Evidence for underlying galaxies in a complete sample of variable quasars

Details Evidence for underlying galaxies in a complete sample of variable quasars Evidence for underlying galaxies in a complete sample of variable quasars

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..241h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, May 15, 1985, p. 241-249.

Astronomy and Astrophysics

Astronomy

4

Galactic Structure, Periodic Variations, Quasars, Radiant Flux Density, Visible Spectrum, Color-Magnitude Diagram, Constraints, Galactic Nuclei, Interstellar Extinction, Samples

Scientific paper

A complete sample of quasars has been selected on the basis of optical variability. The objects are observed to become redder at faint magnitudes, both in the colour-magnitude diagram of the sample as a whole, and in the colour of individual objects as they vary. It is concluded that the faint end of the sample is dominated by low-luminosity objects, and the reddening is interpreted as being caused by the presence of an underlying red galaxy which progressively contaminates the integrated colour as the blue nuclear component becomes weaker. Some constraints on the nature of the underlying galaxy are discussed.

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