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Browsing by Subject "Galactic Evolution"

Browsing by Subject "Galactic Evolution"

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  • Chemical evolution coefficients for the study of galactic evolution 
    Mallik, D. C. V (D.Reidel Publishing Co.,, 1981-05)
    A new evaluation of chemical evolution coefficients has been made using recent stellar evolution and nucleosynthesis data. The role of the low and intermediate mass stars in galactic nucleosynthesis has been emphasized. A ...
  • A correlation between ellipticity and core-strength in extended radio galaxies 
    Prabhu, T. P; Kochhar, R. K (D. Reidel Publishing Co., 1984-07)
    The authors show that in the case of extended radio sources a correlation exists between the fraction of the radio flux retained in the core component and the ellipticity of the underlying galaxy. The correlation is in the ...
  • Ejection of massive black holes from galaxies 
    Kapoor, R. C (Indian Academy of Sciences, 1976-11)
    Gravitational recoil of a gigantic black hole of about 10 to the 8th to 10 to the 9th solar masses formed in the nonspherical collapse of the nuclear part of a typical galaxy can take place with an appreciable speed as a ...
  • Neutral fermions as the missing mass matter in galactic halos 
    Datta, B; Sivaram, C; Ghosh, S. K (Springer, 1985-04)
    Several independent considerations which rule out the hypothesis that the missing mass in galactic halos is composed of massive neutral fermions such as neutrinos, gravitinos, or photinos are discussed. It is found that ...
  • On structure formation in the universe 
    Satya Narayanan, A (Springer, 1994-12)
    The formation of structures in the universe is one of the most challenging problems of cosmology. In this paper, an attempt to explain the formation of galaxies through the generation of vortices (with dissipation) in an ...
  • On the dynamical evolution of a spheroidal cluster 
    Sunder, G. S; Kochhar, R. K (The Royal Astronomical Society, 1985-03)
    Tensor virial equations are used to investigate the dynamical evolution of a cluster of mass points characterized by a spheroidal (homogeneous or heterogeneous) distribution of matter and an isotropic distribution of ...
  • Planetary nebulae and nitrogen enrichment in the galaxy 
    Mallik, D. C. V (Geneva Observatory, 1978)
    The extent of nitrogen enrichment of the interstellar gas by planetary-nebula formation is evaluated, and the nitrogen and oxygen abundance gradients in the disk of the Galaxy are derived on the basis of a simple model for ...
  • Some aspects of MOND and its consequences for cosmology 
    Sivaram, C (Springer, 1994-05)
    Some consequences of MOND (Modification of Newtonian dynamics) proposed as an alternative hypothesis to dark matter for various astrophysical situations is discussed. The ubiquitous occurrence of the fundamental acceleration ...
  • Supernovae in early-type galaxies 
    Kochhar, R. K (Kluwer Academic Publishers, 1989-07)
    It is argued that all SNI come from short-lived stars and do not occur in a typical, isolationist, gas-free early-type galaxy. SNI occur only in those galaxies which accrete gas and form stars. SN properties of E/SOs are, ...

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