Incidence of ionised gas in E/S0 radio galaxies

Details Incidence of ionised gas in E/S0 radio galaxies Incidence of ionised gas in E/S0 radio galaxies

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..374o&link_type=abstract

Nature, vol. 276, Nov. 23, 1978, p. 374, 375.

Mathematics

Probability

32

Astronomical Models, Elliptical Galaxies, Extragalactic Radio Sources, Interstellar Gas, Ionized Gases, Spectrophotometry, Spiral Galaxies, Astronomical Photometry, Emission Spectra, Hydrogen Clouds, Radio Galaxies, Seyfert Galaxies, Spectral Energy Distribution

Scientific paper

Spectrophotometry of 57 E/S0 sources was obtained, and the data are presented in the form of the equivalent width of the O II forbidden line at 3727 A plotted against a radio-optical flux ratio. Most of the compact objects had strong equivalent width of this line, whereas only a fraction of the extended objects were detected. It is suggested that compact objects have a high probability of strong forbidden O II line emission. To explain this result, it is proposed that since compact radio sources require replenishment of relativistic electrons on a much shorter time scale than extended sources, there must be an infall of thermal gas onto a condensed nuclear object to produce a relativistic plasma.

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