A Caltech Library Service

A Focused, Hard X-Ray Look at Arp 299 with NuSTAR

Ptak, A. and Hornschemeier, A. and Zezas, A. and Lehmer, B. and Yukita, M. and Wik, D. and Antoniou, V. and Argo, M. K. and Ballo, L. and Bechtol, K. and Boggs, S. and Della Ceca, R. and Christensen, F. E. and Craig, W. W. and Hailey, C. J. and Harrison, F. A. and Krivonos, R. and Maccarone, T. J. and Stern, D. and Tatum, M. and Venters, T. and Zhang, W. W. (2015) A Focused, Hard X-Ray Look at Arp 299 with NuSTAR. Astrophysical Journal, 800 (2). Art. No. 104. ISSN 0004-637X. doi:10.1088/0004-637X/800/2/104.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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 N_H ~ 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ptak, A.0000-0001-5655-1440
Hornschemeier, A.0000-0001-8667-2681
Zezas, A.0000-0001-8952-676X
Lehmer, B.0000-0003-2192-3296
Yukita, M.0000-0001-6366-3459
Wik, D.0000-0001-8952-676X
Antoniou, V.0000-0001-7539-1593
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
Maccarone, T. J.0000-0003-0976-4755
Stern, D.0000-0003-2686-9241
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2015 American Astronomical Society. Received 2014 May 22; accepted 2014 December 3; published 2015 February 18. 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.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
European Research Council (ERC)267251
Subject Keywords:galaxies: active; galaxies: individual (Arp 299); galaxies: starburst; X-rays: galaxies
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-80
Issue or Number:2
Record Number:CaltechAUTHORS:20150323-142831946
Persistent URL:
Official Citation:A Focused, Hard X-Ray Look at Arp 299 with NuSTAR A. Ptak et al. 2015 ApJ 800 104
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55984
Deposited By: Ruth Sustaita
Deposited On:23 Mar 2015 22:19
Last Modified:10 Nov 2021 20:53

Repository Staff Only: item control page