AustralieFrV1, Main, Exploration, bibRecord, 005A37

OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY

Identifieur interne : 005A37 ( Main/Exploration ); précédent : 005A36; suivant : 005A38

OBSERVATIONAL 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.

RBID : Pascal:12-0421291

Descripteurs français

Pascal (Inist)
- Galaxies, Gaz moléculaire, Mirage gravitationnel, Position, Déplacement vers le rouge, Observatoire spatial, Spectrométrie, Luminosité, Formation galaxies, Formation stellaire.
Wicri :
- topic : Spectrométrie.

English descriptors

KwdEn :
- Galaxies, Galaxy formation, Gravitational lensing, Luminosity, Molecular gas, Positions, Red shift, Spatial observatory, Spectroscopy, Star formation.

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 M_gas∼ 1⁺¹_-0.6 × 10⁹ M_◦.. Combined with the existing data, we derive a gas fraction M_gas/(M_gas + 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.

Affiliations:

Australie, Canada, France, Pays-Bas, Royaume-Uni
Québec
Montréal
Université McGill

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Le document en format XML

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<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>
<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>

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OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY

OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY

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