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A focused, hard X-ray look at ARP 299 with <i>Nu</i>STAR

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Authors:
  • Ptak, A. ;
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    NASA Goddard Space Flight Center
  • Hornschemeier, A. ;
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    NASA Goddard Space Flight Center
  • Zezas, A. ;
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    University of Crete
  • Lehmer, B. ;
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    NASA Goddard Space Flight Center
  • Yukita, M. ;
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    NASA Goddard Space Flight Center
  • Wik, D. ;
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    NASA Goddard Space Flight Center
  • Antoniou, V. ;
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    Harvard-Smithsonian Center for Astrophysics
  • Argo, M. K. ;
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    University of Manchester
  • Ballo, L. ;
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    National Institute for Astrophysics
  • Bechtol, K. ;
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    Kavli Institute for Cosmological Physics
  • Boggs, S. ;
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    Space Sciences Laboratory
  • Della Ceca, R. ;
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    National Institute for Astrophysics
  • Christensen, Finn Erland
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    Orcid logo0000-0001-5679-1946
    National Space Institute, Technical University of Denmark
DOI:
10.1088/0004-637X/800/2/104
Abstract:
We report on simultaneous observations of the local starburst system Arp 299 with NuSTAR and Chandra, which provides the first resolved images of this galaxy up to energies of ~45 keV. Fitting the 3-40 keV spectrum reveals a column density of NH ~ 4 × 1024 cm-2, characteristic of a Compton-thick active galactic nucleus (AGN), and a 10-30 keV luminosity of 1.2 × 1043 erg s-1. The hard X-rays detected by NuSTAR above 10 keV are centered on the western nucleus, Arp 299-B, which previous X-ray observations have shown to be the primary source of neutral Fe-K emission. Other X-ray sources, including Arp 299-A, the eastern nucleus also thought to harbor an AGN, as well as X-ray binaries, contribute ≲ 10% to the 10-20 keV emission from the Arp 299 system. The lack of significant emission above 10 keV other than that attributed to Arp 299-B suggests that: (1) any AGN in Arp 299-A must be heavily obscured (NH > 1024 cm-2) or have a much lower luminosity than Arp 299-B and (2) the extranuclear X-ray binaries have spectra that cut-off above ~10 keV. Such soft spectra are characteristic of ultraluminous X-ray sources observed to date by NuSTAR.
Type:
Journal article
Language:
English
Published in:
Astrophysical Journal, 2015, Vol 800, Issue 2
Keywords:
Galaxies: active; Galaxies: individual (Arp 299); Galaxies: starburst; X-rays: galaxies
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2015
Scientific Level:
Scientific
ID:
274305242

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