SIGMA observations of X-ray Nova Velorum 1993 (GRS 1009-45)

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dc.creatorGoldoni, P.
dc.creatorVargas, M.
dc.creatorGoldwurm, A.
dc.creatorLaurent, P.
dc.creatorRoques, J. -P.
dc.creatorJourdain, E.
dc.creatorMalzac, J.
dc.creatorVedrenne, G.
dc.creatorRevnivtsev, M.
dc.creatorChurazov, E.
dc.creatorGilfanov, M.
dc.creatorSunyaev, R.
dc.creatorDyachkov, A.
dc.creatorKhavenson, N.
dc.creatorTserenin, I.
dc.creatorKuleshova, N.
dc.date1997-09-10
dc.date.accessioned2026-07-07T02:24:10Z
dc.date.available2026-07-07T02:24:10Z
dc.descriptionWe 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.
dc.description4 pages LaTeX, 2 postscript figures, Accepted by Astronomy and AstroPhysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9709089
dc.identifierhttp://arxiv.org/abs/astro-ph/9709089
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11521
dc.subjectAstrophysics
dc.titleSIGMA observations of X-ray Nova Velorum 1993 (GRS 1009-45)
dc.typetext

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