Extreme-ultraviolet emission in the Fornax Cluster of galaxies

We present studies of the extreme-ultraviolet (EUV) emission in the Fornax Cluster of galaxies, a relatively nearby well-studied cluster with X-ray-em itting cluster gas and a very large radio source. We examine both the large -scale (approximately the size of the X-ray-emitting cluster gas) and the s mall-scale (<1') emission. We find that this cluster has large-scale diffus e EUV emission. However, at the sensitivity level of the existing Extreme U ltraviolet Explorer (EUVE) data, this emission is entirely due to the low-e nergy tail of the X-ray-emitting gas. We have also examined small-scale str uctures in raw EUVE images of this cluster. We find that small-scale irregu larities are present in all raw Deep Survey images as a result of small-sca le detector effects. These effects can be removed by appropriate flat-field ing. After flat-fielding, the Fornax Cluster still shows a few significant regions of small-scale EUV enhancement. We find that these are emission fro m stars and galaxies in the field. We find that at existing levels of sensi tivity, there is no excess EUV emission in the cluster on either large or s mall scales.