J0227: linking a ULX's X-ray spectrum to its black hole mass
Abstract
Are ultraluminous X-ray sources intermediate mass black holes orstellar mass black holes accreting above the Eddington limit? Severalof these sources show X-ray spectra that are unlike those of GalacticX-ray binaries, and are suspected to be a sign of super-Eddingtonaccretion. However, observing a ULX in this spectral state andindependently measuring the mass of its black hole has to date only beenaccomplished for one ULX. Here, we propose a deep XMM-Newton and a shortHST observation of J022721+333500, a ULX in NGC 925 and the second ULXfor which we have a good chance of measuring its black hole mass throughradial velocity measurements. Initial kinematic results suggest thatthe black hole is more massive than a typical stellar-mass black hole.
- Publication:
-
XMM-Newton Proposal
- Pub Date:
- October 2014
- Bibcode:
- 2014xmm..prop..114H