VizieR Online Data Catalog: Kohonen-selected unusual SDSS quasars (Meusinger+, 2012)

We present a catalogue of 1005 quasars with unusual spectra in the redshift interval from 0.6 to 4.3. The quasars were selected from the Sloan Digital Sky Survey Data Release 7 (Abazajan+, 2009ApJS..182..543A) by means of Kohonen self-organising maps. The spectra are dominated by either broad absorption lines (42%), unusual red continua (27%), weak emission lines (18%), or conspicuously strong optical and/or UV iron emission (11%). This large sample provides a useful resource for both studying properties and relations of/between different types of unusual quasars and selecting particularly interesting objects, even though the compilation is not aimed at completeness in a quantifiable sense. The spectra are grouped into seven types. The catalogue contains the redshift, the absolute magnitude, the spectral type, the radio loudness parameter, a peculiarity index, and some comments on peculiar spectral features.

(1 data file).