TY - JOUR
T1 - XCOLD GASS
T2 - The Complete IRAM 30 m Legacy Survey of Molecular Gas for Galaxy Evolution Studies
AU - Saintonge, Amélie
AU - Catinella, Barbara
AU - Tacconi, Linda J.
AU - Kauffmann, Guinevere
AU - Genzel, Reinhard
AU - Cortese, Luca
AU - Davé, Romeel
AU - Fletcher, Thomas J.
AU - Graciá-Carpio, Javier
AU - Kramer, Carsten
AU - Heckman, Timothy M.
AU - Janowiecki, Steven
AU - Lutz, Katharina A.
AU - Rosario, David J.
AU - Schiminovich, David
AU - Schuster, Karl
AU - Wang, Jing
AU - Wuyts, Stijn
AU - Borthakur, Sanchayeeta
AU - Lamperti, Isabella
AU - Roberts-Borsani, Guido W.
PY - 2017/12/8
Y1 - 2017/12/8
N2 - We introduce xCOLD GASS, a legacy survey providing a census of molecular gas in the local universe. Building on the original COLD GASS survey, we present here the full sample of 532 galaxies with CO (1-0) measurements from the IRAM 30 m telescope. The sample is mass-selected in the redshift interval 0.01 < z < 0.05 from the Sloan Digital Sky Survey (SDSS) and therefore representative of the local galaxy population with M∗ > 109 M⊙. The CO (1-0) flux measurements are complemented by observations of the CO (2-1) line with both the IRAM 30 m and APEX telescopes, H I observations from Arecibo, and photometry from SDSS, WISE, and GALEX. Combining the IRAM and APEX data, we find that the ratio of CO (2-1) to CO (1-0) luminosity for integrated measurements is r21 = 0.79 ± 0.03, with no systematic variations across the sample. The CO (1-0) luminosity function is constructed and best fit with a Schechter function with parameters LCO ∗ = (7.77 ± 2.11) × 109 K km s-1 pc2, φ∗ = (9.84 ± 5.41) × 10-4 Mpc-3, and α = -1.19 ± 0.05.With the sample now complete down to stellar masses of 109M⊙, we are able to extend our study of gas scaling relations and confirm that both molecular gas fractions ( fH2) and depletion timescale (tdep (H2)) vary with specific star formation rate (or offset from the star formation main sequence) much more strongly than they depend on stellar mass. Comparing the xCOLD GASS results with outputs from hydrodynamic and semianalytic models, we highlight the constraining power of cold gas scaling relations on models of galaxy formation.
AB - We introduce xCOLD GASS, a legacy survey providing a census of molecular gas in the local universe. Building on the original COLD GASS survey, we present here the full sample of 532 galaxies with CO (1-0) measurements from the IRAM 30 m telescope. The sample is mass-selected in the redshift interval 0.01 < z < 0.05 from the Sloan Digital Sky Survey (SDSS) and therefore representative of the local galaxy population with M∗ > 109 M⊙. The CO (1-0) flux measurements are complemented by observations of the CO (2-1) line with both the IRAM 30 m and APEX telescopes, H I observations from Arecibo, and photometry from SDSS, WISE, and GALEX. Combining the IRAM and APEX data, we find that the ratio of CO (2-1) to CO (1-0) luminosity for integrated measurements is r21 = 0.79 ± 0.03, with no systematic variations across the sample. The CO (1-0) luminosity function is constructed and best fit with a Schechter function with parameters LCO ∗ = (7.77 ± 2.11) × 109 K km s-1 pc2, φ∗ = (9.84 ± 5.41) × 10-4 Mpc-3, and α = -1.19 ± 0.05.With the sample now complete down to stellar masses of 109M⊙, we are able to extend our study of gas scaling relations and confirm that both molecular gas fractions ( fH2) and depletion timescale (tdep (H2)) vary with specific star formation rate (or offset from the star formation main sequence) much more strongly than they depend on stellar mass. Comparing the xCOLD GASS results with outputs from hydrodynamic and semianalytic models, we highlight the constraining power of cold gas scaling relations on models of galaxy formation.
KW - galaxies: evolution
KW - galaxies: ISM
KW - galaxies: star formation
KW - ISM: general
UR - http://www.scopus.com/inward/record.url?scp=85039860877&partnerID=8YFLogxK
U2 - 10.3847/1538-4365/aa97e0
DO - 10.3847/1538-4365/aa97e0
M3 - Article
AN - SCOPUS:85039860877
SN - 0067-0049
VL - 233
JO - Astrophysical Journal Supplement
JF - Astrophysical Journal Supplement
IS - 22
M1 - 22
ER -