Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-04
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure. Accepted for publication on A&A (including new A&A macro)
Scientific paper
10.1051/0004-6361:20010490
We report on BeppoSAX observations of five transient black hole candidates during their quiescent phase. We confirm these sources are X-ray faint, improving on and complementing existing upper limits. We derive 1-10 keV upper limits for GRO J0422+32, GRS 1009-45, 4U 1630-47 and XTE J1748-288, which range from 2x10^32 erg/s to 5x10^34 erg/s. We positively detect GS 2023+338. Its X-ray spectrum can be fit by a power law (photon index Gamma=1.9) or a thermal bremsstrahlung (with kT= 7$ keV), converting in both cases to a 1-10 keV unabsorbed luminosity of ~10^33 erg/s. These values are comparable to the ones derived during an ASCA observation in 1994, indicating that the source remains stable over a ~5 yr baseline.
Campana Sergio
Parmar Arvind N.
Stella Luigi
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