Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301l..13k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. L13-L17.
Astronomy and Astrophysics
Astrophysics
65
Carbon Monoxide, Hydrogen, Interstellar Gas, Spiral Galaxies, Virgo Galactic Cluster, Mass Ratios, Mass To Light Ratios, Molecular Gases, Monatomic Gases
Scientific paper
CO emission was mapped along the major axis of 23 Virgo cluster spiral galaxies, including many of the H I-deficient spirals. These galaxies appear to have roughly normal CO luminosities and extents, relative to optical properties. The existence of galaxies with unusually large ratios of molecular gas to atomic gas indicate that some process has removed the low-density atomic gas and left the denser molecular gas relatively unscathed. This conclusion is supported by the observation that the ratio of CO to H I diameters decreases away from M87. These results are consistent with a process which selectively strips low-density material, such as ram pressure stripping, thermal evaporation, or turbulent viscous stripping. The relatively large fraction of H I-deficient spirals in Virgo suggests that gas removal events have taken place over at least a cluster crossing time, or about one-billion yr. If atomic gas is removed from the inner disk, the fact that the molecular gas has not yet responded to the atomic gas removal indicates that the molecular phase in galaxies is long-lived.
Kenney Jeffrey D.
Young John S.
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