Optical line-emitting gas and radio emission - Evidence for correlation in low-luminosity radio galaxies

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Extraterrestrial Radiation, H Alpha Line, Luminous Intensity, Narrowband, Radio Emission, Radio Galaxies, Active Galactic Nuclei, Astronomical Photography, Astronomical Photometry, Bl Lacertae Objects, Emission Spectra, Luminosity, Nitrogen, Spectral Line Width

Scientific paper

Narrow-band H-alpha + (N II) images of a sample of low-luminosity B2 radio sources are used to investigate the correlations between radio and optical emission-line properties. It is shown that the correlation between radio and emission-line luminosity - previously established for high-power radio galaxies - extends over five decades in radio luminosity and includes the low-radio power sources. The compact radio sources have emission-line excesses relative to the other sources in the sample of the same radio power, as well as far-IR emission characteristics of emission from cool dust. Although continuity arguments can be used to show that the ionized gas in most of the low-luminosity sources is likely to be photoionized by the Active Galactic Nucleus, it is possible that additional ionizing sources contribute in the compact, emission-line excess objects. A program of detailed spectroscopic observations is required to investigate the underlying physical mechanisms.

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