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Astron. Astrophys. 338, 8-14 (1998)

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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

1 Department of Astronomy, University of Cape Town, Rondebosch, 7700 South Africa
2 Observatoire de Paris-Meudon, D.A.E.C., 5 Place Jules Janssen, F-92195 Meudon Cedex, France
3 Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany
4 South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa
5 European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
6 Departemento de Astronomia, Universidad de Guanajuato, Apartado Postal 144, Guanajuato, Gto 36000, Mexico

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 [FORMULA] 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 [FORMULA] and [FORMULA] 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 [FORMULA] = 1.6 mag could be determined. The nucleus of the Seyfert is very blue with a strong ([FORMULA] - [FORMULA]) 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, (pwoudt@eso.org)

© European Southern Observatory (ESO) 1998

Online publication: September 8, 1998