a Changing Inner Radius in the Accretion Disc of Q0056-363 ?

Details a Changing Inner Radius in the Accretion Disc of Q0056-363 ? a Changing Inner Radius in the Accretion Disc of Q0056-363 ?

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...75m&link_type=abstract

XMM-Newton Proposal ID #04019301

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Q0056-363, Xmm-Newton Proposal 04019301

Scientific paper

0056-363 was observed twice with XMM-Newton, in 2000 and 2003. In the second observation, the soft X-ray emission was less prominent, the UV flux lower, the hard X-ray emission flatter, and the iron line much less intense than in the first observation. These changes are consistent with a scenario in which the inner disc radius changed between the two observations, being close to the innermost stable orbit in the first observation, while the disc was truncated at a larger radius in the second observation. We propose to observe Q0056-363 again, twice (once per visibility window), for 40 ks each, to confirm or rule out the `changing inner radius' scenario, and to further study the rather extreme spectral evolution of this source.

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