Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..261g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 194, Jan. 1981, p. 261-274.
Astronomy and Astrophysics
Astronomy
4
Elliptical Galaxies, Emission Spectra, Galactic Clusters, Line Spectra, Radio Galaxies, Cross Correlation, Ionized Gases, Red Shift, Sky Surveys (Astronomy), Spectral Correlation, Star Distribution
Scientific paper
Samples of elliptical radio galaxies which are within or remote from rich clusters of galaxies were compiled by examining the fields of 190 radio galaxies with known redshifts on copies of Schmidt Sky Survey plates. The optical spectra of the radio galaxies were classified according to emission-line strengths. The two samples were compared with regard to emission-line strengths and other properties. An anticorrelation was found between the emission-line strengths and cluster membership of radio galaxies with luminosities at 408 MHz in the range 10 to the 24th to 10 to the 26th W/Hz. Various interpretations of this result are discussed; these include gas removal mechanisms which may operate preferentially in clusters and the possibility that isolated radio galaxies are very massive and contain extensive gaseous atmospheres by gravitation. Optical emission lines may occur more frequently among cD and other centrally located radio galaxies in clusters than among less central radio galaxies in clusters. There is also a lack of emission lines among galaxies associated with old radio sources in clusters having steep low-frequency spectra.
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