2023A&A...674A...3M

Query : 2023A&A...674A...3M

2023A&A...674A...3M - Astronomy and Astrophysics, volume 674A3 (2023/6-1)

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

MONTEGRIFFO P., DE ANGELI F., ANDRAE R., RIELLO M., PANCINO E., SANNA N., BELLAZZINI M., EVANS D.W., CARRASCO J.M., SORDO R., BUSSO G., CACCIARI C., JORDI C., VAN LEEUWEN F., VALLENARI A., ALTAVILLA G., BARSTOW M.A., BROWN A.G.A., BURGESS P.W., CASTELLANI M., COWELL S., DAVIDSON M., DE LUISE F., DELCHAMBRE L., DIENER C., FABRICIUS C., FREMAT Y., FOUESNEAU M., GILMORE G., GIUFFRIDA G., HAMBLY N.C., HARRISON D.L., HIDALGO S., HODGKIN S.T., HOLLAND G., MARINONI S., OSBORNE P.J., PAGANI C., PALAVERSA L., PIERSIMONI A.M., PULONE L., RAGAINI S., RAINER M., RICHARDS P.J., ROWELL N., RUZ-MIERES D., SARRO L.M., WALTON N.A. and YOLDAS A.

Abstract (from CDS):

Context.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.

Abstract Copyright: © The Authors 2023

Journal keyword(s): catalogs - surveys - instrumentation: photometers - instrumentation: spectrographs - techniques: photometric - techniques: spectroscopic

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [PS72] 224 WD* 00 21 30.7252292376 -26 26 11.396435532   14.50 13.81 13.75   DA 14 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 QSO J1204+2754 Bla 12 04 42.1097215992 +27 54 11.869350264   15.64 15.60     ~ 429 0
4 GSPC P177-D * 15 59 13.5786527568 +47 36 41.906773080   14.17 13.52 13.42   G0 54 0
5 2MASS J16312509+1748101 QSO 16 31 25.1070902832 +17 48 10.077768792   18.35 17.93     ~ 23 0
6 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 457 0
7 BD+60 1753 * 17 24 52.2753625128 +60 25 50.749843296   9.72 9.65     A1V 42 0
8 TYC 4207-219-1 * 17 40 34.6786967328 +65 27 14.781864924   12.95 12.12     A6V 15 0
9 HD 163466 * 17 52 25.3741156656 +60 23 46.938537132   7.04 6.85     A2 61 0
10 * 13 Lyr LP* 18 55 20.1023376286 +43 56 45.922489780 7.00 5.59 4.00 1.95 0.04 M4.5III 324 1
11 * gam Cyg V* 20 22 13.7018357 +40 15 24.044963 3.44 2.90 2.23 1.74 1.40 F8Ib 607 0

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