Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..461w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 461-470.
Other
6
Astronomical Photography, Galactic Clusters, Optical Properties, Radial Velocity, Radio Spectra, Spiral Galaxies, Virial Theorem
Scientific paper
H I line observations are used to investigate the dynamical stability of a small group of spiral galaxies in the Coma/A1367 Supercluster. Located 12° southwest of A1367, the IC 698 group is one of the smallest systems that have been observed in this supercluster. The group appears well isolated from other galaxies and has a surprisingly small velocity dispersion, only 46 km s-1. It has a negative total energy, satisfying the conditions for gravitational stability. Application of the virial theorem gives a mass of the group which is comparable to the sum of the individual masses within the photometric radii of its galaxies. The virial mass-to-light ratio of the group is in excellent agreement with the M/LB ratio of high-luminosity spiral galaxies (M/LB ≡ 5 solar units). Large-scale photographs are also presented in order to obtain reliable Hubble types for each member of the group.
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