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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/039/01/0005

    • Keywords

       

      Accretion—X-ray binaries—black holes—ISM: jets and outflows—radiation mechanisms.

    • Abstract

       

      We report on our attempt to understand the outbursting profile of Galactic Black Hole sources, keeping in mind the evolution of temporal and spectral features during the outburst. We present results of evolution of quasi-periodic oscillations, spectral states and possible connection with jet ejections during the out burst phase. Further,we attempt to connect the observed X-ray variabilities (i.e., ‘class’/‘structured’ variabilities, similar to GRS 1915$+$105) with spectral states of black hole sources. Towards these studies, we consider three black hole sources that have undergone single (XTE J1859$+$226), a few (IGR J17091$-$3624) and many (GX 339-4) outbursts since the start of $RXTE$ era. Finally, we model the broadband energy spectra (3–150 keV) of different spectral states using $RXTE$ and $NuSTAR$ observations. Results are discussed in the context oftwo-component advective flow model, while constraining the mass of the three black hole sources.

    • Author Affiliations

       

      H. SREEHARI1 2 ANUJ NANDI1 D. RADHIKA3 NIRMAL IYER4 SAMIR MANDAL5

      1. Space Astronomy Group, ISITE Campus, ISRO Satellite Centre, Outer Ring Road, Marathahalli, Bengaluru 560 037, India.
      2. Department of Physics, Indian Institute of Science, Bengaluru 560 012, India.
      3. Department of Physics, Dayananda Sagar University, Bengaluru 560 068, India.
      4. Albanova University Centre, KTH PAP, Stockholm 10691, Sweden.
      5. Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, India.
    • Dates

       
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