Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........40m&link_type=abstract
PhD Dissertation, Columbia Univ. New York, NY United States
Physics
17
Neutral Gases, Hydrogen, Galactic Clusters, H I Regions, Velocity Distribution, Very Large Array (Vla), Dwarf Galaxies, Spiral Galaxies, Optical Disks, Kinematics, Luminosity, Elliptical Galaxies
Scientific paper
A volume-limited neutral hydrogen survey of the Hydra I galaxy cluster has been performed using the VLA (Very Large Array). More than 70% of the cluster core volume has been surveyed to a sensitivity of 5 x 107 M(solar) per beam. Forty-nine galaxies are detected and their neutral hydrogen properties presented. While eleven spirals went undetected, ten uncatalogued dwarf galaxies are detected, the majority of which reside in the center of the cluster. HI diameters are derived for the larger systems and are found to extend beyond the optical disks for all but one galaxy. None of the central galaxies displays a stripped gas disk. However, the cluster does display a significant global gas deficiency that is not correlated with signatures of ram pressure stripping. An investigation of the cluster kinematics reveals that the spirals in the central region form a separate kinematical system having a mean velocity more than 500 km s-1 lower than the ellipticals. This velocity discrepancy decreases with radius from the cluster center. The implications of the unusual kinematics are discussed in the context of the HI observations. An HI mass function is constructed and found to be consistent with a Schechter luminosity function with no trend to increase toward lower masses.
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