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SIGMA observations of the bright X-ray transient Nova Persei: A new black hole candidate?
Roques, J. P.; Bouchet, L.; Jourdain, E.; Mandrou, P.; Goldwurm, A.; Ballet, J.; Claret, A.; Lebrun, F.; Finoguenov, A.; Churazov, E.; Gilfanov, M.; Sunyaev, R.; Novikov, B.; Chulkov, I.; Kuleshova, N.; Tserenin, I.
AA(Centre d'Étude spatiale des Rayonnements, Toulouse, France), AB(Centre d'Étude spatiale des Rayonnements, Toulouse, France), AC(Centre d'Étude spatiale des Rayonnements, Toulouse, France), AD(Centre d'Étude spatiale des Rayonnements, Toulouse, France), AE(CEN de Saclay, Gif-sur-Yvette, France), AF(CEN de Saclay, Gif-sur-Yvette, France), AG(CEN de Saclay, Gif-sur-Yvette, France), AH(CEN de Saclay, Gif-sur-Yvette, France), AI(Space Research Institute, Moscow, Russia), AJ(Space Research Institute, Moscow, Russia)
The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 451-454 (ApJS Homepage)
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NASA/STI Keywords:
Black Holes (Astronomy), Gamma Ray Astronomy, Gamma Ray Spectra, Novae, Stellar Spectra, X Ray Sources, Gamma Ray Bursts, Light Curve, Periodic Variations
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Nova Persei (GRO J0422+32 = GRS 0418+328) has been observed by the SIGMA telescope (35-1300 keV) between 1992 August 15 and September 25 and is located at R.A. (1950) = 04(h) 18(m) 28.6(s), decl. (1950) = 32 deg 47 min 20 sec. This source can be classified as a X-ray transient. It was found to be extremely bright (3 Crab in the 35-200 keV band) and to have a hard spectrum (photon power-law index of about 2) extending up to 600 keV. Quasi-periodic oscillations have been detected around 0.03 and 0.3 Hz. The behavior of this object in the high-energy domain leads us to consider it as a new black hole candidate.

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