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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
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.

Type
Contributed Papers
Copyright
2006 International Astronomical Union