000006082 001__ 6082
000006082 005__ 20240108164336.0
000006082 0247_ $$2DOI$$a10.1051/0004-6361/202243880
000006082 037__ $$aSCART-2023-0040
000006082 100__ $$aMontegriffo, P.
000006082 245__ $$aGaia Data Release 3: External calibration of BP/RP low-resolution spectroscopic data 
000006082 260__ $$c2023
000006082 520__ $$aContext. Gaia Data Release 3 contains astrometry and photometry results for about 1:8 billion sources based on observations collected by the European Space Agency (ESA) Gaia satellite during the first 34 months of its operational phase (the same period covered Gaia early Data Release 3; Gaia EDR3). Low-resolution spectra for 220 million sources are one of the important new data products included in this release. Aims. In this paper, we focus on the external calibration of low-resolution spectroscopic content, describing the input data, algorithms, data processing, and the validation of the results. Particular attention is given to the quality of the data and to a number of features that users may need to take into account to make the best use of the catalogue. Methods. We calibrated an instrument model to relate mean Gaia spectra to the corresponding spectral energy distributions (SEDs) using an extended set of calibrators: this includes modelling of the instrument dispersion relation, transmission, and line spread functions. Optimisation of the model is achieved through total least-squares regression, accounting for errors in Gaia and external spectra. Results. The resulting instrument model can be used for forward modelling of Gaia spectra or for inverse modelling of externally calibrated spectra in absolute flux units. Conclusions. The absolute calibration derived in this paper provides an essential ingredient for users of BP/RP spectra. It allows users to connect BP/RP spectra to absolute fluxes and physical wavelengths.
000006082 536__ $$aGaia PRODEX/$$cGaia PRODEX/$$fGaia PRODEX
000006082 594__ $$aNO
000006082 6531_ $$acatalogues
000006082 6531_ $$asurveys
000006082 6531_ $$ainstrumentation: photometers; spectrographs
000006082 6531_ $$atechniques: photometric; spectroscopy
000006082 700__ $$aDe Angeli, F.
000006082 700__ $$aAndrae, R.
000006082 700__ $$aRiello, M.
000006082 700__ $$aPancino, E.
000006082 700__ $$aSanna, N.
000006082 700__ $$aBellazzini, M.
000006082 700__ $$aEvans, D. W.
000006082 700__ $$aCarrasco, J. M.
000006082 700__ $$aSordo, R.
000006082 700__ $$aBusso, G.
000006082 700__ $$aCacciari, C.
000006082 700__ $$aJordi, C.
000006082 700__ $$avan Leeuwen, F.
000006082 700__ $$aVallenari, A.
000006082 700__ $$aAltavilla, G.
000006082 700__ $$aBarstow, M. A.
000006082 700__ $$aBrown, A. G. A.
000006082 700__ $$aBurgess, P. W.
000006082 700__ $$aCastellani, M.
000006082 700__ $$aCowell, S.
000006082 700__ $$aDavidson, M.
000006082 700__ $$aDe Luise, F.
000006082 700__ $$aDelchambre, L.
000006082 700__ $$aDiener, C.
000006082 700__ $$aFabricius, C.
000006082 700__ $$aFremat, Y.
000006082 700__ $$aFouesneau, M.
000006082 700__ $$aGilmore, G.
000006082 700__ $$aGiuffrida, G.
000006082 700__ $$aHambly, N. C.
000006082 700__ $$aHarrison, D. L.
000006082 700__ $$aHidalgo, S.
000006082 700__ $$aHodgkin, S. T.
000006082 700__ $$aHolland, G.
000006082 700__ $$aMarinoni, S.
000006082 700__ $$aOsborne, P. J.
000006082 700__ $$aPagani, C.
000006082 700__ $$aPalaversa, L.
000006082 700__ $$aPiersimoni, A. M.
000006082 700__ $$aPulone, L.
000006082 700__ $$aRagaini, S.
000006082 700__ $$aRainer, M.
000006082 700__ $$aRichards, P. J.
000006082 700__ $$aRowell, N.
000006082 700__ $$aRuz-Mieres, D.
000006082 700__ $$aSarro, L. M.
000006082 700__ $$aWalton, N. A.
000006082 700__ $$aYoldas, A.
000006082 773__ $$cA3 (33p)$$pAstronomy & Astrophysics$$v674
000006082 8560_ $$fronny.blomme@observatoire.be
000006082 85642 $$ahttps://ui.adsabs.harvard.edu/abs/2022arXiv220606205M/abstract
000006082 85642 $$ahttps://arxiv.org/abs/2206.06205
000006082 905__ $$apublished in
000006082 980__ $$aREFERD