Lag variability of GRS 1915+105 during Plateau States

Broja G. Dutta1,3*, Partha Sarathi Pal2 and Sandip K. Chakrabarti2,3
1Department of Physics, RBC College, Naihati, W.B, 743165, India
2S. N. Bose National Centre For Basic Sciences, Kolkata, 700098, India
3Indian Centre for Space Physics, Kolkata, 700084, India

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Abstract

The evolution of Time-lags are correlated with the accretion geometry during Plateau states of GRS 1915+105. We find that the lag spectrum for the χ3 class is different from that of χ1, χ2 and χ4 classes. Hard lags occur only when Comptonizing efficiency (CE) ≥ 0.9% for different plateau states and its evolution confirm the sequence of class transitions suggested on the basis of CE parameter. We concluded the variation of time lags could be due to the movement of CENBOL.

Fig. 1 Fig. 2


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Keywords : black hole physics – accretion discs – X-rays: binaries – radiative transfer