Observational constraints on galaxy-IGM interactions in the virgo cluster
Previously published 21 cm data and optical emission line fluxes from a new nuclear spectroscopic survey for disk galaxies in Virgo are examined for possible evidence of galaxy-intergalactic medium (IGM) interaction. The H i-color correlation diagram for Virgo spirals using data from the Chamaraux et al. H i survey shows that most of the H i deficient Virgo spirals have integral colors appropriate for their H i content; that is, they are quite red. However, a few of those spirals are relatively blue, and they may be good candidates for recently ''stripped'' spirals. By contrast, the data from the nuclear spectroscopic survey of Virgo appear to show no difference between the emission line strenghts for the Virgo galaxies and the field sample. Therefore, the mechanism that is responsible for producing disk H i deficiency is more efficient at removing neutral gas from the disks of galaxies than ionized gas from galaxy nuclei. A number of disk galaxies near the cluster center do have moderately strong nonthermal excitation nuclear emission line spectra, but the cause for that activity can be adequately explained via internal properties of those galaxies without reference to their external environment.
- Research Organization:
- University of California at Berkeley
- OSTI ID:
- 6268518
- Journal Information:
- Astrophys. J.; (United States), Vol. 264:1
- Country of Publication:
- United States
- Language:
- English
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