Skip to main content Accessibility help
×
Home
Hostname: page-component-6f6fcd54b-pzg5m Total loading time: 0.157 Render date: 2021-05-10T22:08:38.472Z Has data issue: true Feature Flags: {}

Sigma Observations of the Galactic Centre

Published online by Cambridge University Press:  30 March 2016

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

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
Copyright
Copyright © Kluwer 1992

References

[1] Lacy, J.H. et al., 1980, Apj, 241, 132 CrossRefGoogle Scholar
[2] Lingelfelter, R.E. and Ramaty, R., 1989, Apj, 343, 686 CrossRefGoogle Scholar
[3] Skinner, G.K. et.al, 1987, Nature, 330, 544 CrossRefGoogle Scholar
[4] Paul, J. et.al, 1990, Adv.Sp.Res. 11,8, 289 CrossRefGoogle Scholar
[5] Cordier, B. et al., 1990, Adv.Sp.Res. 11, 8, 169 CrossRefGoogle Scholar
[6] Paul, J. et al., 1990, in Gamma-Ray Line Astrophysics, AIP:NY, in pressGoogle Scholar
[7] Barret, D. et al., 1991, Apj (letters) in pressGoogle Scholar
[8] Denis, M. et al., 1991, ICRC, Dublin OG 3.3.6 Google Scholar
[9] Barret, D. et al., in preparationGoogle Scholar
[10] Skinner, G.K. et al., 1990, in Gamma-Ray Line Astrophysics, AIP:NY, in pressGoogle Scholar
[11] Sunyaev, R. and Titarchuk, L, 1980, A&A, 86, 121 Google Scholar
[12] Salotti, et al., 1991, A&A, in pressGoogle Scholar
[13] Bouchet, et al., 1991, submitted to ApJGoogle Scholar
[14] Sunyaev, R. et al., 1991, submitted to ApJGoogle Scholar
[15] Sunyaev, R. et al., 1991, A&A, in pressGoogle Scholar
You have Access

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Sigma Observations of the Galactic Centre
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Sigma Observations of the Galactic Centre
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Sigma Observations of the Galactic Centre
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *