Berkeley Prize: Mapping the Fuel for Star Formation in Early Universe Galaxies

Details Berkeley Prize: Mapping the Fuel for Star Formation in Early Universe Galaxies Berkeley Prize: Mapping the Fuel for Star Formation in Early Universe Galaxies

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942101t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #421.01

Astronomy and Astrophysics

Astronomy

Scientific paper

Stars form from cold molecular interstellar gas, which is relatively rare in galaxies like the Milky Way, which form only a few new stars per year. Massive galaxies in the distant universe formed stars much more rapidly. Was star formation more efficient in the past, and/or were early galaxies richer in molecular gas? The answer was elusive when our instruments could probe molecules only in the most luminous and rare objects such as mergers and quasars. But a new survey of molecular gas in typical massive star-forming galaxies at redshifts from about 1.2 to 2.3 (corresponding to when the universe was 24% to 40% of its current age) reveals that distant star-forming galaxies were indeed molecular-gas rich and that the star-formation efficiency is not strongly dependent on cosmic epoch.

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