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http://hdl.handle.net/20.500.12386/23604
Title: | A Focused, Hard X-Ray Look at Arp 299 with NuSTAR | Authors: | Ptak, A. Hornschemeier, A. Zezas, A. Lehmer, B. Yukita, M. Wik, D. Antoniou, V. Argo, M. K. Ballo, L. Bechtol, K. Boggs, S. DELLA CECA, Roberto Christensen, F. E. Craig, W. W. Hailey, C. J. Harrison, F. A. Krivonos, R. Maccarone, T. J. Stern, D. Tatum, M. Venters, T. Zhang, W. W. |
Issue Date: | 2015 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 800 | Issue: | 2 | First Page: | 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 × 10^(24) cm^(-2), characteristic of a Compton-thick active galactic nucleus (AGN), and a 10-30 keV luminosity of 1.2 × 10^(43) 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 (N H > 10^(24) 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. | Acknowledgments: | 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. The scientific results reported in this article are based in part on observations made by the Chandra X-ray Observatory . We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis 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). We also made use of the NASA/IPAC Extragalactic Database (NED) and NASA's Astrophysics Data System. L.B. received financial supports from the European Commission Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 267251 “Astronomy Fellowships in Italy” (AstroFIt). A.Z. acknowledges partial support by NASA grant NNX12AN05G and Chandra grant GO3-14124X. We thank the anonymous referee for suggestions that improved this paper. | URI: | http://hdl.handle.net/20.500.12386/23604 | URL: | https://iopscience.iop.org/article/10.1088/0004-637X/800/2/104 | ISSN: | 0004-637X | DOI: | 10.1088/0004-637X/800/2/104 | Bibcode ADS: | 2015ApJ...800..104P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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