Deep Gemini/GMOS imaging of an extremely isolated globular cluster in the Local Group
Identifieur interne : 000E70 ( Istex/Curation ); précédent : 000E69; suivant : 000E71Deep Gemini/GMOS imaging of an extremely isolated globular cluster in the Local Group
Auteurs : A. D. Mackey [Royaume-Uni] ; A. M. N. Ferguson [Royaume-Uni] ; M. J. Irwin [Royaume-Uni] ; N. F. Martin [Allemagne] ; A. P. Huxor ; N. R. Tanvir ; S. C. Chapman [Royaume-Uni] ; R. A. Ibata [France] ; G. F. Lewis [Australie] ; A. W. Mcconnachie [Canada]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2010-01-01.
Abstract
We report on deep imaging of a remote M31 globular cluster, MGC1, obtained with Gemini/GMOS. Our colour–magnitude diagram for this object extends ∼5 mag below the tip of the red-giant branch and exhibits features consistent with an ancient metal-poor stellar population, including a long, well-populated horizontal branch. The red-giant branch locus suggests MGC1 has a metal abundance [M/H]≈−2.3. We measure the distance to MGC1 and find that it lies ∼160 kpc in front of M31 with a distance modulus μ= 23.95 ± 0.06. Combined with its large projected separation of Rp= 117 kpc from M31, this implies a deprojected radius of Rgc= 200 ± 20 kpc, rendering it the most isolated known globular cluster in the Local Group by some considerable margin. We construct a radial brightness profile for MGC1 and show that it is both centrally compact and rather luminous, with MV=−9.2. Remarkably, the cluster profile shows no evidence for a tidal limit and we are able to trace it to a radius of at least 450 pc, and possibly as far as ∼900 pc. The profile exhibits a power-law fall-off with exponent γ=−2.5, breaking to γ=−3.5 in its outermost parts. This core-halo structure is broadly consistent with expectations derived from numerical models, and suggests that MGC1 has spent many gigayears in isolation.
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DOI: 10.1111/j.1365-2966.2009.15678.x
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A. D. Mackey<affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: dmy@roe.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation><affiliation><mods:affiliation>Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL</mods:affiliation><wicri:noCountry code="subField">1TL</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation>Le document en format XML
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Ferguson</name><affiliation wicri:level="4"><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><orgName type="university">Université d'Édimbourg</orgName><country>Royaume-Uni</country><placeName><settlement type="city">Édimbourg</settlement><region type="country">Écosse</region></placeName></affiliation></author><author><name sortKey="Irwin, M J" sort="Irwin, M J" uniqKey="Irwin M" first="M. J." last="Irwin">M. J. 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Huxor</name><affiliation><mods:affiliation>Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL</mods:affiliation><wicri:noCountry code="subField">1TL</wicri:noCountry></affiliation></author><author><name sortKey="Tanvir, N R" sort="Tanvir, N R" uniqKey="Tanvir N" first="N. R." last="Tanvir">N. R. Tanvir</name><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation></author><author><name sortKey="Chapman, S C" sort="Chapman, S C" uniqKey="Chapman S" first="S. C." last="Chapman">S. C. Chapman</name><affiliation wicri:level="4"><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><orgName type="university">Université de Cambridge</orgName><country>Royaume-Uni</country><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="Ibata, R A" sort="Ibata, R A" uniqKey="Ibata R" first="R. A." last="Ibata">R. A. Ibata</name><affiliation wicri:level="1"><mods:affiliation>Observatoire Astronomique, Université de Strasbourg, CNRS, 11, rue de l'Université, F-67000 Strasbourg, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Observatoire Astronomique, Université de Strasbourg, CNRS, 11, rue de l'Université, F-67000 Strasbourg</wicri:regionArea></affiliation></author><author><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name><affiliation wicri:level="1"><mods:affiliation>Institute of Astronomy, School of Physics, A29, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Mcconnachie, A W" sort="Mcconnachie, A W" uniqKey="Mcconnachie A" first="A. W." last="Mcconnachie">A. W. Mcconnachie</name><affiliation wicri:level="1"><mods:affiliation>NRC Herzberg Institute for Astrophysics, 5071 West Saanich Road, Victoria, British Columbia V9E 2E7, Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>NRC Herzberg Institute for Astrophysics, 5071 West Saanich Road, Victoria, British Columbia V9E 2E7</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-01-01">2010-01-01</date><biblScope unit="volume">401</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="533">533</biblScope><biblScope unit="page" to="546">546</biblScope></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">We report on deep imaging of a remote M31 globular cluster, MGC1, obtained with Gemini/GMOS. Our colour–magnitude diagram for this object extends ∼5 mag below the tip of the red-giant branch and exhibits features consistent with an ancient metal-poor stellar population, including a long, well-populated horizontal branch. The red-giant branch locus suggests MGC1 has a metal abundance [M/H]≈−2.3. We measure the distance to MGC1 and find that it lies ∼160 kpc in front of M31 with a distance modulus μ= 23.95 ± 0.06. Combined with its large projected separation of Rp= 117 kpc from M31, this implies a deprojected radius of Rgc= 200 ± 20 kpc, rendering it the most isolated known globular cluster in the Local Group by some considerable margin. We construct a radial brightness profile for MGC1 and show that it is both centrally compact and rather luminous, with MV=−9.2. Remarkably, the cluster profile shows no evidence for a tidal limit and we are able to trace it to a radius of at least 450 pc, and possibly as far as ∼900 pc. The profile exhibits a power-law fall-off with exponent γ=−2.5, breaking to γ=−3.5 in its outermost parts. This core-halo structure is broadly consistent with expectations derived from numerical models, and suggests that MGC1 has spent many gigayears in isolation.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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