Issue |
Astron. Astrophys. Suppl. Ser.
Volume 132, Number 2, October II 1998
|
|
---|---|---|
Page(s) | 197 - 210 | |
DOI | https://doi.org/10.1051/aas:1998444 | |
Published online | 15 October 1998 |
Optical colour maps of Seyfert galaxies*
II. More Seyfert 2s
1
International School for Advanced Studies (SISSA), via Beirut 2–4, I–34014 Trieste, Italy
2
Tuorla Observatory, University of Turku, Väisäläntie 20, FIN–21500 Piikkiö, Finland
Send offprint request to: J.K. Kotilainen (Tuorla address)
Received:
30
January
1998
Accepted:
20
April
1998
We present optical broad band colour maps of a further sample of 10
Seyfert 2 galaxies. In these bands, the contribution from emission lines to
the total flux is small, and hence the images predominantly trace the
continuum distribution. As in our earlier colour maps of a sample of Seyferts
type 1 and 2, we detect extended blue continuum components in the
circumnuclear region of several galaxies. These components are either
elongated (in Mkn 533, Mkn 607, Mkn 1066, NGC 5347, NGC 5953 and NGC 7319) or
form a double structure across the nucleus (in NGC 5929). They are closely
aligned with the radio and emission line axes of these galaxies and probably
arise from scattering of nuclear continuum light by extranuclear mirrors.
Similar blue elongations (in Mkn 1 and NGC 7212) and double structures (in
NGC 788) are less well aligned with the radio and line emission, and their
relationship with scattering regions must be considered uncertain. The
colours of the blue maxima are consistent with those expected from scattering
off dust or electrons, a conclusion strengthened by the combined sample of
the two papers in this series. Our findings thus strongly support the current
unified models of AGN.
Key words: galaxies: active / galaxies: nuclei / galaxies: seyfert / galaxies: stellar content / galaxies: structure
© European Southern Observatory (ESO), 1998