. P. Hughes, L. Infante, K. D. Irwin, J. B. Juin, M. Kaul, J. Klein, A. Kosowsky, J. M. Lau, M. Limon, Y. T. Lin, R. H. Lupton, T. A. Marriage, D. Marsden, P. Mauskopf, F. Menanteau, K. Moodley, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, B. Partridge, B. Reid, N. Sehgal, B. Sherwin, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, H. Trac, C. Tucker, R. Warne, E. Wollack, and Y. Zhao. 2011. "The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectrum." ApJ, 739: 52.

    Sherwin, B. D., J. Dunkley, S. Das, et al. J. W. Appel, J. R. Bond, C. S. Carvalho, M. J. Devlin, R. Dunner, T. Essinger-Hileman, J. W. Fowler, A. Hajian, M. Halpern, M. Hasselfield, A. D. Hincks, R. Hlozek, J. P. Hughes, K. D. Irwin, J. Klein, A. Kosowsky, T. A. Marriage, D. Marsden, K. Moodley, F. Menanteau, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, E. D. Reese, B. L. Schmitt, N. Sehgal, J. Sievers, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, K. Visnjic, and E. Wollack. 2011. "Evidence for Dark Energy from the Cosmic Microwave Background Alone Using the Atacama Cosmology Telescope Lensing Measurements." PRL, 107: 21302.

    Swetz, D. S., P. Ade, M. Amiri, et al. J. W. Appel, E. S. Battistelli, B. Burger, J. Chervenak, M. J. Devlin, S. R. Dicker, W. B. Doriese, R. Dunner, T. Essinger-Hileman, R. P. Fisher, J. W. Fowler, M. Halpern, M. Hasselfield, G. C. Hilton, A. D. Hincks, K. D. Irwin, N. Jarosik, M. Kaul, J. Klein, J. M. Lau, M. Limon, T. A. Marriage, D. Marsden, K. Martocci, P. Mauskopf, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, S. T. Staggs, O. Stryzak, E. R. Switzer, R. Thornton, C. Tucker, E. Wollack, and Y. Zhao. 2011. "Overview of the Atacama Cosmology Telescope: Receiver, Instrumentation, and Telescope Systems." ApJS, 194: 41.

    Abbot, D. S., and E. R. Switzer. 2011. "The Steppenwolf: A Proposal for a Habitable Planet in Interstellar Space." ApJL, 735: L27.

    Vieira, J. D., T. M. Crawford, E. R. Switzer, et al. P. Ade, K. A. Aird, M. Ashby, B. A. Benson, L. E. Bleem, M. Brodwin, J. E. Carlstrom, C. L. Chang, H. M. Cho, A. T. Crites, T. de Haan, M. A. Dobbs, W. Everett, E. M. George, M. Gladders, N. R. Hall, N. W. Halverson, F. W. High, G. P. Holder, W. L. Holzapfel, J. D. Hrubes, M. Joy, R. Keisler, L. Knox, A. T. Lee, E. M. Leitch, M. Lueker, D. P. Marrone, V. McIntyre, J. J. McMahon, J. Mehl, S. S. Meyer, J. J. Mohr, T. E. Montroy, S. Padin, T. Plagge, C. Pryke, C. L. Reichardt, J. E. Ruhl, K. K. Schaffer, L. Shaw, E. Shirokoff, H. G. Spieler, B. Stalder, Z. Staniszewski, A. A. Stark, K. Vanderlinde, W. Walsh, R. Williamson, Y. Yang, O. Zahn, and A. Zenteno. 2010. "Extragalactic Millimeter-wave Sources in South Pole Telescope Survey Data: Source Counts, Catalog, and Statistics for an 87 Square-degree Field." ApJ, 719: 763.

    Crawford, T. M., E. R. Switzer, W. L. Holzapfel, et al. C. L. Reichardt, D. P. Marrone, and J. D. Vieira. 2010. "A Method for Individual Source Brightness Estimation in Single- and Multi-band Data." ApJ, 718: 513.

    McQuinn, M., and E. R. Switzer. 2009. "Redshifted intergalactic He+3 8.7 GHz hyperfine absorption." PRD, 80: 63010.

    Switzer, E. R., C. Allen, M. Amiri, et al. J. W. Appel, E. S. Battistelli, B. Burger, J. A. Chervenak, A. J. Dahlen, S. Das, M. J. Devlin, S. R. Dicker, W. B. Doriese, R. Dunner, T. Essinger-Hileman, X. Gao, M. Halpern, M. Hasselfield, G. C. Hilton, A. D. Hincks, K. D. Irwin, S. Knotek, R. P. Fisher, J. W. Fowler, N. Jarosik, M. Kaul, J. Klein, J. M. Lau, M. Limon, R. H. Lupton, T. A. Marriage, K. L. Martocci, S. H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. Page, L. P. Parker, B. A. Reid, C. D. Reintsema, A. J. Sederberg, J. L. Sievers, D. N. Spergel, S. T. Staggs, O. R. Stryzak, D. S. Swetz, R. J. Thornton, E. J. Wollack, and Y. Zhao. 2008. "Systems and control software for the Atacama Cosmology Telescope." Proc. SPIE, 7019: 85.

    Hirata, C. M., and E. R. Switzer. 2008. "Primordial helium recombination. II. Two-photon processes." PRD, 77: 83007.

    Switzer, E. R., and C. M. Hirata. 2008. "Primordial helium recombination. I. Feedback, line transfer, and continuum opacity." PRD, 77: 83006.

    Switzer, E. R., and C. M. Hirata. 2008. "Primordial helium recombination. III. Thomson scattering, isotope shifts, and cumulative results." PRD, 77: 83008.

    Niemack, M. D., Y. Zhao, E. Wollack, et al. R. Thornton, E. R. Switzer, D. S. Swetz, S. T. Staggs, L. Page, O. Stryzak, H. Moseley, T. A. Marriage, M. Limon, J. M. Lau, J. Klein, M. Kaul, N. Jarosik, K. D. Irwin, A. D. Hincks, G. C. Hilton, M. Halpern, J. W. Fowler, R. P. Fisher, R. Dünner, W. B. Doriese, S. R. Dicker, M. J. Devlin, J. Chervenak, B. Burger, E. S. Battistelli, J. Appel, M. Amiri, C. Allen, and A. M. Aboobaker. 2008. "A Kilopixel Array of TES Bolometers for ACT: Development, Testing, and First Light." Journal of Low Temperature Physics, 151: 690 [Full Text (Link)] [10.1007/s10909-008-9729-2]

    Switzer, E. R., and C. M. Hirata. 2005. "Ionizing radiation from hydrogen recombination strongly suppresses the lithium scattering signature in the CMB." PRD, 72: 83002.

    Abazajian, K., E. R. Switzer, S. Dodelson, K. Heitmann, and S. Habib. 2005. "Nonlinear cosmological matter power spectrum with massive neutrinos: The halo model." PRD, 71: 43507.

    Brief Bio

    Dr. Eric Switzer is an Astrophysicist in the Observational Cosmology Laboratory at the Goddard Space Flight Center in Greenbelt, Maryland. His research relates observations of diffuse cosmic background radiation to models of our universe at large. He joined the Goddard Space Flight Center (GSFC) in the summer of 2013, and is working with the PIPER collaboration.

    Prior to joining GSFC, Eric was a senior research associate at the Canadian Institute for Theoretical Astrophysics (CITA) and a Kavli Fellow at the Kavli Institute for Cosmological Physics (KICP).

    Selected Publications

    Refereed

    Switzer, E., P. Ade, C. Anderson, et al. E. Barrentine, N. Bellis, A. Bolatto, P. Breysse, B. Bulcha, G. Cataldo, J. Connors, P. Cursey, N. Ehsan, H. Grant, T. Essinger-Hileman, L. Hess, M. Kimball, A. Kogut, A. Lamb, L. Lowe, P. Mauskopf, J. McMahon, M. Mirzaei, S. Moseley, J. Mugge-Durum, O. Noroozian, U. Pen, A. Pullen, S. Rodriguez, P. Shirron, R. Somerville, T. Stevenson, C. Tucker, E. Visbal, C. Volpert, E. Wollack, and S. Yang. 2019. "The Experiment for Cryogenic Large-aperture Intensity Mapping (EXCLAIM)." JLTP (Accepted) arXiv:1912.07118

    Yang, S., A. R. Pullen, and E. R. Switzer. 2019. "Evidence for C II diffuse line emission at redshift z ̃ 2.6." Monthly Notices of the Royal Astronomical Society 489 (1): L53-L57 [10.1093/mnrasl/slz126]

    Switzer, E. R., P. Ade, T. Baildon, et al. D. Benford, C. Bennett, D. Chuss, R. Datta, J. Eimer, D. Fixsen, N. Gandilo, T. Essinger-Hileman, M. Halpern, G. Hilton, K. Irwin, C. Jhabvala, M. Kimball, A. Kogut, J. Lazear, L. Lowe, J. McMahon, T. Miller, P. Mirel, S. Moseley, S. Pawlyk, S. Rodriguez, E. Sharp, P. Shirron, J. Staguhn, D. Sullivan, P. Taraschi, C. Tucker, A. Walts, E. Wollack, and E. R. Switzer. 2019. "Sub-Kelvin cooling for two kilopixel bolometer arrays in the PIPER receiver." Review of Scientific Instruments 90 (9): 095104 [10.1063/1.5108649]

    Cataldo, G., E. M. Barrentine, B. T. Bulcha, et al. N. Ehsan, L. A. Hess, O. Noroozian, T. R. Stevenson, E. J. Wollack, S. H. Moseley, and E. R. Switzer. 2019. "Second-generation Micro-Spec: A compact spectrometer for far-infrared and submillimeter space missions." Acta Astronautica 162 155-159 [10.1016/j.actaastro.2019.06.012]

    Datta, R., S. Aiola, S. K. Choi, et al. M. Devlin, J. Dunkley, D. , P. A. Gallardo, M. Gralla, M. Halpern, M. Hasselfield, M. Hilton, A. D. Hincks, S.-P. P. Ho, J. Hubmayr, K. M. Huffenberger, J. P. Hughes, A. Kosowsky, C. H. L'opez-Caraballo, T. Louis, M. Lungu, T. Marriage, L. Maurin, J. McMahon, K. Moodley, S. K. Naess, F. Nati, M. D. Niemack, L. A. Page, B. Partridge, H. Prince, S. T. Staggs, E. R. Switzer, E. J. Wollack, and G. Farren. 2019. "The Atacama Cosmology Telescope: two-season ACTPol extragalactic point sources and their polarization properties." Monthly Notices of the Royal Astronomical Society 486 (4): 5239-5262 [10.1093/mnras/sty2934]

    Switzer, E. R., C. Anderson, A. Pullen, and S. Yang. 2019. "Intensity Mapping in the Presence of Foregrounds and Correlated Continuum Emission." The Astrophysical Journal 872 (1): 82 [10.3847/1538-4357/aaf9ab]

    Pawlyk, S., P. A. Ade, D. Benford, et al. C. L. Bennett, D. T. Chuss, R. Datta, J. L. Dotson, J. R. Eimer, D. J. Fixsen, N. N. Gand ilo, T. M. Essinger-Hileman, M. Halpern, G. Hilton, G. F. Hinshaw, K. Irwin, C. Jhabvala, M. Kimball, A. Kogut, L. Lowe, J. J. McMahon, T. M. Miller, P. Mirel, S. H. Moseley, S. Rodriguez, E. Sharp, P. Shirron, J. G. Staguhn, D. F. Sullivan, E. R. Switzer, P. Taraschi, C. E. Tucker, A. Walts, and E. J. Wollack. 2018. "The primordial inflation polarization explorer (PIPER): current status and performance of the first flight." SPIE 10708 1070806 [10.1117/12.2313874]

    Anderson, C., N. Luciw, Y.-C. Li, et al. C. Kuo, J. Yadav, K. Masui, T.-C. Chang, X. Chen, N. Oppermann, Y.-W. Liao, U.-L. Pen, D. Price, L. Staveley-Smith, E. Switzer, P. Timbie, and L. Wolz. 2018. "Low-amplitude clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities." Monthly Notices of the Royal Astronomical Society (Accepted) 476 (3): 3382-3392 [10.1093/mnras/sty346]

    Switzer, E. R. 2017. "Tracing the Cosmological Evolution of Stars and Cold Gas with CMB Spectral Surveys." The Astrophysical Journal 838 (2): 82 [10.3847/1538-4357/aa6576]

    Switzer, E. R., and D. J. Watts. 2016. "Robust likelihoods for inflationary gravitational waves from maps of cosmic microwave background polarization." Physical Review D 94 (6): 063526 [10.1103/PhysRevD.94.063526]

    Miller, N. J., D. T. Chuss, T. A. Marriage, et al. E. J. Wollack, J. W. Appel, C. L. Bennett, J. Eimer, T. Essinger-Hileman, D. J. Fixsen, K. Harrington, S. H. Moseley, K. Rostem, E. R. Switzer, and D. J. Watts. 2016. "Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators." The Astrophysical Journal 818 (2): 151 [10.3847/0004-637X/818/2/151]

    Switzer, E., T.-C. Chang, K. Masui, U.-L. Pen, and T. Voytek. 2015. "Interpreting the Unresolved Intensity of Cosmologically Redshifted Line Radiation." The Astrophysical Journal 815 51 [10.1088/0004-637X/815/1/51]

    Hand, N., A. Leauthaud, S. Das, et al. B. Sherwin, G. Addison, J. Bond, E. Calabrese, A. Charbonnier, M. Devlin, J. Dunkley, T. Erben, A. Hajian, M. Halpern, J. Harnois-D'eraps, C. Heymans, H. Hildebrandt, A. Hincks, J.-P. Kneib, A. Kosowsky, M. Makler, L. Miller, K. Moodley, B. Moraes, M. Niemack, L. Page, B. Partridge, N. Sehgal, H. Shan, J. Sievers, D. Spergel, S. Staggs, E. Switzer, J. Taylor, L. Van Waerbeke, C. Welker, and E. Wollack. 2015. "First measurement of the cross-correlation of CMB lensing and galaxy lensing." Physical Review D 91 (6): 062001 [10.1103/PhysRevD.91.062001]

    Switzer, E. R., and A. Liu. 2014. "Erasing the Variable: Empirical Foreground Discovery for Global 21 cm Spectrum Experiments." The Astrophysical Journal 793 (2): 102

    Lazear, J. S., P. Ade, D. J. Benford, et al. C. L. Bennett, D. T. Chuss, J. L. Dotson, J. R. Eimer, D. J. Fixsen, M. Halpern, G. Hilton, J. R. Hinderks, G. Hinshaw, K. Irwin, C. A. Jhabvala, B. Johnson, A. J. Kogut, L. N. Lowe, J. McMahon, T. M. Miller, P. Mirel, S. H. Moseley, S. Rodriguez, E. H. Sharp, J. G. Staguhn, E. R. Switzer, C. Tucker, A. Weston, and E. J. Wollack. 2014. "The Primordial Inflation Polarization Explorer (PIPER)." Proceedings of the SPIE 9153

    Masui, K. W., E. R. Switzer, N. Banavar, et al. K. Bandura, C. Blake, L. M. Calin, T. C. Chang, X. Chen, Y. C. Li, Y. W. Liao, A. Natarajan, U. L. Pen, J. B. Peterson, J. R. Shaw, and T. C. Voytek. 2013. "Measurement of 21 cm Brightness Fluctuations at z ~ 0.8 in Cross-correlation." ApJL 763 L20

    Switzer, E. R., K. W. Masui, K. Bandura, et al. L. M. Calin, T. C. Chang, X. L. Chen, Y. C. Li, Y. W. Liao, A. Natarajan, U. L. Pen, J. B. Peterson, J. R. Shaw, and T. C. Voytek. 2013. "Determination of z ~ 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation." MNRASL 434 L46

    Farhang, M., J. R. Bond, J. Chluba, and E. R. Switzer. 2013. "Constraints on Perturbations to the Recombination History from Measurements of the Cosmic Microwave Background Damping Tail." ApJ 764 137

    Calabrese, E., R. A. Hlozek, N. Battaglia, et al. E. S. Battistelli, J. R. Bond, J. Chluba, D. Crichton, S. Das, M. J. Devlin, J. Dunkley, R. Dunner, M. Farhang, M. B. Gralla, A. Hajian, M. Halpern, M. Hasselfield, A. D. Hincks, K. D. Irwin, A. Kosowsky, T. Louis, T. A. Marriage, K. Moodley, L. Newburgh, M. D. Niemack, M. R. Nolta, L. A. Page, N. Sehgal, B. D. Sherwin, J. L. Sievers, C. Sifon, D. N. Spergel, S. T. Staggs, E. R. Switzer, and E. J. Wollack. 2013. "Cosmological parameters from pre-planck cosmic microwave background measurements." PRD 87 103012

    Chluba, J., E. Switzer, K. Nelson, and D. Nagai. 2013. "Sunyaev-Zeldovich signal processing and temperature-velocity moment method for individual clusters." MNRAS 430 3054

    Dunner, R., M. Hasselfield, T. A. Marriage, et al. J. Sievers, V. Acquaviva, G. E. Addison, P. Ade, P. Aguirre, M. Amiri, J. W. Appel, L. F. Barrientos, E. S. Battistelli, J. R. Bond, B. Brown, B. Burger, E. Calabrese, J. Chervenak, S. Das, M. J. Devlin, S. R. Dicker, W. Bertrand Doriese, J. Dunkley, T. Essinger-Hileman, R. P. Fisher, M. B. Gralla, J. W. Fowler, A. Hajian, M. Halpern, C. Hernandez-Monteagudo, G. C. Hilton, M. Hilton, A. D. Hincks, R. Hlozek, K. M. Huffenberger, D. H. Hughes, J. P. Hughes, L. Infante, K. D. Irwin, J. Baptiste Juin, M. Kaul, J. Klein, A. Kosowsky, J. M. Lau, M. Limon, Y. Lin, T. Louis, R. H. Lupton, D. Marsden, K. Martocci, P. Mauskopf, F. Menanteau, K. Moodley, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, B. Partridge, H. Quintana, B. Reid, N. Sehgal, B. D. Sherwin, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, H. Trac, C. Tucker, R. Warne, G. Wilson, E. Wollack, and Y. Zhao. 2013. "The Atacama Cosmology Telescope: Data Characterization and Mapmaking." ApJ 762 10

    Hand, N., G. E. Addison, E. Aubourg, et al. N. Battaglia, E. S. Battistelli, D. Bizyaev, J. R. Bond, H. Brewington, J. Brinkmann, B. R. Brown, S. Das, K. S. Dawson, M. J. Devlin, J. Dunkley, R. Dunner, D. J. Eisenstein, J. W. Fowler, M. B. Gralla, A. Hajian, M. Halpern, M. Hilton, A. D. Hincks, R. Hlozek, J. P. Hughes, L. Infante, K. D. Irwin, A. Kosowsky, Y. Lin, E. Malanushenko, V. Malanushenko, T. A. Marriage, D. Marsden, F. Menanteau, K. Moodley, M. D. Niemack, M. R. Nolta, D. Oravetz, L. A. Page, N. Palanque-Delabrouille, K. Pan, E. D. Reese, D. J. Schlegel, D. P. Schneider, N. Sehgal, A. Shelden, J. Sievers, C. Sifon, A. Simmons, S. Snedden, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, H. Trac, B. A. Weaver, E. J. Wollack, C. Yeche, and C. Zunckel. 2012. "Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect." PRL 109 41101

    Dunkley, J., R. Hlozek, J. Sievers, et al. V. Acquaviva, P. Ade, P. Aguirre, M. Amiri, J. W. Appel, L. F. Barrientos, E. S. Battistelli, J. R. Bond, B. Brown, B. Burger, J. Chervenak, S. Das, M. J. Devlin, S. R. Dicker, W. Bertrand Doriese, R. Dunner, T. Essinger-Hileman, R. P. Fisher, J. W. Fowler, A. Hajian, M. Halpern, M. Hasselfield, C. Hernandez-Monteagudo, G. C. Hilton, M. Hilton, A. D. Hincks, K. M. Huffenberger, D. H. Hughes, J. P. Hughes, L. Infante, K. D. Irwin, J. B. Juin, M. Kaul, J. Klein, A. Kosowsky, J. M. Lau, M. Limon, Y. T. Lin, R. H. Lupton, T. A. Marriage, D. Marsden, P. Mauskopf, F. Menanteau, K. Moodley, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, B. Partridge, B. Reid, N. Sehgal, B. Sherwin, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, H. Trac, C. Tucker, R. Warne, E. Wollack, and Y. Zhao. 2011. "The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectrum." ApJ 739 52

    Sherwin, B. D., J. Dunkley, S. Das, et al. J. W. Appel, J. R. Bond, C. S. Carvalho, M. J. Devlin, R. Dunner, T. Essinger-Hileman, J. W. Fowler, A. Hajian, M. Halpern, M. Hasselfield, A. D. Hincks, R. Hlozek, J. P. Hughes, K. D. Irwin, J. Klein, A. Kosowsky, T. A. Marriage, D. Marsden, K. Moodley, F. Menanteau, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, E. D. Reese, B. L. Schmitt, N. Sehgal, J. Sievers, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, K. Visnjic, and E. Wollack. 2011. "Evidence for Dark Energy from the Cosmic Microwave Background Alone Using the Atacama Cosmology Telescope Lensing Measurements." PRL 107 21302

    Swetz, D. S., P. Ade, M. Amiri, et al. J. W. Appel, E. S. Battistelli, B. Burger, J. Chervenak, M. J. Devlin, S. R. Dicker, W. B. Doriese, R. Dunner, T. Essinger-Hileman, R. P. Fisher, J. W. Fowler, M. Halpern, M. Hasselfield, G. C. Hilton, A. D. Hincks, K. D. Irwin, N. Jarosik, M. Kaul, J. Klein, J. M. Lau, M. Limon, T. A. Marriage, D. Marsden, K. Martocci, P. Mauskopf, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, S. T. Staggs, O. Stryzak, E. R. Switzer, R. Thornton, C. Tucker, E. Wollack, and Y. Zhao. 2011. "Overview of the Atacama Cosmology Telescope: Receiver, Instrumentation, and Telescope Systems." ApJS 194 41

    Abbot, D. S., and E. R. Switzer. 2011. "The Steppenwolf: A Proposal for a Habitable Planet in Interstellar Space." ApJL 735 L27

    Vieira, J. D., T. M. Crawford, E. R. Switzer, et al. P. Ade, K. A. Aird, M. Ashby, B. A. Benson, L. E. Bleem, M. Brodwin, J. E. Carlstrom, C. L. Chang, H. M. Cho, A. T. Crites, T. de Haan, M. A. Dobbs, W. Everett, E. M. George, M. Gladders, N. R. Hall, N. W. Halverson, F. W. High, G. P. Holder, W. L. Holzapfel, J. D. Hrubes, M. Joy, R. Keisler, L. Knox, A. T. Lee, E. M. Leitch, M. Lueker, D. P. Marrone, V. McIntyre, J. J. McMahon, J. Mehl, S. S. Meyer, J. J. Mohr, T. E. Montroy, S. Padin, T. Plagge, C. Pryke, C. L. Reichardt, J. E. Ruhl, K. K. Schaffer, L. Shaw, E. Shirokoff, H. G. Spieler, B. Stalder, Z. Staniszewski, A. A. Stark, K. Vanderlinde, W. Walsh, R. Williamson, Y. Yang, O. Zahn, and A. Zenteno. 2010. "Extragalactic Millimeter-wave Sources in South Pole Telescope Survey Data: Source Counts, Catalog, and Statistics for an 87 Square-degree Field." ApJ 719 763

    Crawford, T. M., E. R. Switzer, W. L. Holzapfel, et al. C. L. Reichardt, D. P. Marrone, and J. D. Vieira. 2010. "A Method for Individual Source Brightness Estimation in Single- and Multi-band Data." ApJ 718 513

    McQuinn, M., and E. R. Switzer. 2009. "Redshifted intergalactic He+3 8.7 GHz hyperfine absorption." PRD 80 63010

    Switzer, E. R., C. Allen, M. Amiri, et al. J. W. Appel, E. S. Battistelli, B. Burger, J. A. Chervenak, A. J. Dahlen, S. Das, M. J. Devlin, S. R. Dicker, W. B. Doriese, R. Dunner, T. Essinger-Hileman, X. Gao, M. Halpern, M. Hasselfield, G. C. Hilton, A. D. Hincks, K. D. Irwin, S. Knotek, R. P. Fisher, J. W. Fowler, N. Jarosik, M. Kaul, J. Klein, J. M. Lau, M. Limon, R. H. Lupton, T. A. Marriage, K. L. Martocci, S. H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. Page, L. P. Parker, B. A. Reid, C. D. Reintsema, A. J. Sederberg, J. L. Sievers, D. N. Spergel, S. T. Staggs, O. R. Stryzak, D. S. Swetz, R. J. Thornton, E. J. Wollack, and Y. Zhao. 2008. "Systems and control software for the Atacama Cosmology Telescope." Proc. SPIE 7019 85

    Hirata, C. M., and E. R. Switzer. 2008. "Primordial helium recombination. II. Two-photon processes." PRD 77 83007

    Switzer, E. R., and C. M. Hirata. 2008. "Primordial helium recombination. I. Feedback, line transfer, and continuum opacity." PRD 77 83006

    Switzer, E. R., and C. M. Hirata. 2008. "Primordial helium recombination. III. Thomson scattering, isotope shifts, and cumulative results." PRD 77 83008

    Niemack, M. D., Y. Zhao, E. Wollack, et al. R. Thornton, E. R. Switzer, D. S. Swetz, S. T. Staggs, L. Page, O. Stryzak, H. Moseley, T. A. Marriage, M. Limon, J. M. Lau, J. Klein, M. Kaul, N. Jarosik, K. D. Irwin, A. D. Hincks, G. C. Hilton, M. Halpern, J. W. Fowler, R. P. Fisher, R. Dünner, W. B. Doriese, S. R. Dicker, M. J. Devlin, J. Chervenak, B. Burger, E. S. Battistelli, J. Appel, M. Amiri, C. Allen, and A. M. Aboobaker. 2008. "A Kilopixel Array of TES Bolometers for ACT: Development, Testing, and First Light." Journal of Low Temperature Physics 151 690 [Full Text (Link)] [10.1007/s10909-008-9729-2]

    Switzer, E. R., and C. M. Hirata. 2005. "Ionizing radiation from hydrogen recombination strongly suppresses the lithium scattering signature in the CMB." PRD 72 83002

    Abazajian, K., E. R. Switzer, S. Dodelson, K. Heitmann, and S. Habib. 2005. "Nonlinear cosmological matter power spectrum with massive neutrinos: The halo model." PRD 71 43507

                                                                                                                                                                                            
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