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SUMMARY:X-ray reflection in a sample of X-ray bright Ultraluminous X-ray s
 ources - Maria Caballero-Garcia\, IoA
DTSTART:20090916T160000Z
DTEND:20090916T161500Z
UID:TALK19881@talks.cam.ac.uk
CONTACT:Alexander Blustin
DESCRIPTION:We apply a reflection-based model to the best available XMM-Ne
 wton spectra of X-ray bright Ultraluminous X-ray (ULX) sources (NGC 1313 X
 -1\, NGC 1313 X-2\, M 81 X-6\, Holmberg IX X-1\, NGC 5408 X-1 and Holmberg
  II X-1). A spectral drop is apparent in the data of all the sources at en
 ergies 6-7 keV. The drop is interpreted here in terms of relativistically 
 blurred ionized reflection from the accretion disk. A soft-excess is also 
 detected from these sources (as usually found in the spectra of AGN)\, wit
 h emission from O K and Fe L\, in the case of NGC 5408 X-1 and Holmberg II
  X-1\, which can be understood as features arising from reflection of the 
 disk. Remarkably\, ionized disk reflection and the associated powerlaw con
 tinuum provide a good description of the broad-band spectrum\, including t
 he soft-excess. With exception of NGC 1313 X-2 and M81 X-6\, there is no r
 equirement for thermal emission from the inner disk in the description of 
 the spectra. The black holes of these systems must then be highly spinning
 \, with a spin close to the maximum rate of a maximal spinning black hole.
  The results require the action of strong light bending in these sources.W
 e discuss our results in terms of the masses of the black holes. 
LOCATION:Sackler Lecture Theatre\, IoA
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