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Gaia Data Release 3. Apsis. III. Non-stellar content and source classification

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dc.contributor.authorDelchambre, L.
dc.contributor.authorBailer Jones, C. A. L.
dc.contributor.authorBellas Velidis, I.
dc.contributor.authorDrimmel, R.
dc.contributor.authorGarabato, D.
dc.contributor.authorSarro Baro, Luis Manuel
dc.contributor.orcidhttps://orcid.org/0000-0003-2559-408X
dc.contributor.orcidhttps://orcid.org/0009-0004-7385-9198
dc.contributor.orcidhttps://orcid.org/0000-0002-1777-5502
dc.contributor.orcidhttps://orcid.org/0000-0002-7133-6623
dc.date.accessioned2024-06-04T14:09:31Z
dc.date.available2024-06-04T14:09:31Z
dc.date.issued2023-06-16
dc.descriptionThe registered version of this article, first published in Astronomy & Astrophysics (A&A), is available online at the publisher's website: EDP Sciences, https://doi.org/10.1051/0004-6361/202243423
dc.descriptionLa versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (A&A), está disponible en línea en el sitio web del editor: EDP Sciences, https://doi.org/10.1051/0004-6361/202243423
dc.description.abstractContext. As part of the third Gaia Data Release, we present the contributions of the non-stellar and classification modules from the eighth coordination unit (CU8) of the Data Processing and Analysis Consortium, which is responsible for the determination of source astrophysical parameters using Gaia data. This is the third in a series of three papers describing the work done within CU8 for this release. Aims. For each of the five relevant modules from CU8, we summarise their objectives, the methods they employ, their performance, and the results they produce for Gaia DR3. We further advise how to use these data products and highlight some limitations. Methods. The Discrete Source Classifier (DSC) module provides classification probabilities associated with five types of sources: quasars, galaxies, stars, white dwarfs, and physical binary stars. A subset of these sources are processed by the Outlier Analysis (OA) module, which performs an unsupervised clustering analysis, and then associates labels with the clusters to complement the DSC classification. The Quasi Stellar Object Classifier (QSOC) and the Unresolved Galaxy Classifier (UGC) determine the redshifts of the sources classified as quasar and galaxy by the DSC module. Finally, the Total Galactic Extinction (TGE) module uses the extinctions of individual stars determined by another CU8 module to determine the asymptotic extinction along all lines of sight for Galactic latitudes |b|> 5°. Results.Gaia DR3 includes 1591 million sources with DSC classifications; 56 million sources to which the OA clustering is applied; 1.4 million sources with redshift estimates from UGC; 6.4 million sources with QSOC redshift; and 3.1 million level 9 HEALPixes of size 0.013 deg2 where the extinction is evaluated by TGE. Conclusions. Validation shows that results are in good agreement with values from external catalogues; for example 90% of the QSOC redshifts have absolute error lower than 0.1 for sources with empty warning flags, while UGC redshifts have a mean error of 0.008 ± 0.037 if evaluated on a clean set of spectra. An internal validation of the OA results further shows that 30 million sources are located in high confidence regions of the clustering map.en
dc.description.versionversión publicada
dc.identifier.citationGaia Data Release 3 - Apsis. III. Non-stellar content and source classification L. Delchambre, C. A. L. Bailer-Jones, I. Bellas-Velidis, R. Drimmel, D. Garabato, R. Carballo, D. Hatzidimitriou, D. J. Marshall, R. Andrae, C. Dafonte, E. Livanou, M. Fouesneau, E. L. Licata, H. E. P. Lindstrøm, M. Manteiga, C. Robin, A. Silvelo, A. Abreu Aramburu, M. A. Álvarez, J. Bakker, A. Bijaoui, N. Brouillet, E. Brugaletta, A. Burlacu, L. Casamiquela, L. Chaoul, A. Chiavassa, G. Contursi, W. J. Cooper, O. L. Creevey, A. Dapergolas, P. de Laverny, C. Demouchy, T. E. Dharmawardena, B. Edvardsson, Y. Frémat, P. García-Lario, M. García-Torres, A. Gavel, A. Gomez, I. González-Santamaría, U. Heiter, A. Jean-Antoine Piccolo, M. Kontizas, G. Kordopatis, A. J. Korn, A. C. Lanzafame, Y. Lebreton, A. Lobel, A. Lorca, A. Magdaleno Romeo, F. Marocco, N. Mary, C. Nicolas, C. Ordenovic, F. Pailler, P. A. Palicio, L. Pallas-Quintela, C. Panem, B. Pichon, E. Poggio, A. Recio-Blanco, F. Riclet, J. Rybizki, R. Santoveña, L. M. Sarro, M. S. Schultheis, M. Segol, I. Slezak, R. L. Smart, R. Sordo, C. Soubiran, M. Süveges, F. Thévenin, G. Torralba Elipe, A. Ulla, E. Utrilla, A. Vallenari, E. van Dillen, H. Zhao and J. Zorec A&A, 674 (2023) A31 DOI: https://doi.org/10.1051/0004-6361/202243423
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202243423
dc.identifier.issn0004-6361 - eISSN 1432-0746
dc.identifier.urihttps://hdl.handle.net/20.500.14468/22264
dc.journal.titleAstronomy & Astrophysics (A&A)
dc.journal.volume674
dc.language.isoen
dc.publisherEDP Sciences
dc.relation.centerE.T.S. de Ingeniería Informática
dc.relation.departmentInteligencia Artificial
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject33 Ciencias Tecnológicas
dc.subject.keywordsmethods: data analysisen
dc.subject.keywordsmethods: statisticalen
dc.subject.keywordsGalaxy: fundamental parametersen
dc.subject.keywordsdust, extinctionen
dc.subject.keywordsquasars: generalen
dc.subject.keywordscatalogsen
dc.titleGaia Data Release 3. Apsis. III. Non-stellar content and source classificationen
dc.typejournal articleen
dc.typeartículoes
dspace.entity.typePublication
relation.isAuthorOfPublication9f881bbd-b55d-43bd-87b0-41f8f72cff48
relation.isAuthorOfPublication.latestForDiscovery9f881bbd-b55d-43bd-87b0-41f8f72cff48
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