The Million Quasars (Milliquas) v8 catalog  --  Final Edition  --  2023,OJAp,6,49

MILLIQUAS v8 includes quasars from the literature to 30 June 2023, including quasars from the DESI-EDR and SDSS-DR18Q.  This edition includes 907K type-I QSOs & AGN, plus blazars and type-II objects and 66K radio/X-ray associated QSO candidates of pQSO=99%, for a total count of 1,021,800 -- details are in the ReadMe.  Gaia-EDR3 astrometry is given for ~60% of the objects, as available.  This is the final edition of Milliquas -- published by the Open Journal of Astrophysics -- 2023,OJAp,6,49 -- https://doi.org/10.21105/astro.2308.01505.   

Here is the ReadMe, and a quick browse of sample data (in flat text form) is here.


GET MILLIQUAS v8  HERE  (31 MB zipped).  Also available in FITS (40 MB zipped).  Or get them from CDS here (select FTP tab).


Citations in Milliquas are indexed in the file "milliquas-references.txt" here.  

Get the paper here (vanilla style)  or on  arXiv  or on  OJAp.
  

A previous paper for Milliquas v7.2 is here and also on arXiv -- it details the inclusion of SDSS quasars up through DR-16Q.   

An earlier paper for Milliquas v6.4 is here and on arXiv .  It gives some history and informal context.      


Milliquas used to be published with many more radio/X-ray associated optical candidates over the whole sky -- these are now presented by the MORX v2 catalog (2024,OJAp,7,6 -- https://doi.org/10.21105/astro.2308.01507) which consists of 3,115,575 radio/X-ray associated quasars, galaxies, stars, and unclassifieds with > 500K high-probability quasar candidates.  Paper for MORXv2 is here or on arXiv .           

MORX v2 is HERE (143 MB zipped).  Also available in FITS (168 MB zipped).  Or get them from CDS here  (select FTP tab).

MORX ReadMe is here .  Index to MORX citations is here .  


 

Eric Flesch, last updated 19 February 2024