Differences between Gaia DR2 and Gaia EDR3 photometry: demonstration, consequences, and applications

2024/07/31 by Apellániz, J. Maíz, Weiler, M.
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Solar and Stellar Astrophysics (astro-ph.SR)

paper · doi:10.48550/arxiv.2407.21388

Abstract

We produce a new photometric calibration for the combined six-filter system formed by Gaia DR2 + EDR3 G+G_{\rm BP}+G_{\rm RP} using an improved STIS/HST spectrophotometric library with very red stars. The comparison between observed and synthetic photometry yields residual dispersions of just 3.4-8.7 mmag, resulting in the most accurate and precise whole-sky large-dynamic-range optical photometric system ever obtained. We include some tests and applications.

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