Multiwavelength Observations of a Seyfert 1 Galaxy Detected in ACO 3627

Details Multiwavelength Observations of a Seyfert 1 Galaxy Detected in ACO 3627 Multiwavelength Observations of a Seyfert 1 Galaxy Detected in ACO 3627

1998-04-06

arxiv.org/abs/astro-ph/9804052v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomy & Astrophysics. 7 pages, LaTex, 6 encapsulated postscript figures, requires l-aa.sty and

Scientific paper

ACO 3627 is a rich, nearby cluster of galaxies at the core of the Great Attractor. At the low galactic latitude of b = -7.2 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 arcminutes from the centre of ACO 3627. Its Seyfert nature was discovered spectroscopically and confirmed in X-rays. We have obtained B_J and R_C 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 A_B = 1.6 mag could be determined. The nucleus of the Seyfert is very blue with a strong (B_J - R_C) 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 HI 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.

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