NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-07-19 T00:16:30 PDT
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For refcode 2007MNRAS.382.1552L:
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Copyright by Royal Astronomical Society. 2007MNRAS.382.1552L Multiwavelength study of the nuclei of a volume-limited sample of galaxies - II. Optical, infrared and radio observations P. Lira, R. A. Johnson, A. Lawrence and R. Cid Fernandes Abstract. 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 M_B_ ~ -12 to -22 range. Key words: galaxies: active, galaxies: general, galaxies: nuclei
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