Are H I-deficient galaxies of the Coma supercluster deficient in molecular gas?

Details Are H I-deficient galaxies of the Coma supercluster deficient in molecular gas? Are H I-deficient galaxies of the Coma supercluster deficient in molecular gas?

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..359c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 359-373.

Astronomy and Astrophysics

Astrophysics

46

Galactic Clusters, Galactic Evolution, Hydrogen Atoms, Molecular Gases, Spiral Galaxies, Carbon Monoxide, Monatomic Gases, X Ray Sources

Scientific paper

The first (C-12)O(1-0) and (C-12)O(2-1) observations of spiral galaxies located in the clusters Abell 1367 and Abell 1656 performed with the 30m IRAM telescope are presented. The molecular mass inside the central 10 kpc of the detected galaxies is found to range from 0.75 to 6.8 x 10 exp 9 solar masses. In H I-deficient galaxies, most of the gas is in molecular form, with H2/H I mass ratios around 2. The star-formation activity of the Coma galaxies,as measured by the LFIR/M(H2) and LFIR/LB ratios or H-alpha emission, is normal and independent of the H I deficiency. The inferred star-formation rates are in the range of 0.1-2 solar mass/yr, which leads to exhaustion time scales of about 4 x 10 exp 9 yr for the total gas content. Consideration is also given to the existence of H2-normal spiral galaxies in the Coma supercluster and the influence of the environmental parameters on the molecular component of cluster galaxies.

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