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Gaia Data Release 2. The celestial reference frame (Gaia-CRF2)

F. Mignard 1 S. Klioner L. Lindegren J. Hernandez U. Bastian 2 A. Bombrun D. Hobbs U. Lammers D. Michalik M. Ramos-Lerate M. Biermann J. Fernández-Hernández R. Geyer T. Hilger H. Siddiqui H. Steidelmüller C. Babusiaux 3 C. Barache 4 S. Lambert 4 H. Andrei 4 G. Bourda A. Brown A. Vallenari T. Prusti 5 J. de Bruijne C. Bailer-Jones D. Evans L. Eyer 6 F. Jansen 7 C. Jordi X. Luri 8 C. Panem D. Pourbaix 9 S. Randich P. Sartoretti 3 C. Soubiran F. van Leeuwen A. Walton F. Arenou 3 M. Cropper R. Drimmel D. Katz 3 M. Lattanzi 10 J. Bakker C. Cacciari 11 J. Castañeda L. Chaoul N. Cheek F. de Angeli 12 C. Fabricius 13 R. Guerra 14 B. Holl E. Masana R. Messineo N. Mowlavi K. Nienartowicz P. Panuzzo 3 J. Portell M. Riello M. Seabroke P. Tanga 1 F. Thevenin 1 G. Gracia-Abril G. Comoretto M. Garcia-Reinaldos D. Teyssier M. Altmann 4 R. Andrae M. Audard 15 I. Bellas-Velidis K. Benson J. Berthier 16 R. Blomme 17 P. Burgess 12 G. Busso 12 B. Carry 16, 1 A. Cellino 18 G. Clementini 19 M. Clotet O. Creevey 1 M. David J. de Ridder 20 L. Delchambre A. Dell’oro C. Ducourant M. Fouesneau Y. Frémat L. Galluccio 1 M. García-Torres J. González-Núñez J. González-Vidal E. Gosset 21 P. Guy J. Halbwachs C. Hambly D. Harrison D. Hestroffer 16 T. Hodgkin A. Hutton Gérard Jasniewicz 22 A. Jean-Antoine-Piccolo S. Jordan J. Korn A. Krone-Martins C. Lanza T. Lebzelter W. Löffler M. Manteiga M. Marrese J. Martín-Fleitas A. Moitinho 23 A. Mor K. Muinonen 24 J. Osinde E. Pancino 25 T. Pauwels 17 J. Petit 26 A. Recio-Blanco 1 J. Richards L. Rimoldini C. Robin M. Sarro C. Siopis M. Smith A. Sozzetti M. Süveges J. Torra W. van Reeven U. Abbas A. Abreu Aramburu S. Accart C. Aerts 27 G. Altavilla M. Álvarez R. Alvarez J. Alves R. Anderson E. Anglada Varela E. Antiche T. Antoja B. Arcay T. Astraatmadja 28 N. Bach S. Baker L. Balaguer-Nunez 29 P. Balm C. Barata D. Barbato F. Barblan S. Barklem D. Barrado 30 M. Barros M. Barstow 31 L. Bartholomé Muñoz J. Bassilana U. Becciani M. Bellazzini A. Berihuete Stefano Bertone 4 L. Bianchi 32 O. Bienaymé 33 S. Blanco-Cuaresma 34 T. Boch C. Boeche R. Borrachero D. Bossini S. Bouquillon 4 A. Bragaglia L. Bramante M. Breddels A. Bressan 35 N. Brouillet 36 T. Brüsemeister E. Brugaletta B. Bucciarelli A. Burlacu D. Busonero A. Butkevich R. Buzzi E. Caffau 3 R. Cancelliere G. Cannizzaro T. Cantat-Gaudin R. Carballo T. Carlucci 4 J. Carrasco 37 L. Casamiquela M. Castellani 38 A. Castro-Ginard L. Chemin A. Chiavassa 1 G. Cocozza G. Costigan S. Cowell 12 F. Crifo 3 M. Crosta C. Crowley J. Cuypers 17 C. Dafonte Y. Damerdji 39 A. Dapergolas P. David 16 P. de Laverny 1 F. de Luise 40 R. de March R. de Souza A. de Torres J. Debosscher 41 E. del Pozo M. Delbò 1 A. Delgado 42 H. Delgado S. Diakite 43 C. Diener E. Distefano C. Dolding P. Drazinos J. Duran B. Edvardsson 44 H. Enke K. Eriksson 44 P. Esquej G. Eynard Bontemps C. Fabre 45 M. Fabrizio 46 S. Faigler J. Falcão M. Farràs Casas L. Federici G. Fedorets P. Fernique 33 F. Figueras 47 F. Filippi 48 K. Findeisen 3 A. Fonti E. Fraile M. Fraser 49 B. Frézouls M. Gai 18 S. Galleti D. Garabato F. García-Sedano A. Garofalo 50 N. Garralda A. Gavel P. Gavras 3 J. Gerssen P. Giacobbe G. Gilmore S. Girona G. Giuffrida F. Glass M. Gomes M. Granvik A. Gueguen 3 A. Guerrier 51 J. Guiraud 52 R. Gutié R. Haigron 3 D. Hatzidimitriou 53 M. Hauser M. Haywood 3 U. Heiter 44 A. Helmi J. Heu 3 W. Hofmann G. Holland H. Huckle A. Hypki V. Icardi K. Janßen G. Jevardat de Fombelle G. Jonker A. Juhasz 12 F. Julbe A. Karampelas A. Kewley J. Klar A. Kochoska R. Kohley 54 K. Kolenberg M. Kontizas E. Kontizas S. Koposov G. Kordopatis 1 Z. Kostrzewa-Rutkowska P. Koubsky A. Lanza Y. Lasne 55 J. Lavigne Y. Le Fustec C. Le Poncin-Lafitte 56 Y. Lebreton 3, 57 S. Leccia N. Leclerc 3 I. Lecoeur-Taibi H. Lenhardt F. Leroux S. Liao 58 E. Licata H. Lindstrøm T. Lister E. Livanou A. Lobel 17 M. López S. Managau G. Mann 59 G. Mantelet 60 O. Marchal 3 J. Marchant 61 M. Marconi S. Marinoni G. Marschalkó J. Marshall M. Martino G. Marton 62 N. Mary D. Massari G. Matijevič T. Mazeh 63 J. Mcmillan S. Messina R. Millar 64 D. Molina R. Molinaro 65 L. Molnar 66 P. Montegriffo R. Mor R. Morbidelli T. Morel D. Morris 67 A. Mulone T. Muraveva I. Musella G. Nelemans L. Nicastro L. Noval W. O’mullane C. Ordenovic 1 D. Ordóñez-Blanco P. Osborne C. Pagani I. Pagano F. Pailler 68 H. Palacin L. Palaversa A. Panahi M. Pawlak M. Piersimoni F. Pineau E. Plachy G. Plum 3 E. Poggio E. Poujoulet A. Prša L. Pulone E. Racero S. Ragaini N. Rambaux 16 S. Regibo C. Reyle 69 F. Riclet V. Ripepi 70 A. Riva 71 A. Rivard G. Rixon 12 T. Roegiers M. Roelens 72 M. Romero-Gomez 73 N. Rowell F. Royer 3 L. Ruiz-Dern 51, 3 G. Sadowski T. Sagristà Sellés J. Sahlmann J. Salgado E. Salguero N. Sanna T. Santana-Ros 74 M. Sarasso H. Savietto M. Schultheis 1 E. Sciacca M. Segol C. Segovia D. Segransan 34 C. Shih 3 L. Siltala A. Silva R. Smart 18 W. Smith E. Solano 75 F. Solitro R. Sordo S. Soria Nieto J. Souchay 4 A. Spagna F. Spoto 16 U. Stampa A. Steele 76 C. Stephenson H. Stoev F. Suess J. Surdej 77 L. Szabados 78 E. Szegedi-Elek D. Tapiador F. Taris 4 G. Tauran M. Taylor R. Teixeira 79 D. Terrett P. Teyssandier 4 W. Thuillot 16 A. Titarenko 1 F. Torra Clotet C. Turon 3 A. Ulla E. Utrilla S. Uzzi M. Vaillant G. Valentini V. Valette A. van Elteren E. van Hemelryck M. van Leeuwen P. Charlot M. Vaschetto A. Vecchiato 80 J. Veljanoski Y. Viala 3 D. Vicente 81 S. Vogt C. von Essen H. Voss V. Votruba S. Voutsinas G. Walmsley M. Weiler O. Wertz T. Wevers 82 Ł. Wyrzykowski A. Yoldas 12 M. Žerjal H. Ziaeepour J. Zorec S. Zschocke 83 S. Zucker 84 C. Zurbach 22 T. Zwitter
36 FORMATION STELLAIRE 2018
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
80 Astrometry
OATo - INAF - Osservatorio Astrofisico di Torino
Abstract : Context. The second release of Gaia data (Gaia DR2) contains the astrometric parameters for more than half a million quasars. This set defines a kinematically non-rotating reference frame in the optical domain. A subset of these quasars have accurate VLBI positions that allow the axes of the reference frame to be aligned with the International Celestial Reference System (ICRF) radio frame. Aims: We describe the astrometric and photometric properties of the quasars that were selected to represent the celestial reference frame of Gaia DR2 (Gaia-CRF2), and to compare the optical and radio positions for sources with accurate VLBI positions. Methods: Descriptive statistics are used to characterise the overall properties of the quasar sample. Residual rotation and orientation errors and large-scale systematics are quantified by means of expansions in vector spherical harmonics. Positional differences are calculated relative to a prototype version of the forthcoming ICRF3. Results: Gaia-CRF2 consists of the positions of a sample of 556 869 sources in Gaia DR2, obtained from a positional cross-match with the ICRF3-prototype and AllWISE AGN catalogues. The sample constitutes a clean, dense, and homogeneous set of extragalactic point sources in the magnitude range G ≃ 16 to 21 mag with accurately known optical positions. The median positional uncertainty is 0.12 mas for G < 18 mag and 0.5 mas at G = mag. Large-scale systematics are estimated to be in the range 20 to 30 μas. The accuracy claims are supported by the parallaxes and proper motions of the quasars in Gaia DR2. The optical positions for a subset of 2820 sources in common with the ICRF3-prototype show very good overall agreement with the radio positions, but several tens of sources have significantly discrepant positions. Conclusions: Based on less than 40% of the data expected from the nominal Gaia mission, Gaia-CRF2 is the first realisation of a non-rotating global optical reference frame that meets the ICRS prescriptions, meaning that it is built only on extragalactic sources. Its accuracy matches the current radio frame of the ICRF, but the density of sources in all parts of the sky is much higher, except along the Galactic equator.
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F. Mignard, S. Klioner, L. Lindegren, J. Hernandez, U. Bastian, et al.. Gaia Data Release 2. The celestial reference frame (Gaia-CRF2). Astronomy and Astrophysics - A&A, EDP Sciences, 2018, 616, pp.id.A14. ⟨10.1051/0004-6361/201832916⟩. ⟨hal-01867238⟩

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