Timothy R Kallman
(Research Scientist)
| Email: | timothy.r.kallman@nasa.gov |
| Org Code: | |
| Address: |
NASA/GSFC Mail Code 662 Greenbelt, MD 20771 |
| Employer: | UNIVERSITY OF MARYLAND AT COLLEGE PARK |
Brief Bio
My science interests include X-ray astronomy, theoretical astrophysics, atomic physics and plasma modeling. I received my PhD from University of Colorado Boulder, working with Prof. Dick McCray; I did a postdoc at MIT working with Prof. Claude Canizares. I now work at NASA/Goddard Space Flight Center in the X-ray Astrophysics Lab.
https://orcid.org/0000-0002-5779-6906
Professional Societies
American Astronomical Society
2019 - Present
Publications
Refereed
2019. "Astro2020 Science White Paper: Using X-Ray Polarimetry to Probe the Physics of Black Holes and Neutron Stars.", arXiv e-prints, arXiv:1904.09313 [Proceedings]
2016. "The Polarimeter for Relativistic Astrophysical X-ray Sources.", Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, [10.1117/12.2234220] [Proceedings]
2013. "On the Statistical Analysis of X-ray Polarization Measurements.", The Astrophysical Journal, 772 (2): 103--112 [10.1088/0004-637X/773/2/103] [Journal Article/Letter]
2010. "The Challenges of Plasma Modeling: Current Status and Future Plans.", Space Science Reviews, Online First, 149 [Full Text] [10.1007/s11214-010-9732-1] [Journal Article/Letter]
2010. "Modeling of Photoionized Plasmas.", Space Science Reviews, Online First, 128 [Full Text] [10.1007/s11214-010-9711-6] [Journal Article/Letter]
2010. "On the Properties of Thermal Disk Winds in X-ray Transient Sources: A Case Study of GRO J1655-40.", The Astrophysical Journal, 719 515 [Full Text] [10.1088/0004-637X/719/1/515] [Journal Article/Letter]
2010. "X-ray Reflected Spectra from Accretion Disk Models I Constant Density Atmospheres.", The Astrophysical Journal, 718 695 [Full Text] [10.1088/0004-637X/718/2/695] [Journal Article/Letter]
2010. "A Chandra Survey of Fluorescence Fe Lines in X-ray Binaries at High Resolution.", The Astrophysical Journal, 715 947 [Full Text] [10.1088/0004-637X/715/2/947] [Journal Article/Letter]
2010. "Active Galaxy Unification in the Era of X-Ray Polarimetry.", The Astrophysical Journal Letters, 711 L112 [Full Text] [10.1088/2041-8205/711/2/L112] [Journal Article/Letter]
2010. "The First Detection of [O IV] from an Ultraluminous X-ray Source with Spitzer II Evidence for High Luminosity in Holmberg II ULX.", The Astrophysical Journal, 708 364 [Full Text] [10.1088/0004-637X/708/1/364] [Journal Article/Letter]
2010. "The First Detection of [O IV] from an Ultraluminous X-Ray Source with Spitzer I Observational Results for Holmberg II ULX.", The Astrophysical Journal, 708 354 [Full Text] [10.1088/0004-637X/708/1/354] [Journal Article/Letter]
2009. "Accretion disk dynamics, photoionized plasmas, and stellar opacities.", Physics of Plasmas, 16 1001 [Full Text] [10.1063/1.3101819] [Journal Article/Letter]
2009. "K-Shell Photoionization and Photoabsorption of Ne, Mg, Si, S, Ar, and Ca.", The Astrophysical Journal Supplement, 182 127 [Full Text] [10.1088/0067-0049/182/1/127] [Journal Article/Letter]
2009. "The Photoionized Accretion Disk in Her X-1.", The Astrophysical Journal, 700 977 [Full Text] [10.1088/0004-637X/700/2/977] [Journal Article/Letter]
2009. "Spectrum Synthesis Modeling of the X-Ray Spectrum of GRO J1655-40 Taken During the 2005 Outburst.", The Astrophysical Journal, 701 865 [Full Text] [10.1088/0004-637X/701/2/865] [Journal Article/Letter]
2009. "Nitrogen K-Shell Photoabsorption.", The Astrophysical Journal Supplement, 185 477 [Full Text] [10.1088/0067-0049/185/2/477] [Journal Article/Letter]
2009. "Suzaku Observations of Four Heavily Absorbed HMXBs.", The Astrophysical Journal, 699 892 [Full Text] [10.1088/0004-637X/699/1/892] [Journal Article/Letter]
2009. "An Axisymmetric Hydrodynamical Model for the Torus Wind in Active Galactic Nucleus III Spectra from Three-Dimensional Radiation Transfer Calculations.", The Astrophysical Journal, 703 1797 [Full Text] [10.1088/0004-637X/703/2/1797] [Journal Article/Letter]
2008. "The Symbiotic System SS73 17 Seen with Suzaku.", Publications of the Astronomical Society of Japan, Vol60, NoSP1, ppS43--S48, 60 43 [Full Text] [Journal Article/Letter]
2008. "Micro-X: Mission Overview and Science Goals.", Journal of Low Temperature Physics, 151 740 [Full Text] [10.1007/s10909-008-9732-7] [Journal Article/Letter]
2008. "Constraints on the Velocity and Spatial Distribution of Helium-like Ions in the Wind of SMC X-1 from Observations with the XMM-Newton Reflection Grating Spectrometer.", The Astrophysical Journal, 673 1023 [Full Text] [10.1086/524884] [Journal Article/Letter]
2008. "An Axisymmetric, Hydrodynamical Model for the Torus Wind in Active Galactic Nuclei.", The Astrophysical Journal, 675 L5 [Full Text] [10.1086/529374] [Journal Article/Letter]
2008. "The Accretion Disk Wind in the Black Hole GRO J1655-40.", The Astrophysical Journal, 680 1359 [Full Text] [10.1086/588521] [Journal Article/Letter]
2008. "Radiative and Auger Decay of K-Vacancy Levels in the Ne, Mg, Si, S, Ar, and Ca Isonuclear Sequences.", The Astrophysical Journal Supplement Series, 177 408 [Full Text] [10.1086/587804] [Journal Article/Letter]
2008. "An Axisymmetric, Hydrodynamical Model for the Torus Wind in Active Galactic Nuclei II X-Ray-Excited Funnel Flow.", The Astrophysical Journal, 687 97 [Full Text] [10.1086/591418] [Journal Article/Letter]
2008. "Radiative and Auger Decay Data for Modeling Nickel K Lines.", The Astrophysical Journal Supplement Series, 179 542 [Full Text] [10.1086/591965] [Journal Article/Letter]
2007. "The Abundances of Light Neutron-Capture Elements in Planetary Nebulae I Photoionization Modeling and Ionization Corrections.", The Astrophysical Journal Supplement Series, 169 37 [Full Text] [10.1086/511031] [Journal Article/Letter]
2007. "Atomic data for x-ray astrophysics.", Reviews of Modern Physics, vol 79, Issue 1, pp 79-133, 79 79 [Full Text] [10.1103/RevModPhys.79.79] [Journal Article/Letter]
2006. "A new interpretation of the remarkable X-ray spectrum of the symbiotic star CH Cyg.", Monthly Notices of the Royal Astronomical Society, 372 1602 [Full Text] [10.1111/j.1365-2966.2006.10959.x] [Journal Article/Letter]
2005. "Far-Ultraviolet Spectroscopy of the Dwarf Novae SS Cygni and WX Hydri in Quiescence.", The Astrophysical Journal, 630 511 [Full Text] [10.1086/432088] [Journal Article/Letter]
2005. "Line Asymmetry in the Seyfert Galaxy NGC 3783.", The Astrophysical Journal, 627 166 [Full Text] [10.1086/430202] [Journal Article/Letter]
2005. "K-Shell Photoabsorption of Oxygen Ions.", The Astrophysical Journal Supplement Series, 158 68 [Full Text] [10.1086/428712] [Journal Article/Letter]
2005. "Detectability of Gamma-Ray Burst Iron Lines by Swift, Chandra, and XMM-Newton.", The Astrophysical Journal, 624 889 [Full Text] [10.1086/428893] [Journal Article/Letter]
2004. "Origin of the Soft Excess in X-Ray Pulsars.", The Astrophysical Journal, 614 881 [Full Text] [10.1086/423928] [Journal Article/Letter]
2004. "Astrophysical motivation for X-ray polarimetry.", Advances in Space Research, 34 2673 [Full Text] [10.1016/j.asr.2003.03.059] [Journal Article/Letter]
2004. "Decay properties of K-vacancy states in Fe X-Fe XVII.", Astronomy and Astrophysics, v414, p377-388 (2004), 414 377 [Full Text] [10.1051/0004-6361:20031621] [Journal Article/Letter]
2004. "K-shell photoionization and electron impact excitation of Fe XVII-Fe XXIII.", Astronomy and Astrophysics, v418, p1171-1178 (2004), 418 1171 [Full Text] [10.1051/0004-6361:20034198] [Journal Article/Letter]
2004. "Dynamics of Line-driven Disk Winds in Active Galactic Nuclei II Effects of Disk Radiation.", The Astrophysical Journal, 616 688 [Full Text] [10.1086/425117] [Journal Article/Letter]
2004. "Photoionization Modeling and the K Lines of Iron.", The Astrophysical Journal Supplement Series, 155 675 [Full Text] [10.1086/424039] [Journal Article/Letter]
2004. "Fe II Diagnostic Tools for Quasars.", The Astrophysical Journal, 611 780 [Full Text] [10.1086/422303] [Journal Article/Letter]
2003. "Modeling of iron K lines: Radiative and Auger decay data for Fe II-Fe IX.", Astronomy and Astrophysics, v410, p359-364 (2003), 410 359 [Full Text] [10.1051/0004-6361:20031262] [Journal Article/Letter]
2003. "Simultaneous ASCA and Hubble Space Telescope/GHRS Observations of Cygnus X-2/V1341 Cygni.", The Publications of the Astronomical Society of the Pacific, 115 1124 [Full Text] [10.1086/377089] [Journal Article/Letter]
2003. "Iron K Lines from Gamma-Ray Bursts.", The Astrophysical Journal, 593 946 [Full Text] [10.1086/376676] [Journal Article/Letter]
2003. "Chandra Grating Spectroscopy of the X-Ray Binary 4U 1700-37 in a Flaring State.", The Astrophysical Journal, 592 516 [Full Text] [10.1086/375636] [Journal Article/Letter]
2003. "A complete set of radiative and Auger rates for K-vacancy states in Fe XVIII-Fe XXV.", Astronomy and Astrophysics, v403, p1175-1184 (2003), 403 1175 [Full Text] [10.1051/0004-6361:20030405] [Journal Article/Letter]
2003. "Atomic data for the K-vacancy states of Fe XXIV.", Astronomy and Astrophysics, v403, p339-355 (2003), 403 339 [Full Text] [10.1051/0004-6361:20030367] [Journal Article/Letter]
2003. "Chandra and XMM Observations of the Accretion Disk Corona Source 2S 0921-63.", The Astrophysical Journal, 583 861 [Full Text] [10.1086/345475] [Journal Article/Letter]
2003. "Hydrodynamic Models of Line-driven Accretion Disk Winds III Local Ionization Equilibrium.", The Astrophysical Journal, 582 984 [Full Text] [10.1086/344747] [Journal Article/Letter]
2003. "Fe XXV and Fe XXVI Diagnostics of the Black Hole and Accretion Disk in Active Galaxies: Chandra Time-resolved Grating Spectroscopy of NGC 7314.", The Astrophysical Journal, 596 85 [Full Text] [10.1086/377687] [Journal Article/Letter]
2002. "On the Role of the Ultraviolet and X-Ray Radiation in Driving a Disk Wind in X-Ray Binaries.", The Astrophysical Journal, 565 455 [Full Text] [10.1086/324534] [Journal Article/Letter]
2002. "On the Structure of the Iron K Edge.", The Astrophysical Journal, 577 L119 [Full Text] [10.1086/344243] [Journal Article/Letter]
2002. "Resonance Line Profile Calculations Based on Hydrodynamical Models of Cataclysmic Variable Winds.", The Astrophysical Journal, 572 382 [Full Text] [10.1086/340339] [Journal Article/Letter]
2001. "Simultaneous Chandra and Hubble Space Telescope Observations of SMC X-1.", The Astrophysical Journal, 563 L139 [Full Text] [10.1086/338733] [Journal Article/Letter]
2001. "Line-driven disk winds in active galactic nuclei.", Advances in Space Research, 28 459 [Full Text] [10.1016/S0273-1177(01)00441-0] [Journal Article/Letter]
2001. "Accretion Disk Models and Their X-Ray Reflection Signatures I Local Spectra.", The Astrophysical Journal, 546 406 [Full Text] [10.1086/318250] [Journal Article/Letter]
2001. "Photoionization and High-Density Gas.", The Astrophysical Journal Supplement Series, 133 221 [Full Text] [10.1086/319184] [Journal Article/Letter]
2001. "Testing Hydrodynamic Models of LMC X-4 with Ultraviolet and X-Ray Spectra.", The Astrophysical Journal, 550 919 [Full Text] [10.1086/319773] [Journal Article/Letter]
2001. "The XSTAR Atomic Database.", The Astrophysical Journal Supplement Series, 134 139 [Full Text] [10.1086/320363] [Journal Article/Letter]
2001. "Hot Outflowing Gas from the X-Ray Binary Hercules X-1.", The Astrophysical Journal, 562 925 [Full Text] [10.1086/323850] [Journal Article/Letter]
2000. "Discovery of Millihertz ULTRAVIOLET Quasi-periodic Oscillations in Hercules X-1.", The Astrophysical Journal, 545 399 [Full Text] [10.1086/317786] [Journal Article/Letter]
2000. "Recombination Spectra of Helium-like Ions.", The Astrophysical Journal, 544 581 [Full Text] [10.1086/317206] [Journal Article/Letter]
2000. "Dynamics of Line-driven Disk Winds in Active Galactic Nuclei.", The Astrophysical Journal, 543 686 [Full Text] [10.1086/317154] [Journal Article/Letter]
2000. "An X-Ray Spectroscopic Study of the SMC X-1/SK 160 System.", The Astrophysical Journal, 541 963 [Full Text] [10.1086/309455] [Journal Article/Letter]
2000. "Early X-Ray/Ultraviolet Line Signatures of Gamma-Ray Burst Progenitors and Hypernovae.", The Astrophysical Journal, 534 581 [Full Text] [10.1086/308792] [Journal Article/Letter]
2000. "Hydrodynamic Models of Line-driven Accretion Disk Winds II Adiabatic Winds from Nonisothermal Disks.", The Astrophysical Journal, 532 563 [Full Text] [10.1086/308527] [Journal Article/Letter]
2000. "Hercules X-1: Empirical Models of Ultraviolet Emission Lines.", The Astrophysical Journal, 529 414 [Full Text] [10.1086/308272] [Journal Article/Letter]
2000. "Thermal Instability and Photoionized X-Ray Reflection in Accretion Disks.", The Astrophysical Journal, 537 833 [Full Text] [10.1086/309054] [Journal Article/Letter]
1997. "The Discovery of 13 Second X-Ray Pulsations from the Hydrogen-depleted Subdwarf O6 Star Binary HD 49798.", ApJ, 474 L53. [Journal Article/Letter]
1995. "Neon Line Emission in the X-Ray Spectrum of the Pulsar 4U 1626-67.", ApJ Letters, 449 41. [Journal Article/Letter]
1989. "Iron K lines from low-mass X-ray binaries.", Ap.J., 341 955 [Journal Article/Letter]
1989. "An EXOSAT X-ray Observation of one orbital cycle of 4U1700-37/HD 153919.", ApJ, 343 409 [Journal Article/Letter]