(Associate Lab Chief)
| Email: | timothy.r.kallman@nasa.gov |
| Phone: | 301.286.3680 |
| Org Code: | 662 |
| Address: |
NASA/GSFC Mail Code 662 Greenbelt, MD 20771 |
| Employer: |
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
2019 - Present
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]