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

被引：130

作者：

Mignard, F. ^{[1
]}

Klioner, S. A. ^{[2
]}

Lindegren, L. ^{[3
]}

Hernandez, J. ^{[4
]}

Bastian, U. ^{[5
]}

Bombrun, A. ^{[6
]}

Hobbs, D. ^{[3
]}

Lammers, U. ^{[4
]}

Michalik, D. ^{[3
]}

Ramos-Lerate, M. ^{[7
]}

Biermann, M. ^{[5
]}

Fernandez-Hernandez, J. ^{[8
]}

Geyer, R. ^{[2
]}

Hilger, T. ^{[2
]}

Siddiqui, H. I. ^{[9
]}

Steidelmueller, H. ^{[2
]}

Babusiaux, C. ^{[10
,11
]}

Barache, C. ^{[12
]}

Lambert, S. ^{[12
]}

Andrei, A. H. ^{[12
,13
,14
]}

Bourda, G. ^{[15
]}

Charlot, P. ^{[15
]}

Brown, A. G. A. ^{[16
]}

Vallenari, A. ^{[17
]}

Prusti, T. ^{[18
]}

de Bruijne, J. H. J. ^{[18
]}

Bailer-Jones, C. A. L. ^{[19
]}

Evans, D. W. ^{[20
]}

Eyer, L. ^{[21
]}

Jansen, F. ^{[22
]}

Jordi, C. ^{[23
]}

Luri, X. ^{[23
]}

Panem, C. ^{[24
]}

Pourbaix, D. ^{[25
,26
]}

Randich, S. ^{[27
]}

Sartoretti, P. ^{[10
]}

Soubiran, C. ^{[15
]}

van Leeuwen, F. ^{[20
]}

Walton, N. A. ^{[20
]}

Arenou, F. ^{[10
]}

Cropper, M. ^{[28
]}

Drimmel, R. ^{[29
]}

Katz, D. ^{[10
]}

Lattanzi, M. G. ^{[29
]}

Bakker, J. ^{[4
]}

Cacciari, C. ^{[30
]}

Castaneda, J. ^{[23
]}

Chaoul, L. ^{[24
]}

Cheek, N. ^{[31
]}

De Angeli, F. ^{[20
]}

机构：

[1] Univ Cote Azur, CNRS, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice 4, France

[2] Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany

[3] Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden

[4] European Space Astron Ctr ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[5] Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, Monchhofstr 12-14, D-69120 Heidelberg, Germany

[6] HE Space Operat BV ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[7] Vitrociset Belgium ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[8] ATG Europe ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[9] Telespazio Vega UK Ltd ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[10] Univ PSL, CNRS, GEPI, Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France

[11] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France

[12] Sorbonne Univ, CNRS, SYRTE, Observ Paris,Univ PSL,LNE, 61 Ave Observ, F-75014 Paris, France

[13] ON MCTI BR, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[14] OV UFRJ BR, Ladeira Pedro Antonio 43, BR-20080 Rio De Janeiro, RJ, Brazil

[15] Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, Allee Geoffroy St Hilaire, F-33615 Pessac, France

[16] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[17] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[18] European Space Res & Technol Ctr ESA ESTEC, Sci Support Off, Directorate Sci, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[19] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[20] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[21] Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland

[22] European Space Res & Technol Ctr ESA ESTEC, Mission Operat Div, Operat Dept, Directorate Sci, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[23] Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti & Franques 1, Barcelona 08028, Spain

[24] CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-9 Toulouse 9, France

[25] Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium

[26] FRS FNRS, Rue Egmont 5, B-1000 Brussels, Belgium

[27] INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

[28] Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England

[29] INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, TO, Italy

[30] INAF Osservatorio Astrofis & Sci Spazio Bologn, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[31] Serco Gest Negocios ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[32] ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy

[33] Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland

[34] ESAC, Gaia DPAC Project Off, Camino Bajo Castillo S-N, Madrid 28692, Spain

[35] Natl Observ Athens, Athens 15236, Greece

[36] Univ Lille, Sorbonne Univ, IMCCE, Observ Paris,Univ PSL, 77 Av Denfert Rochereau, F-75014 Paris, France

[37] Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium

[38] Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[39] Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium

[40] Univ Liege, Inst Astrophys & Geophys, 19c,Allee 6 Aout, B-4000 Liege, Belgium

[41] Univ Pablo Olavide, Area Lenguajes & Sistemas Informat, Ctra Utrera,Km 1, Seville 41013, Spain

[42] Univ Vigo, ETSE Telecomun, Campus Lagoas Marcosende, Vigo 36310, Galicia, Spain

[43] Large Synopt Survey Telescope, 950 N Cherry Ave, Tucson, AZ 85719 USA

[44] Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, 11 Rue Univ, F-67000 Strasbourg, France

[45] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambride CB3 0HA, England

[46] Aurora Technol ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[47] Univ Montpellier, Lab Univers & Particules Montpellier, Pl Eugene Bataillon,CC72, F-34095 Montpellier 05, France

[48] Uppsala Univ, Div Astron & Space Phys, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[49] Univ Lisbon, CENTRA, FCUL, Edif C8, P-1749016 Lisbon, Portugal

[50] Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 616卷

关键词：

astrometry; reference systems; catalogs;

D O I：

10.1051/0004-6361/201832916

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar or equal to 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 = 20 mag. Large-scale systematics are estimated to be in the range 20 to 30 mu as. 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.

引用

页数：15

共 50 条

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Lindegren, L.
Mignard, F.
Hernandez, J.
Ramos-Lerate, M.
Bastian, U.
Biermann, M.
Bombrun, A.
de Torres, A.
Gerlach, E.
Geyer, R.
Hilger, T.
Hobbs, D.
Lammers, U. L.
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Steidelmueller, H.
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