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Unveiling the nature of INTEGRAL objects through optical spectroscopy

Unveiling the nature of INTEGRAL objects through optical spectroscopy
Unveiling the nature of INTEGRAL objects through optical spectroscopy
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative counterparts of unidentified or poorly studied INTEGRAL sources in order to determine or at least better assess their nature. This was implemented within the framework of our campaign to reveal the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 29 of these objects are active galactic nuclei (13 of which are of Seyfert 1 type, 15 are Seyfert 2 galaxies and one is possibly a BL Lac object) with redshifts between 0.011 and 0.316, 7 are X-ray binaries (5 with high-mass companions and 2 with low-mass secondaries), one is a magnetic cataclysmic variable, one is a symbiotic star and one is possibly an active star. Thus, the large majority (74%) of the identifications in this sample belongs to the AGN class. When possible, the main physical parameters for these hard X-ray sources were also computed using the multiwavelength information available in the literature. These identifications further underscore the importance of INTEGRAL in studying the hard X-ray spectra of all classes of X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of still unidentified hard X-ray sources.
galaxies: Seyfert, x-rays: binaries, stars: novae, cataclysmic variables, techniques: spectroscopic, x-rays: general
0004-6361
113-132
Masetti, N.
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Mason, E.
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Morelli, L.
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Cellone, S.A.
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McBride, V.A.
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Palazzi, E.
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Bassani, L.
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Bazzano, A.
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Bird, A.J.
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Charles, P.A.
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Dean, A.J.
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Galaz, G.
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Gehrels, N.
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Landi, R.
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Malizia, A.
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Minniti, D.
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Panessa, F.
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Romero, G.E.
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Stephen, J.B.
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Ubertini, P.
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Walter, R.
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Masetti, N.
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Mason, E.
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Morelli, L.
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Cellone, S.A.
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McBride, V.A.
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Palazzi, E.
e9674d6b-8d34-4c1d-8ec0-0dd82392f18b
Bassani, L.
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Bazzano, A.
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Bird, A.J.
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Charles, P.A.
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Dean, A.J.
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Galaz, G.
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Gehrels, N.
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Landi, R.
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Malizia, A.
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Minniti, D.
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Panessa, F.
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Romero, G.E.
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Stephen, J.B.
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Ubertini, P.
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Walter, R.
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Masetti, N., Mason, E., Morelli, L., Cellone, S.A., McBride, V.A., Palazzi, E., Bassani, L., Bazzano, A., Bird, A.J., Charles, P.A., Dean, A.J., Galaz, G., Gehrels, N., Landi, R., Malizia, A., Minniti, D., Panessa, F., Romero, G.E., Stephen, J.B., Ubertini, P. and Walter, R. (2008) Unveiling the nature of INTEGRAL objects through optical spectroscopy. Astronomy & Astrophysics, 482 (1), 113-132. (doi:10.1051/0004-6361:20079332).

Record type: Article

Abstract

Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative counterparts of unidentified or poorly studied INTEGRAL sources in order to determine or at least better assess their nature. This was implemented within the framework of our campaign to reveal the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 29 of these objects are active galactic nuclei (13 of which are of Seyfert 1 type, 15 are Seyfert 2 galaxies and one is possibly a BL Lac object) with redshifts between 0.011 and 0.316, 7 are X-ray binaries (5 with high-mass companions and 2 with low-mass secondaries), one is a magnetic cataclysmic variable, one is a symbiotic star and one is possibly an active star. Thus, the large majority (74%) of the identifications in this sample belongs to the AGN class. When possible, the main physical parameters for these hard X-ray sources were also computed using the multiwavelength information available in the literature. These identifications further underscore the importance of INTEGRAL in studying the hard X-ray spectra of all classes of X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of still unidentified hard X-ray sources.

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Published date: April 2008
Keywords: galaxies: Seyfert, x-rays: binaries, stars: novae, cataclysmic variables, techniques: spectroscopic, x-rays: general

Identifiers

Local EPrints ID: 144817
URI: http://eprints.soton.ac.uk/id/eprint/144817
ISSN: 0004-6361
PURE UUID: bd264b44-9744-4dea-9339-d00eaf3d9c2d
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 24 May 2010 11:23
Last modified: 21 Apr 2020 00:24

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Contributors

Author: N. Masetti
Author: E. Mason
Author: L. Morelli
Author: S.A. Cellone
Author: V.A. McBride
Author: E. Palazzi
Author: L. Bassani
Author: A. Bazzano
Author: A.J. Bird ORCID iD
Author: P.A. Charles
Author: A.J. Dean
Author: G. Galaz
Author: N. Gehrels
Author: R. Landi
Author: A. Malizia
Author: D. Minniti
Author: F. Panessa
Author: G.E. Romero
Author: J.B. Stephen
Author: P. Ubertini
Author: R. Walter

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