SIGMA observations of X-ray Nova Velorum 1993 (GRS 1009-45)
Goldoni, P. · Vargas, M. · Goldwurm, A. · Laurent, P. · Roques, J. -P. · Jourdain, E. · Malzac, J. · Vedrenne, G. · Revnivtsev, M. · Churazov, E. · Gilfanov, M. · Sunyaev, R. · Dyachkov, A. · Khavenson, N. · Tserenin, I. · Kuleshova, N.
Original · EN
We report on hard X-ray observations of X-ray Nova Velorum 1993 (GRS 1009-45) performed with the SIGMA coded mask X-ray telescope in January 1994. The source was clearly detected with a flux of about 60 mCrab in the 40-150 keV energy band during the two observations with a hard spectrum (alpha - 1.9) extending up to 150 keV. These observations confirm the duration of the activity of the source in hard X-rays over 100 days after the first maximum and suggest a spectral hardening which has already been observed in Nova Muscae. These and other characteristics found in these observations strengthen the case for this Nova to be a black hole candidate similar to Nova Muscae.
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