Publications in Refereed Journals

Refereed Publications (Tahir Yaqoob)

81: Iron K Features in the Quasar E 1821+643: Evidence for Gravitationally Redshifted Absorption: Tahir Yaqoob & Peter Serlemitsos 2004, ApJ, submitted
1: The X-ray Spectrum of QSO 1821+643: Warwick, R. S., Barstow, M. A. & Yaqoob, T.,; 1989, MNRAS, 238, 917
2: A GINGA Observation of NGC 4151: Warwick, R. S., Yaqoob, T., Pounds, K. A., Matsuoka, M. & Yamauchi, M.,; 1989, PASJ, 41, 721
3: Variable X-ray Absorption in NGC 4151: Yaqoob, T., Warwick, R. S. & Pounds, K. A.,; 1989, MNRAS, 236, 153
4: A Search for Reflection Features in the X-ray Spectrum of NGC 4151: Maisack, M. & Yaqoob, T.,; 1991, A&A, 249, 25
5: The X-ray Spectral Variability of NGC 4151: Yaqoob, T. & Warwick, R. S.,; 1991, MNRAS, 248, 773
6: Nonthermal Pair Models of the Spectral Index Variability in NGC 4151: Yaqoob, T.,; 1992, MNRAS, 258, 198
7: The X-ray Properties of Active Galaxies with High Intrinsic Absorption: Warwick, R. S., Sembay, S., Yaqoob, T., Makishima, K., Ohashi, T. & Tashiro, M.,; 1993, MNRAS, 265, 412
8: Is X1957+11 a Black Hole Candidate?: Yaqoob, T., Ebisawa, K. & Mitsuda, K.,; 1993, MNRAS, 264, 411
9: The Fe K Line As A Probe Of Beamed X-ray Emission In AGN: Yaqoob, T., McKernan, B., Done, C., Serlemitsos, P. J. & Weaver, K. A.,; 1993, ApJ, 416, L5
10: A BBXRT Observation of the High Luminosity Quasar H1821+643: Yaqoob, T., Serlemitsos, P. J., Mushotzky, R. F., Weaver, K. A., & Marshall, F. E., Petre R.,; 1993, ApJ, 418, 638
11: Further Probing of the X-ray Source in NGC 4151: New Constraints on the Nuclear Geometry: Yaqoob, T., Warwick, R. S., Makino, F., Otani, C., Sokoloski, J. L., Bond, I. A. & Yamauchi, M.,; 1993, MNRAS, 262, 435
12: Low State Properties of the Low Mass X-ray Binary X1608-522 Observed with Ginga: Yoshida, K., Mitsuda, K., Ebisawa, K., Ueda, Y., Fujimoto, R., Yaqoob, T. & Done, C.,; 1993, PASJ, 45, 605
13: ASCA Observation of the Warm Absorber in MCG -6-30-15; the Discovery of a Change in Column Density: Fabian, A. C., Inoue, H., Kunieda, H., Matsuoka, M., Mihara, T., Miyamoto, S., Otani, C., Ricker, G., Tanaka, Y., Yamauchi, M. & Yaqoob, T.,; 1994, PASJ, 46, L59
14: An ASCA Observation of the Seyfert 2 Galaxy Markarian 3: Iwasawa, K., Yaqoob, T., Awaki, H. & Ogasaka, Y.,; 1994, PASJ, 46, L167
15: Discovery of an Obscured Low Luminosity Active Nucleus in the Spiral Galaxy NGC 4258: Makishima, K., Serlemitsos, P. J., Tashiro, M., Fujimoto, R., Ishisaki, Y., Kii, T., Lowenstein, M., Mushotzky, R., Sonobe, T. & Yaqoob, T.,; 1994, PASJ, 46, L77
16: Rapid X-ray Spectral Variability in NGC 3227: Ptak, A., Yaqoob, T., Serlemitsos, P. J., Mushotzky, R. F. & Otani, C.,; 1994, ApJ, 436, L31
17: The Complex X-ray Spectra of Two High Redshift Quasars Observed with ASCA: Serlemitsos, P. J., Yaqoob, T., Ricker, G., Woo, J., Kunieda, H., Terashima, Y., & Iwasawa, K.,; 1994, PASJ, 46, L43
18: New X-ray Spectral Observations of NGC 4151 with ASCA: Weaver, K. A., Holt, S. S., Yaqoob, T., Mushotzky, R. F., Matsuoka, M. & Yamauchi, M.,; 1994, ApJ, L27
19: An ASCA Observation of One Orbital Cycle of AR Lac: White, N., Arnaud, K., Day, C. S. R., Ebisawa, K., Gotthelf, E. V., Mukai, K., Soong, Y., Yaqoob, T. & Antunes, A.,; 1994, PASJ, 46, L97
20: X-ray Spectrum and Variability of the Quasar PG 1211+143: Yaqoob, T., Serlemitsos, P. J., Mushotzky, R. F., Madejski, G., Turner, T. J. & Kunieda, H.,; 1994, PASJ, 46, L173
21: The X-ray Emission of 3C 273 Observed with ASCA: Yaqoob, T., Serlemitsos, P. J., Mushotzky, R. F., Ricker, G., Woo, J., Weaver, K., Kii, T., Mitsuda, K., Kotani, T., Hayashida, K., Murakami, S. & Tashiro, M.,; 1994, PASJ, 46, L49
22: The Hard X-ray Emission of NGC 3628 and the Contribution of Low-Luminosity Spiral Galaxies to the Cosmic X-ray Background: Yaqoob, T., Serlemitsos, P. J., Ptak, A., Mushotzky, R. F., Kunieda, H., & Terashima, Y.,; 1995, ApJ, 455, 508
23: An ASCA X-ray Spectrum of a Prototype Bare Seyfert 1 Nucleus in MCG-2-58-22: Weaver, K. A., Nousek, J., Yaqoob, T., Hayashida, K., & Murakami, S.,; 1995, ApJ, 451, 147
24: X-ray Reprocessing By a Molecular Torus in the Seyfert 1.9 Galaxy NGC 2992: Weaver, K. A., Nousek., J., Yaqoob, T., Mushotzky, R. F., Makino, F., & Otani, C.,; 1995, ApJ, 458, 160
25: The Nature of the Low-Luminosity AGN in NGC 3147: Ptak., A., Yaqoob, T., Serlemitsos, P. J., Kunieda, H., & Terashima, Y.,; 1996, ApJ, 459, 542
26: The Iron K-alpha Line Profile in NGC 4151: Yaqoob, T., Edelson, R., Weaver, K. A., Warwick, R. S., Mushotzky, R. F., Serlemitsos, P. J., & Holt, S. S.,; 1995, ApJ, 453, L81
27: X-ray Transmission in Cold Matter: Nonrelativistic Corrections For Compton Scattering: Yaqoob, T.,; 1997, ApJ, 479, 184
28: The X-ray Variability of MKN 766: Leighly, K., Mushotzky, R. F., Yaqoob T., Kunieda, H., & Edelson, R.,; 1996, ApJ, 469, 147
29: Reprocessing Models and the ASCA Spectrum of MKN 290: Turner, T. J., George, I. M., Kallman, T., Yaqoob, T., & Zycki, P. T.,; 1996, ApJ, 472, 571
30: Multiwaveband Observations of Short Time-Scale Variability in NGC 4151. I. Ultraviolet Observations: Crenshaw, D. M., etal.; 1996 (87 authors), ApJ, 470, 322
31: Multiwaveband Observations of Short Time-Scale Variability in NGC 4151. III. X-ray and Gamma-ray Observations: Warwick, R. S., Smith, D. A., Yaqoob, T., Edelson, R., Johnson, W. N., Reichert, G. A., Clavel, J., Magdiziarz, P., Peterson, B. M., & Zdziarski, A. A.,; 1996, ApJ, 470, 349
32: Multiwaveband Observations of Short Time-Scale Variability in NGC 4151. IV. Analysis of Multiwavelength Continuum Variability: Edelson, R. etal.; 1996 (93 authors), ApJ, 470, 364
33: ASCA Observations of Seyfert 1 Galaxies. I. Data Analysis, Imaging and Timing: Nandra, K., George, I. M., Mushotzky, R. F., Turner, T. J., & Yaqoob, T.,; 1997, ApJ, 476, 70
34: ASCA Observations of Seyfert 1 Galaxies. II. Relativistic Iron Kalpha Emission: Nandra, K., George, I. M., Mushotzky, R. F., Turner, T. J., & Yaqoob, T.,; 1997, ApJ, 477, 602
35: Iron K-alpha Evidence for Two X-Ray Reprocessors in MCG -5-23-16: Weaver, K. A., Yaqoob, T., Mushotzky, R. F., Nousek, J., Hayashi, I., & Koyama, K.,; 1997, ApJ, 474, 675
36: Discovery Of Rapid Variability Of The Iron K Line Profile In The Seyfert Galaxy NGC 7314: Yaqoob, T., Serlemitsos, P. J., Turner, T. J., George, I. M., & Nandra, K.,; 1996, ApJL, 470, L27
37: The Complex X-ray Spectra of M82 and NGC 253: Implications for the AGN-Starburst Connection: Ptak, A., Serlemitsos, P. J., Yaqoob, T., & Tsuru, T.,; 1997, AJ, 113, 1286
38: Variability of the Iron K Emission Line in the Seyfert Galaxy NGC 3516: Nandra, K., Mushotzky, R. F., Yaqoob, T. George, I. M., & Turner, T. J.,; 1997, MNRAS, 284, L7
39: On the dependence of the iron-K line profiles with luminosity in Active Galactic Nuclei: Nandra, K., George, I. M., Mushotzky, R. F., Turner, T. J., & Yaqoob, T.,; 1997, ApJ, 488, L91
40: A Simple New Method for Analyzing Gapped Time Series: Search for a High-frequency Cutoff in the X-Ray Power Spectrum of the Seyfert Galaxy MCG -6-30-15: Yaqoob, T., McKernan, B., Ptak, A., Nandra, K., & Serlemitsos, P. J.,; 1997, ApJ, 490, L25
41: ASCA Observations of Seyfert 1 Galaxies. III. The Evidence for Absorption and Emission Due to Photoionized Gas: George, I. M., Turner, T. J., Netzer, H., Nandra, K., Mushotzky, R. F., & Yaqoob, T.,; 1998, ApJS, 114, 73
42: Parameter Estimation in X-Ray Astronomy Revisited: Yaqoob, T.,; 1998, ApJ, 500, 893
43: Occultation Mapping of the Central Engine in the Active Galaxy MCG -6-30-15: Mckernan, B., & Yaqoob, T.,; 1998, ApJ, 501, L29
44: On the Evidence for Extreme Gravity Effects in MCG -6-30-15: Weaver, K., & Yaqoob, T.,; 1998, ApJ, 502, L139
45: X-Ray Variability as a Probe of Advection-dominated Accretion in Low-Luminosity Active Galactic Nuclei: Ptak, A., Yaqoob, T., Muskotzky, R. F., Serlemitsos, P. J., & Griffiths, R. E.,; 1998, ApJ, 501, L37
46: The X-ray Spectral Variability of the Seyfert Galaxy NGC 3227 ,: George, I. M., Mushotzky, R. F., Turner, T. J., Yaqoob, T., Ptak, A., & Nandra, K.,; 1998, ApJ, astro-ph/9806392
47: A Peculiar Emission Line Feature in the X-ray Spectrum of PKS 0637-752: Yaqoob, T., George, I. M., Turner, T. J., Nandra, K., Ptak, A., & Serlemitsos, P. J.,; 1998, ApJ, 505, L87
48: Quasi-Simultaneous Observations of 3C 273 by BeppoSax and ASCA: Orr, A., Yaqoob, T., Parmar, A. N., Piro, L., White, N. E., & Grandi, P.; 1998, A&A, 337, 685
49: X-ray Constraints on Accretion and Starburst Processes in Galactic Nuclei I. Spectral Results: Ptak, A., Serlemitsos, P. J., Yaqoob, T., Mushotzky, R.,; 1999, ApJS, astro-ph/9808159
50: On the Unusually High Temperature of the Cluster of Galaxies 1E 0657-56: Yaqoob, T.,; 1999, ApJ, 511, L75
51: The Properties of the Relativistic Iron K-Line in NGC 3516: Nandra, K., George, I. M., Mushotzky, R. F., Turner, T. J., & Yaqoob, T.,; 1999, ApJ, 523, L17
52: X-Ray Properties of the Weak Seyfert 1 Nucleus in NGC 4639: Ho, L. C., Ptak, A., Terashima, Y., Kunieda, H., Serlemitsos, P. J., Yaqoob, T., Koratkar, A. P.,; 1999, ApJ, 525, 168
53: A Highly Doppler Blueshifted FE-K Emission Line in the High-Redshift QSO PKS 2149-306: Yaqoob, T., George, I. M., Nandra, K., Turner, T. J., Zobair, S., & Serlemitsos, P. J.,; 1999, ApJ, 525, L9
54: A Search for Short Timescale TeV Variability in Mkn501: Carson, M., McKernan, B., Yaqoob, T., & Fegan, D.,; 1999, Astroparticle Physics, Vol. 11., Issues 1-2, p. 153
55: X-ray Observations of Optically-Selected, Radio-Quiet Quasars I: The ASCA Results: George, I. M., Turner, T. J., Yaqoob, T., Netzer, H., Laor, A., Mushotzky, R. F., Nandra, K., & Takahashi, T.,; 1999, astro-ph/9910218
56: ASCA Observations of "Type 2" LINERs: Evidence for a Stellar Source of Ionization: Terashima, Y., Ho, L., Ptak, A., Mushotzky, R. F., Serlemitsos, P. J., Yaqoob, T., Kunieda, H.; 1999, astro-ph/9911340
57: Iron K Line Variability in the Low-Luminosity Active Galactic Nucleus NGC 4579: Terashima, Y. Ho, L. C.,Ptak, A. F., Yaqoob, T., Kunieda, H., Misaki, K., Serlemitsos, P. J.,; 2000, ApJ, 535, L79.
58: Short timescale variability in the broadband emission of the blazars Mkn421 and Mkn501: McKernan, B., Carson, M. J., Yaqoob, T., & Fegan, D. J.,; 2000, Astroparticle Physics, 14, 131.
59: Variable Iron K alpha Lines in Seyfert 1 Galaxies: Weaver, K. A., Gelbord, J., & Yaqoob, T.,; 2001, ApJ, 550, 261.
60: Physical Diagnostics from a Narrow Fe K alpha Emission Line Detected by Chandra in the Seyfert 1 Galaxy NGC 5548: Yaqoob, T., George, I. M., Turner, T. J., Nandra K., Serlemitsos, P. J., & Mushotzky, R. F.,; 2001, ApJ, 546, 759.
61: A Broad Fe K alpha Emission Line in the X-Ray Spectrum of the Quasar 3C 273: Yaqoob, T., & Serlemitsos, P. J.,; 2000, ApJ, 544, L95
62: Chandra Grating Spectroscopy of the Seyfert Galaxy Ton S180: Turner, T. J., George, I. M., Yaqoob, T., Kriss, G., Crenshaw, D. M., Kraemer, S., Zheng, W., Wang, J., Nandra, K,; 2001, ApJ, 548, L13.
63: Quasi-periodic Oscillation in Seyfert Galaxies: Significance Levels. The Case of Markarian 766: Benlloch, S., Wilms, J., Edelson, R., Yaqoob, T., & Staubert, R.,; 2001, ApJ, 562, L121.
64: The Spectral Energy Distribution of the Seyfert Galaxy Ton S180: Turner, T. J., Romano, P., Kraemer, S. B., George, I. M., Yaqoob, T. et al.; 2002, ApJ, 568, 120.
65: X-Ray Emission from the Nucleus of the Dwarf Elliptical Galaxy NGC 3226: George, I. M., Mushotzky, R. F., Yaqoob, T., Turner, T. J., Kraemer, S., Ptak, A. F., Nandra, K., Crenshaw, D. M., Netzer, H.,; 2001, ApJ, 559, 167.
66: The Detection of Circumnuclear X-Ray Emission from the Seyfert Galaxy NGC 3516: George, I. M., Turner, T. J., Netzer, H., Kraemer, S. B., Ruiz, J., Chelouche, D., Crenshaw, D. M., Yaqoob, T., Nandra, K., & Mushotzky, R. F., ApJ,; 2002, 571, 265.
67: Narrow Components within the Fe K alpha Profile of NGC 3516: Evidence of the Importance of General Relativistic Effects?: Turner, T. J., Mushotzky, R. F., Yaqoob, T., George, I. M., Snowden, S. L., Netzer, H., Kraemer, S. B., Nandra, K., & Chelouche, D.,; 2002, ApJ, 574, L123.
68: The Effect of Changes in the ASCA Calibration on the Fe K Lines in Active Galaxies: Yaqoob, T., Padmanabhan, U., Dotani, T., & Nandra, K.,; 2002, ApJ, 569, 487.
69: The Kinematics and Physical Conditions of the Ionized Gas in Markarian 509. I. Chandra High Energy Grating Spectroscopy: Yaqoob, Tahir, McKernan, Barry, Kraemer, Steven B., Crenshaw, D. Michael, Gabel, Jack R., George, Ian M., & Turner, T. Jane,; 2003, ApJ, 582, 105.
70: The Kinematics and Physical Conditions of the Ionized Gas in Markarian 509. II. STIS Echelle Observations: Kraemer, S. B., Crenshaw, D. M., Yaqoob, T., McKernan, B., Gabel, J. R., George, I. M., Turner, T. J., & Dunn, J. P.,; 2003, ApJ, 582, 125.
71: 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.
72: A Warm Hot Intergalactic Medium Towards 3C 120?: McKernan, B., Yaqoob, T., Mushotzky, R. F., George, I. M., & Turner, T. J.,; 2003, ApJ, 598, L83.
73: The Kinematics and Physical Conditions of the Ionized Gas in NGC 4593 from Chandra High-Energy Grating Spectroscopy.: McKernan, B., Yaqoob, T., George, I. M., & Turner, T. J.,; 2003, ApJ, 593, 142.
74: Simultaneous Ultraviolet and X-Ray Spectroscopy of the Seyfert 1 Galaxy NGC 5548. I. Physical Conditions in the Ultraviolet Absorbers: Crenshaw, D. M., Kraemer, S. B., Gabel, J. R., Kaastra, J. S., Steenbrugge, K. C., Brinkman, A. C., Dunn, J. P., George, I. M., Liedahl, D. A., Paerels, F. B. S., Turner, T. J., & Yaqoob, T.; 2003, ApJ, 594, 116.
75: A Puzzling X-Ray Source Found in the Chandra Deep Field-South: Wang, J., Yaqoob, T., Szokoly, G., Gilli, R., Kewley, L., Mainieri, V., Nonino, M., Rosati, P., Tozzi, P., Zheng, W., Zirm, A., & Norman, C.; 2003, ApJ, 590, L87
76: The XMM-Newton Iron Line Profile of NGC 3783: Reeves, J. N, Nandra, K., George, I. M., Pounds, K. A., Turner, T. J., \& Yaqoob, T.; 2004, ApJ, 602, 648.
77: The Cores of the Fe K Lines in Seyfert I Galaxies Observed by the Chandra High Energy Grating: Yaqoob, T. & Padmanabhan, U.; 2004, ApJ, 604, 63.
78: 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, in press (astro-ph/0403541)
79: High Resolution X-Ray Spectroscopy of the Fe K Complex in IC 4329a: Barry McKernan & Tahir Yaqoob; 2004, ApJ, in press (astro-ph/0401639)
80: Simultaneous X-ray and Ultraviolet spectroscopy of the Seyfert galaxy NGC 5548. III. X-ray time variability: Kaastra, J. S., Steenbrugge, K. C., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., Liedahl, D. A., van der Meer, R. L. J., Paerels, F. B. S., Turner, T. J., & Yaqoob, T.; 2004, ApJ, A&A in press (astro-ph/040446)
81: Iron K Features in the Quasar E 1821+643: Evidence for Gravitationally Redshifted Absorption: Tahir Yaqoob & Peter Serlemitsos 2004, ApJ, submitted
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