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The IBIS/ISGRI Survey of the Galactic Plane - Global Characteristics of the Gamma-Ray Sources

Published online by Cambridge University Press:  12 May 2006

A. J. Dean ,
A. Bazzano ,
A. B. Hill ,
J. B. Stephen ,
L. Bassani ,
E. J. Barlow ,
A. J. Bird ,
F. Lebrun ,
V. Sguera  and
S. E. Shaw
...Show all authors
A. J. Dean
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK.
A. Bazzano
Affiliation:
IASF-Rm, INAF, Via Fosso del Cavaliere 100, I-00133 Rome, Italy.
A. B. Hill
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK.
J. B. Stephen
Affiliation:
IASF-Bo, INAF, Via Gobetti 101, I-40129 Bologna, Italy.
L. Bassani
Affiliation:
IASF-Bo, INAF, Via Gobetti 101, I-40129 Bologna, Italy.
E. J. Barlow
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK.
A. J. Bird
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK.
F. Lebrun
Affiliation:
CEA-Saclay, DAPNIA/Service d'Astrophysique, F-91191 Gif sur Yvette Cedex, France.
V. Sguera
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK.
S. E. Shaw
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK. Geneva Observatory, INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1291 Versoix, Switzerland.
P. Ubertini
Affiliation:
IASF-Rm, INAF, Via Fosso del Cavaliere 100, I-00133 Rome, Italy.
R. Walter
Affiliation:
Geneva Observatory, INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1291 Versoix, Switzerland.
D. R. Willis
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK.
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Abstract

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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 enables INTEGRAL to survey the Galactic Plane on a regular ($\sim$weekly) basis as part of the core programme. The first source catalogue, based on the 1st year of core programme data ($\sim$5 Msec) has been completed and published (Bird et al. 2004). It contained 123 $\gamma$-ray sources (24 HMXB, 54 LMXB, 28 “unknown”, plus 17 others) - sufficient numbers for a reasonable statistical analysis of their global properties. The detection of previously unknown $\gamma$-ray emitting sources generally exhibiting high intrinsic absorption, which do not have readily identifiable counterparts at other wavelengths, is intriguing. The substantial fraction of unclassified $\gamma$-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.

Keywords

Gamma-rays: observations – X-rays: binaries – Galaxy: structure – Galaxy: stellar content