Galaxy Evolution and Star Formation Efficiency in the Last Half of the Universe

Details Galaxy Evolution and Star Formation Efficiency in the Last Half of the Universe Galaxy Evolution and Star Formation Efficiency in the Last Half of the Universe

2007-09-07

arxiv.org/abs/0709.1172v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, To appear in the proceedings of "SF2A-2007: Semaine de l'Astrophysique Francaise", (J. Bouvier, A. Chalaba

Scientific paper

We present the results of a CO(1-0) emission survey with the IRAM 30m of 30 galaxies at moderate redshift (z ~ 0.2-0.6) to explore galaxy evolution and in particular the star formation efficiency, in the redshift range filling the gap between local and very high-z objects. Our detection rate is about 50%. One of the bright objects was mapped at high resolution with the IRAM interferometer, and about 50% of the total emission found in the 27 arcsec (97 kpc) single dish beam is recovered by the interferometer, suggesting the presence of extended emission. The FIR-to-CO luminosity ratio is enhanced, following the increasing trend observed between local and high-z ultra-luminous starbursts.

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