A 95 GHz Methanol Emission Survey Toward Eight Small Supernova Remnants

Abstract

We report on a 95 GHz ($8_0-7_1$ A${}^{+}$) methanol (CH${}_3$OH) emission survey with the Purple Mountain Observatory Delingha 13.7 m telescope. Eight supernova remnants (SNRs) with angular size $\lesssim$ 10' were observed, but emission was only detected in three SNRs near the Galactic center (Sgr A East, G 0.1-0.1, and G 359.92-0.09). CH${}_3$OH emission mainly surrounds the SNRs and can be decomposed into nine spatial peaks with velocity range of eight peaks being (-30, 70) km s${}^{-1}$, and the other (70, 120) km s${}^{-1}$. They are probably excited by interaction with these SNRs and adjacent molecular gas in the central molecular zone (CMZ), although star formation may play an important role in exciting CH${}_3$OH emission in some regions of CMZ. We infer that tidal action is unlikely to be an excitation source for CH${}_3$OH emission.

16 pages, 8 figures, accepted by RAA

References in corpus (5)

• Observations of the Crab Nebula with H.E.S.S
• Very Large Array Observations of Galactic Center OH 1720 MHz Masers in Sagittarius A East and in the Circumnuclear Disk
• Class I Methanol (CH${}_3$OH) Maser Conditions near Supernova Remnants
• Interaction between Cassiopeia A and Nearby Molecular Clouds
• Effelsberg Observations of Excited-State (6.0 GHz) OH in Supernova Remnants and W3(OH)

Cited by in corpus (1)

• Modelling cosmic masers in C-type shock waves -- the coexistence of Class I CH3OH and 1720 MHz OH masers