‘Q’ factors in Galactic Black Hole Sources – A case study of 1999 outburst of XTE J1859+226

A. Nandi1*, S. Mandal2, S. Das3 and I. Chattopadhyay4
1Space Astronomy Group, SSIF/ISITE Campus, ISRO Satellite Centre, Bangalore, India
2Indian Institute of Space Science and Technology, Trivandrum, India
3Indian Institute of Technology Guwahati, Guwahati, India
4ARIES, Manora Peak, Naintal, India

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Abstract

The outburst profile of Galactic Black Hole (GBH) sources follow a typical Q-diagramin the hardness-intensity (HI) plane. The evolution of Quasi-Periodic Oscillation (QPO) frequencies, QPO-rms and ejection of transient-jets are associated with different and distinct branches of HI diagram. The Q-diagram, QPO evolution, transient-jet etc. are termed as ‘Q’ factors of GBH sources. In this work, we outline the framework to understand these observational features from a single paradigm of accretion disk model and attempt to model the outburst properties of XTE J1859+226 BH source for its 1999 outburst as a representative case.

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