Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..633g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, June 1978, p. 633-643.
Astronomy and Astrophysics
Astronomy
98
Emission Spectra, Galactic Clusters, Galactic Radiation, Line Spectra, Seyfert Galaxies, Statistical Distributions, Galactic Nuclei, Hydrogen Clouds, Light Emission, Markarian Galaxies, Spiral Galaxies
Scientific paper
A sample of optical spectra of 1316 galaxies collected from the literature is used to study the relative frequencies of emission-line galaxies inside and outside dense clusters. It is concluded that emission-line galaxies are indeed much less common in dense clusters than in less prominent associations or in the field and that this effect applies to spiral nuclei as well as to E and S0 galaxies. A number of possible selection effects are investigated, but it is found that none of them contributes substantially to the observed effect. Markarian galaxies apparently avoid dense clusters also and a similar, though very tentative, conclusion is reached for Seyfert galaxies.
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