Evolution of the Abundance of Molecular Gas and Dust in Young Massive Galaxies

Details Evolution of the Abundance of Molecular Gas and Dust in Young Massive Galaxies Evolution of the Abundance of Molecular Gas and Dust in Young Massive Galaxies

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...18910311f&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #103.11; Bulletin of the American Astronomical Society, Vol. 28, p.1413

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We present a set of chemical evolutionary models to estimate the global abundance of molecular gas and dust in galaxies as a function of metallicity and cosmological epoch. This work is motivated by the recent detections of CO and dust at high redshift. Over a wide range of input parameters, we find that (1) the total mass in gaseous metals peaks at early epochs (z ~ 1-3) when approximately half the total baryonic mass is in stars and half is in gas, (2) at its extreme, the mass of gaseous metals ranges from a few to more than ten times larger than the mass of gaseous metals at the current epoch, (3) the O/C ratios are expected to be significantly larger in chemically young systems which could enhance the O_2/CO ratio within dark molecular clouds at early cosmological epochs.

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