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We study the observational signatures of the relativistic slim disc of 10M_sun black hole, in a wide range of mass accretion rate, mdot, dimensionlessspin parameter, a_ast, and viewing angle, i. In general, the innermosttemperature, T_in increases with the increase of i for a fixed value of mdotand a_ast, due to the Doppler effect. However, for i > 50 and mdot > mdot_turn,T_in starts to decrease with the increase of mdot. This is a result ofself-obscuration -- the radiation from the innermost hot part of the disc isblocked by the surrounding cooler part. The value of mdot_turn and thecorresponding luminosities depend on a_ast and i. Such obscuration effectscause an interesting behavior on the disc luminosity (L_disc) -- T_in plane forhigh inclinations. In addition to the standard-disc branch which appears belowmdot_turn and which obeys L_disc propto T_in^4 -relation, another branch abovemdot_turn, which is nearly horizontal, may be observed at luminosities close tothe Eddington luminosity. We show that these features are likely observed in aGalactic X-ray source, GRS 1915+105. We support a high spin parameter (a_ast >0.9) for GRS 1915+105 since otherwise the high value of T_in and small size ofthe emitting region (r_in < 1r_S) cannot be explained.

Inner Disc Obscuration in GRS 1915+105 Based on Relativistic Slim Disc Model