First detection of [CII]158 μm at high redshift:: vigorous star formation in the early universe

被引:223
作者
Maiolino, R
Cox, P
Caselli, P
Beelen, A
Bertoldi, F
Carilli, CL
Kaufman, MJK
Menten, KM
Nagao, T
Omont, A
Weiss, A
Walmsley, CM
Walter, F
机构
[1] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy
[2] Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France
[3] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[4] Univ Bonn, Inst Radioastron, D-53121 Bonn, Germany
[5] Natl Radio Astron Observ, Socorro, NM 87801 USA
[6] San Jose State Univ, Dept Phys, San Jose, CA 95192 USA
[7] Natl Astron Observ Japan, Tokyo 1818588, Japan
[8] Univ Paris 06, CNRS, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France
[9] Inst Radio Astron Millimetr, Granada, Spain
[10] Max Planck Inst Astron, D-69117 Heidelberg, Germany
关键词
galaxies : high redshift; galaxies : ISM; quasars : individual : J114816.64+525150.3; infrared : galaxies; submillimeter; ISM : abundances;
D O I
10.1051/0004-6361:200500165
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the detection of the P-2(3/2) -> P-2(1/2) fine-structure line of C+ at 157.74 mu m in SDSS J114816.64+525150.3 ( hereafter J1148+5251), the most distant known quasar, at z = 6.42, using the IRAM 30-m telescope. This is the first detection of the [CII] line at high redshift, and also the first detection in a Hyperluminous Infrared Galaxy (L-FIR > 10(13) L-circle dot). The [CII] line is detected at a significance level of 8 sigma and has a luminosity of 4.4 x 10(9) L-circle dot. The [CII]/FIR ratio is 2 x 10(-4), about an order, of magnitude smaller than observed in local normal galaxies and similar to the ratio observed in local Ultraluminous Infrared Galaxies. The [CII] line luminosity indicates that the host galaxy of this quasar is undergoing an intense burst of star formation with an estimated rate of approximate to 3000 M-circle dot yr(-1). The detection of C+ in SDSS J1148+ 5251 suggests a significant enrichment of metals at z similar to 6 (age of the universe similar to 870 Myr), although the data are consistent with a reduced carbon to oxygen ratio as expected from chemical evolutionary models of the early phases of galaxy formation.
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页码:L51 / L54
页数:4
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