Comptonizing Efficiencies of IGR 17091-3624 and its similarity to GRS 1915+105

Abstract

Variability classes in the enigmatic black hole candidate GRS 1915+105 are known to be correlated with the variation of the Comptonizing Efficiency (CE) which is defined to be the ratio between the number of power-law (hard) photons and seed (soft) photons injected into the Compton cloud. Similarities of light curves of several variability classes of GRS 1915+105 and IGR 17091-3624, some of which are already reported in the literature, motivated us to compute CE for IGR 17091-3624 as well. We find that they are similar to what were reported earlier for GRS 1915+105, even though masses of these objects could be different. The reason is that the both the sizes of the sources of the seed photons and of the Comptonizing corona scale in the same way as the mass of the black hole. This indicates that characterization of variability classes based on CE is likely to be black hole mass independent, in general.

This paper is revised version of 1501.01729v1. arXiv:1508.01283 is withdrawn and resubmitted as 1501.01729v2

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• Evolution of Accretion Disc Geometry of GRS~1915+105 during its $\chi$ state as revealed by TCAF solution
• Accretion Flow Properties of GRS 1915+105 During Its $\theta$ Class Using AstroSat Data
• Spectral Analysis of $\chi$ Class Data of GRS 1915+105 Using TCAF Solution
• Similarities and Differences in Accretion Flow Properties between GRS 1915+105 and IGR J17091-3624: a Case Study
• Spectral signature of mass outflow in Two Component Advective Flow Paradigm