J/A+A/649/A3ivo://CDS.VizieR/J/A+A/649/A3doi:10.26093/cds/vizier.36490003CDSRiello M.De Angeli F.Evans D.W.Montegriffo P.Carrasco J.M,Busso G.Palaversa L.Burgess P.Diener C.Davidson M.Rowell N.,Fabricius C.Jordi C.Bellazzini M.Pancino E.Harrison D.L.,Cacciari C.van Leeuwen F.Hambly N.C.Hodgkin S.T.Osborne P.J.,Altavilla G.Barstow M.A.Brown A.G.A.Castellani M.Cowell S.,De Luise F.Gilmore G.Giuffrida G.Hidalgo S.Holland G.Marinoni S.,Pagani C.Piersimoni A.M.Pulone L.Ragaini S.Rainer M.Richards P.J.,Sanna N.Walton N.A.Weiler M.Yoldas A.2021-09-16T10:44:29Z2021-04-28T07:46:23ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysvisible-astronomynarrow-band-photometryGaia Early Data Release 3 (Gaia EDR3) contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the European Space Agency Gaia satellite during the first 34 months of its operational phase. In this paper, we focus on the photometric content, describing the input data, the algorithms, the processing, and the validation of the results. Particular attention is given to the quality of the data and to a number of features that users may need to take into account to make the best use of the Gaia EDR3 catalogue. The processing broadly followed the same procedure as for Gaia DR2, but with significant improvements in several aspects of the blue and red photometer (BP and RP) preprocessing and in the photometric calibration process. In particular, the treatment of the BP and RP background has been updated to include a better estimation of the local background, and the detection of crowding effects has been used to exclude affected data from the calibrations. The photometric calibration models have also been updated to account for flux loss over the whole magnitude range. Significant improvements in the modelling and calibration of the Gaia point and line spread functions have also helped to reduce a number of instrumental effects that were still present in DR2. Gaia EDR3 contains 1.806 billion sources with G-band photometry and 1.540 billion sources with GBP and GRP photometry. The median uncertainty in the G-band photometry, as measured from the standard deviation of the internally calibrated mean photometry for a given source, is 0.2mmag at magnitude G=10 to 14, 0.8mmag at G~17, and 2.6mmag at G~19. The significant magnitude term found in the Gaia DR2 photometry is no longer visible, and overall there are no trends larger than 1mmag/mag. Using one passband over the whole colour and magnitude range leaves no systematics above the 1% level in magnitude in any of the bands, and a larger systematic is present for a very small sample of bright and blue sources. A detailed description of the residual systematic effects is provided. Overall the quality of the calibrated mean photometry in Gaia EDR3 is superior with respect to DR2 for all bands.2021A&A...649A...3Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/649/A3CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/A+A/649/A6 : Gaia Catalogue of Nearby Stars - GCNS (Gaia collaboration, 2021)J/A+A/649/A7 : MC structure and properties (Gaia Collaboration+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/649/A3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/649/A3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/649/A3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/649/A3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/649/A3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/649/A3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/649/A3/passbandG, G_BP_ anf G_RP_ passbands used to generate the magnitudes and astrophysical parameters included in Gaia EDR3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthnmem.wlfloatGPb? G transmissivity curve at the corresponding wavelength (1)magphot.mag;em.optdoublenullablee_GPb? Uncertainty on the G transmissivity curve (1)magstat.errordoublenullableBPPb? BP transmissivity curve at the corresponding wavelength (1)magphot.mag;em.opt.Bdoublenullablee_BPPb? Uncertainty on the BP transmissivity curve (1)magstat.errordoublenullableRPPb? RP transmissivity curve at the corresponding wavelength (1)magphot.mag;em.opt.Rdoublenullablee_RPPb? Uncertainty on the RP transmissivity curve (1)magstat.errordoublenullableJ/A+A/649/A3/zeroptG, G_BP_ and G_RP_ zero points used to generate the magnitudes and astrophysical parameters included in Gaia EDR3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGZpG band zero pointphot.mag;arith.zpdoublee_GZpG band zero point uncertaintystat.errordoubleBPZpG_BP_ band zero pointphot.mag;arith.zpdoublee_BPZpG_BP_ band zero point uncertaintystat.errordoubleRPZpG_RP_ band zero pointphot.mag;arith.zpdoublee_RPZpG_RP_ band zero point uncertaintystat.errordoubleSystem[VEGAMAG, AB] Photometric systemphotchar