SRAO CO Observation of 11 Supernova Remnants in l = 70 to 190 deg

TL;DR

This study used the SRAO 6-m radio telescope to observe CO emissions from eleven supernova remnants, identifying molecular clouds and potential interactions with the remnants' radio structures.

Contribution

First comprehensive CO survey of SNRs between l=70° and 190°, revealing molecular cloud associations and morphological relations with radio emissions.

Findings

Detected CO emission towards most SNRs.

Six SNRs show spatial correlation with molecular clouds.

Identified specific cases of molecular clouds along or blocking SNR shells.

Abstract

We present the results of 12CO J = 1-0 line observations of eleven Galactic supernova remnants (SNRs) obtained using the Seoul Radio Astronomy Observatory (SRAO) 6-m radio telescope. The observation was made as a part of the SRAO CO survey of SNRs between l = 70 and 190 deg, which is intended to identify SNRs interacting with molecular clouds. The mapping areas for the individual SNRs are determined to cover their full extent in the radio continuum. We used halfbeam grid spacing (60") for 9 SNRs and full-beam grid spacing (120") for the rest. We detected CO emission towards most of the remnants. In six SNRs, molecular clouds showed a good spatial relation with their radio morphology, although no direct evidence for the interaction was detected. Two SNRs are particularly interesting: G85.4+0.7, where there is a filamentary molecular cloud along the radio shell, and 3C434.1, where a large molecular cloud appears to block the western half of the remnant. We briefly summarize the results obtained for individual SNRs.