A quest for aperiodic variability and spectral curvature in the NGC 4559 ULXs
Abstract
We propose to perform a 100 ks observation of NGC 4559 with XMM-Newton in order to unambiguously establish if intrinsic variability is present in the power density spectrum of the ultraluminous X-ray source NGC 4559 X-7. The discovery of a QPO or a break would provide for the first time for this ULX a characteristic frequency of variability and would allow us to obtain an independent estimate of the BH mass. A 100 ks observation would allow us also to obtain a spectrum with unprecedented counting statistics that will prove if this ULX contains a cool, optically thick corona. A similar analyis will be performed also on the other bright ULX hosted in NGC 4559 (source X-10).
- Publication:
-
XMM-Newton Proposal
- Pub Date:
- October 2009
- Bibcode:
- 2009xmm..prop...63Z
- Keywords:
-
- White Dwarf Binaries;
- Neutron Star Binaries;
- Cataclysmic Variables;
- ULXs;
- Black Holes;
- NGC4559X-7;
- NGC4559X-7;
- NGC4559X-7;
- NGC4559X-7;
- NGC4559X-7;
- NGC4559X-7;
- NGC4559X-7