High Resolution Radio and X-Ray Observations of 3C28 in A115

Abstract

High resolution radio and X-ray observations are presented for the cluster of galaxies Abell 115, which is known in the literature for being characterized by a double X-ray structure and a multiple optical structure. The brightest galaxy of the cluster is associated with the radio source 3C28, which shows a very unusual radio morphology in the high resolution map presented here. A tail-type radio source is also found at about 4 arcmin from 3C28, in NE direction. A resolved X-ray structure is detected around 3C28, and is interpreted to originate from a hot gas which is likely to be accreting onto the galaxy. The complex radio structure of 3C28 is understood by invoking a combination of external ram pressure plus buoyancy effects of light radio plasmoids.