xCOLD GASS: The Complete IRAM 30 m Legacy Survey of Molecular Gas for Galaxy Evolution Studies

By A. Saintonge, B. Catinella, L. Tacconi, G. Kauffmann, R. Genzel, L. Cortese, R. Dav'e, T. Fletcher, J. Graciá-Carpio, C. Kramer and 11 more. 2017

332 citations recorded by the source corpus.

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 from the Sloan Digital Sky Survey (SDSS) and therefore representative of the local galaxy population with . 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 , with no systematic variations across the sample. The CO (1–0) luminosity function is constructed and best fit with a Schechter function with parameters , , and . With the sample now complete down to stellar masses of 109 , we are able to extend our study of gas scaling relations and confirm that both molecular gas fractions ( ) and depletion timescale ( ) 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.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/f915b4f88781145ff1ec5f7615920e1f3c3f51f4

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In Astronomy and Astrophysics

1. P. Hopkins
2. L. Hernquist
3. D. Narayanan
4. R. Somerville
5. A. Dekel
6. F. Walter
7. Mark R. Krumholz
8. R. Dav'e

In Instrumentation

1. P. Hopkins
2. A. Dekel
3. T. Naab
4. R. Dav'e
5. R. Genzel
6. L. Hernquist
7. Frédéric Bournaud
8. F. Walter

Citations in the corpus

• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions (2017, methodology): “We also include 89 detections of the low mass extension of XCOLD GASS (log(M*/M)=9.0-10.0, Saintonge et al. 2017).”
• A z = 0 Multiwavelength Galaxy Synthesis. I. A WISE and GALEX Atlas of Local Galaxies (2019, neutral): “We highlight the Salim et al. (2007) values because the xGASS and xCOLDGASS surveys adopt this system (Janowiecki et al. 2017; Saintonge et al. 2017) and these surveys represent important points of comparison for our sample.”
• Cloud-scale Molecular Gas Properties in 15 Nearby Galaxies (2018, methodology): “3CO 3 2 2 1 1 These correspond to the Galactic value for CO(1–0) recommended by Bolatto et al. (2013) along with transition-line ratios of CO(2–1)/CO(1–0)=0.7 (Leroy et al. 2013; Saintonge et al. 2017) and CO(3–2)/CO(1–0)=0.25 for the Antennae (Ueda et al. 2012; Bigiel et al. 2015).”
• simba: Cosmological simulations with black hole growth and feedback (2019, methodology): “Observations are shown from the mass-selected GASS H i survey (Catinella et al. 2012) and its follow-up COLDGASS survey (Saintonge et al. 2017) that obtained H2 masses from CO emission measurements.”
• xGASS: total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe (2018, methodology): “H2 masses were obtained as part of the XCOLD GASS follow-up survey, which measured the CO(1–0) line emission of XGASS galaxies using the IRAM 30 m radio telescope (Saintonge et al. 2017).”