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

Astronomy and Astrophysics 2023年 674卷

作者： Delchambre, L. Bailer-Jones, C.A.L. Bellas-Velidis, I. Drimmel, R. Garabato, D. Carballo, R. Hatzidimitriou, D. Marshall, D.J. Andrae, R. Dafonte, C. Livanou, E. Fouesneau, M. Licata, E.L. Lindstrøm, H.E.P. Manteiga, M. Robin, C. Silvelo, A. Abreu Aramburu, A. Álvarez, M.A. Bakker, J. Bijaoui, A. Brouillet, N. Brugaletta, E. Burlacu, A. Casamiquela, L. Chaoul, L. Chiavassa, A. Contursi, G. Cooper, W.J. Creevey, O.L. Dapergolas, A. De Laverny, P. Demouchy, C. Dharmawardena, T.E. Edvardsson, B. Frémat, Y. García-Lario, P. García-Torres, M. Gavel, A. Gomez, A. González-Santamaría, I. Heiter, U. Jean-Antoine Piccolo, A. Kontizas, M. Kordopatis, G. Korn, A.J. Lanzafame, A.C. Lebreton, Y. Lobel, A. Lorca, A. Magdaleno Romeo, A. Marocco, F. Mary, N. Nicolas, C. Ordenovic, C. Pailler, F. Palicio, P.A. Pallas-Quintela, L. Panem, C. Pichon, B. Poggio, E. Recio-Blanco, A. Riclet, F. Rybizki, J. Santoveña, R. Sarro, L.M. Schultheis, M.S. Segol, M. Slezak, I. Smart, R.L. Sordo, R. Soubiran, C. Süveges, M. Thévenin, F. Torralba Elipe, G. Ulla, A. Utrilla, E. Vallenari, A. Van Dillen, E. Zhao, H. Zorec, J. Institut D Astrophysique et de Géophysique Université de Liège 19c Allée du 6 Août Liège4000 Belgium Max Planck Institute for Astronomy Königstuhl 17 Heidelberg69117 Germany National Observatory of Athens I. Metaxa and Vas. Pavlou Palaia Penteli Athens15236 Greece INAF Osservatorio Astrofisico di Torino Via Osservatorio 20 TO Pino Torinese10025 Italy CIGUS CITIC Department of Computer Science and Information Technologies University of A Coruña Campus de Elviña s/n A Coruña15071 Spain Dpto. de Matemática Aplicada y Ciencias de la Computación Univ. de Cantabria ETS Ingenieros de Caminos Canales y Puertos Avda. de los Castros s/n Santander39005 Spain Department of Astrophysics Astronomy and Mechanics National and Kapodistrian University of Athens Panepistimiopolis Zografos Athens15783 Greece IRAP Université de Toulouse CNRS UPS CNES 9 Av. colonel Roche BP 44346 ToulouseCedex 4 31028 France Niels Bohr Institute University of Copenhagen Juliane Maries Vej 30 Copenhagen2100 Denmark DXC Technology Retortvej 8 Valby2500 Denmark CIGUS CITIC Department of Nautical Sciences and Marine Engineering University of A Coruña Paseo de Ronda 51 A Coruña15071 Spain Thales Services for CNES Centre Spatial de Toulouse 18 avenue Edouard Belin ToulouseCedex 9 31401 France Camino bajo del Castillo s/n Urbanizacion Villafranca del Castillo Villanueva de la Cañada Madrid28692 Spain Université Côte D Azur Observatoire de la Côte D Azur CNRS Laboratoire Lagrange Bd de l Observatoire CS 34229 NiceCedex 4 06304 France Laboratoire D Astrophysique de Bordeaux Univ. Bordeaux CNRS B18N allée Geoffroy Saint-Hilaire Pessac33615 France INAF Osservatorio Astrofisico di Catania Via S. Sofia 78 Catania95123 Italy Telespazio for CNES Centre Spatial de Toulouse 18 avenue Edouard Belin ToulouseCedex 9 31401 France GEPI Observatoire de Paris Université PSL CNRS 5 place Jules Janssen Meudon92190 France CNES Centre Spatial de Toulouse 18 avenue Edouard B

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. *** 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 deg2where 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

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Research on factors affecting the operational reliability of water and sewer utility networks

引用

IOP Conference Series: Materials science and Engineering 2019年第1期708卷

作者： O V Starkova A I Aleinikova Y V Kolomiiets Department of Computer Science and Information Technology Kharkiv National University of Construction and Architecture Sumskaya st. 40 61002 Kharkiv Ukraine Department of building technology Kharkiv National University of Construction and Architecture Sumskaya st. 40 61002 Kharkiv Ukraine

Factors affecting the operational life of the water supply and sewer utility networks have been investigated. A method has been proposed for identifying the main factors affecting the operational reliability of distri...

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