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Journal Article
Less greedy galaxies gulp gas
2010
Overview
The cool molecular gas from which stars form has been detected in relatively ordinary faraway galaxies. The results point to a continuous fuelling of gas into the star-forming guts of assembling galaxies.
Gas supply to the stars
Star formation requires the presence of cold molecular gas, which makes up only a small fraction of the total mass of the Milky Way and nearby galaxies where only a few new stars are formed per year. To establish whether the rapid star formation occurring in distant massive galaxies reflects a greater supply of cold gas or a more efficient process of star formation, gas content was surveyed in massive-star-forming galaxies at two cosmic epochs — at redshifts of approximately 1.2 and 2.3, when the Universe was 40% and 24% of its current age. The results reveal that distant star-forming galaxies were indeed gas rich and that the star-formation efficiency is not strongly dependent on cosmic epoch. The average fraction of cold gas relative to total galaxy mass is three to ten times higher in distant galaxies than in today's massive spiral galaxies.
Publisher
Nature Publishing Group UK,Nature Publishing Group
