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Gaia Data Release 3. External calibration of BP/RP low-resolution spectroscopic data

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dc.contributor.authorMontegriffo, P.
dc.contributor.authorAngeli, Francesca De
dc.contributor.authorAndrae, Rene
dc.contributor.authorRiello, Marco
dc.contributor.authorPancino, Elena
dc.contributor.authorSarro Baro, Luis Manuel
dc.contributor.orcidhttps://orcid.org/0000-0001-5013-5948
dc.contributor.orcidhttps://orcid.org/0000-0003-1879-0488
dc.contributor.orcidhttps://orcid.org/0000-0001-8006-6365
dc.contributor.orcidhttps://orcid.org/0000-0002-3134-0935
dc.contributor.orcidhttps://orcid.org/0000-0003-0788-5879
dc.date.accessioned2024-06-03T16:14:05Z
dc.date.available2024-06-03T16:14:05Z
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: EDITOR, https://doi.org/10.1051/0004-6361/202243880
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/10.1051/0004-6361/202243880
dc.description.abstractContext.Gaia Data Release 3 contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the European Space Agency (ESA) Gaia satellite during the first 34 months of its operational phase (the same period covered by Gaia early Data Release 3; Gaia EDR3). Low-resolution spectra for 220 million sources are one of the important new data products included in this release. Aims. In this paper, we focus on the external calibration of low-resolution spectroscopic content, describing the input data, algorithms, data 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 catalogue. Methods. We calibrated an instrument model to relate mean Gaia spectra to the corresponding spectral energy distributions (SEDs) using an extended set of calibrators: this includes modelling of the instrument dispersion relation, transmission, and line spread functions. Optimisation of the model is achieved through total least-squares regression, accounting for errors in Gaia and external spectra. Results. The resulting instrument model can be used for forward modelling of Gaia spectra or for inverse modelling of externally calibrated spectra in absolute flux units. Conclusions. The absolute calibration derived in this paper provides an essential ingredient for users of BP/RP spectra. It allows users to connect BP/RP spectra to absolute fluxes and physical wavelengths.en
dc.description.versionversión publicada
dc.identifier.citationGaia Data Release 3 - External calibration of BP/RP low-resolution spectroscopic data P. Montegriffo, F. De Angeli, R. Andrae, M. Riello, E. Pancino, N. Sanna, M. Bellazzini, D. W. Evans, J. M. Carrasco, R. Sordo, G. Busso, C. Cacciari, C. Jordi, F. van Leeuwen, A. Vallenari, G. Altavilla, M. A. Barstow, A. G. A. Brown, P. W. Burgess, M. Castellani, S. Cowell, M. Davidson, F. De Luise, L. Delchambre, C. Diener, C. Fabricius, Y. Frémat, M. Fouesneau, G. Gilmore, G. Giuffrida, N. C. Hambly, D. L. Harrison, S. Hidalgo, S. T. Hodgkin, G. Holland, S. Marinoni, P. J. Osborne, C. Pagani, L. Palaversa, A. M. Piersimoni, L. Pulone, S. Ragaini, M. Rainer, P. J. Richards, N. Rowell, D. Ruz-Mieres, L. M. Sarro, N. A. Walton and A. Yoldas A&A, 674 (2023) A3 DOI: https://doi.org/10.1051/0004-6361/202243880
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202243880
dc.identifier.issn0004-6361 - eISSN 1432-0746
dc.identifier.urihttps://hdl.handle.net/20.500.14468/22260
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.keywordscatalogsen
dc.subject.keywordssurveysen
dc.subject.keywordsinstrumentation: photometersen
dc.subject.keywordsinstrumentation: spectrographsen
dc.subject.keywordstechniques: photometricen
dc.subject.keywordstechniques: spectroscopicen
dc.titleGaia Data Release 3. External calibration of BP/RP low-resolution spectroscopic dataes
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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