Accretion disc spectrum in presence of mass outflow around black holes

Samir Mandal1*,Rajiv Kumar2and Indranil Chattopadhyay2
1IIST, Valiamala, Thiruvananthapuram - 695547, Kerala, India
2ARIES, Manora Peak, Nainital - 263002, India

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Abstract

We study the effect of mass outflow on the accretion disc spectrum in presence of heating and cooling processes. Radiation spectrum shows a softening of spectral index in presence of mass outflow. This can explain the state transition of outbursting as well as persistent galactic black hole candidates, in particular when the sources are in hard or intermediate states.

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Keywords : black hole physics – accretion, accretion discs – radiation mechanisms: general – outflows