Gaia Data Release 2

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 radi...

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Published in:Astronomy and astrophysics (Berlin) 2019-02, Vol.622
Main Authors: Katz, D., Sartoretti, P., Cropper, M., Panuzzo, P., Seabroke, G. M., Viala, Y., Benson, K., Blomme, R., Jasniewicz, G., Jean-Antoine, A., Huckle, H., Smith, M., Baker, S., Crifo, F., Damerdji, Y., David, M., Dolding, C., Frémat, Y., Gosset, E., Guerrier, A., Guy, L. P., Haigron, R., Janßen, K., Marchal, O., Plum, G., Soubiran, C., Thévenin, F., Ajaj, M., Allende Prieto, C., Babusiaux, C., Boudreault, S., Chemin, L., Delle Luche, C., Fabre, C., Gueguen, A., Hambly, N. C., Lasne, Y., Meynadier, F., Pailler, F., Panem, C., Royer, F., Tauran, G., Zurbach, C., Zwitter, T., Arenou, F., Bossini, D., Gerssen, J., Gómez, A., Lemaitre, V., Leclerc, N., Morel, T., Munari, U., Turon, C., Vallenari, A., Žerjal, M.
Format: Article
Language:English
Subjects:
Radial velocity
surveys
techniques: radial velocities
techniques: spectroscopic
Test procedures
Uncertainty
Velocity
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cited_by cdi_FETCH-LOGICAL-c1613-7971c6a2900e97946eb54cafb6b2bbadad6df522d3e8ec0a3cc5cf80c3b57f3b3
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container_title Astronomy and astrophysics (Berlin)
container_volume 622
creator Katz, D.
Sartoretti, P.
Cropper, M.
Panuzzo, P.
Seabroke, G. M.
Viala, Y.
Benson, K.
Blomme, R.
Jasniewicz, G.
Jean-Antoine, A.
Huckle, H.
Smith, M.
Baker, S.
Crifo, F.
Damerdji, Y.
David, M.
Dolding, C.
Frémat, Y.
Gosset, E.
Guerrier, A.
Guy, L. P.
Haigron, R.
Janßen, K.
Marchal, O.
Plum, G.
Soubiran, C.
Thévenin, F.
Ajaj, M.
Allende Prieto, C.
Babusiaux, C.
Boudreault, S.
Chemin, L.
Delle Luche, C.
Fabre, C.
Gueguen, A.
Hambly, N. C.
Lasne, Y.
Meynadier, F.
Pailler, F.
Panem, C.
Royer, F.
Tauran, G.
Zurbach, C.
Zwitter, T.
Arenou, F.
Bossini, D.
Gerssen, J.
Gómez, A.
Lemaitre, V.
Leclerc, N.
Morel, T.
Munari, U.
Turon, C.
Vallenari, A.
Žerjal, M.
description 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 ∈ [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.
doi_str_mv 10.1051/0004-6361/201833273
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M. ; Viala, Y. ; Benson, K. ; Blomme, R. ; Jasniewicz, G. ; Jean-Antoine, A. ; Huckle, H. ; Smith, M. ; Baker, S. ; Crifo, F. ; Damerdji, Y. ; David, M. ; Dolding, C. ; Frémat, Y. ; Gosset, E. ; Guerrier, A. ; Guy, L. P. ; Haigron, R. ; Janßen, K. ; Marchal, O. ; Plum, G. ; Soubiran, C. ; Thévenin, F. ; Ajaj, M. ; Allende Prieto, C. ; Babusiaux, C. ; Boudreault, S. ; Chemin, L. ; Delle Luche, C. ; Fabre, C. ; Gueguen, A. ; Hambly, N. C. ; Lasne, Y. ; Meynadier, F. ; Pailler, F. ; Panem, C. ; Royer, F. ; Tauran, G. ; Zurbach, C. ; Zwitter, T. ; Arenou, F. ; Bossini, D. ; Gerssen, J. ; Gómez, A. ; Lemaitre, V. ; Leclerc, N. ; Morel, T. ; Munari, U. ; Turon, C. ; Vallenari, A. ; Žerjal, M.</creator><creatorcontrib>Katz, D. ; Sartoretti, P. ; Cropper, M. ; Panuzzo, P. ; Seabroke, G. 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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 ∈ [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. 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Notwithstanding the ProQuest Terms and conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c1613-7971c6a2900e97946eb54cafb6b2bbadad6df522d3e8ec0a3cc5cf80c3b57f3b3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Katz, D.</creatorcontrib><creatorcontrib>Sartoretti, P.</creatorcontrib><creatorcontrib>Cropper, M.</creatorcontrib><creatorcontrib>Panuzzo, P.</creatorcontrib><creatorcontrib>Seabroke, G. 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C.</creatorcontrib><creatorcontrib>Lasne, Y.</creatorcontrib><creatorcontrib>Meynadier, F.</creatorcontrib><creatorcontrib>Pailler, F.</creatorcontrib><creatorcontrib>Panem, C.</creatorcontrib><creatorcontrib>Royer, F.</creatorcontrib><creatorcontrib>Tauran, G.</creatorcontrib><creatorcontrib>Zurbach, C.</creatorcontrib><creatorcontrib>Zwitter, T.</creatorcontrib><creatorcontrib>Arenou, F.</creatorcontrib><creatorcontrib>Bossini, D.</creatorcontrib><creatorcontrib>Gerssen, J.</creatorcontrib><creatorcontrib>Gómez, A.</creatorcontrib><creatorcontrib>Lemaitre, V.</creatorcontrib><creatorcontrib>Leclerc, N.</creatorcontrib><creatorcontrib>Morel, T.</creatorcontrib><creatorcontrib>Munari, U.</creatorcontrib><creatorcontrib>Turon, C.</creatorcontrib><creatorcontrib>Vallenari, A.</creatorcontrib><creatorcontrib>Žerjal, M.</creatorcontrib><title>Gaia Data Release 2</title><title>Astronomy and astrophysics (Berlin)</title><description>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 ∈ [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. 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C.</creatorcontrib><creatorcontrib>Lasne, Y.</creatorcontrib><creatorcontrib>Meynadier, F.</creatorcontrib><creatorcontrib>Pailler, F.</creatorcontrib><creatorcontrib>Panem, C.</creatorcontrib><creatorcontrib>Royer, F.</creatorcontrib><creatorcontrib>Tauran, G.</creatorcontrib><creatorcontrib>Zurbach, C.</creatorcontrib><creatorcontrib>Zwitter, T.</creatorcontrib><creatorcontrib>Arenou, F.</creatorcontrib><creatorcontrib>Bossini, D.</creatorcontrib><creatorcontrib>Gerssen, J.</creatorcontrib><creatorcontrib>Gómez, A.</creatorcontrib><creatorcontrib>Lemaitre, V.</creatorcontrib><creatorcontrib>Leclerc, N.</creatorcontrib><creatorcontrib>Morel, T.</creatorcontrib><creatorcontrib>Munari, U.</creatorcontrib><creatorcontrib>Turon, C.</creatorcontrib><creatorcontrib>Vallenari, A.</creatorcontrib><creatorcontrib>Žerjal, M.</creatorcontrib><collection>Istex</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Katz, D.</au><au>Sartoretti, P.</au><au>Cropper, M.</au><au>Panuzzo, P.</au><au>Seabroke, G. M.</au><au>Viala, Y.</au><au>Benson, K.</au><au>Blomme, R.</au><au>Jasniewicz, G.</au><au>Jean-Antoine, A.</au><au>Huckle, H.</au><au>Smith, M.</au><au>Baker, S.</au><au>Crifo, F.</au><au>Damerdji, Y.</au><au>David, M.</au><au>Dolding, C.</au><au>Frémat, Y.</au><au>Gosset, E.</au><au>Guerrier, A.</au><au>Guy, L. P.</au><au>Haigron, R.</au><au>Janßen, K.</au><au>Marchal, O.</au><au>Plum, G.</au><au>Soubiran, C.</au><au>Thévenin, F.</au><au>Ajaj, M.</au><au>Allende Prieto, C.</au><au>Babusiaux, C.</au><au>Boudreault, S.</au><au>Chemin, L.</au><au>Delle Luche, C.</au><au>Fabre, C.</au><au>Gueguen, A.</au><au>Hambly, N. C.</au><au>Lasne, Y.</au><au>Meynadier, F.</au><au>Pailler, F.</au><au>Panem, C.</au><au>Royer, F.</au><au>Tauran, G.</au><au>Zurbach, C.</au><au>Zwitter, T.</au><au>Arenou, F.</au><au>Bossini, D.</au><au>Gerssen, J.</au><au>Gómez, A.</au><au>Lemaitre, V.</au><au>Leclerc, N.</au><au>Morel, T.</au><au>Munari, U.</au><au>Turon, C.</au><au>Vallenari, A.</au><au>Žerjal, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gaia Data Release 2</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2019-02-01</date><risdate>2019</risdate><volume>622</volume><issn>0004-6361</issn><eissn>1432-0746</eissn><notes>e-mail: david.katz@obspm.fr</notes><notes>istex:917E5B91A976E4D08550923F9CC54512B5CBD099</notes><notes>ark:/67375/80W-BW878WCQ-K</notes><notes>dkey:10.1051/0004-6361/201833273</notes><notes>href:https://www.aanda.org/articles/aa/abs/2019/02/aa33273-18/aa33273-18.html</notes><notes>bibcode:2019A%26A...622A.205K</notes><notes>publisher-ID:aa33273-18</notes><abstract>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 ∈ [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.</abstract><cop>Heidelberg</cop><pub>EDP Sciences</pub><doi>10.1051/0004-6361/201833273</doi><tpages>19</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0004-6361
ispartof Astronomy and astrophysics (Berlin), 2019-02, Vol.622
issn 0004-6361
1432-0746
language eng
recordid cdi_proquest_journals_2187026656
source EZB Electronic Journals Library
subjects Radial velocity
surveys
techniques: radial velocities
techniques: spectroscopic
Test procedures
Uncertainty
Velocity
title Gaia Data Release 2
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