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Browsing by Author "Chakrabarti, S. K"

Browsing by Author "Chakrabarti, S. K"

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  • Accretion flow properties of GRS 1716-249 during its 2016–17 failed outburst 
    Chatterjee, Kaushik; Debnath, Dipak; Chatterjee, Debjit; Jana, Arghajit; Sujoy Kumar Nath; Bhowmick, Riya; Chakrabarti, S. K (Springer Nature, 2021-07)
    In 2016–17, the Galactic transient black hole candidate GRS 1716-249 exhibited an outburst event after a long quiescence period of almost 23 years. The source remained in the outbursting phase for almost 9 months. We study ...
  • Accretion flow properties of GRS 1915+105 during Its θ class using AstroSat data 
    Banerjee, Anuvab; Bhattacharjee, Ayan; Chatterjee, Debjit; Debnath, Dipak; Chakrabarti, S. K; Katoch, Tilak; Antia, H. M (IOP Publishing, 2021-08-01)
    The Galactic microquasar GRS 1915+105 shows rich variability that is categorized into different classes. In this paper, we report the temporal and spectral analysis of GRS 1915+105 to study the properties of the accretion ...
  • Accretion properties of MAXI J1813-095 during its failed outburst in 2018 
    Jana, Arghajit; Jaisawal, G. K; Naik, Sachindra; Neeraj Kumari; Chatterjee, Debjit; Chatterje, Kaushik; Bhowmick, Riya; Chakrabarti, S. K; Chang, H.-K; Debnath, Dipak (IOP Publishing, 2021-05)
    We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI J1813–095 using Swift, NICER, and NuSTAR observations during its 2018 outburst. The timing behavior of the source is ...
  • 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 ...
  • Flux and spectral variability of Mrk 421 during its moderate activity state using NuSTAR: Possible accretion disc contribution? 
    Mondal, S; Priyanka Rani; Stalin, C. S; Chakrabarti, S. K; Rakshit, S (EDP Sciences, 2022-07)
    Context. The X-ray emission in BL Lac objects is believed to be dominated by synchrotron emission from their relativistic jets. However, when the jet emission is not strong, one could expect signatures of X-ray emission ...
  • 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 ...
  • Jet properties of XTE J1752−223 during its 2009–2010 outburst 
    Debnath, Dipak; Chatterjee, Kaushik; Chatterjee, Debjit; Jana, Arghajit; Chakrabarti, S. K (Oxford University Press on behalf of the Royal Astronomical Society, 2021-07)
    Galactic short orbital period black hole candidate (BHC) XTE J1752−223 was discovered on 2009 October 21 by the Rossi X-ray Timing Explorer (RXTE). We study the spectral properties of this outburst using transonic flow ...
  • 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 ...
  • Relation between Quiescence and Outbursting Properties of GX 339-4 
    Bhowmic, Riya; Debnath, Dipak; Chatterjee, Kaushik; Nagarkoti, Shreeram; Chakrabarti, S. K; Sarkar, Ritabrata; Chatterjee, Debjit; Jana, Arghajit (IOP Publishing, 2021-04-01)
    Galactic black hole candidate GX 339-4 underwent several outbursting phases in the past two and a half decades at irregular intervals of 2–3 years. The nature of these outbursts in terms of the duration, number of peaks, ...
  • 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.
  • Spectral signature of mass outflow in the two component advective flow paradigm 
    Mondal, Santanu; Chakrabarti, S. K (IOP Publishing, 2021-10-10)
    Outflows are common in many astrophysical systems. In the Two Component Advective Flow (TCAF) paradigm, which is essentially a generalized Bondi flow including rotation, viscosity, and cooling effects, the outflow originates ...
  • SS 433: results of a recent multiwavelength campaign 
    Chakrabarti, S. K; Anandarao, B. G; Pal, S; Mondal, S; Nandi, A; Bhattacharyya, A; Mandal, S; Sagar, R; Pandey, J. C; Pati, A. K; Saha, S. K (Royal Astronomical Society, 2005-09)
    We conducted a multiwavelength campaign in 2002 September-October, to observe SS 433. We used the Giant Meter Radio Telescope for radio observations, the Physical Research Laboratory Infrared Telescope at Mt Abu for infrared ...
  • 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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