Other
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..546m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 15, 1992, p. 546-562.
Other
56
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.
Morganti Rafaella
Tadhunter Clive N.
Ulrich Marie-Helene
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