The Construction of the Large Quasar Astrometric Catalogue (LQAC)

Details The Construction of the Large Quasar Astrometric Catalogue (LQAC) The Construction of the Large Quasar Astrometric Catalogue (LQAC)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..434..197b&link_type=abstract

Astronomical Data Analysis Software and Systems XIX. Proceedings of a conference held October 4-8, 2009 in Sapporo, Japan. Edite

Astronomy and Astrophysics

Astronomy

Scientific paper

We have gathered the 12 largest quasar catalogues (4 from radio interferometry programs, 8 from optical survey) and we have carried out systematic cross-identifications of the objects to obtain their best position estimates together with providing physical information at both optical and radio wavelengths. Our catalogue compilation designated as the LQAC (Large Quasar Astrometric Catalogue), gives equatorial coordinates of 113 666 quasars with magnitudes at 9 bandwidths, 5 radio fluxes, the redshift and the absolute magnitude (when the information is available). We made use of VO tools like Aladin for preliminary studies. For cross identification, data processing and validation, we made use of two different software packages with the same parameters and strategy: VO Topcat with Stilits. Our results were checked with homemade Fortran programs.

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