TL;DR
This paper reports the discovery of a dark, radio-quiet supernova remnant in a molecular cloud, which may influence our understanding of supernova rates and star formation history in the Galaxy.
Contribution
It presents evidence for a relic, radio-quiet supernova remnant, expanding the known types of SNRs and their observational signatures.
Findings
Identified a CO-line emission hole of 3.7 pc in diameter.
Suggested the hole is a relic SNR, not a YSO-driven bubble.
Implications for supernova rate estimates in the Galaxy.
Abstract
An almost perfect round hole of CO-line emission with a diameter of 3.7 pc was found in a molecular cloud (MC) centered on G35.75-0.25 () at radial velocity of 28 km s. The hole is quiet in radio continuum emission, unlike the usual supernova remnants (SNR), and the molecular edge is only weakly visible in 8 and 24 m dust emissions. The hole may be either a fully evolved molecular bubble around a young stellar object (YSO), or a relic of a radio-quiet SNR that has already stopped expansion after rapid evolution in the dense MC as a buried SNR. Because G35.75 exhibits quite different properties from YSO-driven bubbles of the same size, we prefer the latter interpretation. Existence of such a "dark" SNR would affect the estimation of the supernova rate, and therefore the star formation history in the Galaxy.
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