Comptonizing Efficiency – A Mass Independent Dynamic Hardness Ratio

P. S. Pal1*and S. K. Chakrabarti1,2
1S. N. Bose National Centre For Basic Sciences, Block-JD, Salt lake, Kolkata-700098, India
2Indian Centre For Space Physics, 43 Chalantika, Garia Station Road, Kolkata-700084, India

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Abstract

Comptonizing Efficiency (CE), which is ratio of Comptonized hard photons and injected soft photons with dynamically determined energy ranges, is likely to be black hole mass independent. Whereas traditional Hardness Ratio, with fixed energy ranges, have failed to show mass independence. We demonstrate this by computing color-color diagram and CE for IGR 17091-3624 and GRS 1915+105.

Fig. 1 Fig. 2


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Keywords : black hole physics – accretion disc – X-rays: binaries – radiation mechanisms: general