Present PositionResearch Scientist (Astrophysics) at Johns Hopkins University and NASA/GSFCBrief BioFrom October 1992 to September 2000 he worked at the Laboratory of High Energy Astrophysics (now the EUD) at NASA/Goddard Space Flight Center. There, he worked with Dr. Peter Serlemitsos on analysis and modeling of X-ray data from the ASCA satellite, as a member of the ASCA mirror (XRT) team. From October 1995 he was also a member of the staff of the ASCA Guest Observer Facility (GOF), participating in technical, calibration, and user-support work. Since October 2000, Dr. Yaqoob has been with the Center for Astrophysical Sciences (CAS) at the Johns Hopkins University (JHU), and is the coordinator of a Cooperative Agreement program between JHU/CAS and GSFC/EUD. As part of this program, he chaired the committee which organized an international workship entitled "X-ray emission from Accretion onto Black Holes", held at JHU in June 2001. His research is currently supported by a number of NASA grants.Educational BackgroundTahir Yaqoob obtained a B.A. (Hons) in Physics at the University of Oxford, UK, in 1986, and a PhD in X-ray Astronomy at the University of Leicester, UK, in 1990. He subsequently continued his research in X-ray astronomy at the Institute of Space and Astronautical Science (ISAS), Japan, on a Royal Society/JSPS Fellowship, and then at the Institute of Astronomy, Cambridge, UK, on a Royal Society Fellowship.Research InterestsTahir's research interests focus on diagnosing the physical properties of astrophysical sources using observations at high-energy (i.e. anything above the Lyman limit), primarily of active galaxies (AGN). He has experience in analyzing data from the EXOSAT, Ginga, BBXRT, ASCA, Chandra, and XMM satellites. His research activity and interests also include theoretical modelling of hte physical processes in astrophysical sources, again primarily AGN, using numerical FORTRAN and IDL codes written by himself. Of particular interest is the diagnoses of accreting black-hole systems using observational and theoretical tools. This involves probing the X-ray emission mechanisms, structure, geometry, and physical state of matter close to the X-ray source, in particular using the iron-K emission line, thus deducing implications for the putative accretion disk and black hole.Current ProjectsSuzaku Science Working Group MemberPrincipal Investigator of Cooperative Agreement between JHU/GSFC Various ASCA, RXTE, Chandra, & XMM projects X-ray Spectroscopy modeling of Black Hole Systems in AGN Selected Publications84 refereed publications, 25 first author.O VII and O VIII Absorption by Hot Gas in the Vicinity of the Galaxy McKernan, B.; Yaqoob, T.; & Reynolds, C.S. 2004, ApJ, 617, 232. Iron K Features in the Quasar E 1821+643: Evidence for Gravitational Redshifted Absorption? Tahir Yaqoob & Peter Serlemitsos 2005, ApJ, 623, 112. An Extended Scheme for Fitting X-ray Data with Accretion Disk Spectra in the Strong Gravity Regime Dovciak, M.; Karas, V.; & Yaqoob, T. 2004, ApJ, 153, 205. The Cores of the Fe K Lines in Seyfert I Galaxies Observed by the Chandra High Energy Grating Tahir Yaqoob & Urmila Padmanabhan 2004, ApJ, 604, 63 Fe XXV and Fe XXVI Diagnostics of the Black Hole & Accretion Disk in Active Galaxies: Chandra Time-Resolved Grating Spectroscopy of NGC 7314 Yaqoob, T.; George, I.M.; Kallman, T.; Padmanabhan, U.; Weaver, K.A.; & Turner, T.J. 2003, ApJ, 596, 85. The Kinematics and Physical Conditions of the Ionized Gas in Markarian 509. I. Chandra High Energy Grating Spectroscopy Yaqoob, T.; McKernan, B.; Kraemer, S.; Crenshaw, D.; Gabel, J.; George, I.; & Turner, J. 2003, ApJ, 582, 105. Publications at the ADS website.
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