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Correlations between Environmental Parameters and Nuclear Activity

Published online by Cambridge University Press:  12 April 2016

W. Kollatschny  and
K.J. Fricke
W. Kollatschny
Affiliation:
Universitáts-Sternwarte, D-3400 Göttingen, F.R.G
K.J. Fricke
Affiliation:
Universitáts-Sternwarte, D-3400 Göttingen, F.R.G

Extract

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The occurrence and quantitative properties of Seyfert 1 and Seyfert 2 galaxies as a function of the galaxy environment have been studied in a systematic way. For this investigation we have selected from the Catalogue of Quasars and Active Nuclei (Veron & Veron, 1989) all Seyfert galaxies with the following properties:

(i) mV ≤ 15,

(ii) listed classification as Sey 1, Sey 2, or Sey 3,

(iii) vrad ≤ 20000 km s-1.

This results in a sample size of 242 Seyfert galaxies. For all these objects their galaxy environment has been inspected on POSS and ESO/SRC plates.

The vicinity of each sample Seyfert galaxy was searched for companion galaxies out to at least 0.5 Mpc. Lacking redshift information we adopted as a companion galaxy any galaxy in this area having a size between 20 and 200 percent of the Seyfert galaxy size.

Type
V. Observations of Nuclear and Near-Nuclear Activity
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 437 - 440
Copyright
Copyright © NASA 1990

References

Kollatschny, W., Fricke, K.J., 1989: Astron. Astrophys. 219, 34 Google Scholar
Veron-Cetty, M.-P., Veron, P., 1989: A Catalogue of Quasars and Active Galactic Nuclei (4th Edition), ESO Scientific Report No. 7 Google Scholar