An extraordinary new celestial X-ray source

The discovery of an extraordinary new x-ray source designated G109.1 - 1.0 is reported. The source was found using the imaging proportional counter at the Einstein X-ray Observatory on 17 December 1979. A second longer exposure obtained on 8 July 1980 is reproduced and shows a clear semicircular arc, with an angular diameter of 36 arc min, at the centre of which there is a strong compact source and a jet-like structure emerging from the east side of this central source. The question of whether this source is a supernova remnant is discussed. (U.K.)