Neutral hydrogen absorption towards G227.1 + 1.0

Abstract

The radio source G227.1 + 1.0 (ref. 1) was observed in a search for young galactic supernova remnants, and its peculiar structure indicated that it might be a very young remnant. Chanan et al.2, however, have recently found a bright optical object with z = 0.073 close to the radio centre, which represents strong circumstantial evidence that the source is in fact a radio galaxy. Here we present a neutral hydrogen absorption profile observed with the Very Large Array (VLA) which confirms the extragalactic nature of this object.