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The NuSTAR view of nearby compton-thick active galactic nuclei : the cases of NGC 424, NGC 1320, and IC 2560.

Baloković, M. and Comastri, A. and Harrison, F.A. and Alexander, D.M. and Ballantyne, D.R. and Bauer, F.E. and Boggs, S.E. and Brandt, W.N. and Brightman, M. and Christensen, F.E. and Craig, W.W. and Del Moro, A. and Gandhi, P. and Hailey, C.J. and Koss, M. and Lansbury, G.B. and Luo, B. and Madejski, G.M. and Marinucci, A. and Matt, G. and Markwardt, C.B. and Puccetti, S. and Reynolds, C.S. and Risaliti, G. and Rivers, E. and Stern, D. and Walton, D.J. and Zhang, W.W. (2014) 'The NuSTAR view of nearby compton-thick active galactic nuclei : the cases of NGC 424, NGC 1320, and IC 2560.', Astrophysical journal., 794 (2). p. 111.

Abstract

We present X-ray spectral analyses for three Seyfert 2 active galactic nuclei (AGNs), NGC 424, NGC 1320, and IC 2560, observed by NuSTAR in the 3-79 keV band. The high quality hard X-ray spectra allow detailed modeling of the Compton reflection component for the first time in these sources. Using quasi-simultaneous NuSTAR and Swift/XRT data, as well as archival XMM-Newton data, we find that all three nuclei are obscured by Compton-thick material with column densities in excess of ~5 × 1024 cm–2, and that their X-ray spectra above 3 keV are dominated by reflection of the intrinsic continuum on Compton-thick material. Due to the very high obscuration, absorbed intrinsic continuum components are not formally required by the data in any of the sources. We constrain the intrinsic photon indices and the column density of the reflecting medium through the shape of the reflection spectra. Using archival multi-wavelength data we recover the intrinsic X-ray luminosities consistent with the broadband spectral energy distributions. Our results are consistent with the reflecting medium being an edge-on clumpy torus with a relatively large global covering factor and overall reflection efficiency of the order of 1%. Given the unambiguous confirmation of the Compton-thick nature of the sources, we investigate whether similar sources are likely to be missed by commonly used selection criteria for Compton-thick AGNs, and explore the possibility of finding their high-redshift counterparts.

Item Type:Article
Keywords:Galaxies: individual (NGC 424, NGC 1320, IC 2560), Galaxies: nuclei, Galaxies: Seyfert; Techniques: spectroscopic; X-rays: galaxies.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1088/0004-637X/794/2/111
Publisher statement:© 2014. The American Astronomical Society. All rights reserved.
Date accepted:14 August 2014
Date deposited:21 May 2015
Date of first online publication:October 2014
Date first made open access:No date available

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