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GRO J0422+32〔() SIMBAD〕 is an X-ray nova and black hole candidate that was discovered by the BATSE instrument on the CGRO satellite on 5 August 1992.〔Harmon, A. et al. (1992) IAUC 5584〕〔Paciesas, W. et al. (1992), IAUC 5594〕 During outburst, it was observed to be stronger than the Crab Nebula gamma-ray source out to photon energies of about 500 keV. The mass of the black hole in GRO J0422+32 falls in the range 3.66 to 4.97 solar masses.〔http://adsabs.harvard.edu/abs/2003ApJ...599.1254G〕 This is the smallest yet found for any stellar black hole, and near the theoretical upper mass limit (~2.7 ) for a neutron star. Further analysis in 2012 calculated a mass of 2.1 , which raises questions as to what the object actually is. Position (J2000) is RA 04 h 21 m 42.77 s +32 deg 54' 26.7".〔McCroskey et al., IAUC 5594, 1992〕〔Castro-Tirado, A. J. ''et al.'' (1993), ''Astron.&Astrophys'', "Discovery of the optical counterpart of the soft X-ray transient GRO J0422+32", vol. 276, no2, pp. L37-L40〕 It is identified with an M1V variable star, V518 Per,〔General Catalogue of Variable Stars, 3rd ed. (1971) Moscow〕 in the constellation Perseus, with magnitudes 13.5 in the B spectral band, and 13.2 in V. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GRO J0422+32」の詳細全文を読む スポンサード リンク
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