A consistent picture emerges: A compact X-ray continuum emission region in the gravitationally lensed quasar SDSS J0924+0219

Journal Article · Sat Jun 20 00:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/806/2/258· OSTI ID:22882994

MacLeod, Chelsea L.; Morgan, Christopher W. ^[1]; Mosquera, A.; Kochanek, C. S. ^[2]; Tewes, M. ^[3]; Courbin, F.; Meylan, G. ^[4]; Chen, B.; Dai, X. ^[5]

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1. Physics Department, United States Naval Academy, Annapolis, MD 21403 (United States)
2. Department of Astronomy, The Ohio State University, Columbus, OH 43210 (United States)
3. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn (Germany)
4. Laboratoire d’astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix (Switzerland)
5. Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, Norman, OK 73019 (United States)

We analyze the optical, UV, and X-ray microlensing variability of the lensed quasar SDSS J0924+0219 using six epochs of Chandra data in two energy bands (spanning 0.4–8.0 keV, or 1–20 keV in the quasar rest frame), 10 epochs of F275W (rest-frame 1089 Å) Hubble Space Telescope data, and high-cadence R-band (rest-frame 2770 Å) monitoring spanning 11 years. Our joint analysis provides robust constraints on the extent of the X-ray continuum emission region and the projected area of the accretion disk. The best-fit half-light radius of the soft X-ray continuum emission region is between 5×10{sup 13} and 10{sup 15} cm, and we find an upper limit of 10{sup 15} cm for the hard X-rays. The best-fit soft-band size is about 13 times smaller than the optical size, and roughly 7GM{sub BH}/c{sup 2} for a 2.8×10{sup 8} M{sub ⊙} black hole, similar to the results for other systems. We find that the UV emitting region falls in between the optical and X-ray emitting regions at 10{sup 14} cm < r{sub 1/2,UV}<3×10{sup 15} cm. Finally, the optical size is significantly larger, by 1.5σ, than the theoretical thin-disk estimate based on the observed, magnification-corrected I-band flux, suggesting a shallower temperature profile than expected for a standard disk.

• OSTI ID: 22882994
• Journal Information: Astrophysical Journal, Vol. 806, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
• Country of Publication: United Kingdom
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCRETION DISKS
BLACK HOLES
EMISSION
GRAVITATIONAL LENSES
KEV RANGE
QUASARS
SPACE
TELESCOPES