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Sigma Observations of the Galactic Centre

Published online by Cambridge University Press:  30 March 2016

B. Cordier ,
J. Ballet ,
A. Goldwurm ,
J. Paul ,
L. Bouchet ,
J.P. Roques ,
P. Mandrou ,
G. Vedrenne ,
R. Sunyaev  and
E. Churazov
...Show all authors
B. Cordier
Affiliation:
Service d’Astrophysique, Centre d’Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France
J. Ballet
Affiliation:
Service d’Astrophysique, Centre d’Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France
A. Goldwurm
Affiliation:
Service d’Astrophysique, Centre d’Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France
J. Paul
Affiliation:
Service d’Astrophysique, Centre d’Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France
L. Bouchet
Affiliation:
Centre d’Etude Spatiale des Rayonnements, 9 Ave. Colonel Roche, 31029 Toulouse Cedex, France
J.P. Roques
Affiliation:
Centre d’Etude Spatiale des Rayonnements, 9 Ave. Colonel Roche, 31029 Toulouse Cedex, France
P. Mandrou
Affiliation:
Centre d’Etude Spatiale des Rayonnements, 9 Ave. Colonel Roche, 31029 Toulouse Cedex, France
G. Vedrenne
Affiliation:
Centre d’Etude Spatiale des Rayonnements, 9 Ave. Colonel Roche, 31029 Toulouse Cedex, France
R. Sunyaev
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
E. Churazov
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
M. Gilfanov
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
A. Diachkov
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
N. Khavenson
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
I. Chulkov
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
A. Kuznetzov
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR
B. Novikov
Affiliation:
Space Research Institute, USSR Academy of Sciences, Profsouznaya 81/32, 117296 Moscow, USSR

Abstract

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After the first year of performance of SIGMA, more than 390 hours of data on the Galactic Centre region have been recorded. This survey establishes the extremely variable nature of this region. During a period of 6 months, 3 sources have dominated successively: 1E 1740.7-2942, GRS 1758-258, GX1 + 4. Concerning the two first sources, their spectral shape and their variability suggest to include them in the list of the black hole candidates.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 9: Highlights of Astronomy. As presented at the XXIst General Assembly of the IAU, 1991 , 1992 , pp. 217 - 221
Copyright
Copyright © Kluwer 1992

References

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