The nature of red active galactic nuclei in X-ray selected samples

Details The nature of red active galactic nuclei in X-ray selected samples The nature of red active galactic nuclei in X-ray selected samples

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343...66k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 66-77.

Astronomy and Astrophysics

Astrophysics

9

Active Galactic Nuclei, Astronomical Photometry, Spectrum Analysis, X Ray Sources, Luminosity, Radio Spectra, Red Shift, Spectral Energy Distribution

Scientific paper

BVRI photmetry of a sample of X-ray selected AGNs is examined to determine the cause of the red colors of low-luminosity objects in such samples. It is found that the redness is generally due to the presence of an underlying galaxy and not due to reddening by dust. The B-I color of each object is used to determine the mixing fraction of galaxy light. The contamination of galaxy light is removed to produce corrected values of the optical spectra index for each object. These corrected values show that the variation of the optical spectra index with luminosity observed in optically selected AGNs is also present in X-ray selected AGNs.

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