A relationship between SNR G109.1 – 1.0 and the molecular cloud of Sh2 – 152?

Abstract

During a survey of the galactic plane at a frequency 0.610 GHz, Hughes et al.¹ discovered a new supernova remnant (SNR G109.1 – 1.0) which had already been detected as a radio source (CTB109) at 960 MHz by Wilson and Bolton². Optical observations by Hughes et al.¹ reveal filamentary structures, and a large [SII]/Hα characteristic of SNRs has been measured by Blair and Kirschner³. Gregory and Fahlman⁴, using the Einstein X-ray Observatory, found at the position of the SNR an extraordinary new X-ray source. Their X-ray picture shows a clear semicircular arc with an angular diameter of 36 arc min which seems to be the outer shell of the SNR. Emerging from the east side of the central X-ray source GF2259 + 586 is a jet-like structure which curves northwards in another continuous arc smoothly joining the outer shell. From a number of common apparent features Gregory and Fahlman⁴ suspect another object of the same class as SS433. Here we report recent observations of the complex Sh2 – 147/Sh2 – 153 (see ref. 5) in the molecular line ¹³CO (J = 1→0) carried out with the newly developed POM telescope of the Bordeaux Observatory. Our results are compared with those of Israel⁶ in ¹²CO. Several lines of evidence point to a physical association of SNR G109.1 – 1.0 and the X-ray source GF2259 + 586 with the molecular cloud of Sh2 – 152, as it has already been observed, for example, for IC443 and the Cygnus Loop⁷.