2018A&A...616A..11G

Query : 2018A&A...616A..11G

2018A&A...616A..11G - Astronomy and Astrophysics, volume 616A, 11-11 (2018/8-1)

Gaia Data Release 2. Mapping the Milky Way disc kinematics.

GAIA COLLABORATION, KATZ D., ANTOJA T., ROMERO-GOMEZ M., DRIMMEL R., REYLE C., SEABROKE G.M., SOUBIRAN C., BABUSIAUX C., DI MATTEO P., FIGUERAS F., POGGIO E., ROBIN A.C., EVANS D.W., BROWN A.G.A., VALLENARI A., PRUSTI T., DE BRUIJNE J.H.J., BAILER-JONES C.A.L., BIERMANN M., EYER L., JANSEN F., JORDI C., KLIONER S.A., LAMMERS U., LINDEGREN L., LURI X., MIGNARD F., PANEM C., POURBAIX D., RANDICH S., SARTORETTI P., SIDDIQUI H.I., VAN LEEUWEN F., WALTON N.A., ARENOU F., BASTIAN U., CROPPER M., LATTANZI M.G., BAKKER J., CACCIARI C., CASTA J.N., CHAOUL L., CHEEK N., DE ANGELI F., FABRICIUS C., GUERRA R., HOLL B., MASANA E., MESSINEO R., MOWLAVI N., NIENARTOWICZ K., PANUZZO P., PORTELL J., RIELLO M., TANGA P., THEVENIN F., GRACIA-ABRIL G., COMORETTO G., GARCIA-REINALDOS M., TEYSSIER D., ALTMANN M., ANDRAE R., AUDARD M., BELLAS-VELIDIS I., BENSON K., BERTHIER J., BLOMME R., BURGESS P., BUSSO G., CARRY B., CELLINO A., CLEMENTINI G., CLOTET M., CREEVEY O., DAVIDSON M., DE RIDDER J., DELCHAMBRE L., DELL'ORO A., DUCOURANT C., FERNANDEZ-HERNANDEZ J., FOUESNEAU M., FREMAT Y., GALLUCCIO L., GARCIA-TORRES M., GONZALEZ-NUNEZ J., GONZALEZ-VIDAL J.J., GOSSET E., GUY L.P., HALBWACHS J.-L., HAMBLY N.C., HARRISON D.L., HERNANDEZ J., HESTROFFER D., HODGKIN S.T., HUTTON A., JASNIEWICZ G., JEAN-ANTOINE-PICCOLO A., JORDAN S., KORN A.J., KRONE-MARTINS A., LANZAFAME A.C., LEBZELTER T., LOFFLER W., MANTEIGA M., MARRESE P.M., MARTIN-FLEITAS J.M., MOITINHO A., MORA A., MUINONEN K., OSINDE J., PANCINO E., PAUWELS T., PETIT J.-M., RECIO-BLANCO A., RICHARDS P.J., RIMOLDINI L., SARRO L.M., SIOPIS C., SMITH M., SOZZETTI A., SUVEGES M., TORRA J., VAN REEVEN W., ABBAS U., ABREU ARAMBURU A., ACCART S., AERTS C., ALTAVILLA G., ALVAREZ M.A., ALVAREZ R., ALVES J., ANDERSON R.I., ANDREI A.H., ANGLADA VARELA E., ANTICHE E., ARCAY B., ASTRAATMADJA T.L., BACH N., BAKER S.G., BALAGUER-NUNEZ L., BALM P., BARACHE C., BARATA C., BARBATO D., BARBLAN F., BARKLEM P.S., BARRADO D., BARROS M., BARSTOW M.A., BARTHOLOME MUNOZ L., BASSILANA J.-L., BECCIANI U., BELLAZZINI M., BERIHUETE A., BERTONE S., BIANCHI L., BIENAYME O., BLANCO-CUARESMA S., BOCH T., BOECHE C., BOMBRUN A., BORRACHERO R., BOSSINI D., BOUQUILLON S., BOURDA G., BRAGAGLIA A., BRAMANTE L., BREDDELS M.A., BRESSAN A., BROUILLET N., BRUSEMEISTER T., BRUGALETTA E., BUCCIARELLI B., BURLACU A., BUSONERO D., BUTKEVICH A.G., BUZZI R., CAFFAU E., CANCELLIERE R., CANNIZZARO G., CANTAT-GAUDIN T., CARBALLO R., CARLUCCI T., CARRASCO J.M., CASAMIQUELA L., CASTELLANI M., CASTRO-GINARD A., CHARLOT P., CHEMIN L., CHIAVASSA A., COCOZZA G., COSTIGAN G., COWELL S., CRIFO F., CROSTA M., CROWLEY C., CUYPERS J., DAFONTE C., DAMERDJI Y., DAPERGOLAS A., DAVID P., DAVID M., DE LAVERNY P., DE LUISE F., DE MARCH R., DE SOUZA R., DE TORRES A., DEBOSSCHER J., DEL POZO E., DELBO M., DELGADO A., DELGADO H.E., DIAKITE S., DIENER C., DISTEFANO E., DOLDING C., DRAZINOS P., DURAN J., EDVARDSSON B., ENKE H., ERIKSSON K., ESQUEJ P., EYNARD BONTEMPS G., FABRE C., FABRIZIO M., FAIGLER S., FALC A.J.A., FARRAS CASAS M., FEDERICI L., FEDORETS G., FERNIQUE P., FILIPPI F., FINDEISEN K., FONTI A., FRAILE E., FRASER M., FREZOULS B., GAI M., GALLETI S., GARABATO D., GARCIA-SEDANO F., GAROFALO A., GARRALDA N., GAVEL A., GAVRAS P., GERSSEN J., GEYER R., GIACOBBE P., GILMORE G., GIRONA S., GIUFFRIDA G., GLASS F., GOMES M., GRANVIK M., GUEGUEN A., GUERRIER A., GUIRAUD J., GUTIE R., HAIGRON R., HATZIDIMITRIOU D., HAUSER M., HAYWOOD M., HEITER U., HELMI A., HEU J., HILGER T., HOBBS D., HOFMANN W., HOLLAND G., HUCKLE H.E., HYPKI A., ICARDI V., JANSSEN K., JEVARDAT DE FOMBELLE G., JONKER P.G., JUHASZ A.L., JULBE F., KARAMPELAS A., KEWLEY A., KLAR J., KOCHOSKA A., KOHLEY R., KOLENBERG K., KONTIZAS M., KONTIZAS E., KOPOSOV S.E., KORDOPATIS G., KOSTRZEWA-RUTKOWSKA Z., KOUBSKY P., LAMBERT S., LANZA A.F., LASNE Y., LAVIGNE J.-B., LE FUSTEC Y., LE PONCIN-LAFITTE C., LEBRETON Y., LECCIA S., LECLERC N., LECOEUR-TAIBI I., LENHARDT H., LEROUX F., LIAO S., LICATA E., LINDSTROM H.E.P., LISTER T.A., LIVANOU E., LOBEL A., LOPEZ M., MANAGAU S., MANN R.G., MANTELET G., MARCHAL O., MARCHANT J.M., MARCONI M., MARINONI S., MARSCHALKO G., MARSHALL D.J., MARTINO M., MARTON G., MARY N., MASSARI D., MATIJEVIC G., MAZEH T., McMILLAN P.J., MESSINA S., MICHALIK D., MILLAR N.R., MOLINA D., MOLINARO R., MOLNAR L., MONTEGRIFFO P., MOR R., MORBIDELLI R., MOREL T., MORRIS D., MULONE A.F., MURAVEVA T., MUSELLA I., NELEMANS G., NICASTRO L., NOVAL L., O'MULLANE W., ORDENOVIC C., ORDONEZ-BLANCO D., OSBORNE P., PAGANI C., PAGANO I., PAILLER F., PALACIN H., PALAVERSA L., PANAHI A., PAWLAK M., PIERSIMONI A.M., PINEAU F.-X., PLACHY E., PLUM G., POUJOULET E., PRSA A., PULONE L., RACERO E., RAGAINI S., RAMBAUX N., RAMOS-LERATE M., REGIBO S., RICLET F., RIPEPI V., RIVA A., RIVARD A., RIXON G., ROEGIERS T., ROELENS M., ROWELL N., ROYER F., RUIZ-DERN L., SADOWSKI G., SAGRISTA SELLES T., SAHLMANN J., SALGADO J., SALGUERO E., SANNA N., SANTANA-ROS T., SARASSO M., SAVIETTO H., SCHULTHEIS M., SCIACCA E., SEGOL M., SEGOVIA J.C., SEGRANSAN D., SHIH I.-C., SILTALA L., SILVA A.F., SMART R.L., SMITH K.W., SOLANO E., SOLITRO F., SORDO R., SORIA NIETO S., SOUCHAY J., SPAGNA A., SPOTO F., STAMPA U., STEELE I.A., STEIDELMULLER H., STEPHENSON C.A., STOEV H., SUESS F.F., SURDEJ J., SZABADOS L., SZEGEDI-ELEK E., TAPIADOR D., TARIS F., TAURAN G., TAYLOR M.B., TEIXEIRA R., TERRETT D., TEYSSANDIER P., THUILLOT W., TITARENKO A., TORRA CLOTET F., TURON C., ULLA A., UTRILLA E., UZZI S., VAILLANT M., VALENTINI G., VALETTE V., VAN ELTEREN A., VAN HEMELRYCK E., VAN LEEUWEN M., VASCHETTO M., VECCHIATO A., VELJANOSKI J., VIALA Y., VICENTE D., VOGT S., VON ESSEN C., VOSS H., VOTRUBA V., VOUTSINAS S., WALMSLEY G., WEILER M., WERTZ O., WEVERS T., WYRZYKOWSKI L., YOLDAS A., ZERJAL M., ZIAEEPOUR H., ZOREC J., ZSCHOCKE S., ZUCKER S., ZURBACH C. and ZWITTER T.

Abstract (from CDS):

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 G_RVS=12mag. 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 (σ_p/p≤20%), and precise Galactic cylindrical velocities (median uncertainties of 0.9-1.4km/s and 20% of the stars with uncertainties smaller than 1km/s on all three components). From this sample, we extracted a sub-sample of 3.2 million giant stars to map the velocity field of the Galactic disc from ∼5kpc to ∼13kpc from the Galactic centre and up to 2kpc above and below the plane. We also study the distribution of 0.3 million solar neighbourhood stars (r<200pc), with median velocity uncertainties of 0.4km/s, 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 Copyright: © ESO 2018

Journal keyword(s): Galaxy: kinematics and dynamics - Galaxy: disk - solar neighborhood

VizieR on-line data: <CDS Catalogue: I/345>

Simbad objects: 20

Full paper

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Number of rows : 20

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	NAME Magellanic Clouds	GrG	03 00	-71.0						~	6555	1
2	Cl Melotte 20	OpC	03 26 28	+48 58.5						~	819	0
3	Cl Melotte 22	OpC	03 46 24	+24 06.8						~	3279	0
4	Cl Melotte 25	OpC	04 29 47	+16 56.9						~	2928	0
5	NAME LMC	G	05 23 34.6	-69 45 22			0.4			~	16509	1
6	NGC 2451A	OpC	07 42 57	-38 15.8						~	113	0
7	NGC 2632	OpC	08 40 13	+19 37.3						~	1449	0
8	IC 2391	OpC	08 41 10	-52 59.5						~	795	0
9	IC 2602	OpC	10 42 27	-64 25.6						~	640	0
10	Cl Melotte 111	OpC	12 24 03	+25 39.1						~	454	0
11	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000						~	13433	0
12	NAME Sgr A*	X	17 45 40.03599	-29 00 28.1699						~	4041	3
13	* alf Lyr	dS*	18 36 56.33635	+38 47 01.2802	0.03	0.03	0.03	0.07	0.10	A0Va	2623	0
14	NAME SDG	G	18 55 03.1	-30 28 42		4.5	3.6			~	2031	2
15	NAME Outer Arm	PoG	21 48	+69.4						~	288	0
16	NAME Galactic Bar	reg	~	~						~	1110	0
17	NAME Hercules Stream	MGr	~	~						~	221	0
18	NAME Monoceros Stream	St*	~	~						~	344	1
19	NAME Local Arm	reg	~	~						~	486	0
20	NAME Sirius Moving Group	MGr	~	~						~	99	0

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