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The ultraluminous x-ray sources ngc 1313 x-1 and x-2: a broadband study with NuSTAR and XMM-Newton

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Authors:
  • Bachetti, Matteo ;
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    Universite de Toulouse
  • Rana, Vikram ;
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    California Institute of Technology
  • Walton, Dominic J. ;
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    California Institute of Technology
  • Barret, Didier ;
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    Universite de Toulouse
  • Harrison, Fiona A. ;
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    California Institute of Technology
  • Boggs, Steven E. ;
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    University of California at Berkeley
  • Christensen, Finn Erland ;
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    Orcid logo0000-0001-5679-1946
    National Space Institute, Technical University of Denmark
  • Craig, William W. ;
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    Lawrence Livermore National Laboratory
  • Fabian, Andrew C. ;
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    University of Cambridge
  • Fuerst, Felix ;
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    California Institute of Technology
  • Grefenstette, Brian W. ;
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    California Institute of Technology
  • Hailey, Charles J. ;
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    Columbia University
  • Hornschemeier, Ann ;
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    NASA Goddard Space Flight Center
  • Madsen, Kristin K. ;
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    California Institute of Technology
  • Miller, Jon M. ;
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    University of Michigan
  • Ptak, Andrew F. ;
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    NASA Goddard Space Flight Center
  • Stern, Daniel ;
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    California Institute of Technology
  • Webb, Natalie A. ;
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    Universite de Toulouse
  • Zhang, William W.
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    NASA Goddard Space Flight Center
DOI:
10.1088/0004-637X/778/2/163
Abstract:
We present the results of NuSTAR and XMM-Newton observations of the two ultraluminous X-ray sources: NGC 1313 X-1 and X-2. The combined spectral bandpass of the two satellites enables us to produce the first spectrum of X-1 between 0.3 and 30 keV, while X-2 is not significantly detected by NuSTAR above 10 keV. The NuSTAR data demonstrate that X-1 has a clear cutoff above 10 keV, whose presence was only marginally detectable with previous X-ray observations. This cutoff rules out the interpretation of X-1 as a black hole in a standard low/hard state, and it is deeper than predicted for the downturn of a broadened iron line in a reflection-dominated regime. The cutoff differs from the prediction of a single-temperature Comptonization model. Further, a cold disk-like blackbody component at similar to 0.3 keV is required by the data, confirming previous measurements by XMM-Newton only. We observe a spectral transition in X- 2, from a state with high luminosity and strong variability to a lower-luminosity state with no detectable variability, and we link this behavior to a transition from a super-Eddington to a sub-Eddington regime.
Type:
Journal article
Language:
English
Published in:
Astrophysical Journal, 2013, Vol 778, Issue 2
Keywords:
ASTRONOMY; MASS BLACK-HOLES; QUASI-PERIODIC OSCILLATIONS; SUPER-EDDINGTON ACCRETION; ACTIVE GALAXIES; BINARY-SYSTEMS; ESO 243-49; SLIM DISK; VARIABILITY; STATE; SPECTRA
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
256282894

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