OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY
Identifieur interne : 000E98 ( PascalFrancis/Checkpoint ); précédent : 000E97; suivant : 000E99OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY
Auteurs : R. C. Livermore [Royaume-Uni] ; A. M. Swinbank [Royaume-Uni] ; Ian Smail [Royaume-Uni] ; R. G. Bower [Royaume-Uni] ; K. E. K. Coppin [Royaume-Uni, Canada] ; R. A. Crain [Australie, Pays-Bas] ; A. C. Edge [Royaume-Uni] ; J. E. Geach [Royaume-Uni, Canada] ; J. Richard [Royaume-Uni, France]Source :
- The Astrophysical journal [ 0004-637X ] ; 2012.
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- topic : Spectrométrie.
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Abstract
We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22 ± 5x due to strong gravitational lensing by the foreground cluster MS 1358+62. We target the CO(5-4) emission at a known position and redshift from existing Hubble Space Telescope/Advanced Camera for Surveys imaging and Gemini/NIFS [O II]3727 imaging spectroscopy, and obtain a tentative detection at the 4.3σ level with a flux of 0. 104 ± 0.024 Jy km s-1. From the CO line luminosity and assuming a CO-to-H2 conversion factor α = 2, we derive a gas mass Mgas ∼ 1+1-0.6 × 109 M◦.. Combined with the existing data, we derive a gas fraction Mgas/(Mgas + M*) = 0.59+0.11-0.06. The faint line flux of this galaxy highlights the difficulty of observing molecular gas in representative galaxies at this epoch, and suggests that routine detections of similar galaxies in the absence of gravitational lensing will remain challenging even with ALMA in full science operations.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY</title><author><name sortKey="Livermore, R C" sort="Livermore, R C" uniqKey="Livermore R" first="R. C." last="Livermore">R. C. Livermore</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Swinbank, A M" sort="Swinbank, A M" uniqKey="Swinbank A" first="A. M." last="Swinbank">A. M. Swinbank</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Smail, Ian" sort="Smail, Ian" uniqKey="Smail I" first="Ian" last="Smail">Ian Smail</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Bower, R G" sort="Bower, R G" uniqKey="Bower R" first="R. G." last="Bower">R. G. Bower</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Coppin, K E K" sort="Coppin, K E K" uniqKey="Coppin K" first="K. E. K." last="Coppin">K. E. K. Coppin</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Department of Physics, McGill University, 3600 me University</s1><s2>Montréal, QC H3A 2T8</s2><s3>CAN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Montréal, QC H3A 2T8</wicri:noRegion><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Crain, R A" sort="Crain, R A" uniqKey="Crain R" first="R. A." last="Crain">R. A. Crain</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218</s1><s2>Hawthorn, Victoria 3122</s2><s3>AUS</s3><sZ>6 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Hawthorn, Victoria 3122</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Leiden Observatory, Leiden University, PO Box 9513</s1><s2>2300 RA Leiden</s2><s3>NLD</s3><sZ>6 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>2300 RA Leiden</wicri:noRegion></affiliation></author><author><name sortKey="Edge, A C" sort="Edge, A C" uniqKey="Edge A" first="A. C." last="Edge">A. C. Edge</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Geach, J E" sort="Geach, J E" uniqKey="Geach J" first="J. E." last="Geach">J. E. Geach</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Department of Physics, McGill University, 3600 me University</s1><s2>Montréal, QC H3A 2T8</s2><s3>CAN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Montréal, QC H3A 2T8</wicri:noRegion><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Richard, J" sort="Richard, J" uniqKey="Richard J" first="J." last="Richard">J. Richard</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>CRAL, Observatoire de Lyon, 9 Avenue Charles André</s1><s2>69561 Saint-Genis-Laval</s2><s3>FRA</s3><sZ>9 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>69561 Saint-Genis-Laval</wicri:noRegion><wicri:noRegion>9 Avenue Charles André</wicri:noRegion><wicri:noRegion>69561 Saint-Genis-Laval</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">12-0421291</idno><date when="2012">2012</date><idno type="stanalyst">PASCAL 12-0421291 INIST</idno><idno type="RBID">Pascal:12-0421291</idno><idno type="wicri:Area/PascalFrancis/Corpus">000F12</idno><idno type="wicri:Area/PascalFrancis/Curation">005009</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000E98</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000E98</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY</title><author><name sortKey="Livermore, R C" sort="Livermore, R C" uniqKey="Livermore R" first="R. C." last="Livermore">R. C. Livermore</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Swinbank, A M" sort="Swinbank, A M" uniqKey="Swinbank A" first="A. M." last="Swinbank">A. M. Swinbank</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Smail, Ian" sort="Smail, Ian" uniqKey="Smail I" first="Ian" last="Smail">Ian Smail</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Bower, R G" sort="Bower, R G" uniqKey="Bower R" first="R. G." last="Bower">R. G. Bower</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Coppin, K E K" sort="Coppin, K E K" uniqKey="Coppin K" first="K. E. K." last="Coppin">K. E. K. Coppin</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Department of Physics, McGill University, 3600 me University</s1><s2>Montréal, QC H3A 2T8</s2><s3>CAN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Montréal, QC H3A 2T8</wicri:noRegion><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Crain, R A" sort="Crain, R A" uniqKey="Crain R" first="R. A." last="Crain">R. A. Crain</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218</s1><s2>Hawthorn, Victoria 3122</s2><s3>AUS</s3><sZ>6 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Hawthorn, Victoria 3122</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Leiden Observatory, Leiden University, PO Box 9513</s1><s2>2300 RA Leiden</s2><s3>NLD</s3><sZ>6 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>2300 RA Leiden</wicri:noRegion></affiliation></author><author><name sortKey="Edge, A C" sort="Edge, A C" uniqKey="Edge A" first="A. C." last="Edge">A. C. Edge</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation></author><author><name sortKey="Geach, J E" sort="Geach, J E" uniqKey="Geach J" first="J. E." last="Geach">J. E. Geach</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Department of Physics, McGill University, 3600 me University</s1><s2>Montréal, QC H3A 2T8</s2><s3>CAN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Montréal, QC H3A 2T8</wicri:noRegion><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Richard, J" sort="Richard, J" uniqKey="Richard J" first="J." last="Richard">J. Richard</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Durham DH1 3LE</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>CRAL, Observatoire de Lyon, 9 Avenue Charles André</s1><s2>69561 Saint-Genis-Laval</s2><s3>FRA</s3><sZ>9 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>69561 Saint-Genis-Laval</wicri:noRegion><wicri:noRegion>9 Avenue Charles André</wicri:noRegion><wicri:noRegion>69561 Saint-Genis-Laval</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">The Astrophysical journal</title><title level="j" type="abbreviated">Astrophys. j.</title><idno type="ISSN">0004-637X</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">The Astrophysical journal</title><title level="j" type="abbreviated">Astrophys. j.</title><idno type="ISSN">0004-637X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Galaxies</term><term>Galaxy formation</term><term>Gravitational lensing</term><term>Luminosity</term><term>Molecular gas</term><term>Positions</term><term>Red shift</term><term>Spatial observatory</term><term>Spectroscopy</term><term>Star formation</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Galaxies</term><term>Gaz moléculaire</term><term>Mirage gravitationnel</term><term>Position</term><term>Déplacement vers le rouge</term><term>Observatoire spatial</term><term>Spectrométrie</term><term>Luminosité</term><term>Formation galaxies</term><term>Formation stellaire</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Spectrométrie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22 ± 5x due to strong gravitational lensing by the foreground cluster MS 1358+62. We target the CO(5-4) emission at a known position and redshift from existing Hubble Space Telescope/Advanced Camera for Surveys imaging and Gemini/NIFS [O II]3727 imaging spectroscopy, and obtain a tentative detection at the 4.3σ level with a flux of 0. 104 ± 0.024 Jy km s<sup>-1</sup>. From the CO line luminosity and assuming a CO-to-H<sub>2</sub> conversion factor α = 2, we derive a gas mass M<sub>gas </sub>∼ 1<sup>+1</sup><sub>-0.6</sub> × 10<sup>9</sup> M<sub>◦.</sub>. Combined with the existing data, we derive a gas fraction M<sub>gas</sub>/(M<sub>gas</sub> + M<sub>*</sub>) = 0.59<sup>+0.11</sup><sub>-0.06</sub>. The faint line flux of this galaxy highlights the difficulty of observing molecular gas in representative galaxies at this epoch, and suggests that routine detections of similar galaxies in the absence of gravitational lensing will remain challenging even with ALMA in full science operations.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0004-637X</s0></fA01><fA02 i1="01"><s0>ASJOAB</s0></fA02><fA03 i2="1"><s0>Astrophys. j.</s0></fA03><fA05><s2>758</s2></fA05><fA06><s2>2</s2><s3>p. 2</s3></fA06><fA08 i1="01" i2="1" l="ENG"><s1>OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY</s1></fA08><fA11 i1="01" i2="1"><s1>LIVERMORE (R. C.)</s1></fA11><fA11 i1="02" i2="1"><s1>SWINBANK (A. M.)</s1></fA11><fA11 i1="03" i2="1"><s1>SMAIL (Ian)</s1></fA11><fA11 i1="04" i2="1"><s1>BOWER (R. G.)</s1></fA11><fA11 i1="05" i2="1"><s1>COPPIN (K. E. K.)</s1></fA11><fA11 i1="06" i2="1"><s1>CRAIN (R. A.)</s1></fA11><fA11 i1="07" i2="1"><s1>EDGE (A. C.)</s1></fA11><fA11 i1="08" i2="1"><s1>GEACH (J. E.)</s1></fA11><fA11 i1="09" i2="1"><s1>RICHARD (J.)</s1></fA11><fA14 i1="01"><s1>Institute for Computational Cosmology, Durham University, South Road</s1><s2>Durham DH1 3LE</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></fA14><fA14 i1="02"><s1>Department of Physics, McGill University, 3600 me University</s1><s2>Montréal, QC H3A 2T8</s2><s3>CAN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></fA14><fA14 i1="03"><s1>Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218</s1><s2>Hawthorn, Victoria 3122</s2><s3>AUS</s3><sZ>6 aut.</sZ></fA14><fA14 i1="04"><s1>Leiden Observatory, Leiden University, PO Box 9513</s1><s2>2300 RA Leiden</s2><s3>NLD</s3><sZ>6 aut.</sZ></fA14><fA14 i1="05"><s1>CRAL, Observatoire de Lyon, 9 Avenue Charles André</s1><s2>69561 Saint-Genis-Laval</s2><s3>FRA</s3><sZ>9 aut.</sZ></fA14><fA20><s2>L35.1-L35.5</s2></fA20><fA21><s1>2012</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>512</s2><s5>354000505368390110</s5></fA43><fA44><s0>0000</s0><s1>© 2012 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>1/4 p.</s0></fA45><fA47 i1="01" i2="1"><s0>12-0421291</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>The Astrophysical journal</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22 ± 5x due to strong gravitational lensing by the foreground cluster MS 1358+62. We target the CO(5-4) emission at a known position and redshift from existing Hubble Space Telescope/Advanced Camera for Surveys imaging and Gemini/NIFS [O II]3727 imaging spectroscopy, and obtain a tentative detection at the 4.3σ level with a flux of 0. 104 ± 0.024 Jy km s<sup>-1</sup>. From the CO line luminosity and assuming a CO-to-H<sub>2</sub> conversion factor α = 2, we derive a gas mass M<sub>gas </sub>∼ 1<sup>+1</sup><sub>-0.6</sub> × 10<sup>9</sup> M<sub>◦.</sub>. Combined with the existing data, we derive a gas fraction M<sub>gas</sub>/(M<sub>gas</sub> + M<sub>*</sub>) = 0.59<sup>+0.11</sup><sub>-0.06</sub>. The faint line flux of this galaxy highlights the difficulty of observing molecular gas in representative galaxies at this epoch, and suggests that routine detections of similar galaxies in the absence of gravitational lensing will remain challenging even with ALMA in full science operations.</s0></fC01><fC02 i1="01" i2="3"><s0>001E03</s0></fC02><fC03 i1="01" i2="3" l="FRE"><s0>Galaxies</s0><s5>26</s5></fC03><fC03 i1="01" i2="3" l="ENG"><s0>Galaxies</s0><s5>26</s5></fC03><fC03 i1="02" i2="X" l="FRE"><s0>Gaz moléculaire</s0><s5>27</s5></fC03><fC03 i1="02" i2="X" l="ENG"><s0>Molecular gas</s0><s5>27</s5></fC03><fC03 i1="02" i2="X" l="SPA"><s0>Gas molecular</s0><s5>27</s5></fC03><fC03 i1="03" i2="X" l="FRE"><s0>Mirage gravitationnel</s0><s5>28</s5></fC03><fC03 i1="03" i2="X" l="ENG"><s0>Gravitational lensing</s0><s5>28</s5></fC03><fC03 i1="03" i2="X" l="SPA"><s0>Espejismo gravitacional</s0><s5>28</s5></fC03><fC03 i1="04" i2="3" l="FRE"><s0>Position</s0><s5>29</s5></fC03><fC03 i1="04" i2="3" l="ENG"><s0>Positions</s0><s5>29</s5></fC03><fC03 i1="05" i2="3" l="FRE"><s0>Déplacement vers le rouge</s0><s5>30</s5></fC03><fC03 i1="05" i2="3" l="ENG"><s0>Red shift</s0><s5>30</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Observatoire spatial</s0><s5>31</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Spatial observatory</s0><s5>31</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Observatorio espacial</s0><s5>31</s5></fC03><fC03 i1="07" i2="3" l="FRE"><s0>Spectrométrie</s0><s5>32</s5></fC03><fC03 i1="07" i2="3" l="ENG"><s0>Spectroscopy</s0><s5>32</s5></fC03><fC03 i1="08" i2="3" l="FRE"><s0>Luminosité</s0><s5>33</s5></fC03><fC03 i1="08" i2="3" l="ENG"><s0>Luminosity</s0><s5>33</s5></fC03><fC03 i1="09" i2="3" l="FRE"><s0>Formation galaxies</s0><s5>34</s5></fC03><fC03 i1="09" i2="3" l="ENG"><s0>Galaxy formation</s0><s5>34</s5></fC03><fC03 i1="10" i2="3" l="FRE"><s0>Formation stellaire</s0><s5>35</s5></fC03><fC03 i1="10" i2="3" l="ENG"><s0>Star formation</s0><s5>35</s5></fC03><fN21><s1>331</s1></fN21><fN44 i1="01"><s1>OTO</s1></fN44><fN82><s1>OTO</s1></fN82></pA></standard></inist><affiliations><list><country><li>Australie</li><li>Canada</li><li>France</li><li>Pays-Bas</li><li>Royaume-Uni</li></country><region><li>Québec</li></region><settlement><li>Montréal</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="Royaume-Uni"><noRegion><name sortKey="Livermore, R C" sort="Livermore, R C" uniqKey="Livermore R" first="R. C." last="Livermore">R. C. Livermore</name></noRegion><name sortKey="Bower, R G" sort="Bower, R G" uniqKey="Bower R" first="R. G." last="Bower">R. G. Bower</name><name sortKey="Coppin, K E K" sort="Coppin, K E K" uniqKey="Coppin K" first="K. E. K." last="Coppin">K. E. K. Coppin</name><name sortKey="Edge, A C" sort="Edge, A C" uniqKey="Edge A" first="A. C." last="Edge">A. C. Edge</name><name sortKey="Geach, J E" sort="Geach, J E" uniqKey="Geach J" first="J. E." last="Geach">J. E. Geach</name><name sortKey="Richard, J" sort="Richard, J" uniqKey="Richard J" first="J." last="Richard">J. Richard</name><name sortKey="Smail, Ian" sort="Smail, Ian" uniqKey="Smail I" first="Ian" last="Smail">Ian Smail</name><name sortKey="Swinbank, A M" sort="Swinbank, A M" uniqKey="Swinbank A" first="A. M." last="Swinbank">A. M. Swinbank</name></country><country name="Canada"><region name="Québec"><name sortKey="Coppin, K E K" sort="Coppin, K E K" uniqKey="Coppin K" first="K. E. K." last="Coppin">K. E. K. Coppin</name></region><name sortKey="Geach, J E" sort="Geach, J E" uniqKey="Geach J" first="J. E." last="Geach">J. E. Geach</name></country><country name="Australie"><noRegion><name sortKey="Crain, R A" sort="Crain, R A" uniqKey="Crain R" first="R. A." last="Crain">R. A. Crain</name></noRegion></country><country name="Pays-Bas"><noRegion><name sortKey="Crain, R A" sort="Crain, R A" uniqKey="Crain R" first="R. A." last="Crain">R. A. Crain</name></noRegion></country><country name="France"><noRegion><name sortKey="Richard, J" sort="Richard, J" uniqKey="Richard J" first="J." last="Richard">J. Richard</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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