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The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies

The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies
The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies
Aim: the 0.5-150 keV broad-band spectra of a sample of nine bright type 1 Seyfert galaxies are analyzed here. These sources have been discovered/detected by INTEGRAL and subsequently observed with XMM-Newton for the first time with high sensitivity below 10 keV. The sample, although small, is representative of the population of type 1 AGN which are now being observed above 20 keV.

Methods: the intrinsic continuum has been modeled using three different parameterizations: a power-law model, an exponential cut-off power-law and an exponential cut-off power-law with a Compton reflection component. In each model the presence of intrinsic absorption, a soft component and emission line reprocessing features has also been tested.

Results: a simple power-law model is a statistically good description of most of the spectra presented here; an FeK line, fully and/or partial covering absorption and a soft spectral component are detected in the majority of the sample sources. The average photon index ( ) is consistent, within errors, with the canonical spectral slope often observed in AGN although the photon index distribution peaks in our case at flat (~1.5) values. For four sources, we find a significantly improved fit when the power-law is exponentially cut-off at an energy which is constrained to be below ~150 keV. The Compton reflection parameter could be estimated in only two objects of the sample and in both cases is found to be R > 1.
galaxies: seyfert, x-rays: galaxies
0004-6361
151-160
Panessa, F.
ea57d0af-2ad5-4f65-a8f7-b001e70ebe13
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
De Rosa, A.
b2a68e71-5c23-4649-94f0-1d8ffd40bb77
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Fiocchi, M.
74d63e71-f43d-494b-92ee-07dc83d18de1
Malizia, A.
efa63850-cf26-482c-ae3b-54b0c8fb8a87
Molina, M.
28a3f3b6-aedf-4fa5-9a4f-dbcba001435d
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Walter, R.
ca141f43-45f4-408a-a4f2-7cac51552458
Panessa, F.
ea57d0af-2ad5-4f65-a8f7-b001e70ebe13
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
De Rosa, A.
b2a68e71-5c23-4649-94f0-1d8ffd40bb77
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Fiocchi, M.
74d63e71-f43d-494b-92ee-07dc83d18de1
Malizia, A.
efa63850-cf26-482c-ae3b-54b0c8fb8a87
Molina, M.
28a3f3b6-aedf-4fa5-9a4f-dbcba001435d
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Walter, R.
ca141f43-45f4-408a-a4f2-7cac51552458

Panessa, F., Bassani, L., De Rosa, A., Bird, A.J., Dean, A.J., Fiocchi, M., Malizia, A., Molina, M., Ubertini, P. and Walter, R. (2008) The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies. Astronomy & Astrophysics, 483 (1), 151-160. (doi:10.1051/0004-6361:20078657).

Record type: Article

Abstract

Aim: the 0.5-150 keV broad-band spectra of a sample of nine bright type 1 Seyfert galaxies are analyzed here. These sources have been discovered/detected by INTEGRAL and subsequently observed with XMM-Newton for the first time with high sensitivity below 10 keV. The sample, although small, is representative of the population of type 1 AGN which are now being observed above 20 keV.

Methods: the intrinsic continuum has been modeled using three different parameterizations: a power-law model, an exponential cut-off power-law and an exponential cut-off power-law with a Compton reflection component. In each model the presence of intrinsic absorption, a soft component and emission line reprocessing features has also been tested.

Results: a simple power-law model is a statistically good description of most of the spectra presented here; an FeK line, fully and/or partial covering absorption and a soft spectral component are detected in the majority of the sample sources. The average photon index ( ) is consistent, within errors, with the canonical spectral slope often observed in AGN although the photon index distribution peaks in our case at flat (~1.5) values. For four sources, we find a significantly improved fit when the power-law is exponentially cut-off at an energy which is constrained to be below ~150 keV. The Compton reflection parameter could be estimated in only two objects of the sample and in both cases is found to be R > 1.

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More information

Published date: 3 May 2008
Keywords: galaxies: seyfert, x-rays: galaxies

Identifiers

Local EPrints ID: 144815
URI: http://eprints.soton.ac.uk/id/eprint/144815
ISSN: 0004-6361
PURE UUID: bc83788f-d510-41a7-bc35-00e52b359d40
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 24 May 2010 14:20
Last modified: 09 Nov 2021 02:44

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Contributors

Author: F. Panessa
Author: L. Bassani
Author: A. De Rosa
Author: A.J. Bird ORCID iD
Author: A.J. Dean
Author: M. Fiocchi
Author: A. Malizia
Author: M. Molina
Author: P. Ubertini
Author: R. Walter

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