Note: This is a "live" catalog of quasars and quasar candidates. The published version is the Half Million Quasars catalog (HMQ: 2015, PASA 32, 10) which excludes candidates. The HMQ page is here -- has FITS file also.
MILLIQUAS v4.6 includes the HMQ catalog (see attribution above), SDSS-DR12 and SDSS-DR12Q (http://sdss.org/dr12) and NED / SIMBAD sourced quasar data up to November 2015. 880,540 SDSS-based photometric quasar candidates are also included, and 25,473 radio/X-ray associated candidates. Radio and/or X-ray identifications are shown where applicable, plus, for the candidates, the probability of each being a true quasar. The threshold for inclusion of candidates is 90% QSO-likelihood.
Quick browse of (flat text) data here , and here is the ReadMe
Get the 40 Mb file here .
The Atlas of Radio/X-ray Associations (ARXA, 2010 PASA, 27, 283) is here.
Eric Flesch, last updated 30 November 2015