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The NuSTAR view of reflection and absorption in NGC 7582

The NuSTAR view of reflection and absorption in NGC 7582
The NuSTAR view of reflection and absorption in NGC 7582
NGC 7582 is a well-studied X-ray bright Seyfert 2 with moderately heavy (NH ~ 1023 - 1024 cm-2), highly variable absorption and strong reflection spectral features. The spectral shape changed around the year 2000, dropping in observed flux and becoming much more highly absorbed. Two scenarios have been put forth to explain this spectral change: (1) the central X-ray source partially "shut off" around this time, decreasing in intrinsic luminosity, with a delayed decrease in reflection features due to the light-crossing time of the Compton-thick material or (2) the source became more heavily obscured, with only a portion of the power law continuum leaking through. NuSTAR observed NGC 7582 twice in 2012, two weeks apart, in order to quantify the reflection using high-quality data above 10 keV. We find that the most plausible scenario is that NGC 7582 has recently become more heavily absorbed by a patchy torus with a covering fraction of ~80%–90% and an equatorial column density of ~ 3 ×1024 cm-2. We find the need for an additional highly variable full-covering absorber with NH = (4–6) × 1023 cm-2 in the line of sight, possibly associated with a hidden broad line region.
1538-4357
1-9
Rivers, E.
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Balokovic, M.
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Arevalo, P.
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Bauer, F.E.
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Boggs, S.E.
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Brandt, W.N.
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Brightman, M.
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Christensen, F.E.
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Criag, W.W.
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Gandhi, P.
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Hailey, C.J.
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Harrison, F.
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Koss, M.
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Ricci, C.
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Stern, D.
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Walkton, D.J.
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Zhang, W.W.
ce873dd4-1b5f-4982-896a-f06fca99fb1b
Rivers, E.
62141ed8-11fc-4561-a786-e3e40b2a3091
Balokovic, M.
14260868-dc7d-4ef8-a074-364b8d11e405
Arevalo, P.
eb2c36e7-2984-4048-b2fd-22e1cd8ca325
Bauer, F.E.
4090334d-93b3-4fd4-83bf-3c65385dce47
Boggs, S.E.
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Brandt, W.N.
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Brightman, M.
eb110ae1-9a2c-4968-b9ef-e7955feba535
Christensen, F.E.
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Criag, W.W.
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Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Hailey, C.J.
21767629-445e-4929-99cc-64d9344b4cbb
Harrison, F.
11068c24-8329-49f5-90da-2a402b22ef5e
Koss, M.
387f73a9-87d6-4b71-b8ec-c57be5592e92
Ricci, C.
82c8f75d-8215-4054-8b69-4cd30ab2d774
Stern, D.
a573010b-ca8e-4018-b0f5-4621657713b3
Walkton, D.J.
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Zhang, W.W.
ce873dd4-1b5f-4982-896a-f06fca99fb1b

Rivers, E., Balokovic, M., Arevalo, P., Bauer, F.E., Boggs, S.E., Brandt, W.N., Brightman, M., Christensen, F.E., Criag, W.W., Gandhi, P., Hailey, C.J., Harrison, F., Koss, M., Ricci, C., Stern, D., Walkton, D.J. and Zhang, W.W. (2015) The NuSTAR view of reflection and absorption in NGC 7582. The Astrophysical Journal, 815 (55), 1-9. (doi:10.1088/0004-637X/815/1/55).

Record type: Article

Abstract

NGC 7582 is a well-studied X-ray bright Seyfert 2 with moderately heavy (NH ~ 1023 - 1024 cm-2), highly variable absorption and strong reflection spectral features. The spectral shape changed around the year 2000, dropping in observed flux and becoming much more highly absorbed. Two scenarios have been put forth to explain this spectral change: (1) the central X-ray source partially "shut off" around this time, decreasing in intrinsic luminosity, with a delayed decrease in reflection features due to the light-crossing time of the Compton-thick material or (2) the source became more heavily obscured, with only a portion of the power law continuum leaking through. NuSTAR observed NGC 7582 twice in 2012, two weeks apart, in order to quantify the reflection using high-quality data above 10 keV. We find that the most plausible scenario is that NGC 7582 has recently become more heavily absorbed by a patchy torus with a covering fraction of ~80%–90% and an equatorial column density of ~ 3 ×1024 cm-2. We find the need for an additional highly variable full-covering absorber with NH = (4–6) × 1023 cm-2 in the line of sight, possibly associated with a hidden broad line region.

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More information

Accepted/In Press date: 5 November 2015
Published date: 9 December 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 400035
URI: http://eprints.soton.ac.uk/id/eprint/400035
ISSN: 1538-4357
PURE UUID: 88246909-83a2-4732-80e3-cdbeedb53475
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 08 Sep 2016 08:50
Last modified: 03 Dec 2019 01:34

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Contributors

Author: E. Rivers
Author: M. Balokovic
Author: P. Arevalo
Author: F.E. Bauer
Author: S.E. Boggs
Author: W.N. Brandt
Author: M. Brightman
Author: F.E. Christensen
Author: W.W. Criag
Author: P. Gandhi ORCID iD
Author: C.J. Hailey
Author: F. Harrison
Author: M. Koss
Author: C. Ricci
Author: D. Stern
Author: D.J. Walkton
Author: W.W. Zhang

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