The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample

Ramos, P. - Antoja, T. - Mateu, Cecilia - Anders, F. - Laporte, C. F. P. - Carballo-Bello, J. A. - Famaey, B. - Ibata, R.

Resumen:

Context. The Gaia astrometric sample allows us to study the outermost Galactic disc, the halo, and their interface. It is precisely at the very edge of the disc where the effects of external perturbations are expected to be the most noticeable. Aims. Our goal is to detect the kinematic substructure present in the halo and at the edge of the Milky Way (MW) disc and provide observational constraints on their phase-space distribution. Methods. We download, one HEALpix at a time, the proper motion histogram of distant stars, to which we apply a wavelet transformation to reveal the significant overdensities. We then analyse the large coherent structures that appear in the sky. Results. We reveal a sharp yet complex anticentre dominated by Monoceros (MNC) and the Anticentre Stream (ACS) in the north – which we find have intensities comparable to the Magellanic Clouds and the Sagittarius stream – and by MNC South and TriAnd at negative latitudes. Our method allows us to perform a morphological analysis of MNC and the ACS, both of which span more than 100° in longitude, and to provide a high purity sample of giants with which we track MNC down to latitudes as low as ∼5°. Their colour-magnitude diagram is consistent with extended structures at a distance of ∼10−11 kpc that originated in the disc, with a very low ratio of RR Lyrae over M giants, and with kinematics compatible with the rotation curve at those distances or slightly slower. Conclusions. We present a precise characterisation of MNC and the ACS, two previously known structures that our method reveals naturally, allowing us to detect them without limiting ourselves to a particular stellar type and, for the first time, using only kinematics. Our results will allow future studies to model their chemo-dynamics and evolution, thus constraining some of the most influential processes that shaped the MW.


Detalles Bibliográficos
2021
Galaxy: kinematics and dynamics
Galaxy: formation
Galaxy: halo – astrometry
Inglés
Universidad de la República
COLIBRI
https://hdl.handle.net/20.500.12008/34079
Acceso abierto
Licencia Creative Commons Atribución (CC - By 4.0)
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author Ramos, P.
author2 Antoja, T.
Mateu, Cecilia
Anders, F.
Laporte, C. F. P.
Carballo-Bello, J. A.
Famaey, B.
Ibata, R.
author2_role author
author
author
author
author
author
author
author_facet Ramos, P.
Antoja, T.
Mateu, Cecilia
Anders, F.
Laporte, C. F. P.
Carballo-Bello, J. A.
Famaey, B.
Ibata, R.
author_role author
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collection COLIBRI
dc.contributor.filiacion.none.fl_str_mv Ramos P.
Antoja T.
Mateu Cecilia, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física.
Anders F.
Laporte C. F. P.
Carballo-Bello J. A.
Famaey B.
Ibata R.
dc.creator.none.fl_str_mv Ramos, P.
Antoja, T.
Mateu, Cecilia
Anders, F.
Laporte, C. F. P.
Carballo-Bello, J. A.
Famaey, B.
Ibata, R.
dc.date.accessioned.none.fl_str_mv 2022-10-11T13:04:53Z
dc.date.available.none.fl_str_mv 2022-10-11T13:04:53Z
dc.date.issued.none.fl_str_mv 2021
dc.description.abstract.none.fl_txt_mv Context. The Gaia astrometric sample allows us to study the outermost Galactic disc, the halo, and their interface. It is precisely at the very edge of the disc where the effects of external perturbations are expected to be the most noticeable. Aims. Our goal is to detect the kinematic substructure present in the halo and at the edge of the Milky Way (MW) disc and provide observational constraints on their phase-space distribution. Methods. We download, one HEALpix at a time, the proper motion histogram of distant stars, to which we apply a wavelet transformation to reveal the significant overdensities. We then analyse the large coherent structures that appear in the sky. Results. We reveal a sharp yet complex anticentre dominated by Monoceros (MNC) and the Anticentre Stream (ACS) in the north – which we find have intensities comparable to the Magellanic Clouds and the Sagittarius stream – and by MNC South and TriAnd at negative latitudes. Our method allows us to perform a morphological analysis of MNC and the ACS, both of which span more than 100° in longitude, and to provide a high purity sample of giants with which we track MNC down to latitudes as low as ∼5°. Their colour-magnitude diagram is consistent with extended structures at a distance of ∼10−11 kpc that originated in the disc, with a very low ratio of RR Lyrae over M giants, and with kinematics compatible with the rotation curve at those distances or slightly slower. Conclusions. We present a precise characterisation of MNC and the ACS, two previously known structures that our method reveals naturally, allowing us to detect them without limiting ourselves to a particular stellar type and, for the first time, using only kinematics. Our results will allow future studies to model their chemo-dynamics and evolution, thus constraining some of the most influential processes that shaped the MW.
dc.format.extent.es.fl_str_mv 17 h
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dc.identifier.citation.es.fl_str_mv Ramos, P, Antoja, T, Mateu, C [y otros autores]. "The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample". Astronomy & Astrophysics. [en línea] 2021, 646: A99. 17 h. DOI: 10.1051/0004-6361/202039830.
dc.identifier.doi.none.fl_str_mv 10.1051/0004-6361/202039830
dc.identifier.issn.none.fl_str_mv 1432-0746
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/20.500.12008/34079
dc.language.iso.none.fl_str_mv en
eng
dc.publisher.es.fl_str_mv EDP Sciences
dc.relation.ispartof.es.fl_str_mv Astronomy & Astrophysics, 2021, 646: A99
dc.rights.license.none.fl_str_mv Licencia Creative Commons Atribución (CC - By 4.0)
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
dc.source.none.fl_str_mv reponame:COLIBRI
instname:Universidad de la República
instacron:Universidad de la República
dc.subject.es.fl_str_mv Galaxy: kinematics and dynamics
Galaxy: formation
Galaxy: halo – astrometry
dc.title.none.fl_str_mv The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
dc.type.es.fl_str_mv Artículo
dc.type.none.fl_str_mv info:eu-repo/semantics/article
dc.type.version.none.fl_str_mv info:eu-repo/semantics/publishedVersion
description Context. The Gaia astrometric sample allows us to study the outermost Galactic disc, the halo, and their interface. It is precisely at the very edge of the disc where the effects of external perturbations are expected to be the most noticeable. Aims. Our goal is to detect the kinematic substructure present in the halo and at the edge of the Milky Way (MW) disc and provide observational constraints on their phase-space distribution. Methods. We download, one HEALpix at a time, the proper motion histogram of distant stars, to which we apply a wavelet transformation to reveal the significant overdensities. We then analyse the large coherent structures that appear in the sky. Results. We reveal a sharp yet complex anticentre dominated by Monoceros (MNC) and the Anticentre Stream (ACS) in the north – which we find have intensities comparable to the Magellanic Clouds and the Sagittarius stream – and by MNC South and TriAnd at negative latitudes. Our method allows us to perform a morphological analysis of MNC and the ACS, both of which span more than 100° in longitude, and to provide a high purity sample of giants with which we track MNC down to latitudes as low as ∼5°. Their colour-magnitude diagram is consistent with extended structures at a distance of ∼10−11 kpc that originated in the disc, with a very low ratio of RR Lyrae over M giants, and with kinematics compatible with the rotation curve at those distances or slightly slower. Conclusions. We present a precise characterisation of MNC and the ACS, two previously known structures that our method reveals naturally, allowing us to detect them without limiting ourselves to a particular stellar type and, for the first time, using only kinematics. Our results will allow future studies to model their chemo-dynamics and evolution, thus constraining some of the most influential processes that shaped the MW.
eu_rights_str_mv openAccess
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identifier_str_mv Ramos, P, Antoja, T, Mateu, C [y otros autores]. "The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample". Astronomy & Astrophysics. [en línea] 2021, 646: A99. 17 h. DOI: 10.1051/0004-6361/202039830.
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10.1051/0004-6361/202039830
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publishDate 2021
reponame_str COLIBRI
repository.mail.fl_str_mv mabel.seroubian@seciu.edu.uy
repository.name.fl_str_mv COLIBRI - Universidad de la República
repository_id_str 4771
rights_invalid_str_mv Licencia Creative Commons Atribución (CC - By 4.0)
spelling Ramos P.Antoja T.Mateu Cecilia, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física.Anders F.Laporte C. F. P.Carballo-Bello J. A.Famaey B.Ibata R.2022-10-11T13:04:53Z2022-10-11T13:04:53Z2021Ramos, P, Antoja, T, Mateu, C [y otros autores]. "The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample". Astronomy & Astrophysics. [en línea] 2021, 646: A99. 17 h. DOI: 10.1051/0004-6361/202039830.1432-0746https://hdl.handle.net/20.500.12008/3407910.1051/0004-6361/202039830Context. The Gaia astrometric sample allows us to study the outermost Galactic disc, the halo, and their interface. It is precisely at the very edge of the disc where the effects of external perturbations are expected to be the most noticeable. Aims. Our goal is to detect the kinematic substructure present in the halo and at the edge of the Milky Way (MW) disc and provide observational constraints on their phase-space distribution. Methods. We download, one HEALpix at a time, the proper motion histogram of distant stars, to which we apply a wavelet transformation to reveal the significant overdensities. We then analyse the large coherent structures that appear in the sky. Results. We reveal a sharp yet complex anticentre dominated by Monoceros (MNC) and the Anticentre Stream (ACS) in the north – which we find have intensities comparable to the Magellanic Clouds and the Sagittarius stream – and by MNC South and TriAnd at negative latitudes. Our method allows us to perform a morphological analysis of MNC and the ACS, both of which span more than 100° in longitude, and to provide a high purity sample of giants with which we track MNC down to latitudes as low as ∼5°. Their colour-magnitude diagram is consistent with extended structures at a distance of ∼10−11 kpc that originated in the disc, with a very low ratio of RR Lyrae over M giants, and with kinematics compatible with the rotation curve at those distances or slightly slower. Conclusions. We present a precise characterisation of MNC and the ACS, two previously known structures that our method reveals naturally, allowing us to detect them without limiting ourselves to a particular stellar type and, for the first time, using only kinematics. Our results will allow future studies to model their chemo-dynamics and evolution, thus constraining some of the most influential processes that shaped the MW.Submitted by Parodi Mónica (mparodi@fcien.edu.uy) on 2022-09-28T14:58:03Z No. of bitstreams: 2 license_rdf: 19875 bytes, checksum: 9fdbed07f52437945402c4e70fa4773e (MD5) 10105100046361202039830.pdf: 14297182 bytes, checksum: c6c512634c9936e67be02e71ad5d7309 (MD5)Approved for entry into archive by Faget Cecilia (lfaget@fcien.edu.uy) on 2022-10-11T12:58:01Z (GMT) No. of bitstreams: 2 license_rdf: 19875 bytes, checksum: 9fdbed07f52437945402c4e70fa4773e (MD5) 10105100046361202039830.pdf: 14297182 bytes, checksum: c6c512634c9936e67be02e71ad5d7309 (MD5)Made available in DSpace by Luna Fabiana (fabiana.luna@seciu.edu.uy) on 2022-10-11T13:04:53Z (GMT). No. of bitstreams: 2 license_rdf: 19875 bytes, checksum: 9fdbed07f52437945402c4e70fa4773e (MD5) 10105100046361202039830.pdf: 14297182 bytes, checksum: c6c512634c9936e67be02e71ad5d7309 (MD5) Previous issue date: 202117 happlication/pdfenengEDP SciencesAstronomy & Astrophysics, 2021, 646: A99Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución (CC - By 4.0)Galaxy: kinematics and dynamicsGalaxy: formationGalaxy: halo – astrometryThe outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sampleArtículoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionreponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaRamos, P.Antoja, T.Mateu, CeciliaAnders, F.Laporte, C. F. P.Carballo-Bello, J. 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- Universidad de la Repúblicafalse
spellingShingle The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
Ramos, P.
Galaxy: kinematics and dynamics
Galaxy: formation
Galaxy: halo – astrometry
status_str publishedVersion
title The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
title_full The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
title_fullStr The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
title_full_unstemmed The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
title_short The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
title_sort The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
topic Galaxy: kinematics and dynamics
Galaxy: formation
Galaxy: halo – astrometry
url https://hdl.handle.net/20.500.12008/34079