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Browsing Publications of Astronomical Society of India by Author "Chakrabarti, S. K"

Browsing Publications of Astronomical Society of India by Author "Chakrabarti, S. K"

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  • Advective flow paradigm of disks and outflows around black holes 
    Chakrabarti, S. K (Astronomical Society of India, 2002)
    For the past fifty years, accretion process is being studied initially on normal stars and later, on compact object, such as black holes and neutron stars. In this Review, I present the modern development of this subject ...
  • Analytical study of standing shocks around black hole 
    Das, S; Chakrabarti, S. K (Astronomical Society of India, 2002)
    Shocks from around black holes as the matter slows down by centifugal barrier. At the shocks, kinetic energy is converted into thermal energy and hard-X rays, outflows etc. are produced which are observed. We compute the ...
  • How Thick are the Saturn's Rings? 
    Chakrabarti, S. K; Bhattacharyya, A (Astronomical Society of India, 2002-09)
    It has been long thought that the rings of saturn are probably not thicker than a few hundreds of meters. By actually following the motion of particles inside the decaying bending waves of the Saturn's rings and matching the ...
  • A recent multi-wavelength campaign to observe the microquasar SS433 
    Chakrabarti, S. K (Astronomical Society of India, 2005-06)
    We present a summary of the recent multiwavelength campaign made in September-October, 2002, to observe SS 433. We used the Giant Meterwave Radio Telescope (GMRT) for radio observation, 1.2 meter Physical Research Laboratory ...
  • Recombination efficiency of molecular hydrogen on interstellar grains and its effect on pro duction of H/sub2/ 
    Acharyya, K; Chakrabarti, S. K (Astronomical Society of India, 2005-12)
    We study the efficiency of molecular hydrogen recombination on grain surfaces using both the rate equation (which tracks the average number of species) and the master equation (which tracks the expectation values of the ...
  • Shocks in winds from accretion discs and the formation of high energy particles 
    Chattopadhyay, I; Chakrabarti, S. K (Astronomical Society of India, 2002)
    We study effects of radiation momentum deposition on jets and outflows from the disks and show that if disks are perturbed, jets could have propagating shock waves which may accelerate particles to observed slopes.
  • Understanding the behavior of energy X-rays from the black hole candidate GRS 1915+105 
    Nandi, A; Chakrabarti, S. K (Astronomical Society of India, 2002)
    Black Hole candidate GRS 1915+105 shows a very interesting behaviour at high energy X-rays. For instance, it shows quasi-Periodic Oscillations (QPO) only at high energies. Also the spectral slopes at high energies vary and ...
  • Wind induced instabilities in accretion flow around black holes 
    Acharya, K; Chakrabarti, S. K; Molteni, D (Astronomical Society of India, 2002)
    We identify a new type of instability of the accrelation flow which is formed due to interaction of the outgoing winds with the incoming flow. Mainly due to shear instability, the flow oscillates around the equatorial ...

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