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Browsing by Author "Majumdar, S"

Browsing by Author "Majumdar, S"

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  • Connecting 3D Evolution of Coronal Mass Ejections to Their Source Regions 
    Majumdar, S; Pant, V; Ritesh Patel; Banerjee, D (IOP Publishing, 2020-08-10)
    Since coronal mass ejections (CMEs) are the major drivers of space weather, it is crucial to study their evolution starting from the inner corona. In this work we use graduated cylindrical shell model to study the 3D ...
  • Constraining cosmological parameters through Sunyaev-Zel'dovich surveys 
    Majumdar, S; Subrahmanyan, R (Indian Academy Of Sciences, 1999-12)
    For cold dark matter models, images of temperature fluctuations in the cosmic microwave background (CMB), due to Sunyaev Zel'dovich (SZ) effect have been been simulated taking a cosmological distribution of clusters into ...
  • Constraints on structure formation models from the Sunyaev-Zel'dovich effect 
    Majumdar, S; Subrahmanyan, R (Royal Astronomical Society, 2000-03)
    In the context of cold dark matter (CDM) cosmological models, we have simulated images of the brightness temperature fluctuations in the cosmic microwave background (CMB) sky owing to the Sunyaev–Zel'dovich (S–Z) effect ...
  • Dynamics of dwarf-spheroidals and the dark matter halo of the galaxy 
    Cowsik, R; Ratnam, C; Bhattacharjee, P; Majumdar, S (Elsevier B. V., 2007-08)
    The dynamics of the dwarf-spheroidal (dSph) galaxies in the gravitational field of the Galaxy is investigated with particular reference to their susceptibility to tidal break-up. Based on the observed paucity of the dSphs ...
  • Investigating Width Distribution of Slow and Fast CMEs in Solar Cycles 23 and 24 
    Pant, V; Majumdar, S; Patel, R; Chauhan, A; Banerjee, D; Gopalswamy, N (Frontiers, 2021-05)
    Coronal Mass Ejections (CMEs) are highly dynamic events originating in the solar atmosphere, that show a wide range of kinematic properties and are the major drivers of the space weather. The angular width of the CMEs ...
  • On Cooling Flows and the Sunyaev-Zeldovich Effect 
    Majumdar, S; Nath, B. B (The American Astronomical Society, 2000-10)
    We study the effect of cooling flows in galaxy clusters on the Sunyaev-Zeldovich (SZ) distortion and the possible cosmological implications. The SZ effect, along with X-ray observations of clusters, is used to determine ...
  • Probing the Evolution of the Gas Mass Fraction with the Sunyaev-Zeldovich Effect 
    Majumdar, S (American Astronomical Society, 2001-07)
    Study of the primary anisotropies of the cosmic microwave background (CMB) can be used to determine the cosmological parameters to a very high precision. The power spectrum of the secondary CMB anisotropies due to the ...
  • Relativistic ab initio spectroscopy study of forbidden lines of singly ionized zinc 
    Dixit, G; Sahoo, B. K; Chaudhuri, R. K; Majumdar, S (Institute of Physics, 2009-08-28)
    The ab initio calculation has been carried out to study the astrophysically important forbidden electromagnetic transition rates of singly ionized zinc (Zn II). Electron correlations are considered to all orders using ...
  • Sunyaev-Zel'dovich distortion from early galactic winds 
    Majumdar, S; Nath, B. B; Chiba, M (Royal Astronomical Society, 2001-07)
    We consider the distortion in the cosmic microwave background (CMB) resulting from galactic winds at high redshift. Winds outflowing from galaxies have been hypothesized to be possible sources of metals in the intergalactic ...

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