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The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL*

The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL*
The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL*
Aims: we aim to measure the physical properties of the hot X-ray corona of two active galactic nuclei, NGC 4388 and NGC 2110.

Methods: we analysed the hard X-ray (20–300 keV) INTEGRAL spectrum in conjunction with archival XMM–Newton and NuSTAR
data.

Results: the X-ray spectrum of both sources is phenomenologically well described by an absorbed cut-off power law. In agreement with previous results, we find no evidence of a Compton reflection component in these sources. We obtain a high-energy cut-off of 200+75 −40 keV for NGC 4388 and 320+100 −60 keV for NGC 2110. A fit with a thermal Comptonisation model yields a coronal temperature of 80+40 −20 keV and 75+20 −15 keV, respectively, and an optical depth of approximately two, assuming a spherical geometry. The coronal temperature and luminosity of both sources are consistent with pair production that acts as a thermostat for the thermal plasma. These results emphasise the importance of good signal-to-noise X-ray data above 100 keV to probe the high-energy emission of AGNs.
0004-6361
Ursini, F.
731ff388-d0a4-44dc-bc8e-595f9a376255
Bassani, L.
a36dbb20-53f2-4941-beb3-7afe7cb29a02
Malizia, A.
d2120b69-7f7a-4ac7-895c-727c47419567
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Stephen, J.B.
efbe402b-ee1e-4073-8da4-227ce8b3a346
Ubertini, P.
4e2d0b81-a5ad-4ef6-9278-6af29fff69a8
Ursini, F.
731ff388-d0a4-44dc-bc8e-595f9a376255
Bassani, L.
a36dbb20-53f2-4941-beb3-7afe7cb29a02
Malizia, A.
d2120b69-7f7a-4ac7-895c-727c47419567
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Stephen, J.B.
efbe402b-ee1e-4073-8da4-227ce8b3a346
Ubertini, P.
4e2d0b81-a5ad-4ef6-9278-6af29fff69a8

Ursini, F., Bassani, L., Malizia, A., Bazzano, A., Bird, A.J., Stephen, J.B. and Ubertini, P. (2019) The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL*. Astronomy & Astrophysics, 629, [A54]. (doi:10.1051/0004-6361/201936273).

Record type: Article

Abstract

Aims: we aim to measure the physical properties of the hot X-ray corona of two active galactic nuclei, NGC 4388 and NGC 2110.

Methods: we analysed the hard X-ray (20–300 keV) INTEGRAL spectrum in conjunction with archival XMM–Newton and NuSTAR
data.

Results: the X-ray spectrum of both sources is phenomenologically well described by an absorbed cut-off power law. In agreement with previous results, we find no evidence of a Compton reflection component in these sources. We obtain a high-energy cut-off of 200+75 −40 keV for NGC 4388 and 320+100 −60 keV for NGC 2110. A fit with a thermal Comptonisation model yields a coronal temperature of 80+40 −20 keV and 75+20 −15 keV, respectively, and an optical depth of approximately two, assuming a spherical geometry. The coronal temperature and luminosity of both sources are consistent with pair production that acts as a thermostat for the thermal plasma. These results emphasise the importance of good signal-to-noise X-ray data above 100 keV to probe the high-energy emission of AGNs.

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The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL* - Accepted Manuscript
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Accepted/In Press date: 2 August 2019
e-pub ahead of print date: 4 September 2019
Published date: September 2019

Identifiers

Local EPrints ID: 433823
URI: http://eprints.soton.ac.uk/id/eprint/433823
ISSN: 0004-6361
PURE UUID: 799b3bbc-1b2b-4de5-aa3a-cd69cff79630
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

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Date deposited: 04 Sep 2019 16:30
Last modified: 26 Nov 2021 02:36

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Contributors

Author: F. Ursini
Author: L. Bassani
Author: A. Malizia
Author: A. Bazzano
Author: A.J. Bird ORCID iD
Author: J.B. Stephen
Author: P. Ubertini

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