COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies - I. Relations between H2, HI, stellar content and structural properties

被引：421

作者：

Saintonge, Amelie ^{[1
,2
]}

Kauffmann, Guinevere ^{[1
]}

Kramer, Carsten ^{[3
]}

Tacconi, Linda J. ^{[2
]}

Buchbender, Christof ^{[3
]}

Catinella, Barbara ^{[1
]}

Fabello, Silvia ^{[1
]}

Gracia-Carpio, Javier ^{[2
]}

Wang, Jing ^{[1
,4
]}

Cortese, Luca ^{[5
]}

Fu, Jian ^{[1
,6
]}

Genzel, Reinhard ^{[2
]}

Giovanelli, Riccardo ^{[7
]}

Guo, Qi ^{[8
,9
]}

Haynes, Martha P. ^{[7
]}

Heckman, Timothy M. ^{[10
]}

Krumholz, Mark R. ^{[11
]}

Lemonias, Jenna ^{[12
]}

Li, Cheng ^{[6
,13
]}

Moran, Sean ^{[10
]}

Rodriguez-Fernandez, Nemesio ^{[14
]}

Schiminovich, David ^{[12
]}

Schuster, Karl ^{[14
]}

Sievers, Albrecht ^{[3
]}

机构：

[1] Max Planck Inst Astrophys, D-85741 Garching, Germany

[2] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[3] Inst Radioastron Millimetr, Granada 18012, Spain

[4] Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China

[5] European So Observ, D-85748 Garching, Germany

[6] Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[7] Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY 14853 USA

[8] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[9] Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England

[10] Johns Hopkins Univ, Baltimore, MD 21218 USA

[11] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[12] Columbia Univ, Dept Astron, New York, NY 10027 USA

[13] Shanghai Astron Observ, Max Planck Inst Partner Grp, Shanghai, Peoples R China

[14] Inst Radioastron Millimetr, F-38406 St Martin Dheres, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2011年 / 415卷 / 01期

关键词：

surveys; galaxies: evolution; galaxies: fundamental parameters; galaxies: ISM; radio lines: galaxies; NEARBY SPIRAL GALAXIES; STAR-FORMATION EFFICIENCY; ARECIBO SDSS SURVEY; DIGITAL SKY SURVEY; INTERSTELLAR-MEDIUM; CARBON-MONOXIDE; FORMING GALAXIES; CO(2-1) SURVEY; ATOMIC GAS; EMISSION;

D O I：

10.1111/j.1365-2966.2011.18677.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We are conducting COLD GASS, a legacy survey for molecular gas in nearby galaxies. Using the IRAM 30-m telescope, we measure the CO(1-0) line in a sample of similar to 350 nearby (D-L similar or equal to 100-200 Mpc), massive galaxies (log(M-*/M-circle dot) > 10.0). The sample is selected purely according to stellar mass, and therefore provides an unbiased view of molecular gas in these systems. By combining the IRAM data with Sloan Digital Sky Survey (SDSS) photometry and spectroscopy, GALEX imaging and high-quality Arecibo HI data, we investigate the partition of condensed baryons between stars, atomic gas and molecular gas in 0.1-10L* galaxies. In this paper, we present CO luminosities and molecular hydrogen masses for the first 222 galaxies. The overall CO detection rate is 54 per cent, but our survey also uncovers the existence of sharp thresholds in galaxy structural parameters such as stellar mass surface density and concentration index, below which all galaxies have a measurable cold gas component but above which the detection rate of the CO line drops suddenly. The mean molecular gas fraction MH2/M* of the CO detections is 0.066 +/- 0.039, and this fraction does not depend on stellar mass, but is a strong function of (NUV - r) colour. Through stacking, we set a firm upper limit of MH2/M-* = 0.0016 +/- 0.0005 for red galaxies with NUV - r > 5.0. The average molecular-to-atomic hydrogen ratio in present-day galaxies is 0.3, with significant scatter from one galaxy to the next. The existence of strong detection thresholds in both the HI and CO lines suggests that 'quenching' processes have occurred in these systems. Intriguingly, atomic gas strongly dominates in the minority of galaxies with significant cold gas that lie above these thresholds. This suggests that some re-accretion of gas may still be possible following the quenching event.

引用

页码：32 / 60

页数：29

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