COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies - II. The non-universality of the molecular gas depletion time-scale

doi:10.1111/j.1365-2966.2011.18823.x

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	COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies - II. The non-universality of the molecular gas depletion time-scale
	Saintonge, Amelie 1,2; Kauffmann, Guinevere 1; Wang, Jing1,3 ; Kramer, Carsten 4; Tacconi, Linda J.2; Buchbender, Christof 4; Catinella, Barbara 1; Gracia-Carpio, Javier 2; Cortese, Luca 5; Fabello, Silvia 1; Fu, Jian 1,6; Genzel, Reinhard 2; Giovanelli, Riccardo 7; Guo, Qi8,9 ; 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 4
	2011-07-01
Source Publication	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume	415 Issue:1 Pages:61-76
Abstract	We study the relation between molecular gas and star formation in a volume-limited sample of 222 galaxies from the COLD GASS survey, with measurements of the CO(1-0) line from the IRAM 30-m telescope. The galaxies are at redshifts 0.025 < z < 0.05 and have stellar masses in the range 10.0 < logM/M-circle dot < 11.5. The IRAM measurements are complemented by deep Arecibo HI observations and homogeneous Sloan Digital Sky Survey and GALEX photometry. A reference sample that includes both ultraviolet (UV) and far-infrared data is used to calibrate our estimates of star formation rates from the seven optical/UV bands. The mean molecular gas depletion time-scale [tdep(H-2)] for all the galaxies in our sample is 1 Gyr; however, t(dep)(H-2) increases by a factor of 6 from a value of similar to 0.5 Gyr for galaxies with stellar masses of similar to 10(10)M(circle dot) to similar to 3 Gyr for galaxies with masses of a few x 10(11)M(circle dot). In contrast, the atomic gas depletion time-scale remains constant at a value of around 3 Gyr. This implies that in high-mass galaxies, molecular and atomic gas depletion time-scales are comparable, but in low-mass galaxies, the molecular gas is being consumed much more quickly than the atomic gas. The strongest dependences of tdep(H-2) are on the stellar mass of the galaxy [parametrized as log tdep(H-2) = (0.36 +/- 0.07)(logM()-10.70) + (9.03 +/- 0.99)], and on the specific star formation rate (sSFR). A single t(dep)(H-2) versus sSFR relation is able to fit both 'normal' star-forming galaxies in our COLD GASS sample and more extreme starburst galaxies (luminous infrared galaxies and ultraluminous infrared galaxies), which have t(dep)(H-2) < 10(8) yr. Normal galaxies at z = 1-2 are displaced with respect to the local galaxy population in the t(dep)(H-2) versus sSFR plane and have molecular gas depletion times that are a factor of 3-5 times longer at a given value of sSFR due to their significantly larger gas fractions.
Keyword	Surveys Galaxies: Evolution Galaxies: Fundamental Parameters Galaxies: Ism Radio Lines: Galaxies
DOI	10.1111/j.1365-2966.2011.18823.x
Indexed By	SCI
Language	英语
WOS ID	WOS:000293755000023
Citation statistics
Document Type	期刊论文
Identifier	http://ir.bao.ac.cn/handle/114a11/8009
Collection	星系部
Affiliation	1.Max Planck Inst Astrophys, D-85741 Garching, Germany 2.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany 3.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China 4.Inst Radioastron Millimetr, Granada 18012, Spain 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 200030, Peoples R China 14.Inst Radioastron Millimetr, F-38406 St Martin Dheres, France
Recommended Citation GB/T 7714	Saintonge, Amelie,Kauffmann, Guinevere,Wang, Jing,et al. COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies - II. The non-universality of the molecular gas depletion time-scale[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,415(1):61-76.
APA	Saintonge, Amelie.,Kauffmann, Guinevere.,Wang, Jing.,Kramer, Carsten.,Tacconi, Linda J..,...&Sievers, Albrecht.(2011).COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies - II. The non-universality of the molecular gas depletion time-scale.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,415(1),61-76.
MLA	Saintonge, Amelie,et al."COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies - II. The non-universality of the molecular gas depletion time-scale".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 415.1(2011):61-76.

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