Article (Scientific journals)
Gaia Data Release 2: Properties and validation of the radial velocities
Katz, D.; Sartoretti, P.; Cropper, M. et al.
2019In Astronomy and Astrophysics, 622, p. 205
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Keywords :
Catalogs; Surveys; Techniques: Radial velocities; Techniques: Spectroscopic; Spectrometers; Stars; Surveying; Uncertainty analysis; Effective temperature; Quality test; Radial velocity; Radial velocity spectrometer; Sky coverage; Velocity
Abstract :
[en] Context. For Gaia DR2, 280 million spectra collected by the Radial Velocity Spectrometer instrument on board Gaia were processed, and median radial velocities were derived for 9.8 million sources brighter than GRVS = 12 mag. Aims. This paper describes the validation and properties of the median radial velocities published in Gaia DR2. Methods. Quality tests and filters were applied to select those of the 9.8 million radial velocities that have the quality to be published in Gaia DR2. The accuracy of the selected sample was assessed with respect to ground-based catalogues. Its precision was estimated using both ground-based catalogues and the distribution of the Gaia radial velocity uncertainties. Results. Gaia DR2 contains median radial velocities for 7 224 631 stars, with Teff in the range [3550; 6900] K, which successfully passed the quality tests. The published median radial velocities provide a full-sky coverage and are complete with respect to the astrometric data to within 77.2% (for G ≤ 12:5 mag). The median radial velocity residuals with respect to the ground-based surveys vary from one catalogue to another, but do not exceed a few 100 m s-1. In addition, the Gaia radial velocities show a positive trend as a function of magnitude, which starts around GRVS ∼ 9 mag and reaches about +500 m s-1 at GRVS = 11:75 mag. The origin of the trend is under investigation, with the aim to correct for it in Gaia DR3. The overall precision, estimated from the median of the Gaia radial velocity uncertainties, is 1.05 km s-1. The radial velocity precision is a function of many parameters, in particular, the magnitude and effective temperature. For bright stars, GRVS 2 [4; 8] mag, the precision, estimated using the full dataset, is in the range 220-350 m s-1, which is about three to five times more precise than the pre-launch specification of 1 km s-1. At the faint end, GRVS = 11:75 mag, the precisions for Teff = 5000 and 6500 K are 1.4 and 3.7 km s-1, respectively. © 2018 Springer Verlag. All Rights Reserved.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Katz, D.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Sartoretti, P.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Cropper, M.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Panuzzo, P.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Seabroke, G. M.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Viala, Y.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Benson, K.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Blomme, R.;  Royal Observatory of Belgium, Ringlaan 3, Brussels, 1180, Belgium
Jasniewicz, G.;  Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS, Place Eugène Bataillon, CC72, Montpellier Cedex 05, 34095, France
Jean-Antoine, A.;  CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Huckle, H.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Smith, M.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Baker, S.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Crifo, F.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Damerdji, Yassine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
David, M.;  Universiteit Antwerpen, Onderzoeksgroep Toegepaste Wiskunde, Middelheimlaan 1, Antwerpen, 2020, Belgium
Dolding, C.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom
Frémat, Y.;  Royal Observatory of Belgium, Ringlaan 3, Brussels, 1180, Belgium
Gosset, Eric ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Guerrier, A.;  Thales Services for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Guy, L. P.;  Department of Astronomy, University of Geneva, Chemin d'Ecogia 16, Versoix, CH-1290, Switzerland
Haigron, R.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Janßen, K.;  Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, Potsdam, 14482, Germany
Marchal, O.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Plum, G.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Soubiran, C.;  Laboratoire d'Astrophysique de Bordeaux, Université de Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, Pessac, 33615, France
Thévenin, F.;  Laboratoire Lagrange, Université Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, CS 34229, Nice Cedex, 06304, France
Ajaj, M.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Allende Prieto, C.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom, Instituto de Astrofísica de Canarias, La Laguna, Tenerife, 38205, Spain, Universidad de la Laguna, Departamento de Astrofísica, La Laguna, Tenerife, 38206, Spain
Babusiaux, C.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France, Université Grenoble Alpes, CNRS, IPAG, Grenoble, 38000, France
Boudreault, S.;  Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, United Kingdom, Max Plank Institute für Sonnensystemforschung, Justus-von-Liebig-Weg 3, Göttingen, 37077, Germany
Chemin, L.;  Laboratoire d'Astrophysique de Bordeaux, Université de Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, Pessac, 33615, France, Unidad de Astronomía, Fac. Cs. Básicas, Universidad de Antofagasta, Avda. U. de Antofagasta, Antofagasta, 02800, Chile
Delle Luche, C.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France, Thales Services for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Fabre, C.;  ATOS for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Gueguen, A.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France, Max Planck Institute for Extraterrestrial Physics, High Energy Group, Gießenbachstraße, Garching, 85741, Germany
Hambly, N. C.;  Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, United Kingdom
Lasne, Y.;  CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Meynadier, F.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France, LNE-SYRTE, Observatoire de Paris, Université PSL, 61 avenue de l'Observatoire, Paris, 75014, France
Pailler, F.;  CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Panem, C.;  CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Royer, F.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Tauran, G.;  CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Zurbach, C.;  Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS, Place Eugène Bataillon, CC72, Montpellier Cedex 05, 34095, France
Zwitter, T.;  Faculty of Mathematics and Physics, University of Ljubljana, Jadranska ulica 19, Ljubljana, 1000, Slovenia
Arenou, F.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Bossini, D.;  INAF-Osservatorio Astronomico di Padova, vicolo Osservatorio 5, Padova, 35122, Italy
Gerssen, J.;  Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, Potsdam, 14482, Germany
Gómez, A.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Lemaitre, V.;  CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, 31401, France
Leclerc, N.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Morel, Thierry  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Munari, U.;  INAF Astronomical Observatory of Padova, Asiago (VI), 36012, Italy
Turon, C.;  GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, Meudon, 92190, France
Vallenari, A.;  INAF-Osservatorio Astronomico di Padova, vicolo Osservatorio 5, Padova, 35122, Italy
Erjal, M.;  Faculty of Mathematics and Physics, University of Ljubljana, Jadranska ulica 19, Ljubljana, 1000, Slovenia, Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
More authors (45 more) Less
Language :
English
Title :
Gaia Data Release 2: Properties and validation of the radial velocities
Publication date :
February 2019
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
622
Pages :
A205
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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