RT journal article
T1 Gaia Data Release 3: The Galaxy in your preferred colours: Synthetic photometry from Gaia low-resolution spectra
A1 Montegriffo, P.
A1 Bellazzini, M.
A1 De Angel, F.
A1 Andrae, R.
A1 Barstow, M. A.
A1 Berihuete Macías, Ángel
A2 Estadística e Investigación Operativa
K1 catalogs
K1 surveys
K1 techniques: photometric
K1 techniques: spectroscopic
K1 stars: general
K1 Galaxy: general
AB Gaia Data Release 3 provides novel flux-calibrated low-resolution spectrophotometry for '220 million sources in the wavelength range330 nm ≤ λ ≤ 1050 nm (XP spectra). Synthetic photometry directly tied to a flux in physical units can be obtained from these spectra for anypassband fully enclosed in this wavelength range. We describe how synthetic photometry can be obtained from XP spectra, illustrating the performance that can be achieved under a range of different conditions – for example passband width and wavelength range – as well as the limits andthe problems affecting it. Existing top-quality photometry can be reproduced within a few per cent over a wide range of magnitudes and colour,for wide and medium bands, and with up to millimag accuracy when synthetic photometry is standardised with respect to these external sources.Some examples of potential scientific application are presented, including the detection of multiple populations in globular clusters, the estimationof metallicity extended to the very metal-poor regime, and the classification of white dwarfs. A catalogue providing standardised photometry for'2.2×108sources in several wide bands of widely used photometric systems is provided (Gaia Synthetic Photometry Catalogue; GSPC) as well asa catalogue of '105 white dwarfs with DA/non-DA classification obtained with a Random Forest algorithm (Gaia Synthetic Photometry Cataloguefor White Dwarfs; GSPC-WD).
PB EDP Sciences
SN 1432-0746
YR 2023
FD 2023
LK http://hdl.handle.net/10498/31690
UL http://hdl.handle.net/10498/31690
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026