- Authors:
-
- Zhang, William W. ;
- Stern, Daniel ;
- Craig, William W. ;
- Parker, Michael ;
- Risaliti, Guido ;
- Boggs, Steven E. ;
- Hailey, Charles J. ;
- Grefenstette, Brian W. ;
- Forster, Karl ;
- Christensen, Finn Erland ;
- Miller, Jon M. ;
- Harrison, Fiona A. ;
- Fürst, Felix ;
- Webb, Natalie A. ;
- Hornschemeier, Ann E. ;
- Barret, Didier ;
- Fabian, Andrew C. ;
- Rana, Vikram R. ;
- Madsen, Kristin K. ;
- Ptak, Andrew ;
- Bachetti, Matteo ;
- Walton, Dominic J.
- DOI:
- 10.1051/epjconf/20136406010
- Abstract:
- We present the results of the first large program of broadband ULX observations with NuSTAR, XMM-Newton and Suzaku, yielding high-quality spectra and timing measurements from 0.3-30 keV in 6 ULXs, providing powerful information for understanding the accretion modes and nature of the central BHs. In particular, we find that all ULXs in our sample have a clear cutoff above 10 keV. This cutoff is less pronounced than expected by Comptonization from a cold, thick corona. We confirm the presence of a soft excess at low energies in the brightest ULXs, with temperatures below ~ 0.5 keV. We make an estimates on the masses of several ULXs based on spectral variability and model fitting. © 2014 Owned by the authors.
- Type:
- Journal article
- Language:
- English
- Published in:
- E P J Web of Conferences, 2014, Vol 64
- Main Research Area:
- Science/technology
- Publication Status:
- Published
- Review type:
- Peer Review
- Submission year:
- 2014
- Scientific Level:
- Scientific
- ID:
- 263984937
0000-0001-5679-1946
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