Gaia Data Release 2: Mapping the Milky Way disc kinematics
Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential...
Gespeichert in:
| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2018-08 |
|---|---|
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | |
|---|---|
| container_issue | |
| container_start_page | |
| container_title | Astronomy and astrophysics (Berlin) |
| container_volume | |
| creator | Romero Gómez, Mercè Figueras Siñol, Francesca Jordi i Nebot, Carme Luri Carrascoso, Xavier Fabricius, Claus Masana Fresno, Eduard Portell i de Mora, Jordi Clotet Altarriba, Marcial Torra Roca, Jorge Antiche Garzón, Erika Balaguer Núñez, María de los Dolores Borrachero, R Cantat Gaudin, T Carrasco Martínez, José Manuel Casamiquela Floriach, Laia Castro Ginard, A Farràs Casas, M Julbe, F Mor Crespo, Roger Torra Clotet, Ferran Voss, Hölger Antoja Castelltort, M. Teresa Gaia Collaboration |
| description | Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential of Gaia DR2, we provide a first look at the kinematics of the Milky Way disc, within a radius of several kiloparsecs around the Sun. Methods. We benefit for the first time from a sample of 6.4 million F-G-K stars with full 6D phase-space coordinates, precise parallaxes and precise Galactic cylindrical velocities. From this sample, we extracted a sub-sample of 3.2 million giant stars to map the velocity field of the Galactic disc from ∼5 kpc to ∼13 kpc from the Galactic centre and up to 2 kpc above and below the plane. We also study the distribution of 0.3 millionsolar neighbourhood stars (r |
| format | Article |
| fullrecord | <record><control><sourceid>csuc</sourceid><recordid>TN_cdi_csuc_recercat_oai_recercat_cat_2072_353878</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>oai_recercat_cat_2072_353878</sourcerecordid><originalsourceid>FETCH-csuc_recercat_oai_recercat_cat_2072_3538783</originalsourceid><addsrcrecordid>eNqdi7sKwkAQAK9QMD7-YX8gcA9NQlqfTRoRLMNyrromxpA9i_y9CoK9xTBMMQMVaa3nceISM1Jjkds7rclcpPItMsIKA8KeakIhsDkU2LbcXCBcCQquqx6O2MOJxUPFDd0xsJepGp6xFpp9PVFmsz4sd7GXpy878tR5DOUD-RcfrE5t6RYuSzP3z_MCNWA_Tw</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Gaia Data Release 2: Mapping the Milky Way disc kinematics</title><source>Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX</source><source>EDP Sciences</source><source>Recercat</source><source>EZB-FREE-00999 freely available EZB journals</source><creator>Romero Gómez, Mercè ; Figueras Siñol, Francesca ; Jordi i Nebot, Carme ; Luri Carrascoso, Xavier ; Fabricius, Claus ; Masana Fresno, Eduard ; Portell i de Mora, Jordi ; Clotet Altarriba, Marcial ; Torra Roca, Jorge ; Antiche Garzón, Erika ; Balaguer Núñez, María de los Dolores ; Borrachero, R ; Cantat Gaudin, T ; Carrasco Martínez, José Manuel ; Casamiquela Floriach, Laia ; Castro Ginard, A ; Farràs Casas, M ; Julbe, F ; Mor Crespo, Roger ; Torra Clotet, Ferran ; Voss, Hölger ; Antoja Castelltort, M. Teresa ; Gaia Collaboration</creator><creatorcontrib>Romero Gómez, Mercè ; Figueras Siñol, Francesca ; Jordi i Nebot, Carme ; Luri Carrascoso, Xavier ; Fabricius, Claus ; Masana Fresno, Eduard ; Portell i de Mora, Jordi ; Clotet Altarriba, Marcial ; Torra Roca, Jorge ; Antiche Garzón, Erika ; Balaguer Núñez, María de los Dolores ; Borrachero, R ; Cantat Gaudin, T ; Carrasco Martínez, José Manuel ; Casamiquela Floriach, Laia ; Castro Ginard, A ; Farràs Casas, M ; Julbe, F ; Mor Crespo, Roger ; Torra Clotet, Ferran ; Voss, Hölger ; Antoja Castelltort, M. Teresa ; Gaia Collaboration</creatorcontrib><description>Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential of Gaia DR2, we provide a first look at the kinematics of the Milky Way disc, within a radius of several kiloparsecs around the Sun. Methods. We benefit for the first time from a sample of 6.4 million F-G-K stars with full 6D phase-space coordinates, precise parallaxes and precise Galactic cylindrical velocities. From this sample, we extracted a sub-sample of 3.2 million giant stars to map the velocity field of the Galactic disc from ∼5 kpc to ∼13 kpc from the Galactic centre and up to 2 kpc above and below the plane. We also study the distribution of 0.3 millionsolar neighbourhood stars (r<200 pc), with median velocity uncertainties of 0.4 km s−1, in velocity space and use the full sample to examine how the over-densities evolve in more distant regions. Results. Gaia DR2 allows us to draw 3D maps of the Galactocentric median velocities and velocity dispersions with unprecedented accuracy, precision, and spatial resolution. The maps show the complexity and richness of the velocity field of the galactic disc. We observe streaming motions in all the components of the velocities as well as patterns in the velocity dispersions. For example, we confirm the previously reported negative and positive galactocentric radial velocity gradients in the inner and outer disc, respectively. Here, we see them as part of a non-axisymmetric kinematic oscillation, and we map its azimuthal and vertical behaviour. We also witness a new global arrangement of stars in the velocity plane of the solar neighbourhood and in distant regions in which stars are organised in thin substructures with the shape of circular arches that are oriented approximately along the horizontal direction in the U−V plane. Moreover, in distant regions, we see variations in the velocity substructures more clearly than ever before, in particular, variations in the velocity of the Hercules stream. Conclusions. Gaia DR2 provides the largest existing full 6D phase-space coordinates catalogue. It also vastly increases the number of available distances and transverse velocities with respect to Gaia DR1. Gaia DR2 offers a great wealth of information on the Milky Way and reveals clear non-axisymmetric kinematic signatures within the Galactic disc, for instance. It is now up to the astronomical community to explore its full potential.</description><identifier>ISSN: 0004-6361</identifier><language>eng</language><publisher>EDP Sciences</publisher><subject>Discs (Astrofísica) ; Disks (Astrophysics) ; Galaxies ; Galàxies ; Milky Way ; Via Làctia</subject><ispartof>Astronomy and astrophysics (Berlin), 2018-08</ispartof><rights>(c) The European Southern Observatory (ESO), 2018 info:eu-repo/semantics/openAccess</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,26951</link.rule.ids></links><search><creatorcontrib>Romero Gómez, Mercè</creatorcontrib><creatorcontrib>Figueras Siñol, Francesca</creatorcontrib><creatorcontrib>Jordi i Nebot, Carme</creatorcontrib><creatorcontrib>Luri Carrascoso, Xavier</creatorcontrib><creatorcontrib>Fabricius, Claus</creatorcontrib><creatorcontrib>Masana Fresno, Eduard</creatorcontrib><creatorcontrib>Portell i de Mora, Jordi</creatorcontrib><creatorcontrib>Clotet Altarriba, Marcial</creatorcontrib><creatorcontrib>Torra Roca, Jorge</creatorcontrib><creatorcontrib>Antiche Garzón, Erika</creatorcontrib><creatorcontrib>Balaguer Núñez, María de los Dolores</creatorcontrib><creatorcontrib>Borrachero, R</creatorcontrib><creatorcontrib>Cantat Gaudin, T</creatorcontrib><creatorcontrib>Carrasco Martínez, José Manuel</creatorcontrib><creatorcontrib>Casamiquela Floriach, Laia</creatorcontrib><creatorcontrib>Castro Ginard, A</creatorcontrib><creatorcontrib>Farràs Casas, M</creatorcontrib><creatorcontrib>Julbe, F</creatorcontrib><creatorcontrib>Mor Crespo, Roger</creatorcontrib><creatorcontrib>Torra Clotet, Ferran</creatorcontrib><creatorcontrib>Voss, Hölger</creatorcontrib><creatorcontrib>Antoja Castelltort, M. Teresa</creatorcontrib><creatorcontrib>Gaia Collaboration</creatorcontrib><title>Gaia Data Release 2: Mapping the Milky Way disc kinematics</title><title>Astronomy and astrophysics (Berlin)</title><description>Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential of Gaia DR2, we provide a first look at the kinematics of the Milky Way disc, within a radius of several kiloparsecs around the Sun. Methods. We benefit for the first time from a sample of 6.4 million F-G-K stars with full 6D phase-space coordinates, precise parallaxes and precise Galactic cylindrical velocities. From this sample, we extracted a sub-sample of 3.2 million giant stars to map the velocity field of the Galactic disc from ∼5 kpc to ∼13 kpc from the Galactic centre and up to 2 kpc above and below the plane. We also study the distribution of 0.3 millionsolar neighbourhood stars (r<200 pc), with median velocity uncertainties of 0.4 km s−1, in velocity space and use the full sample to examine how the over-densities evolve in more distant regions. Results. Gaia DR2 allows us to draw 3D maps of the Galactocentric median velocities and velocity dispersions with unprecedented accuracy, precision, and spatial resolution. The maps show the complexity and richness of the velocity field of the galactic disc. We observe streaming motions in all the components of the velocities as well as patterns in the velocity dispersions. For example, we confirm the previously reported negative and positive galactocentric radial velocity gradients in the inner and outer disc, respectively. Here, we see them as part of a non-axisymmetric kinematic oscillation, and we map its azimuthal and vertical behaviour. We also witness a new global arrangement of stars in the velocity plane of the solar neighbourhood and in distant regions in which stars are organised in thin substructures with the shape of circular arches that are oriented approximately along the horizontal direction in the U−V plane. Moreover, in distant regions, we see variations in the velocity substructures more clearly than ever before, in particular, variations in the velocity of the Hercules stream. Conclusions. Gaia DR2 provides the largest existing full 6D phase-space coordinates catalogue. It also vastly increases the number of available distances and transverse velocities with respect to Gaia DR1. Gaia DR2 offers a great wealth of information on the Milky Way and reveals clear non-axisymmetric kinematic signatures within the Galactic disc, for instance. It is now up to the astronomical community to explore its full potential.</description><subject>Discs (Astrofísica)</subject><subject>Disks (Astrophysics)</subject><subject>Galaxies</subject><subject>Galàxies</subject><subject>Milky Way</subject><subject>Via Làctia</subject><issn>0004-6361</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>XX2</sourceid><recordid>eNqdi7sKwkAQAK9QMD7-YX8gcA9NQlqfTRoRLMNyrromxpA9i_y9CoK9xTBMMQMVaa3nceISM1Jjkds7rclcpPItMsIKA8KeakIhsDkU2LbcXCBcCQquqx6O2MOJxUPFDd0xsJepGp6xFpp9PVFmsz4sd7GXpy878tR5DOUD-RcfrE5t6RYuSzP3z_MCNWA_Tw</recordid><startdate>201808</startdate><enddate>201808</enddate><creator>Romero Gómez, Mercè</creator><creator>Figueras Siñol, Francesca</creator><creator>Jordi i Nebot, Carme</creator><creator>Luri Carrascoso, Xavier</creator><creator>Fabricius, Claus</creator><creator>Masana Fresno, Eduard</creator><creator>Portell i de Mora, Jordi</creator><creator>Clotet Altarriba, Marcial</creator><creator>Torra Roca, Jorge</creator><creator>Antiche Garzón, Erika</creator><creator>Balaguer Núñez, María de los Dolores</creator><creator>Borrachero, R</creator><creator>Cantat Gaudin, T</creator><creator>Carrasco Martínez, José Manuel</creator><creator>Casamiquela Floriach, Laia</creator><creator>Castro Ginard, A</creator><creator>Farràs Casas, M</creator><creator>Julbe, F</creator><creator>Mor Crespo, Roger</creator><creator>Torra Clotet, Ferran</creator><creator>Voss, Hölger</creator><creator>Antoja Castelltort, M. Teresa</creator><creator>Gaia Collaboration</creator><general>EDP Sciences</general><scope>XX2</scope></search><sort><creationdate>201808</creationdate><title>Gaia Data Release 2: Mapping the Milky Way disc kinematics</title><author>Romero Gómez, Mercè ; Figueras Siñol, Francesca ; Jordi i Nebot, Carme ; Luri Carrascoso, Xavier ; Fabricius, Claus ; Masana Fresno, Eduard ; Portell i de Mora, Jordi ; Clotet Altarriba, Marcial ; Torra Roca, Jorge ; Antiche Garzón, Erika ; Balaguer Núñez, María de los Dolores ; Borrachero, R ; Cantat Gaudin, T ; Carrasco Martínez, José Manuel ; Casamiquela Floriach, Laia ; Castro Ginard, A ; Farràs Casas, M ; Julbe, F ; Mor Crespo, Roger ; Torra Clotet, Ferran ; Voss, Hölger ; Antoja Castelltort, M. Teresa ; Gaia Collaboration</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-csuc_recercat_oai_recercat_cat_2072_3538783</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Discs (Astrofísica)</topic><topic>Disks (Astrophysics)</topic><topic>Galaxies</topic><topic>Galàxies</topic><topic>Milky Way</topic><topic>Via Làctia</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Romero Gómez, Mercè</creatorcontrib><creatorcontrib>Figueras Siñol, Francesca</creatorcontrib><creatorcontrib>Jordi i Nebot, Carme</creatorcontrib><creatorcontrib>Luri Carrascoso, Xavier</creatorcontrib><creatorcontrib>Fabricius, Claus</creatorcontrib><creatorcontrib>Masana Fresno, Eduard</creatorcontrib><creatorcontrib>Portell i de Mora, Jordi</creatorcontrib><creatorcontrib>Clotet Altarriba, Marcial</creatorcontrib><creatorcontrib>Torra Roca, Jorge</creatorcontrib><creatorcontrib>Antiche Garzón, Erika</creatorcontrib><creatorcontrib>Balaguer Núñez, María de los Dolores</creatorcontrib><creatorcontrib>Borrachero, R</creatorcontrib><creatorcontrib>Cantat Gaudin, T</creatorcontrib><creatorcontrib>Carrasco Martínez, José Manuel</creatorcontrib><creatorcontrib>Casamiquela Floriach, Laia</creatorcontrib><creatorcontrib>Castro Ginard, A</creatorcontrib><creatorcontrib>Farràs Casas, M</creatorcontrib><creatorcontrib>Julbe, F</creatorcontrib><creatorcontrib>Mor Crespo, Roger</creatorcontrib><creatorcontrib>Torra Clotet, Ferran</creatorcontrib><creatorcontrib>Voss, Hölger</creatorcontrib><creatorcontrib>Antoja Castelltort, M. Teresa</creatorcontrib><creatorcontrib>Gaia Collaboration</creatorcontrib><collection>Recercat</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Romero Gómez, Mercè</au><au>Figueras Siñol, Francesca</au><au>Jordi i Nebot, Carme</au><au>Luri Carrascoso, Xavier</au><au>Fabricius, Claus</au><au>Masana Fresno, Eduard</au><au>Portell i de Mora, Jordi</au><au>Clotet Altarriba, Marcial</au><au>Torra Roca, Jorge</au><au>Antiche Garzón, Erika</au><au>Balaguer Núñez, María de los Dolores</au><au>Borrachero, R</au><au>Cantat Gaudin, T</au><au>Carrasco Martínez, José Manuel</au><au>Casamiquela Floriach, Laia</au><au>Castro Ginard, A</au><au>Farràs Casas, M</au><au>Julbe, F</au><au>Mor Crespo, Roger</au><au>Torra Clotet, Ferran</au><au>Voss, Hölger</au><au>Antoja Castelltort, M. Teresa</au><au>Gaia Collaboration</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gaia Data Release 2: Mapping the Milky Way disc kinematics</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2018-08</date><risdate>2018</risdate><issn>0004-6361</issn><abstract>Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential of Gaia DR2, we provide a first look at the kinematics of the Milky Way disc, within a radius of several kiloparsecs around the Sun. Methods. We benefit for the first time from a sample of 6.4 million F-G-K stars with full 6D phase-space coordinates, precise parallaxes and precise Galactic cylindrical velocities. From this sample, we extracted a sub-sample of 3.2 million giant stars to map the velocity field of the Galactic disc from ∼5 kpc to ∼13 kpc from the Galactic centre and up to 2 kpc above and below the plane. We also study the distribution of 0.3 millionsolar neighbourhood stars (r<200 pc), with median velocity uncertainties of 0.4 km s−1, in velocity space and use the full sample to examine how the over-densities evolve in more distant regions. Results. Gaia DR2 allows us to draw 3D maps of the Galactocentric median velocities and velocity dispersions with unprecedented accuracy, precision, and spatial resolution. The maps show the complexity and richness of the velocity field of the galactic disc. We observe streaming motions in all the components of the velocities as well as patterns in the velocity dispersions. For example, we confirm the previously reported negative and positive galactocentric radial velocity gradients in the inner and outer disc, respectively. Here, we see them as part of a non-axisymmetric kinematic oscillation, and we map its azimuthal and vertical behaviour. We also witness a new global arrangement of stars in the velocity plane of the solar neighbourhood and in distant regions in which stars are organised in thin substructures with the shape of circular arches that are oriented approximately along the horizontal direction in the U−V plane. Moreover, in distant regions, we see variations in the velocity substructures more clearly than ever before, in particular, variations in the velocity of the Hercules stream. Conclusions. Gaia DR2 provides the largest existing full 6D phase-space coordinates catalogue. It also vastly increases the number of available distances and transverse velocities with respect to Gaia DR1. Gaia DR2 offers a great wealth of information on the Milky Way and reveals clear non-axisymmetric kinematic signatures within the Galactic disc, for instance. It is now up to the astronomical community to explore its full potential.</abstract><pub>EDP Sciences</pub><tpages>40</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-6361 |
| ispartof | Astronomy and astrophysics (Berlin), 2018-08 |
| issn | 0004-6361 |
| language | eng |
| recordid | cdi_csuc_recercat_oai_recercat_cat_2072_353878 |
| source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; Recercat; EZB-FREE-00999 freely available EZB journals |
| subjects | Discs (Astrofísica) Disks (Astrophysics) Galaxies Galàxies Milky Way Via Làctia |
| title | Gaia Data Release 2: Mapping the Milky Way disc kinematics |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-29T00%3A14%3A52IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-csuc&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Gaia%20Data%20Release%202:%20Mapping%20the%20Milky%20Way%20disc%20kinematics&rft.jtitle=Astronomy%20and%20astrophysics%20(Berlin)&rft.au=Romero%20G%C3%B3mez,%20Merc%C3%A8&rft.date=2018-08&rft.issn=0004-6361&rft_id=info:doi/&rft_dat=%3Ccsuc%3Eoai_recercat_cat_2072_353878%3C/csuc%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true |