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

Delchambre, L., Bailer-Jones, C.A.L., Bellas-Velidis, I. y Sarro Baro, Luis Manuel . (2023) Gaia Data Release 3. Non-stellar content and source classification. Astronomy & Astrophysics Vol 674, A31

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Título Gaia Data Release 3. Non-stellar content and source classification
Autor(es) Delchambre, L.
Bailer-Jones, C.A.L.
Bellas-Velidis, I.
Sarro Baro, Luis Manuel
Materia(s) Ingeniería Informática
Abstract Context. As part of the third Gaia Data Release, we present the contributions of the non-stellar and classifcation 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 Classier (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 classfication. The Quasi Stellar Object Classifier (QSOC) and the Unresolved Galaxy Classfier (UGC) determine the redshifts of the sources classfied 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 classications; 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.
Palabras clave methods
data analysis
methods: statistical
Galaxy: fundamental parameters
dust, extinction
quasars: general
catalogs
Editor(es) EDP Sciences
Fecha 2023-06-16
Formato application/pdf
Identificador bibliuned:95-Lmsarro-0013
http://e-spacio.uned.es/fez/view/bibliuned:95-Lmsarro-0013
DOI - identifier https://doi.org/10.1051/0004-6361/202243423
ISSN - identifier 1432-0746
Nombre de la revista Astronomy & Astrophysics (A&A)
Número de Volumen 674
Número de Issue A31
Publicado en la Revista Astronomy & Astrophysics Vol 674, A31
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (2023) Vol. 674, A31, está disponible en línea en el sitio web del editor: EDP Sciences, https://doi.org/10.1051/0004-6361/202243423
Notas adicionales The registered version of this paper, first published in Astronomy & Astrophysics (2023) Vol.674, A31, is available online at the publisher's website: EDP Sciences, https://doi.org/10.1051/0004-6361/202243423

 
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Creado: Tue, 12 Mar 2024, 21:42:01 CET