Type: Talk
Session: Stellar Science and Crowded Fields
Author: Oleksandra Razim

Abstract: LSST photometries for billions of stars will enable a multitude of research in the areas of astrophysics, stellar evolution and Milky Way structure and history. To prepare for this upcoming data, we created a catalogue of synthetic LSST photometries obtained from the low-resolution Gaia XP spectra and calibrated with the high-quality SDSS Stripe 82 data. The catalogue contains synthetic magnitudes for ~220 million sources, most of which have Gaia Gmag<17.5 The bias correction procedure that we developed for this catalogue reduces the median residual of the magnitudes to ~0.0001 for the griz bands and ~0.003 for the u band, which is one-two orders of magnitude better than the previous results. We envision that once the first LSST observations are available, we can use this correction procedure to combine observed and synthetic photometries to broaden the parameter range of the datasets and to convey astrophysical research with larger samples of objects.