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The Million Quasars (Milliquas) v7.2 Catalogue, now with VLASS associations. The inclusion of SDSS-DR16Q quasars is detailed

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arxiv 2105.12985 v1 pith:UZ4COBLR submitted 2021-05-27 astro-ph.GA

Eric Wim Flesch This is my paper · ORCID
classification astro-ph.GA
keywords quasarscatalogueassociationsincludingradiosdsssdss-dr16qavailable
verification ladder T0 review T1 audit T2 compute T3 formal
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Announcing the release v7.2 of the Milliquas (Million Quasars) catalogue which presents all published quasars to 30 April 2021, including VLASS radio associations for the first time, and concluding the audit of quasars from SDSS-DR16Q and earlier SDSS releases. The totals are 829666 classified type-I QSOs/AGN, 703348 quasar candidates of 60%-100% pQSO, plus type-II objects and blazars which bring the total count to 1573824. Radio and/or X-ray associations, including probable double radio lobes, are shown for 333638 entries. Gaia-DR2 astrometry is given for most objects, as available. The catalogue is available on multiple sites. The inclusion of the SDSS-DR16Q quasars was a complex task with emergent issues which resulted in 13443 DR16Q entries being dropped, 1.79% of their total. There are also 1701 quasars included from earlier visual SDSS releases, as well as 14232 quasars from the SDSS-DR16 pipeline catalogue. All these are explained here, including the validation of 677 additional high-redshift (z>=3.5) SDSS quasars which were not included in DR16Q.

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