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25 April 2024

» arxiv » 1310.0745

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The ultraluminous X-ray sources NGC 1313 X-1 and X-2: a broadband study with NuSTAR and XMM-Newton
Matteo Bachetti ; Vikram Rana ; Dominic J. Walton ; Didier Barret ; Fiona A. Harrison ; Steven E. Boggs ; Finn E. Christensen ; William W. Craig ; Andrew C. Fabian ; Felix Fürst ; Brian W. Grefenstette ; Charles J. Hailey ; Ann Hornschemeier ; Kristin K. Madsen ; Jon M. Miller ; Andrew F. Ptak ; Daniel Stern ; Natalie A. Webb ; William W. Zhang ;
Date:	2 Oct 2013
Abstract:	We present the results of NuSTAR and XMM-Newton observations of the two ultraluminous X-ray sources (ULX) 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 black body component at ~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.
Source:	arXiv, 1310.0745
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