Multiwavelength study of the nuclei of a volume-limited sample of galaxies - II. Optical, infrared and radio observations

Details Multiwavelength study of the nuclei of a volume-limited sample of galaxies - II. Optical, infrared and radio observations Multiwavelength study of the nuclei of a volume-limited sample of galaxies - II. Optical, infrared and radio observations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.382.1552l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 382, Issue 4, pp. 1552-1590.

Astronomy and Astrophysics

Astronomy

2

Galaxies: Active, Galaxies: General, Galaxies: Nuclei

Scientific paper

We present optical and infrared broad-band images, radio maps, and optical spectroscopy for the nuclear region of a sample of nearby galaxies. The galaxies have been drawn from a complete volume-limited sample for which we have already presented X-ray imaging. We modelled the stellar component of the spectroscopic observations to determine the star formation history of our targets. Diagnostic diagrams were used to classify the emission-line spectra and determine the ionizing mechanism driving the nuclear regions. All those sources classified as active galactic nuclei present small Eddington ratios (~10-3 -10-6), implying a very slow growth rate of their black holes. We finally investigate the relative numbers of active and normal nuclei as a function of host galaxy luminosity and find that the fraction of active galaxies slowly rises as a function of host absolute magnitude in the MB ~ -12 to -22 range.

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