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Date and Time of the Query: 2019-06-25 T23:53:28 PDT
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For refcode 2005ApJ...624..714G:
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Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...624..714G The Nature of Nearby Counterparts to Intermediate-Redshift Luminous Compact Blue Galaxies. II. CO Observations C. A. Garland, J. P. Williams, D. J. Pisano, R. Guzman, F. J. Castander, and J. Brinkmann Abstract. We present the results of a single-dish beam-matched survey of the three lowest rotational transitions of CO in a sample of 20 local (D<~70 Mpc) luminous compact blue galaxies (LCBGs). These ~L*, blue, high surface brightness, starbursting galaxies were selected on the same criteria used to define LCBGs at higher redshifts. Our detection rate was 70%, with those galaxies having L_B_<7x10^9^ L_sun_ not detected. We find that the H_2_ masses of local LCBGs range from 6.6x10^6^ to 2.7x10^9^ M_sun_, assuming a Galactic CO-to-H_2_ conversion factor. Combining these results with our earlier H i survey of the same sample, we find that the ratio of molecular to atomic gas mass is low, typically 5% - 10%. Using a large velocity gradient model, we find that the average gas conditions of the entire interstellar medium in local LCBGs are similar to those found in the centers of star-forming regions in our Galaxy and in the nuclear regions of other galaxies. Star formation rates, determined from IRAS fluxes, are a few M_sun_ yr^-1^, much higher per unit dynamical mass than normal spiral galaxies. If this rate remains constant, the molecular hydrogen depletion timescales are short, ~10 - 200 Myr. Keywords: Galaxies: ISM, Galaxies: Starburst, Radio Lines: Galaxies
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