Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293..683l&link_type=abstract
Astronomy and Astrophysics 293, 683-702 (1995)
Astronomy and Astrophysics
Astrophysics
68
Galaxies: Clustering, Interactions, Seyfert
Scientific paper
Environments of 104 Seyferts and 138 comparison galaxies have been analyzed based on measurements on the Palomar Sky Survey plates. Our basic idea was to have large enough measuring circles to enable good elimination of background galaxies and to compare the environments of Seyfert 1 and 2 galaxies. Seyferts were also compared with normal galaxies. The Seyferts were found to have on the average about two times more companions than the control galaxies. The satellites are concentrated mainly around late-type and non-compact peculiar Seyfert 2 galaxies, which may each have several companions. On the other hand, Seyfert 1 galaxies of all morphological types have on the average the same number of companions as normal galaxies. Seyferts as a whole do not appear in interacting systems more frequently than normal galaxies (Dahari-type tests) giving further evidence that the satellites are concentrated around a few objects only. Of type 2 Seyferts only peculiar galaxies are preferentially in interacting systems, whereas type 1 Seyfert neighbourhoods are normal or even deficient of companions. The difference in the environments of Seyfert 1 and Seyferts 2 galaxies disagrees with the Unified Model of AGN's according to which these two Seyferts types should represent similar objects seen from different viewing angles. While comparing Seyferts with normal galaxies our conclusions disagree with the previous studies as shown in the discussion. However, the apparent incompatibilites of the results in different works can be understood on the basis of morphological sample selection, problems in background galaxy elimination or bias in redshift between the compared samples. Particularly we tested the methods by Dahari (1984) and Fuentes-Williams & Stocke (1988).
Laurikainen Eija
Salo Heikki
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