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The Multi-layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTAR

Rivers, E. and Risaliti, G. and Walton, D. J. and Harrison, F. and Arévalo, P. and Bauer, F. E. and Boggs, S. E. and Brenneman, L. W. and Brightman, M. and Christensen, F. E. and Craig, W. W. and Fürst, F. and Hailey, C. J. and Hickox, R. C. and Marinucci, A. and Reeves, J. and Stern, D. and Zhang, W. W. (2015) The Multi-layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTAR. Astrophysical Journal, 804 (2). Art. No. 107. ISSN 0004-637X. doi:10.1088/0004-637X/804/2/107.

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Between 2012 July and 2013 February, NuSTAR and XMM-Newton performed four long-look joint observations of the type 1.8 Seyfert, NGC 1365. We have analyzed the variable absorption seen in these observations in order to characterize the geometry of the absorbing material. Two of the observations caught NGC 1365 in an unusually low absorption state, revealing complexity in the multi-layer absorber that had previously been hidden. We find the need for three distinct zones of neutral absorption in addition to the two zones of ionized absorption and the Compton-thick torus previously seen in this source. The most prominent absorber is likely associated with broad-line region clouds with column densities of around ~10^(23) cm^(−2) and a highly clumpy nature as evidenced by an occultation event in 2013 February. We also find evidence of a patchy absorber with a variable column around ~10^(22) cm^(−2) and a line-of-sight covering fraction of 0.3–0.9, which responds directly to the intrinsic source flux, possibly due to a wind geometry. A full-covering, constant absorber with a low column density of ~1 × 10^(22) cm^(−2) is also present, though the location of this low density haze is unknown.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Walton, D. J.0000-0001-5819-3552
Harrison, F.0000-0003-2992-8024
Bauer, F. E.0000-0002-8686-8737
Boggs, S. E.0000-0001-9567-4224
Brightman, M.0000-0002-8147-2602
Christensen, F. E.0000-0001-5679-1946
Fürst, F.0000-0003-0388-0560
Hickox, R. C.0000-0003-1468-9526
Stern, D.0000-0003-2686-9241
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2015 American Astronomical Society. Received 2014 November 7; accepted 2015 March 6; published 2015 May 7. 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 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 the California Institute of Technology (USA). This work has also made use of HEASARC online services, supported by NASA/GSFC, and the NASA/IPAC Extragalactic Database, operated by JPL/California Institute of Technology under contract with NASA. This work also made use of data from the XMM-Newton observatory. Facilities: NuSTAR, XMM
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:galaxies: active; galaxies: individual (NGC 1365); X-rays: galaxies
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-63
Issue or Number:2
Record Number:CaltechAUTHORS:20150619-084553247
Persistent URL:
Official Citation:The Multi-layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTAR E. Rivers et al. 2015 ApJ 804 107
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58362
Deposited By: Ruth Sustaita
Deposited On:19 Jun 2015 16:48
Last Modified:10 Nov 2021 22:03

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