The Evolution of Molecular Gas in Normal Galaxies (EGNoG) Survey is poised to reveal how star-forming galaxies have evolved over the past 8 billion years, from redshift 1 to today. Observations are underway now at the Combined Array for Research in Millimeter-wave Astronomy (CARMA), tracing the molecular gas in intermediate redshift galaxies using the 12CO(1-0) and 12CO(3-2) transitions, observed at 3 mm and 1 mm respectively. By investigating how the molecular gas content of star-forming galaxies has been changing from z=1 to today, this survey will connect our understanding of galaxies in the local universe to the relatively new field of high-redshift galaxies, which observations suggest have ten times more molecular gas than local galaxies! Understanding this dramatic evolution from high-redshift, gas-rich galaxies to local, gas-poor galaxies is a key component of understanding the evolution of galaxies in our universe.
The galaxies observed as part of the EGNoG survey have been selected from the Sloan Digital Sky Survey (SDSS) and the Cosmological Evolution Survey (COSMOS). Galaxies are selected in four redshift bins, extending from z=0.05 to z=0.53. The optical images from SDSS and COSMOS are shown below for the 31 sample galaxies. SDSS images (black background) are 20 arcminutes on a side and the COSMOS images (gray background) are 5 arcminutes on a side.
- The EGNoG Survey: Gas Excitation in Normal Galaxies at
Bauermeister, Blitz, Bolatto, Bureau, Teuben, Wong and
submitted to ApJ July 2012
For team members, also consult the