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The NuSTAR ULX program

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Authors:
  • Zhang, William W. ;
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    unknown
  • Stern, Daniel ;
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  • Craig, William W. ;
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  • Parker, Michael ;
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  • Risaliti, Guido ;
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    unknown
  • Boggs, Steven E. ;
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  • Hailey, Charles J. ;
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  • Grefenstette, Brian W. ;
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  • Forster, Karl ;
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  • Christensen, Finn Erland ;
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    Orcid logo0000-0001-5679-1946
    National Space Institute, Technical University of Denmark
  • Miller, Jon M. ;
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    unknown
  • Harrison, Fiona A. ;
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  • Fürst, Felix ;
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    unknown
  • Webb, Natalie A. ;
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  • Hornschemeier, Ann E. ;
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  • Barret, Didier ;
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  • Fabian, Andrew C. ;
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  • Rana, Vikram R. ;
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  • Madsen, Kristin K. ;
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  • Ptak, Andrew ;
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  • Bachetti, Matteo ;
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  • Walton, Dominic J.
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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

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