Publicación: Gaia Data Release 3. Apsis. III. Non-stellar content and source classification
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Fecha
2023-06-16
Autores
Delchambre, L.
Bailer Jones, C. A. L.
Bellas Velidis, I.
Drimmel, R.
Garabato, D.
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Derechos de acceso
info:eu-repo/semantics/openAccess
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Editor
EDP Sciences
Resumen
Context. 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.
Descripción
The 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
La 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
La 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
Categorías UNESCO
Palabras clave
methods: data analysis, methods: statistical, Galaxy: fundamental parameters, dust, extinction, quasars: general, catalogs
Citación
Gaia 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
Centro
E.T.S. de Ingeniería Informática
Departamento
Inteligencia Artificial