A near-infrared study of a homogeneous sample of optically selected active galactic nuclei. II - Analysis of the results and interpretation

Details A near-infrared study of a homogeneous sample of optically selected active galactic nuclei. II - Analysis of the results and interpretation A near-infrared study of a homogeneous sample of optically selected active galactic nuclei. II - Analysis of the results and interpretation

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399...38d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 38-49.

Astronomy and Astrophysics

Astronomy

35

Active Galactic Nuclei, Infrared Astronomy, Interacting Galaxies, Seyfert Galaxies, Spiral Galaxies, Astronomical Photometry, Emission Spectra, Galactic Evolution, Luminosity

Scientific paper

New imaging and photometric IR data have been used to discuss the properties of nuclei and hosting galaxies of a well-defined and large sample of optically selected Seyfert 1 galaxies. The K-band luminosity distribution of galaxies hosting the active nuclei has been derived, and the comparison with the local luminosity function of the spirals confirms that the probability of a spiral galaxy hosting bright AGNs increases with the luminosity. On average, the colors of the galaxies are slightly redder than those of spirals, suggesting that hosting galaxies usually have moderately enhanced star formation rates. The analysis of the correlation of the K band with IRAS fluxes demonstrates that the nuclei largely dominate the 12-micron emission, whereas the galaxies are the major contributors at wavelengths not less than 60 microns. It is shown that galaxies with spectral index between 12 and 60 microns flatter than -1.5 are likely hosting an active nucleus.

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