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A Hard X-Ray Study of the Ultraluminous X-Ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton

Mukherjee, E. S. and Walton, D. J. and Bachetti, M. and Harrison, F. A. and Barret, D. and Bellm, E. and Boggs, S. E. and Christensen, F. E. and Craig, W. W. and Fabian, A. C. and Fuerst, F. and Grefenstette, B. W. and Hailey, C. J. and Madsen, K. K. and Middleton, M. J. and Miller, J. M. and Rana, V. and Stern, D. and Zhang, W. (2015) A Hard X-Ray Study of the Ultraluminous X-Ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton. Astrophysical Journal, 808 (1). Art. No. 64. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20150831-100926591

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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) x 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/808/1/64DOIArticle
http://iopscience.iop.org/0004-637X/808/1/64/PublisherArticle
http://arxiv.org/abs/1502.01764arXivDiscussion Paper
ORCID:
AuthorORCID
Walton, D. J.0000-0001-5819-3552
Bachetti, M.0000-0002-4576-9337
Harrison, F. A.0000-0003-2992-8024
Bellm, E.0000-0001-8018-5348
Boggs, S. E.0000-0001-9567-4224
Madsen, K. K.0000-0003-1252-4891
Rana, V.0000-0003-1703-8796
Stern, D.0000-0003-2686-9241
Additional Information:© 2015 American Astronomical Society. Received 2015 February 5; accepted 2015 June 9; published 2015 July 17. The authors thank the referee for useful feedback which helped improve the final manuscript. This research has made use of data obtained with the NuSTAR mission, a project led by the California Institute of Technology (Caltech), managed by the Jet Propulsion Laboratory (JPL) and funded by NASA, and with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analsis of these observations. This research has made use of the NuSTAR Data Analysis Software ( NUSTARDAS), jointly developed by the ASI Science Data Center (ASDC, Italy) and Caltech (USA).
Group:NuSTAR, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
ESA Member StatesUNSPECIFIED
Subject Keywords: black hole physics; X-rays: binaries; X-rays: individual (NGC 5204 X-1)
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-50
Record Number:CaltechAUTHORS:20150831-100926591
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150831-100926591
Official Citation:A Hard X-Ray Study of the Ultraluminous X-Ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton E. S. Mukherjee et al. 2015 ApJ 808 64
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59985
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:31 Aug 2015 17:43
Last Modified:30 Nov 2017 22:17

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