A Hard X-Ray Study of Ultraluminous X-ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton
作者： E. S. Mukherjee , D. J. Walton , M. Bachetti , F. A. Harrison , D. Barret
DOI: 10.1088/0004-637X/808/1/64
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摘要: We present the results from coordinated X-ray observations of ultraluminous source NGC 5204 X-1 performed by NuSTAR and XMM-Newton in early 2013. These provide first detection above 10 keV, extending broadband coverage to 0.3-20 keV. The were carried out two epochs separated approximately days, showed little spectral variation, with an observed luminosity Lx = (4.95+/-0.11)e39 erg/s. spectrum confirms presence a clear downturn keV seen some previous observations. This cutoff is inconsistent standard low/hard state Galactic black hole binaries, as would be expected intermediate mass accreting at significantly sub-Eddington rates given luminosity. continuum apparently dominated optically thick thermal-like components, potentially accompanied faint high energy tail. likely associated accretion disk that differs Shakura & Sunyaev thin disk.
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