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Multiwavelength observations of a Seyfert 1 galaxy detected in ACO 3627
P.A. Woudt 1, 5,
R.C. Kraan-Korteweg 2, 6,
A.P. Fairall 1,
H. Böhringer 3,
V. Cayatte 2 and
I.S. Glass 4
Received 9 June 1997 / Accepted 18 May 1998
ACO 3627 is a rich, nearby cluster of galaxies at the core of the Great Attractor. At the low galactic latitude of the galactic extinction is significant. Nevertheless, its proximity makes it a prime target for studies of environmental effects on its cluster members. Here, we report on a multi-wavelength study of a Seyfert 1 galaxy at 30 arcmin from the centre of ACO 3627. Its Seyfert nature was discovered spectroscopically and confirmed in X-rays. We have obtained and CCD photometry as well as J, H, K and L aperture photometry at the SAAO, low and high resolution spectroscopy (ESO and SAAO), 21 cm line observations (Parkes Observatory) and X-ray ROSAT PSPC data.
The Seyfert 1 galaxy is of morphology SBa(r). It has a nearby companion (dS0) but shows no signs of interaction. A consistent value for the galactic extinction of = 1.6 mag could be determined. The nucleus of the Seyfert is very blue with a strong ( - ) colour gradient in the inner 2.5 arcsec. The extinction-corrected near-infrared colours of WKK 6092 are typical of a Seyfert 1 and the X-ray spectrum conforms to the expectation of a Seyfert as well. The galaxy has a very low H I flux. This could be explained by its morphology, but also - due to its very central position within the rich Norma cluster - to ram pressure stripping.
Key words: dust, extinction galaxies: clusters: individual: ACO 3627 galaxies: individual: WKK 6092 galaxies: Seyfert galaxies: distances and redshifts galaxies: photometry
Send offprint requests to: Patrick A. Woudt, (email@example.com)
Online publication: September 8, 1998