THE MOLECULAR GAS CONTENT OF z=3 LYMAN BREAK GALAXIES: EVIDENCE OF A NON-EVOLVING GAS FRACTION IN MAIN-SEQUENCE GALAXIES AT z > 2

被引：84

作者：

Magdis, Georgios E. ^{[1
]}

Daddi, E. ^{[2
]}

Sargent, M. ^{[2
]}

Elbaz, D. ^{[2
]}

Gobat, R. ^{[2
]}

Dannerbauer, H. ^{[3
]}

Feruglio, C. ^{[4
]}

Tan, Q. ^{[2
]}

Rigopoulou, D. ^{[1
,5
]}

Charmandaris, V. ^{[6
,7
,8
,9
]}

Dickinson, M. ^{[10
]}

Reddy, N. ^{[11
]}

Aussel, H. ^{[2
]}

机构：

[1] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[2] CEA, Lab AIM, Irfu SAp, F-91191 Gif Sur Yvette, France

[3] Univ Vienna, Inst Astronophys, Vienna, Austria

[4] Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France

[5] Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot OX11 0QX, Oxon, England

[6] Univ Crete, Inst Theoret & Computat Phys, GR-71003 Iraklion, Greece

[7] Univ Crete, Dept Phys, GR-71003 Iraklion, Greece

[8] Fdn Res & Technol Hellas, IESL, GR-71110 Iraklion, Greece

[9] Observ Paris, F-75014 Paris, France

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

[11] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92507 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 758卷 / 01期

关键词：

galaxies:; evolution; STAR-FORMING GALAXIES; SIMILAR-TO; 3; CONVERSION FACTOR; HIGH-REDSHIFT; STELLAR; EVOLUTION; UNIVERSE; DENSITY; Z-SIMILAR-TO-3; METALLICITY;

D O I：

10.1088/2041-8205/758/1/L9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present observations of the CO[J = 3 -> 2] emission toward two massive and infrared luminous Lyman break galaxies (LBGs) at z = 3.21 and z = 2.92, using the IRAM Plateau de Bure Interferometer, placing first constraints on the molecular gas masses (M-gas) of non-lensed LBGs. Their overall properties are consistent with those of typical (main-sequence) galaxies at their redshifts, with specific star formation rates similar to 1.6 and similar to 2.2 Gyr(-1), despite their large infrared luminosities (L-IR approximate to (2-3) x 10(12) L-circle dot) derived from Herschel. With one plausible CO detection (spurious detection probability of 10(-3)) and one upper limit, we investigate the evolution of the molecular gas-to-stellar mass ratio (M-gas/M-*) with redshift. Our data suggest that the steep evolution of M-gas/M-* of normal galaxies up to z similar to 2 is followed by a flattening at higher redshifts, providing supporting evidence for the existence of a plateau in the evolution of the specific star formation rate at z > 2.5.

引用

页数：5

共 49 条

[1] Molecular gas in the lensed Lyman break galaxy cB58 [J].