Abstract
view Abstract Citations (75) References (54) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Virial properties of groups of galaxies. Rood, H. J. ; Dickel, J. R. Abstract Modern techniques and data are used to derive virial parameters for numerous well-known groups of galaxies. Virial mass-to-light ratios are typically 40-120 solar units. The groups are gravitationally bound because (a) their crossing times are smaller than a Hubble time, and (b) the composite frequency distribution of their radial velocities is 'approximately' Gaussian. A correlation is observed between the virial mass-to-light ratio and the virial velocity dispersion. Contributions to this correlation by projection and quasi-equilibrium effects, radial velocity uncertainties, and uncertainties in galactic mass are evaluated and found to be too small to explain the correlation. The average surface density of galaxies in groups appears to be independent of distance from the center out to a mean limiting radius. Publication: The Astrophysical Journal Pub Date: September 1978 DOI: 10.1086/156422 Bibcode: 1978ApJ...224..724R Keywords: Galactic Clusters; Virial Theorem; Astronomical Catalogs; Galactic Evolution; Galactic Mass; Galactic Structure; Gravitational Effects; Luminosity; Mass Ratios; Radial Velocity; Tables (Data); Astrophysics; Groups of Galaxies:Mass-to-Light Ratios; Groups of Galaxies:Virial Theorem full text sources ADS |
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