The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From l= (193–276)°
Identifieur interne : 009A59 ( Main/Merge ); précédent : 009A58; suivant : 009A60The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From l= (193–276)°
Auteurs : Blair C. Conn [Australie, Chili] ; Richard R. Lane [Australie] ; Geraint F. Lewis [Australie] ; Rodrigo Gil-Merino [Australie] ; Mike J. Irwin ; Rodrigo A. Ibata [France] ; Nicolas F. Martin [France] ; Michele Bellazzini [Italie] ; Robert Sharp [Australie] ; Artem V. Tuntsov [Australie] ; Annette M. N. Ferguson [Royaume-Uni]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2007-04-11.
English descriptors
- KwdEn :
- 2mass, 2mass catalogue, Ared disc, Bellazzini, Besan, Carraro, Cent completeness, Cent completeness level, Centre, Clump stars, Cmds, Colour, Completeness, Completeness estimate, Conn, Corresponding besan, Data quality, Detection, Disc, Distance estimate, Distance estimates, Distant spiral, Dominant sequence, Ducial, Ducial sequence, Ducial sequences, Ducials, Dust extinction, Dwarf, Dwarf galaxies, Dwarf galaxy, Eld, Empty symbols, Fainter, Fainter magnitudes, Fainter sequence, February, Galactic, Galactic centre, Galactic components, Galactic disc, Galactic longitude, Galactic plane, Galactic warp, Galaxy, Grillmair, Gure, Halo, Heliocentric, Heliocentric distance, Hess, Hess plot, Hess plots, Ibata, Irwin, January, Journal compilation, Lled symbols, Longitude, Lower panel, Main sequence, Main sequences, Mnras, Momany, Monoceros ring, More stars, Newberg, Number density, Outer disc, Outer spiral, Overdensity, Pointings, Present paper, Present survey, Ratio estimate, Robin, Scenario, Sdss, Spiral arms, Square root, Star, Star symbols, Stellar, Stellar densities, Stellar density, Stellar populations, Strong sequence, Synthetic galaxy model, Tanvir, Thick disc, Thin disc, Tidal, Tted, Vega system, Vertical lines, Warp, Yusifov.
- Teeft :
- 2mass, 2mass catalogue, Ared disc, Bellazzini, Besan, Carraro, Cent completeness, Cent completeness level, Centre, Clump stars, Cmds, Colour, Completeness, Completeness estimate, Conn, Corresponding besan, Data quality, Detection, Disc, Distance estimate, Distance estimates, Distant spiral, Dominant sequence, Ducial, Ducial sequence, Ducial sequences, Ducials, Dust extinction, Dwarf, Dwarf galaxies, Dwarf galaxy, Eld, Empty symbols, Fainter, Fainter magnitudes, Fainter sequence, February, Galactic, Galactic centre, Galactic components, Galactic disc, Galactic longitude, Galactic plane, Galactic warp, Galaxy, Grillmair, Gure, Halo, Heliocentric, Heliocentric distance, Hess, Hess plot, Hess plots, Ibata, Irwin, January, Journal compilation, Lled symbols, Longitude, Lower panel, Main sequence, Main sequences, Mnras, Momany, Monoceros ring, More stars, Newberg, Number density, Outer disc, Outer spiral, Overdensity, Pointings, Present paper, Present survey, Ratio estimate, Robin, Scenario, Sdss, Spiral arms, Square root, Star, Star symbols, Stellar, Stellar densities, Stellar density, Stellar populations, Strong sequence, Synthetic galaxy model, Tanvir, Thick disc, Thin disc, Tidal, Tted, Vega system, Vertical lines, Warp, Yusifov.
Abstract
We present the results of an Anglo‐Australian Telescope (AAT) wide field camera survey of the stars in the Monoceros Ring (MRi) and purported Canis Major (CMa) overdensity in the Galactic longitudes of l= (193–276)°. Current numerical simulations suggest that both of these structures are the result of a single on‐going accretion event, although an alternative solution is that the warped and flared disc of the Galaxy can explain the origin of both of these structures. Our results show that, with regards the MRi, the warped and flared disc is unable to reproduce the locations and strengths of the detections observed around the Galaxy. This supports a non‐Galactic origin for this structure. We report eight new detections and two tentative detections of the MRi in this survey. The exact nature of the CMa overdensity is still unresolved, although this survey provides evidence that invoking the Galactic warp is not a sufficient solution when compared with observation. Several fields in this survey are highly inconsistent with the current Galactic disc models that include a warp and flare, to such an extent that explaining their origins with these structures is problematic. We also report that the blue plume stars previously invoked to support the dwarf galaxy hypothesis are unfounded, and associating them with an outer spiral arm is equally problematic. Standard Galactic models are unable to accommodate all the observations of these new structures, leading away from a warped/flared disc explanation for their origins and more toward a non‐Galactic source. Additionally, evidence is presented in favour of a detection of the CMa dwarf stream away from the CMa region. As the outer reaches of the Galactic disc continue to be probed, the fascinating structures that are the MRi and CMa overdensity will no doubt continue to inform us of the unique structure and formation of the Milky Way.
Url:
- https://api.istex.fr/document/588B3A4D79438292A0795B27F32EF0CC09B2B3ED/fulltext/pdf
- https://api.istex.fr/document/35E3F1AA1B3C2E41144A75C137C4FB533036C0DB/fulltext/pdf
DOI: 10.1111/j.1365-2966.2007.11503.x
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sequence</term><term>February</term><term>Galactic</term><term>Galactic centre</term><term>Galactic components</term><term>Galactic disc</term><term>Galactic longitude</term><term>Galactic plane</term><term>Galactic warp</term><term>Galaxy</term><term>Grillmair</term><term>Gure</term><term>Halo</term><term>Heliocentric</term><term>Heliocentric distance</term><term>Hess</term><term>Hess plot</term><term>Hess plots</term><term>Ibata</term><term>Irwin</term><term>January</term><term>Journal compilation</term><term>Lled symbols</term><term>Longitude</term><term>Lower panel</term><term>Main sequence</term><term>Main sequences</term><term>Mnras</term><term>Momany</term><term>Monoceros ring</term><term>More stars</term><term>Newberg</term><term>Number density</term><term>Outer disc</term><term>Outer spiral</term><term>Overdensity</term><term>Pointings</term><term>Present paper</term><term>Present survey</term><term>Ratio 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type="abstract" xml:lang="en">We present the results of an Anglo‐Australian Telescope (AAT) wide field camera survey of the stars in the Monoceros Ring (MRi) and purported Canis Major (CMa) overdensity in the Galactic longitudes of l= (193–276)°. Current numerical simulations suggest that both of these structures are the result of a single on‐going accretion event, although an alternative solution is that the warped and flared disc of the Galaxy can explain the origin of both of these structures. Our results show that, with regards the MRi, the warped and flared disc is unable to reproduce the locations and strengths of the detections observed around the Galaxy. This supports a non‐Galactic origin for this structure. We report eight new detections and two tentative detections of the MRi in this survey. The exact nature of the CMa overdensity is still unresolved, although this survey provides evidence that invoking the Galactic warp is not a sufficient solution when compared with observation. Several fields in this survey are highly inconsistent with the current Galactic disc models that include a warp and flare, to such an extent that explaining their origins with these structures is problematic. We also report that the blue plume stars previously invoked to support the dwarf galaxy hypothesis are unfounded, and associating them with an outer spiral arm is equally problematic. Standard Galactic models are unable to accommodate all the observations of these new structures, leading away from a warped/flared disc explanation for their origins and more toward a non‐Galactic source. Additionally, evidence is presented in favour of a detection of the CMa dwarf stream away from the CMa region. As the outer reaches of the Galactic disc continue to be probed, the fascinating structures that are the MRi and CMa overdensity will no doubt continue to inform us of the unique structure and formation of the Milky Way.</div></front></TEI><double doi="10.1111/j.1365-2966.2007.11503.x"><ISTEX><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From l= (193–276)°</title><author><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name></author><author><name sortKey="Lane, Richard R" sort="Lane, Richard R" uniqKey="Lane R" first="Richard R." last="Lane">Richard R. Lane</name></author><author><name sortKey="Lewis, Geraint F" sort="Lewis, Geraint F" uniqKey="Lewis G" first="Geraint F." last="Lewis">Geraint F. Lewis</name></author><author><name sortKey="Gil Erino, Rodrigo" sort="Gil Erino, Rodrigo" uniqKey="Gil Erino R" first="Rodrigo" last="Gil-Merino">Rodrigo Gil-Merino</name></author><author><name sortKey="Irwin, Mike J" sort="Irwin, Mike J" uniqKey="Irwin M" first="Mike J." last="Irwin">Mike J. Irwin</name></author><author><name sortKey="Ibata, Rodrigo A" sort="Ibata, Rodrigo A" uniqKey="Ibata R" first="Rodrigo A." last="Ibata">Rodrigo A. Ibata</name></author><author><name sortKey="Martin, Nicolas F" sort="Martin, Nicolas F" uniqKey="Martin N" first="Nicolas F." last="Martin">Nicolas F. Martin</name></author><author><name sortKey="Bellazzini, Michele" sort="Bellazzini, Michele" uniqKey="Bellazzini M" first="Michele" last="Bellazzini">Michele Bellazzini</name></author><author><name sortKey="Sharp, Robert" sort="Sharp, Robert" uniqKey="Sharp R" first="Robert" last="Sharp">Robert Sharp</name></author><author><name sortKey="Tuntsov, Artem V" sort="Tuntsov, Artem V" uniqKey="Tuntsov A" first="Artem V." last="Tuntsov">Artem V. Tuntsov</name></author><author><name sortKey="Ferguson, Annette M N" sort="Ferguson, Annette M N" uniqKey="Ferguson A" first="Annette M. N." last="Ferguson">Annette M. N. Ferguson</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:588B3A4D79438292A0795B27F32EF0CC09B2B3ED</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1111/j.1365-2966.2007.11503.x</idno><idno type="url">https://api.istex.fr/document/588B3A4D79438292A0795B27F32EF0CC09B2B3ED/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001073</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001073</idno><idno type="wicri:Area/Istex/Curation">001073</idno><idno type="wicri:Area/Istex/Checkpoint">001335</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">001335</idno><idno type="wicri:doubleKey">0035-8711:2007:Conn B:the:aat:wfi</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main">The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From <hi rend="italic">l</hi>= (193–276)°</title><author><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Chili</country><wicri:regionArea>European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago</wicri:regionArea><wicri:noRegion>Santiago</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Lane, Richard R" sort="Lane, Richard R" uniqKey="Lane R" first="Richard R." last="Lane">Richard R. Lane</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Lewis, Geraint F" sort="Lewis, Geraint F" uniqKey="Lewis G" first="Geraint F." last="Lewis">Geraint F. Lewis</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Gil Erino, Rodrigo" sort="Gil Erino, Rodrigo" uniqKey="Gil Erino R" first="Rodrigo" last="Gil-Merino">Rodrigo Gil-Merino</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Irwin, Mike J" sort="Irwin, Mike J" uniqKey="Irwin M" first="Mike J." last="Irwin">Mike J. Irwin</name><affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Ibata, Rodrigo A" sort="Ibata, Rodrigo A" uniqKey="Ibata R" first="Rodrigo A." last="Ibata">Rodrigo A. Ibata</name><affiliation wicri:level="1"><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Strasbourg, 11 rue de l'Université, F‐67000 Strasbourg</wicri:regionArea><wicri:noRegion>67000 Strasbourg</wicri:noRegion><wicri:noRegion>F‐67000 Strasbourg</wicri:noRegion></affiliation></author><author><name sortKey="Martin, Nicolas F" sort="Martin, Nicolas F" uniqKey="Martin N" first="Nicolas F." last="Martin">Nicolas F. Martin</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Strasbourg, 11 rue de l'Université, F‐67000 Strasbourg</wicri:regionArea><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Bellazzini, Michele" sort="Bellazzini, Michele" uniqKey="Bellazzini M" first="Michele" last="Bellazzini">Michele Bellazzini</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>INAF – Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna</wicri:regionArea><wicri:noRegion>40127 Bologna</wicri:noRegion></affiliation></author><author><name sortKey="Sharp, Robert" sort="Sharp, Robert" uniqKey="Sharp R" first="Robert" last="Sharp">Robert Sharp</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo‐Australian Observatory, Epping, NSW 1710</wicri:regionArea><wicri:noRegion>NSW 1710</wicri:noRegion></affiliation></author><author><name sortKey="Tuntsov, Artem V" sort="Tuntsov, Artem V" uniqKey="Tuntsov A" first="Artem V." last="Tuntsov">Artem V. Tuntsov</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Ferguson, Annette M N" sort="Ferguson, Annette M N" uniqKey="Ferguson A" first="Annette M. N." last="Ferguson">Annette M. N. Ferguson</name><affiliation wicri:level="4"><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></analytic><monogr></monogr><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><biblScope unit="vol">376</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="939">939</biblScope><biblScope unit="page" to="959">959</biblScope><biblScope unit="page-count">21</biblScope><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2007-04-11">2007-04-11</date></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>2mass</term><term>2mass catalogue</term><term>Ared disc</term><term>Bellazzini</term><term>Besan</term><term>Carraro</term><term>Cent completeness</term><term>Cent completeness level</term><term>Centre</term><term>Clump stars</term><term>Cmds</term><term>Colour</term><term>Completeness</term><term>Completeness estimate</term><term>Conn</term><term>Corresponding besan</term><term>Data quality</term><term>Detection</term><term>Disc</term><term>Distance estimate</term><term>Distance estimates</term><term>Distant spiral</term><term>Dominant sequence</term><term>Ducial</term><term>Ducial sequence</term><term>Ducial sequences</term><term>Ducials</term><term>Dust extinction</term><term>Dwarf</term><term>Dwarf galaxies</term><term>Dwarf galaxy</term><term>Eld</term><term>Empty symbols</term><term>Fainter</term><term>Fainter magnitudes</term><term>Fainter sequence</term><term>February</term><term>Galactic</term><term>Galactic centre</term><term>Galactic components</term><term>Galactic disc</term><term>Galactic longitude</term><term>Galactic plane</term><term>Galactic warp</term><term>Galaxy</term><term>Grillmair</term><term>Gure</term><term>Halo</term><term>Heliocentric</term><term>Heliocentric distance</term><term>Hess</term><term>Hess plot</term><term>Hess plots</term><term>Ibata</term><term>Irwin</term><term>January</term><term>Journal compilation</term><term>Lled symbols</term><term>Longitude</term><term>Lower panel</term><term>Main sequence</term><term>Main sequences</term><term>Mnras</term><term>Momany</term><term>Monoceros ring</term><term>More stars</term><term>Newberg</term><term>Number density</term><term>Outer disc</term><term>Outer spiral</term><term>Overdensity</term><term>Pointings</term><term>Present paper</term><term>Present survey</term><term>Ratio estimate</term><term>Robin</term><term>Scenario</term><term>Sdss</term><term>Spiral arms</term><term>Square root</term><term>Star</term><term>Star symbols</term><term>Stellar</term><term>Stellar densities</term><term>Stellar density</term><term>Stellar populations</term><term>Strong sequence</term><term>Synthetic galaxy model</term><term>Tanvir</term><term>Thick disc</term><term>Thin disc</term><term>Tidal</term><term>Tted</term><term>Vega system</term><term>Vertical lines</term><term>Warp</term><term>Yusifov</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>2mass</term><term>2mass catalogue</term><term>Ared disc</term><term>Bellazzini</term><term>Besan</term><term>Carraro</term><term>Cent completeness</term><term>Cent completeness level</term><term>Centre</term><term>Clump stars</term><term>Cmds</term><term>Colour</term><term>Completeness</term><term>Completeness estimate</term><term>Conn</term><term>Corresponding besan</term><term>Data quality</term><term>Detection</term><term>Disc</term><term>Distance estimate</term><term>Distance estimates</term><term>Distant spiral</term><term>Dominant sequence</term><term>Ducial</term><term>Ducial sequence</term><term>Ducial sequences</term><term>Ducials</term><term>Dust extinction</term><term>Dwarf</term><term>Dwarf galaxies</term><term>Dwarf galaxy</term><term>Eld</term><term>Empty symbols</term><term>Fainter</term><term>Fainter magnitudes</term><term>Fainter sequence</term><term>February</term><term>Galactic</term><term>Galactic centre</term><term>Galactic components</term><term>Galactic disc</term><term>Galactic longitude</term><term>Galactic plane</term><term>Galactic warp</term><term>Galaxy</term><term>Grillmair</term><term>Gure</term><term>Halo</term><term>Heliocentric</term><term>Heliocentric distance</term><term>Hess</term><term>Hess plot</term><term>Hess plots</term><term>Ibata</term><term>Irwin</term><term>January</term><term>Journal compilation</term><term>Lled symbols</term><term>Longitude</term><term>Lower panel</term><term>Main sequence</term><term>Main sequences</term><term>Mnras</term><term>Momany</term><term>Monoceros ring</term><term>More stars</term><term>Newberg</term><term>Number density</term><term>Outer disc</term><term>Outer spiral</term><term>Overdensity</term><term>Pointings</term><term>Present paper</term><term>Present survey</term><term>Ratio estimate</term><term>Robin</term><term>Scenario</term><term>Sdss</term><term>Spiral arms</term><term>Square root</term><term>Star</term><term>Star symbols</term><term>Stellar</term><term>Stellar densities</term><term>Stellar density</term><term>Stellar populations</term><term>Strong sequence</term><term>Synthetic galaxy model</term><term>Tanvir</term><term>Thick disc</term><term>Thin disc</term><term>Tidal</term><term>Tted</term><term>Vega system</term><term>Vertical lines</term><term>Warp</term><term>Yusifov</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present the results of an Anglo‐Australian Telescope (AAT) wide field camera survey of the stars in the Monoceros Ring (MRi) and purported Canis Major (CMa) overdensity in the Galactic longitudes of l= (193–276)°. Current numerical simulations suggest that both of these structures are the result of a single on‐going accretion event, although an alternative solution is that the warped and flared disc of the Galaxy can explain the origin of both of these structures. Our results show that, with regards the MRi, the warped and flared disc is unable to reproduce the locations and strengths of the detections observed around the Galaxy. This supports a non‐Galactic origin for this structure. We report eight new detections and two tentative detections of the MRi in this survey. The exact nature of the CMa overdensity is still unresolved, although this survey provides evidence that invoking the Galactic warp is not a sufficient solution when compared with observation. Several fields in this survey are highly inconsistent with the current Galactic disc models that include a warp and flare, to such an extent that explaining their origins with these structures is problematic. We also report that the blue plume stars previously invoked to support the dwarf galaxy hypothesis are unfounded, and associating them with an outer spiral arm is equally problematic. Standard Galactic models are unable to accommodate all the observations of these new structures, leading away from a warped/flared disc explanation for their origins and more toward a non‐Galactic source. Additionally, evidence is presented in favour of a detection of the CMa dwarf stream away from the CMa region. As the outer reaches of the Galactic disc continue to be probed, the fascinating structures that are the MRi and CMa overdensity will no doubt continue to inform us of the unique structure and formation of the Milky Way.</div></front></TEI></ISTEX><ISTEX><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From l= (193–276)°</title><author><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name></author><author><name sortKey="Lane, Richard R" sort="Lane, Richard R" uniqKey="Lane R" first="Richard R." last="Lane">Richard R. Lane</name></author><author><name sortKey="Lewis, Geraint F" sort="Lewis, Geraint F" uniqKey="Lewis G" first="Geraint F." last="Lewis">Geraint F. Lewis</name></author><author><name sortKey="Gil Merino, Rodrigo" sort="Gil Merino, Rodrigo" uniqKey="Gil Merino R" first="Rodrigo" last="Gil-Merino">Rodrigo Gil-Merino</name></author><author><name sortKey="Irwin, Mike J" sort="Irwin, Mike J" uniqKey="Irwin M" first="Mike J." last="Irwin">Mike J. Irwin</name></author><author><name sortKey="Ibata, Rodrigo A" sort="Ibata, Rodrigo A" uniqKey="Ibata R" first="Rodrigo A." last="Ibata">Rodrigo A. Ibata</name></author><author><name sortKey="Martin, Nicolas F" sort="Martin, Nicolas F" uniqKey="Martin N" first="Nicolas F." last="Martin">Nicolas F. Martin</name></author><author><name sortKey="Bellazzini, Michele" sort="Bellazzini, Michele" uniqKey="Bellazzini M" first="Michele" last="Bellazzini">Michele Bellazzini</name></author><author><name sortKey="Sharp, Robert" sort="Sharp, Robert" uniqKey="Sharp R" first="Robert" last="Sharp">Robert Sharp</name></author><author><name sortKey="Tuntsov, Artem V" sort="Tuntsov, Artem V" uniqKey="Tuntsov A" first="Artem V." last="Tuntsov">Artem V. Tuntsov</name></author><author><name sortKey="Ferguson, Annette M N" sort="Ferguson, Annette M N" uniqKey="Ferguson A" first="Annette M. N." last="Ferguson">Annette M. N. Ferguson</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:35E3F1AA1B3C2E41144A75C137C4FB533036C0DB</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1111/j.1365-2966.2007.11503.x</idno><idno type="url">https://api.istex.fr/document/35E3F1AA1B3C2E41144A75C137C4FB533036C0DB/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000998</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000998</idno><idno type="wicri:Area/Istex/Curation">000998</idno><idno type="wicri:Area/Istex/Checkpoint">001285</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">001285</idno><idno type="wicri:doubleKey">0035-8711:2007:Conn B:the:aat:wfi</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From l= (193–276)°</title><author><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Chili</country><wicri:regionArea>European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago</wicri:regionArea><wicri:noRegion>Santiago</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Australie</country></affiliation><affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Lane, Richard R" sort="Lane, Richard R" uniqKey="Lane R" first="Richard R." last="Lane">Richard R. Lane</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Lewis, Geraint F" sort="Lewis, Geraint F" uniqKey="Lewis G" first="Geraint F." last="Lewis">Geraint F. Lewis</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Gil Merino, Rodrigo" sort="Gil Merino, Rodrigo" uniqKey="Gil Merino R" first="Rodrigo" last="Gil-Merino">Rodrigo Gil-Merino</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Irwin, Mike J" sort="Irwin, Mike J" uniqKey="Irwin M" first="Mike J." last="Irwin">Mike J. Irwin</name><affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Ibata, Rodrigo A" sort="Ibata, Rodrigo A" uniqKey="Ibata R" first="Rodrigo A." last="Ibata">Rodrigo A. Ibata</name><affiliation wicri:level="1"><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg</wicri:regionArea><wicri:noRegion>67000 Strasbourg</wicri:noRegion><wicri:noRegion>F-67000 Strasbourg</wicri:noRegion></affiliation></author><author><name sortKey="Martin, Nicolas F" sort="Martin, Nicolas F" uniqKey="Martin N" first="Nicolas F." last="Martin">Nicolas F. Martin</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg</wicri:regionArea><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Bellazzini, Michele" sort="Bellazzini, Michele" uniqKey="Bellazzini M" first="Michele" last="Bellazzini">Michele Bellazzini</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>INAF – Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna</wicri:regionArea><wicri:noRegion>40127 Bologna</wicri:noRegion></affiliation></author><author><name sortKey="Sharp, Robert" sort="Sharp, Robert" uniqKey="Sharp R" first="Robert" last="Sharp">Robert Sharp</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, Epping, NSW 1710</wicri:regionArea><wicri:noRegion>NSW 1710</wicri:noRegion></affiliation></author><author><name sortKey="Tuntsov, Artem V" sort="Tuntsov, Artem V" uniqKey="Tuntsov A" first="Artem V." last="Tuntsov">Artem V. Tuntsov</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Astronomy, School of Physics, A29 University of Sydney, NSW 2006</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Ferguson, Annette M N" sort="Ferguson, Annette M N" uniqKey="Ferguson A" first="Annette M. N." last="Ferguson">Annette M. N. Ferguson</name><affiliation wicri:level="4"><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></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="2007-04-11">2007-04-11</date><biblScope unit="volume">376</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="939">939</biblScope><biblScope unit="page" to="959">959</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 present the results of an Anglo-Australian Telescope (AAT) wide field camera survey of the stars in the Monoceros Ring (MRi) and purported Canis Major (CMa) overdensity in the Galactic longitudes of l= (193–276)°. Current numerical simulations suggest that both of these structures are the result of a single on-going accretion event, although an alternative solution is that the warped and flared disc of the Galaxy can explain the origin of both of these structures. Our results show that, with regards the MRi, the warped and flared disc is unable to reproduce the locations and strengths of the detections observed around the Galaxy. This supports a non-Galactic origin for this structure. We report eight new detections and two tentative detections of the MRi in this survey. The exact nature of the CMa overdensity is still unresolved, although this survey provides evidence that invoking the Galactic warp is not a sufficient solution when compared with observation. Several fields in this survey are highly inconsistent with the current Galactic disc models that include a warp and flare, to such an extent that explaining their origins with these structures is problematic. We also report that the blue plume stars previously invoked to support the dwarf galaxy hypothesis are unfounded, and associating them with an outer spiral arm is equally problematic. Standard Galactic models are unable to accommodate all the observations of these new structures, leading away from a warped/flared disc explanation for their origins and more toward a non-Galactic source. Additionally, evidence is presented in favour of a detection of the CMa dwarf stream away from the CMa region. As the outer reaches of the Galactic disc continue to be probed, the fascinating structures that are the MRi and CMa overdensity will no doubt continue to inform us of the unique structure and formation of the Milky Way.</div></front></TEI></ISTEX></double></record>Pour manipuler ce document sous Unix (Dilib)
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