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1H0707-495 in 2011: An X-ray source within a gravitational radius of the event horizon

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AuthorsFabian, A.C.; Zoghbi, A.; Wilkins, D.; Dwelly, T.; Uttley, P.; Schartel, N.; Miniutti, G.; Gallo, L.; Grupe, D.; Komossa, S.; Santos-Lleó, M.
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Issue Date2012
PublisherBlackwell Publishing
CitationMonthly Notices of the Royal Astronomical Society 419: 116- 123 (2012)
AbstractThe narrow-line Seyfert 1 Galaxy 1H0707-495 went into a low state from 2010 December to 2011 February, discovered by a monitoring campaign using the X-Ray Telescope on theSwiftsatellite. We triggered a 100 ksXMM-Newtonobservation of the source in 2011 January, revealing the source to have dropped by a factor of 10 in the soft band, below 1keV, and a factor of 2 at 5keV, compared with a long observation in 2008. The sharp spectral drop in the source usually seen around 7keV now extends to lower energies, below 6keV in our frame. The 2011 spectrum is well fitted by a relativistically blurred reflection spectrum similar to that which fits the 2008 data, except that the emission is now concentrated solely to the central part of the accretion disc. The irradiating source must lie within 1 gravitational radius of the event horizon of the black hole, which spins rapidly. Alternative models are briefly considered, but none has any simple physical interpretation. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
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