The AAT/WFI survey of the Monoceros Ring and Canis Major dwarf galaxy – I. From l= (193–276)°
Identifieur interne : 009086 ( Main/Exploration ); précédent : 009085; suivant : 009087The 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.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- 2mass, 2mass catalogue, Accretion, Ared disc, Bellazzini, Besan, Carraro, Cent completeness, Cent completeness level, Centre, Clump stars, Cmds, Colour, Completeness, Completeness estimate, Conn, Corresponding besan, Data quality, Detection, Digital simulation, Disc, Disk galaxies, 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 disks, Galactic longitude, Galactic plane, Galactic warp, Galaxy, Galaxy formation, Galaxy structure, 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, Milky Way, 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 arm, Spiral arms, Square root, Standard model, 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
Affiliations:
- Australie, Chili, France, Italie, Royaume-Uni
- Alsace (région administrative), Grand Est, Nouvelle-Galles du Sud, Écosse
- Strasbourg, Sydney, Édimbourg
- Université d'Édimbourg, Université de Sydney
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Le document en format XML
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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><affiliations><list><country><li>Australie</li><li>Chili</li><li>France</li><li>Italie</li><li>Royaume-Uni</li></country><region><li>Alsace (région administrative)</li><li>Grand Est</li><li>Nouvelle-Galles du Sud</li><li>Écosse</li></region><settlement><li>Strasbourg</li><li>Sydney</li><li>Édimbourg</li></settlement><orgName><li>Université d'Édimbourg</li><li>Université de Sydney</li></orgName></list><tree><noCountry><name sortKey="Irwin, Mike J" sort="Irwin, Mike J" uniqKey="Irwin M" first="Mike J." last="Irwin">Mike J. Irwin</name></noCountry><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name></region><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name><name sortKey="Gil Erino, Rodrigo" sort="Gil Erino, Rodrigo" uniqKey="Gil Erino R" first="Rodrigo" last="Gil-Merino">Rodrigo Gil-Merino</name><name sortKey="Lane, Richard R" sort="Lane, Richard R" uniqKey="Lane R" first="Richard R." last="Lane">Richard R. Lane</name><name sortKey="Lewis, Geraint F" sort="Lewis, Geraint F" uniqKey="Lewis G" first="Geraint F." last="Lewis">Geraint F. Lewis</name><name sortKey="Sharp, Robert" sort="Sharp, Robert" uniqKey="Sharp R" first="Robert" last="Sharp">Robert Sharp</name><name sortKey="Tuntsov, Artem V" sort="Tuntsov, Artem V" uniqKey="Tuntsov A" first="Artem V." last="Tuntsov">Artem V. Tuntsov</name></country><country name="Chili"><noRegion><name sortKey="Conn, Blair C" sort="Conn, Blair C" uniqKey="Conn B" first="Blair C." last="Conn">Blair C. Conn</name></noRegion></country><country name="France"><noRegion><name sortKey="Ibata, Rodrigo A" sort="Ibata, Rodrigo A" uniqKey="Ibata R" first="Rodrigo A." last="Ibata">Rodrigo A. Ibata</name></noRegion><name sortKey="Martin, Nicolas F" sort="Martin, Nicolas F" uniqKey="Martin N" first="Nicolas F." last="Martin">Nicolas F. Martin</name></country><country name="Italie"><noRegion><name sortKey="Bellazzini, Michele" sort="Bellazzini, Michele" uniqKey="Bellazzini M" first="Michele" last="Bellazzini">Michele Bellazzini</name></noRegion></country><country name="Royaume-Uni"><region name="Écosse"><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></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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