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.
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