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A Hard X-Ray Study of the Normal Star-forming Galaxy M83 with NuSTAR

Yukita, M. and Hornschemeier, A. E. and Lehmer, B. D. and Ptak, A. and Wik, D. R. and Zezas, A. and Antoniou, V. and Maccarone, T. J. and Replicon, V. and Tyler, J. B. and Venters, T. and Argo, M. K. and Bechtol, K. and Boggs, S. and Christensen, F. E. and Craig, W. W. and Hailey, C. and Harrison, F. A. and Krivonos, R. and Kuntz, K. and Stern, D. and Zhang, W. W. (2016) A Hard X-Ray Study of the Normal Star-forming Galaxy M83 with NuSTAR. Astrophysical Journal, 824 (2). Art. No. 107. ISSN 0004-637X. doi:10.3847/0004-637X/824/2/107.

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We present the results from sensitive, multi-epoch NuSTAR observations of the late-type star-forming galaxy M83 (d = 4.6 Mpc). This is the first investigation to spatially resolve the hard (E > 10 keV) X-ray emission of this galaxy. The nuclear region and ~20 off-nuclear point sources, including a previously discovered ultraluminous X-ray source, are detected in our NuSTAR observations. The X-ray hardnesses and luminosities of the majority of the point sources are consistent with hard X-ray sources resolved in the starburst galaxy NGC 253. We infer that the hard X-ray emission is most likely dominated by intermediate accretion state black hole binaries and neutron star low-mass X-ray binaries (Z-sources). We construct the X-ray binary luminosity function (XLF) in the NuSTAR band for an extragalactic environment for the first time. The M83 XLF has a steeper XLF than the X-ray binary XLF in NGC 253, which is consistent with previous measurements by Chandra at softer X-ray energies. The NuSTAR integrated galaxy spectrum of M83 drops quickly above 10 keV, which is also seen in the starburst galaxies NGC 253, NGC 3310, and NGC 3256. The NuSTAR observations constrain any active galactic nucleus (AGN) to be either highly obscured or to have an extremely low luminosity of ≾ 10^(38) erg s^(−1) (10–30 keV), implying that it is emitting at a very low Eddington ratio. An X-ray point source that is consistent with the location of the nuclear star cluster with an X-ray luminosity of a few times 10^(38) erg s^(−1) may be a low-luminosity AGN but is more consistent with being an X-ray binary.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Yukita, M.0000-0001-6366-3459
Hornschemeier, A. E.0000-0001-8667-2681
Lehmer, B. D.0000-0003-2192-3296
Ptak, A.0000-0001-5655-1440
Wik, D. R.0000-0001-8952-676X
Zezas, A.0000-0001-8952-676X
Antoniou, V.0000-0001-7539-1593
Maccarone, T. J.0000-0003-0976-4755
Boggs, S.0000-0001-9567-4224
Christensen, F. E.0000-0001-5679-1946
Harrison, F. A.0000-0003-2992-8024
Krivonos, R.0000-0003-2737-5673
Stern, D.0000-0003-2686-9241
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2016. The American Astronomical Society. Received 2015 September 9; accepted 2016 March 25; published 2016 June 20. We thank the referee for useful comments and suggests that improved this paper. This work was supported under NASA Contract No. NNG08FD60C, and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We sincerely thank Karl Forster and Brian Grefenstette for their work on the complicated stray light pattern and for assistance in designing the NuSTAR observational setup for minimizing this contamination. We also thank NuSTAR and Chandra mission planners for making the Chandra and NuSTAR observations simultaneous. We also thank P. Tzanavaris and D. Swartz for helpful discussion. Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number GO4-15086Z issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. R.K. acknowledges support from Russian Science Foundation (grant 14-12-01315). Facilities: Chandra - , NuSTAR - The NuSTAR (Nuclear Spectroscopic Telescope Array) mission, XMM-Newton - .
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Russian Science Foundation14-12-01315
Subject Keywords:galaxies: individual: M83, galaxies: starburst, galaxies: star formation, X-rays: galaxies
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2016-49
Issue or Number:2
Record Number:CaltechAUTHORS:20160804-095528789
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69436
Deposited By: Deborah Miles
Deposited On:10 Aug 2016 22:04
Last Modified:11 Nov 2021 04:14

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