IIA Institutional Repository

Browsing by Subject "accretion"

Browsing by Subject "accretion"

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  • Analytical studies of standing shocks in accretion flows around compact objects 
    Das, S (Astronomical Society of India, 2005-09)
    Shocks in advective flows around black holes have become es- sential ingredients in explaining wide variety of observed features. We first analytically study the properties of shocks in the special case when viscosity and ...
  • Irregular Singularity of the Magnetorotational Instability in a Keplerian Disk 
    Furukawa, M; Yoshida, Z; Hirota, M; Krishan, V (University of Chicago Press, 2007-04)
    The center of a Keplerian disk is an irregular singularity for the eigenfunctions of magnetorotational instabilities. The system is studied using the small-radius approximation, which by no means implies that the analysis ...
  • The non-linear theory of a warp ed accretion disc with the Beta -viscosity prescription 
    Ghanbari, J; Shadmehri, M; Salehi, F (Astronomical Society of India, 2005-12)
    We study the nonlinear dynamics of a warped or twisted accretion disc, in which the viscosity coefficients are assumed to be locally proportional to the rotational velocity (Beta -prescription). Using asymptotic methods ...
  • NuSTAR and Swift observations of the extragalactic black hole X-ray binaries 
    Jana, Arghajit; Naik, Sachindra; Chatterjee, Debjit; Jaisawal, Gaurava K. (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    We present the results obtained from detailed spectral and timing studies of extragalactic black hole X-ray binaries LMC X–1 and LMC X–3, using simultaneous observations with Nuclear Spectroscopic Telescope Array (NuSTAR) ...
  • Optical and X-ray studies of three polars: RX J0859.1 + 0537, RX J0749.1–0549, and RX J0649.8–0737 
    Joshi, Arti; Pandey, J. C; Singh, K. P; Anupama, G. C; Singh, H. P (Oxford University Press on behalf of the Royal Astronomical Society, 2020-01)
    We present optical photometric and spectroscopic observations, and an analysis of archival X-ray data of three polars: RX J0859.1+0537, RX J0749.1–0549, and RX J0649.8–0737. Optical light curves of these three polars reveal ...
  • Spectral properties of GX 339−4 in the intermediate state using AstroSat observation 
    Jana, Arghajit; Chatterjee, Debjit; Chang, Hsiang-Kuang; Naik, Sachindra; Monda, Santanu (Oxford University Press on behalf of Royal Astronomical Society, 2024-01)
    We present the results obtained from the spectral studies of black hole X-ray binary GX 339−4 using AstroSat observations during its 2021 outburst. AstroSat observed the source in the intermediate state for ∼600 ks. The ...
  • Survival of Population III stars 
    Dutta, Jayanta; Sur, Sharanya; Stacy, Athena; Bagla, Jasjeet Singh (Cambridge University Press, 2018-05)
    In our earlier studyDutta (2016a), it has been shown that a number of primordial protostars (the ‘first stars’ in the Universe, also known as Population III or Pop III stars) are being ejected from the cluster of their ...

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