SIGMA/[ITAL]GRANAT[/ITAL] Discovery of GRS 1739−278, A Hard X-Ray Transient in the Galactic Bulge
1997; IOP Publishing; Volume: 476; Issue: 1 Linguagem: Inglês
10.1086/310489
ISSN1538-4357
AutoresM. L. García-Vargas, A. Goldwurm, Philippe Laurent, J. Paul, E. Jourdain, J. P. Roques, V. Borrel, L. Bouchet, R. Sunyaev, E. Churazov, M. Gilfanov, B. Novikov, A. Dyachkov, N. Khavenson, K. G. Sukhanov, N. Kuleshova,
Tópico(s)Geological and Geochemical Analysis
ResumoWhile the SIGMA telescope performed its twelfth observing campaign on the Galactic center region, a new hard X-ray transient source was discovered. The source, named GRS 1739-278, was bright during the whole campaign with a hard spectrum. Thanks to the accurate position provided by the coded-mask imaging technique, the GRS 1739-278 counterparts at other wavelengths have been promptly identified. The collected observations and similarities of the source behaviors with those of Nova Muscae 1991 suggest that GRS 1739-278 may contain a black hole located in the Galactic bulge. The fact that the hard X-ray peak luminosity of GRS 1739-278 is similar to that of GRS 1730-312 (another hard X-ray transient observed by SIGMA in the bulge) leads us to consider the hard X-ray transient peak luminosity as a possible distance indicator.
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