2017ApJ...843...50C -
Astrophys. J., 843, 50-50 (2017/July-1)
12CO(J = 1 $→$ 0) on-the-fly mapping survey of the Virgo cluster spirals. II. Molecular gas properties in different density environments.
CHUNG E.J., YUN M.S., VERHEIJEN M.A.W. and CHUNG A.
Abstract (from CDS):
This study investigated the properties of the molecular gas content and star formation activity of 17 Virgo spirals, 21 Ursa Major (UMa) spirals, 13 Pisces spiral galaxies, and a comparison sample of 11 field spiral galaxies with a spatially resolved gas and stellar distribution. The H i-deficient galaxies with a def_H i_ > 0.4 have a similar range of CO luminosity normalized by the K-band luminosity (LCO/LK) like the field spirals, although their CO content can be smaller by up to a factor of 2. The CO, H i, and stellar disk diameters are closely related to each other for both cluster and field galaxies, and the relative diameters of the CO and H i disks grow monotonically and smoothly as the H i-to-stellar disk diameter ratio decreases. Cluster galaxies have a molecular gas consumption time up to 10 times shorter than that of the field comparison sample, suggesting a significant change in the molecular gas content and star formation activity among all the cluster galaxies, even when they do not show any sign of H i stripping. The strongly H i-stripped Virgo cluster galaxies show only a modestly reduced total gas consumption time, indicating that the star formation activity and gas consumption are a highly local (rather than global) phenomenon. Our finding is that the depletion of cold gas by ram-pressure stripping and/or starvation caused by preprocessing in each cluster environment makes galaxies evolve passively.
Abstract Copyright:
© 2017. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: clusters: individual: (Virgo, Ursa Major, Pisces) - galaxies: evolution - galaxies: star formation - ISM: molecules - ISM: molecules
Simbad objects:
52
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