Gas Accretion and Star Formation in an Ensemble of
Nearby Milky Way-like Galaxies
B. Catinella, A. Saintonge, S. Moran
The GALEX Arecibo SDSS Survey (GASS) is an ongoing large targeted survey at Arecibo, home to the world's largest single-dish radio telescope. GASS is designed to measure the neutral hydrogen content of a representative sample of ~1000 galaxies similar in mass to the Milky Way, uniformly selected from the SDSS spectroscopic and GALEX imaging surveys.
A sister survey COLD GASS is being conducted at the IRAM 30m telescope to better understand the connection between atomic and molecular gas and star formation in the same galaxies. I will discuss recent results from both surveys, highlighting how the outer disks of spiral galaxies like our own Milky Way are still being assembled at the present day.
I will also discuss the fact that molecular gas depletion timescales are found to depend on global galaxy properties.