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SUMMARY:Discovery of powerful winds in Ultraluminous X-ray sources - Ciro 
 Pinto (Institute of Astronomy)
DTSTART:20151104T134500Z
DTEND:20151104T141500Z
UID:TALK60847@talks.cam.ac.uk
CONTACT:Andrew Shannon
DESCRIPTION:Ultraluminous X-ray sources (ULXs) are exceptionally bright as
 tronomical objects found throughout the local Universe. Their extreme lumi
 nosities\, above 10^39 erg/s\, must result from the process of accretion o
 nto a compact object. Viable solutions include accretion onto neutron star
 s with strong magnetic fields\, accretion onto stellar mass black holes (<
  100 M_solar) at or in excess of the classical Eddington limit (super-crit
 ical accretion) or accretion at more sedate rates onto intermediate mass b
 lack holes (IMBHs 10^3-5 M_solar). A major obstacle has been the profound 
 lack of unambiguous atomic features in the X-ray spectra of these sources 
 which can be used to diagnose the nature of the accretion flow around the 
 compact object. As a result\, the true nature of the wider population of U
 LXs has been shrouded in debate. Here we identify strong (> 5-sigma)\, res
 t-frame emission lines and narrow\, blue-shifted (~0.2-0.3c) absorption li
 nes from a high spectral-energy-resolution study of the archetypal ULX\, N
 GC 1313 X-1 using the XMM-Newton Reflection Grating Spectrometer. The dete
 ctions confirm the presence of powerful winds in this source and by extens
 ion other similar ULXs.
LOCATION:Sackler Lecture Theatre\, IoA
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