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Gaia Data Release 3: The extragalactic content
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arxiv 2206.05681 v1 pith:5YRKTIAP submitted 2022-06-12 astro-ph.GA
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The Gaia Galactic survey mission is designed and optimized to obtain astrometry, photometry, and spectroscopy of nearly two billion stars in our Galaxy. Yet as an all-sky multi-epoch survey, Gaia also observes several million extragalactic objects down to a magnitude of G~21 mag. Due to the nature of the Gaia onboard selection algorithms, these are mostly point-source-like objects. Using data provided by the satellite, we have identified quasar and galaxy candidates via supervised machine learning methods, and estimate their redshifts using the low resolution BP/RP spectra. We further characterise the surface brightness profiles of host galaxies of quasars and of galaxies from pre-defined input lists. Here we give an overview of the processing of extragalactic objects, describe the data products in Gaia DR3, and analyse their properties. Two integrated tables contain the main results for a high completeness, but low purity (50-70%), set of 6.6 million candidate quasars and 4.8 million candidate galaxies. We provide queries that select purer sub-samples of these containing 1.9 million probable quasars and 2.9 million probable galaxies (both 95% purity). We also use high quality BP/RP spectra of 43 thousand high probability quasars over the redshift range 0.05-4.36 to construct a composite quasar spectrum spanning restframe wavelengths from 72-100 nm.
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Cited by 3 Pith papers
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Axial Bianchi IX meets Gaia data
astro-ph.CO 2026-08 conditional novelty 6.0 of 10
In axial Bianchi IX universes with dust and a cosmological constant, the linearized cosmic drift equals that of axial Bianchi I, so curvature drops out of the drift at first order.
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Deep Photometric and Astrometric Investigation of the Non-relaxed Star Cluster Stock 3 using Gaia DR3
astro-ph.SR 2025-01 conditional novelty 4.0 of 10
From Gaia DR3 proper motions and photometry, Stock 3 is found to be a 16-million-year-old open cluster at about 2.9 to 3.2 kiloparsecs, with an IMF slope close to the Salpeter value.
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Spectroscopic redshifts of selected flat-spectrum radio sources I
astro-ph.CO 2026-07 accept novelty 3.5 of 10
New spectroscopic redshifts are reported for six of fifteen bright SMILE flat-spectrum radio sources observed with the Skinakas 1.3 m telescope.
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