Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265...19s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 19-31.
Astronomy and Astrophysics
Astrophysics
94
Compact Galaxies, Interstellar Gas, Molecular Clouds, Star Formation, Carbon Dioxide, Dwarf Galaxies, Elliptical Galaxies, Radiative Transfer
Scientific paper
Findings of an investigation of molecular gas in 13 blue compact galaxies and two dwarf irregulars, based upon observations of CO J = 1 yields 0 and J = 2 yields 1 emission, are reported and compared to several previous studies of CO in dwarf galaxies. CO emission is found to be correlated with morphology, with dwarf ellipticals being easier to detect than dwarf irregulars. The ratios of 2 yields 1 to 1 yields 0 emission are used, in conjunction with model radiative transfer calculations, to estimate CO to H2 conversion factors. The results indicate conversion factors of less than three times the standard Milky Way value. Atomic hydrogen dominates the total gas mass of every galaxy in the present sample, but, contrary to a previous study, no correlation is found between LCO/M(HI) and metallicity. The current massive star formation efficiencies and gas depletion times are comparable to those calculated for normal spiral galaxies.
Henkel Carsten
Loose Hans-Hermann
Sage Leslie J.
Salzer John Joseph
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