The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample
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.
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 |
dc.format.mimetype.es.fl_str_mv | application/pdf |
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 |
format | article |
id | COLIBRI_2ac1e49daa5e6be9106a65f976135a50 |
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. 1432-0746 10.1051/0004-6361/202039830 |
instacron_str | Universidad de la República |
institution | Universidad de la República |
instname_str | Universidad de la República |
language | eng |
language_invalid_str_mv | en |
network_acronym_str | COLIBRI |
network_name_str | COLIBRI |
oai_identifier_str | oai:colibri.udelar.edu.uy:20.500.12008/34079 |
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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Universidadhttps://udelar.edu.uy/https://www.colibri.udelar.edu.uy/oai/requestmabel.seroubian@seciu.edu.uyUruguayopendoar:47712024-07-25T14:28:49.054535COLIBRI - 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 |