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Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution

Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution
Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution
INTEGRAL is the first gamma-ray astronomy mission with a sufficient sensitivity and angular resolution combination appropriate to the detection and identification of considerable numbers of gamma-ray emitting sources. The large field of view (~30° zero response FWHM) enables INTEGRAL to survey the galactic plane on a regular (~weekly) basis as part of the core programme. The first source catalogue, based on the 1st year of core programme data (~5 Ms) has been completed and published (Bird et al. 2004, ApJ, 607, L33). It contained 123 ϒ-ray sources (24 HMXB, 54 LMXB, 28 "unknown", plus 17 others) - sufficient numbers for a reasonable statistical analysis of their global properties. These were located to a positional accuracy of typically 0.72 arcmin. The detection of previously unknown ϒ-ray emitting sources generally exhibiting high intrinsic absorption, which do not have readily identifiable counterparts at other wavelengths, is intriguing. The substantial fraction (roughly 20% of the total number) of unclassified ϒ-ray sources suggests they must constitute a significant family of objects. In this paper we review the global characteristics of the known galactic sources as well as the unclassified objects with the twin aims of investigating how the unclassified set may fit into stellar evolution and improving our understanding of known X-ray binary systems through the non-thermal ϒ-ray channel. In the context of the known systems we are very conscious that they constitute a ϒ-ray selected set, and may exhibit subtle generic differences to the rest of the class. We present Log(N)-Log(S) distributions, angular distributions, and for systems with reliable distance estimates the spatial distributions within the Galaxy and luminosity functions. For the unknown sources, this statistical analysis has shown that they are most likely to be HMXBs containing a highly magnetised neutron star. The lack of X-ray counterparts for these sources indicates a high degree of intrinsic obscuration.
gamma-rays: observations, x-rays: binaries, galaxy: general, galaxy: structure, galaxy: stellar content
0004-6361
485-494
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Bazzano, A.
6895fd67-4936-4d13-b934-d34a1ff9fedb
Hill, A.B
b7eb0ab0-8912-42e1-823d-640071123280
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Barlow, E.
b665923b-d68b-4962-a21d-f6677459983e
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Lebrun, F.
3199bd6d-2853-421c-b9ac-a1169dbda400
Squera, V.
a804330e-b33b-4220-b053-0c368399e787
Shaw, S.E.
65776027-991a-45ae-8338-e1c73909ce64
Ubertihni, P.
f5ac7599-64fd-4fb1-8f59-72646a01754c
Walter, R.
ca141f43-45f4-408a-a4f2-7cac51552458
Willis, D.
23e073d9-f1be-4fe6-8036-7d9a32130630
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Bazzano, A.
6895fd67-4936-4d13-b934-d34a1ff9fedb
Hill, A.B
b7eb0ab0-8912-42e1-823d-640071123280
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Barlow, E.
b665923b-d68b-4962-a21d-f6677459983e
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Lebrun, F.
3199bd6d-2853-421c-b9ac-a1169dbda400
Squera, V.
a804330e-b33b-4220-b053-0c368399e787
Shaw, S.E.
65776027-991a-45ae-8338-e1c73909ce64
Ubertihni, P.
f5ac7599-64fd-4fb1-8f59-72646a01754c
Walter, R.
ca141f43-45f4-408a-a4f2-7cac51552458
Willis, D.
23e073d9-f1be-4fe6-8036-7d9a32130630

Dean, A.J., Bazzano, A., Hill, A.B, Stephen, J.B., Bassani, L., Barlow, E., Bird, A.J., Lebrun, F., Squera, V., Shaw, S.E., Ubertihni, P., Walter, R. and Willis, D. (2005) Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution. Astronomy & Astrophysics, 443 (2), 485-494. (doi:10.1051/0004-6361:20053513).

Record type: Article

Abstract

INTEGRAL is the first gamma-ray astronomy mission with a sufficient sensitivity and angular resolution combination appropriate to the detection and identification of considerable numbers of gamma-ray emitting sources. The large field of view (~30° zero response FWHM) enables INTEGRAL to survey the galactic plane on a regular (~weekly) basis as part of the core programme. The first source catalogue, based on the 1st year of core programme data (~5 Ms) has been completed and published (Bird et al. 2004, ApJ, 607, L33). It contained 123 ϒ-ray sources (24 HMXB, 54 LMXB, 28 "unknown", plus 17 others) - sufficient numbers for a reasonable statistical analysis of their global properties. These were located to a positional accuracy of typically 0.72 arcmin. The detection of previously unknown ϒ-ray emitting sources generally exhibiting high intrinsic absorption, which do not have readily identifiable counterparts at other wavelengths, is intriguing. The substantial fraction (roughly 20% of the total number) of unclassified ϒ-ray sources suggests they must constitute a significant family of objects. In this paper we review the global characteristics of the known galactic sources as well as the unclassified objects with the twin aims of investigating how the unclassified set may fit into stellar evolution and improving our understanding of known X-ray binary systems through the non-thermal ϒ-ray channel. In the context of the known systems we are very conscious that they constitute a ϒ-ray selected set, and may exhibit subtle generic differences to the rest of the class. We present Log(N)-Log(S) distributions, angular distributions, and for systems with reliable distance estimates the spatial distributions within the Galaxy and luminosity functions. For the unknown sources, this statistical analysis has shown that they are most likely to be HMXBs containing a highly magnetised neutron star. The lack of X-ray counterparts for these sources indicates a high degree of intrinsic obscuration.

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Submitted date: 25 May 2005
Published date: November 2005
Keywords: gamma-rays: observations, x-rays: binaries, galaxy: general, galaxy: structure, galaxy: stellar content

Identifiers

Local EPrints ID: 37726
URI: http://eprints.soton.ac.uk/id/eprint/37726
ISSN: 0004-6361
PURE UUID: 7c55f612-236e-4b66-9685-a52f84ca14a0
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

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Date deposited: 26 May 2006
Last modified: 17 Dec 2019 02:01

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Contributors

Author: A.J. Dean
Author: A. Bazzano
Author: A.B Hill
Author: J.B. Stephen
Author: L. Bassani
Author: E. Barlow
Author: A.J. Bird ORCID iD
Author: F. Lebrun
Author: V. Squera
Author: S.E. Shaw
Author: P. Ubertihni
Author: R. Walter
Author: D. Willis

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