Broad-band X-ray study of Ultraluminous X-ray sources with Chandra, XMM-Newton and NuSTAR
Abstract
ULXs are point-like, extragalactic off-nuclear sources with apparent isotropic super-Eddington luminosity. Possible explanations for their emission include a regime of super Eddington accretion onto a stellar mass BH, or the presence of intermediate mass BHs. X-ray spectroscopy up to 50 keV will be soon made possible by NASA's NuSTAR hard X-ray telescope, which has an approved large program for simultaneous observations joint with XMM to obtain high-quality broadband spectra of five ULXs. In this proposal we request four 10ks Chandra exposures in two fields as nearly coincident with the joint XMM/NuSTAR observations as possible. These Chandra observations are crucial for determining the contribution to the ULX spectra of nearby variable X-ray sources not resolvable by XMM or NuSTAR.
- Publication:
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Chandra Proposal
- Pub Date:
- September 2012
- Bibcode:
- 2012cxo..prop.3576H