Large molecular gas reservoirs in ancestors of Milky Way-mass galaxies nine billion years ago

被引：28

作者：

Papovich, C. ^{[1
,2
]}

Labbe, I. ^{[3
]}

Glazebrook, K. ^{[4
]}

Quadri, R. ^{[1
,2
]}

Bekiaris, G. ^{[4
]}

Dickinson, M. ^{[5
]}

Finkelstein, S. L. ^{[6
]}

Fisher, D. ^{[4
]}

Inami, H. ^{[5
,7
]}

Livermore, R. C. ^{[6
]}

Spitler, L. ^{[8
,9
]}

Straatman, C.

Tran, K. -V. ^{[1
,2
]}

机构：

[1] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundament, College Stn, TX 78743 USA

[2] Texas A&M Univ, Dept Phys & Astron, 4242 TAMU, College Stn, TX 78743 USA

[3] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[4] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[5] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[6] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

[7] Univ Lyon 1, CNRS, Ctr Rech Astrophys Lyon, Observ Lyon, 9 Ave Charles Andre, F-69561 St Genis Laval, France

[8] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia

[9] Australian Astron Observ, POB 915, N Ryde, NSW 1670, Australia

来源：

NATURE ASTRONOMY | 2017年 / 1卷 / 01期

关键词：

STAR-FORMATION RATE; MAIN-SEQUENCE GALAXIES; H-2 CONVERSION FACTOR; METALLICITY RELATION; SCALING RELATIONS; FORMING GALAXIES; LEGACY SURVEY; STELLAR MASS; DEEP SURVEY; CO;

D O I：

10.1038/s41550-016-0003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The gas accretion and star formation histories of galaxies like the Milky Way remain an outstanding problem in astrophysics(1,2). Observations show that 8 billion years ago, the progenitors to Milky Way-mass galaxies were forming stars 30 times faster than today and were predicted to be rich in molecular gas(3), in contrast to the low present-day gas fractions (<10%)(4-6). Here we show the detection of molecular gas from the CO (J = 3-2) emission (rest-frame 345.8 GHz) in galaxies at redshifts z = 1.2-1.3, selected to have the stellar mass and star formation rate of the progenitors of today's Milky Way-mass galaxies. The CO emission reveals large molecular gas masses, comparable to or exceeding the galaxy stellar masses, and implying that most of the baryons are in cold gas, not stars. The total luminosities of the galaxies from star formation and CO luminosities yield long gas consumption timescales. Compared to local spiral galaxies, the star formation efficiency, estimated from the ratio of total infrared luminosity (L-IR) to CO emission, has remained nearly constant since redshift z = 1.2, despite the order of magnitude decrease in gas fraction, consistent with the results for other galaxies at this epoch(7-10). Therefore, the physical processes that determine the rate at which gas cools to form stars in distant galaxies appear to be similar to that in local galaxies.

引用

页数：6

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