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The AGN nature of three INTEGRAL sources: IGR J18249–3243, IGR J19443+2117, and IGR J22292+6647

The AGN nature of three INTEGRAL sources: IGR J18249–3243, IGR J19443+2117, and IGR J22292+6647
The AGN nature of three INTEGRAL sources: IGR J18249–3243, IGR J19443+2117, and IGR J22292+6647
Context: The third INTEGRAL/IBIS survey has revealed several new hard X-ray sources, which are still unidentified or unclassified. To identify these sources, we need to find their counterparts at other wavelengths and then study their nature.

Aims: The aim of this work is to employ the capability of the X-ray telescope (XRT) onboard Swift to localise the sources with a positional accuracy of few arcseconds, thus allowing the search for optical/UV, infrared, and radio counterparts to be more efficient and reliable. A second objective is to provide spectral information over a broad range of frequencies.

Methods: We analysed all XRT observations available for three unidentified INTEGRAL sources, IGR J18249–3243, IGR J19443+2117, and IGR J22292+6647, localised their soft X-ray counterparts, and searched for associations with objects in the radio band. We also combined X-/gamma-ray data, as well as all the available radio, infrared, and optical/UV information, in order to provide a broad-band spectral characterisation of each source and investigate its nature.

Results: In all three cases, XRT observations provided a firm localisation of the X-ray counterpart and information on its optical/UV, infrared, and radio associations. All three sources are found to be bright and repeatedly observed radio objects, although poorly studied. The X-/gamma-ray spectrum of each source is described well by power laws with the photon indices typical of AGN; however, only IGR J19443+2117 may have absorption in excess of the Galactic value, while IGR J22292+6647 is certainly variable at X-ray energies. IGR J18249–3243 has a complex radio morphology and a steep radio spectrum, while the other two sources show flatter radio spectra and a more compact morphology. Overall, their radio, optical/UV, and infrared characteristics, as well as their X-/gamma-ray properties, point to an AGN classification for all three objects.
gamma rays: observations, x-rays: galaxies, galaxies: active, galaxies: individual: IGR J18249–3243, galaxies: individual: IGR J19443+2117, galaxies: individual: IGR J22292+6647
0004-6361
893-898
Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
Stephen, J.B.
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Masetti, N.
78166fad-2a82-4de5-9359-25706c0a6e2f
Grupe, D.
c5c55483-6653-4a69-805d-1a4c6c49c2bc
Capitanio, F.
573142d2-8f35-4c9e-830e-6b988fec31d6
Bird, Anthony J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, Anthony J.
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Fiocchi, M.
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Gehrels, N.
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Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Masetti, N.
78166fad-2a82-4de5-9359-25706c0a6e2f
Grupe, D.
c5c55483-6653-4a69-805d-1a4c6c49c2bc
Capitanio, F.
573142d2-8f35-4c9e-830e-6b988fec31d6
Bird, Anthony J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, Anthony J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Fiocchi, M.
74d63e71-f43d-494b-92ee-07dc83d18de1
Gehrels, N.
4f9b1856-893c-41a0-89a0-ba9e25aacf65

Landi, R., Stephen, J.B., Masetti, N., Grupe, D., Capitanio, F., Bird, Anthony J., Dean, Anthony J., Fiocchi, M. and Gehrels, N. (2009) The AGN nature of three INTEGRAL sources: IGR J18249–3243, IGR J19443+2117, and IGR J22292+6647. Astronomy & Astrophysics, 493 (3), 893-898. (doi:10.1051/0004-6361:200810503).

Record type: Article

Abstract

Context: The third INTEGRAL/IBIS survey has revealed several new hard X-ray sources, which are still unidentified or unclassified. To identify these sources, we need to find their counterparts at other wavelengths and then study their nature.

Aims: The aim of this work is to employ the capability of the X-ray telescope (XRT) onboard Swift to localise the sources with a positional accuracy of few arcseconds, thus allowing the search for optical/UV, infrared, and radio counterparts to be more efficient and reliable. A second objective is to provide spectral information over a broad range of frequencies.

Methods: We analysed all XRT observations available for three unidentified INTEGRAL sources, IGR J18249–3243, IGR J19443+2117, and IGR J22292+6647, localised their soft X-ray counterparts, and searched for associations with objects in the radio band. We also combined X-/gamma-ray data, as well as all the available radio, infrared, and optical/UV information, in order to provide a broad-band spectral characterisation of each source and investigate its nature.

Results: In all three cases, XRT observations provided a firm localisation of the X-ray counterpart and information on its optical/UV, infrared, and radio associations. All three sources are found to be bright and repeatedly observed radio objects, although poorly studied. The X-/gamma-ray spectrum of each source is described well by power laws with the photon indices typical of AGN; however, only IGR J19443+2117 may have absorption in excess of the Galactic value, while IGR J22292+6647 is certainly variable at X-ray energies. IGR J18249–3243 has a complex radio morphology and a steep radio spectrum, while the other two sources show flatter radio spectra and a more compact morphology. Overall, their radio, optical/UV, and infrared characteristics, as well as their X-/gamma-ray properties, point to an AGN classification for all three objects.

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More information

Published date: 3 January 2009
Keywords: gamma rays: observations, x-rays: galaxies, galaxies: active, galaxies: individual: IGR J18249–3243, galaxies: individual: IGR J19443+2117, galaxies: individual: IGR J22292+6647

Identifiers

Local EPrints ID: 144793
URI: http://eprints.soton.ac.uk/id/eprint/144793
ISSN: 0004-6361
PURE UUID: c8d08af9-efd4-45bc-9673-c282104728b5
ORCID for Anthony J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 24 May 2010 12:02
Last modified: 09 Nov 2021 02:44

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Contributors

Author: R. Landi
Author: J.B. Stephen
Author: N. Masetti
Author: D. Grupe
Author: F. Capitanio
Author: Anthony J. Bird ORCID iD
Author: Anthony J. Dean
Author: M. Fiocchi
Author: N. Gehrels

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