TL;DR
This paper introduces the Half Million Quasars (HMQ) Catalogue, a comprehensive database of over 510,000 quasars and related objects with detailed astrometric and photometric data, including new spectroscopic confirmations.
Contribution
It provides the largest and most complete quasar catalogue to date, combining literature data with new spectroscopic confirmations and multi-wavelength associations.
Findings
Contains 510,764 objects including quasars, AGN, and BL Lac objects.
Includes 114 newly spectroscopically confirmed quasars.
Provides detailed astrometry, photometry, redshifts, and associations.
Abstract
A quasar catalogue is presented with a total of 510764 objects including 424748 type 1 QSOs and 26623 type 1 AGN complete from the literature to 25 January 2015. Also included are 25015 high-confidence SDSS-based photometric quasars with radio/X-ray associations, 1595 BL Lac objects, and 32783 type 2 objects. Each object is displayed with arcsecond-accurate astrometry, red and blue photometry, redshift, citations, and radio and X-ray associations where present. Also, 114 new spectroscopically confirmed quasars are presented.
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