Deep wide-field imaging down to the oldest main sequence turn-offs in the Sculptor dwarf spheroidal galaxy
Identifieur interne : 006C09 ( Main/Exploration ); précédent : 006C08; suivant : 006C10Deep wide-field imaging down to the oldest main sequence turn-offs in the Sculptor dwarf spheroidal galaxy
Auteurs : T. J. L. De Boer [Pays-Bas] ; E. Tolstoy [Pays-Bas] ; A. Saha [États-Unis] ; K. Olsen [États-Unis] ; M. J. Irwin [Royaume-Uni] ; G. Battaglia [Allemagne] ; V. Hill [France] ; M. D. Shetrone [États-Unis] ; G. Fiorentino [Pays-Bas] ; A. Cole [Australie]Source :
- Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2011.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
We present wide-field photometry of resolved stars in the nearby Sculptor dwarf spheroidal galaxy using CTIO/MOSAIC, going down to the oldest main sequence turn-off. The accurately flux calibrated wide field colour-magnitude diagrams can be used to constrain the ages of different stellar populations, and also their spatial distribution. The Sculptor dSph contains a predominantly ancient stellar population (> 10 Gyr old) which can be easily resolved into individual stars. A galaxy dominated by an old population provides a clear view of ancient processes of galaxy formation unimpeded by overlying younger populations. By using spectroscopic metallicities of RGB stars in combination with our deep main sequence turn-off photometry we can constrain the ages of different stellar populations with particular accuracy. We find that the known metallicity gradient in Sculptor is well matched to an age gradient. This is the first time that this link with age has been directly quantified. This gradient has been previously observed as a variation in horizontal branch properties and is now confirmed to exist for main sequence turn-offs as well. It is likely the Sculptor dSph first formed an extended metal-poor population at the oldest times, and subsequent more metal-rich, younger stars were formed more towards the centre until the gas was depleted or lost roughly 7 Gyr ago. The fact that these clear radial gradients have been preserved up to the present day is consistent with the apparent lack of signs of recent tidal interactions.
Affiliations:
- Allemagne, Australie, France, Pays-Bas, Royaume-Uni, États-Unis
- Angleterre, Angleterre de l'Est, Groningue (province), Texas
- Austin (Texas), Cambridge, Groningue (ville)
- Université de Cambridge, Université de Groningue, Université du Texas à Austin
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Irwin</name><affiliation wicri:level="4"><inist:fA14 i1="03"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1><s2>Cambridge, CB3 0HA</s2><s3>GBR</s3><sZ>5 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge, CB3 0HA</wicri:noRegion><orgName type="university">Université de Cambridge</orgName><placeName><settlement type="city">Cambridge</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Angleterre de l'Est</region></placeName></affiliation></author><author><name sortKey="Battaglia, G" sort="Battaglia, G" uniqKey="Battaglia G" first="G." last="Battaglia">G. 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Shetrone</name><affiliation wicri:level="4"><inist:fA14 i1="06"><s1>McDonald Observatory, University of Texas at Austin</s1><s2>Fort Davis, TX</s2><s3>USA</s3><sZ>8 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><settlement type="city">Austin (Texas)</settlement><region type="state">Texas</region></placeName><orgName type="university">Université du Texas à Austin</orgName></affiliation></author><author><name sortKey="Fiorentino, G" sort="Fiorentino, G" uniqKey="Fiorentino G" first="G." last="Fiorentino">G. Fiorentino</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Kapteyn Astronomical Institute, University of Groningen, PO Box 800</s1><s2>9700 AV Groningen</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>9700 AV Groningen</wicri:noRegion><orgName type="university">Université de Groningue</orgName><placeName><settlement type="city">Groningue (ville)</settlement><region>Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Cole, A" sort="Cole, A" uniqKey="Cole A" first="A." last="Cole">A. 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J. L." last="De Boer">T. J. L. De Boer</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Kapteyn Astronomical Institute, University of Groningen, PO Box 800</s1><s2>9700 AV Groningen</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>9700 AV Groningen</wicri:noRegion><orgName type="university">Université de Groningue</orgName><placeName><settlement type="city">Groningue (ville)</settlement><region>Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Tolstoy, E" sort="Tolstoy, E" uniqKey="Tolstoy E" first="E." last="Tolstoy">E. Tolstoy</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Kapteyn Astronomical Institute, University of Groningen, PO Box 800</s1><s2>9700 AV Groningen</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>9700 AV Groningen</wicri:noRegion><orgName type="university">Université de Groningue</orgName><placeName><settlement type="city">Groningue (ville)</settlement><region>Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Saha, A" sort="Saha, A" uniqKey="Saha A" first="A." last="Saha">A. Saha</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Optical Astronomy Observatory***, PO box 26732</s1><s2>Tucson, AZ 85726</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Tucson, AZ 85726</wicri:noRegion></affiliation></author><author><name sortKey="Olsen, K" sort="Olsen, K" uniqKey="Olsen K" first="K." last="Olsen">K. Olsen</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Optical Astronomy Observatory***, PO box 26732</s1><s2>Tucson, AZ 85726</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Tucson, AZ 85726</wicri:noRegion></affiliation></author><author><name sortKey="Irwin, M J" sort="Irwin, M J" uniqKey="Irwin M" first="M. J." last="Irwin">M. J. Irwin</name><affiliation wicri:level="4"><inist:fA14 i1="03"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1><s2>Cambridge, CB3 0HA</s2><s3>GBR</s3><sZ>5 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge, CB3 0HA</wicri:noRegion><orgName type="university">Université de Cambridge</orgName><placeName><settlement type="city">Cambridge</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Angleterre de l'Est</region></placeName></affiliation></author><author><name sortKey="Battaglia, G" sort="Battaglia, G" uniqKey="Battaglia G" first="G." last="Battaglia">G. Battaglia</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>European Southern Observatory</s1><s2>Garching bei Munchen</s2><s3>DEU</s3><sZ>6 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>Garching bei Munchen</wicri:noRegion><wicri:noRegion>European Southern Observatory</wicri:noRegion><wicri:noRegion>European Southern Observatory</wicri:noRegion></affiliation></author><author><name sortKey="Hill, V" sort="Hill, V" uniqKey="Hill V" first="V." last="Hill">V. Hill</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Observatoire de la Côte d'azur, CNRS UMR6202, Bd de l'Observatoire, BP 4229</s1><s2>06304 Nice</s2><s3>FRA</s3><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>06304 Nice</wicri:noRegion><wicri:noRegion>BP 4229</wicri:noRegion><wicri:noRegion>06304 Nice</wicri:noRegion></affiliation></author><author><name sortKey="Shetrone, M D" sort="Shetrone, M D" uniqKey="Shetrone M" first="M. D." last="Shetrone">M. D. Shetrone</name><affiliation wicri:level="4"><inist:fA14 i1="06"><s1>McDonald Observatory, University of Texas at Austin</s1><s2>Fort Davis, TX</s2><s3>USA</s3><sZ>8 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><settlement type="city">Austin (Texas)</settlement><region type="state">Texas</region></placeName><orgName type="university">Université du Texas à Austin</orgName></affiliation></author><author><name sortKey="Fiorentino, G" sort="Fiorentino, G" uniqKey="Fiorentino G" first="G." last="Fiorentino">G. Fiorentino</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Kapteyn Astronomical Institute, University of Groningen, PO Box 800</s1><s2>9700 AV Groningen</s2><s3>NLD</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>9700 AV Groningen</wicri:noRegion><orgName type="university">Université de Groningue</orgName><placeName><settlement type="city">Groningue (ville)</settlement><region>Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Cole, A" sort="Cole, A" uniqKey="Cole A" first="A." last="Cole">A. Cole</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>School of Mathematics & Physics, University of Tasmania</s1><s2>Hobart, Tasmania</s2><s3>AUS</s3><sZ>10 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Hobart, Tasmania</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Age</term><term>Color-magnitude diagrams</term><term>Dwarf galaxies</term><term>Dwarf spheroidal galaxies</term><term>Galaxy evolution</term><term>Galaxy formation</term><term>Local group</term><term>Metal-rich stars</term><term>Metallicity</term><term>Photometry</term><term>Radial gradient</term><term>Red giant stars</term><term>Spatial distribution</term><term>Stellar content</term><term>Stellar population</term><term>Tidal interaction</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Galaxies sphéroïdales naines</term><term>Photométrie</term><term>Diagramme magnitude couleur</term><term>Age</term><term>Population stellaire</term><term>Répartition spatiale</term><term>Formation galaxies</term><term>Métallicité</term><term>Géante rouge</term><term>Etoile riche en métal</term><term>Gradient radial</term><term>Interaction tidale</term><term>Galaxies naines</term><term>Evolution galaxies</term><term>Contenu stellaire</term><term>Groupe local</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present wide-field photometry of resolved stars in the nearby Sculptor dwarf spheroidal galaxy using CTIO/MOSAIC, going down to the oldest main sequence turn-off. The accurately flux calibrated wide field colour-magnitude diagrams can be used to constrain the ages of different stellar populations, and also their spatial distribution. The Sculptor dSph contains a predominantly ancient stellar population (> 10 Gyr old) which can be easily resolved into individual stars. A galaxy dominated by an old population provides a clear view of ancient processes of galaxy formation unimpeded by overlying younger populations. By using spectroscopic metallicities of RGB stars in combination with our deep main sequence turn-off photometry we can constrain the ages of different stellar populations with particular accuracy. We find that the known metallicity gradient in Sculptor is well matched to an age gradient. This is the first time that this link with age has been directly quantified. This gradient has been previously observed as a variation in horizontal branch properties and is now confirmed to exist for main sequence turn-offs as well. It is likely the Sculptor dSph first formed an extended metal-poor population at the oldest times, and subsequent more metal-rich, younger stars were formed more towards the centre until the gas was depleted or lost roughly 7 Gyr ago. The fact that these clear radial gradients have been preserved up to the present day is consistent with the apparent lack of signs of recent tidal interactions.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>France</li><li>Pays-Bas</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Angleterre</li><li>Angleterre de l'Est</li><li>Groningue (province)</li><li>Texas</li></region><settlement><li>Austin (Texas)</li><li>Cambridge</li><li>Groningue (ville)</li></settlement><orgName><li>Université de Cambridge</li><li>Université de Groningue</li><li>Université du Texas à Austin</li></orgName></list><tree><country name="Pays-Bas"><region name="Groningue (province)"><name sortKey="De Boer, T J L" sort="De Boer, T J L" uniqKey="De Boer T" first="T. J. L." last="De Boer">T. J. L. De Boer</name></region><name sortKey="Fiorentino, G" sort="Fiorentino, G" uniqKey="Fiorentino G" first="G." last="Fiorentino">G. Fiorentino</name><name sortKey="Tolstoy, E" sort="Tolstoy, E" uniqKey="Tolstoy E" first="E." last="Tolstoy">E. Tolstoy</name></country><country name="États-Unis"><noRegion><name sortKey="Saha, A" sort="Saha, A" uniqKey="Saha A" first="A." last="Saha">A. Saha</name></noRegion><name sortKey="Olsen, K" sort="Olsen, K" uniqKey="Olsen K" first="K." last="Olsen">K. Olsen</name><name sortKey="Shetrone, M D" sort="Shetrone, M D" uniqKey="Shetrone M" first="M. D." last="Shetrone">M. D. Shetrone</name></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Irwin, M J" sort="Irwin, M J" uniqKey="Irwin M" first="M. J." last="Irwin">M. J. Irwin</name></region></country><country name="Allemagne"><noRegion><name sortKey="Battaglia, G" sort="Battaglia, G" uniqKey="Battaglia G" first="G." last="Battaglia">G. Battaglia</name></noRegion></country><country name="France"><noRegion><name sortKey="Hill, V" sort="Hill, V" uniqKey="Hill V" first="V." last="Hill">V. Hill</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Cole, A" sort="Cole, A" uniqKey="Cole A" first="A." last="Cole">A. Cole</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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