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Title: A Hard X-Ray Study of Ultraluminous X-ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton
Authors: Mukherjee, E. S.
Walton, D. J.
Rana, V
+16 Co-Authors
Keywords: black hole physics
X-rays: binaries
X-rays: individual: NGC 5204 X-1
Issue Date: 20-Jul-2015
Publisher: IOP Sciences for The American Astronomical Society
Citation: The Astrophysical Journal, 2015, Vol.808, p7
Abstract: We present the results from coordinated X-ray observations of the ultraluminous X-ray source NGC 5204 X-1 performed by the Nuclear Spectroscopic Telescope Array and XMM-Newton in early 2013. These observations provide the first detection of NGC 5204 X-1 above 10 {keV}, extending the broadband coverage to 0.3-20 {keV}. The observations were carried out in two epochs separated by approximately 10 days, and showed little spectral variation with an observed luminosity of {L}{{X}}=(4.95+/- 0.11)× {10}39 erg s-1. The broadband spectrum robustly confirms the presence of a clear spectral downturn above 10 {keV} seen in some previous observations. This cutoff is inconsistent with the standard low/hard state seen in Galactic black hole binaries, as would be expected from an intermediate-mass black hole accreting at significantly sub-Eddington rates given the observed luminosity. The continuum is apparently dominated by two optically thick thermal-like components, potentially accompanied by a faint high-energy tail. The broadband spectrum is likely associated with an accretion disk that differs from a standard Shakura & Sunyaev thin disk.
Description: Open Access.
ISSN: 0004-637X
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Copyright: 2015, The American Astronomical Society
Appears in Collections:Research Papers (A&A)

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