Detection of Class I Methanol (CH3OH) Maser Candidates in Supernova Remnants

Abstract

We have used the Karl G. Jansky Very Large Array (VLA) to search for 36 GHz and 44 GHz methanol (CH3OH) lines in a sample of 21 Galactic supernova remnants (SNRs). Mainly the regions of the SNRs with 1720 MHz OH masers were observed. Despite the limited spatial extent covered in our search, methanol masers were detected in both G1.4-0.1 and W28. Additional masers were found in SgrAEast. More than 40 masers were found in G1.4-0.1 which we deduce are due to interactions between the SNR and at least two separate molecular clouds. The six masers in W28 are associated with the molecular cloud that is also associated with the OH maser excitation. We discuss the possibility that the methanol maser may be more numerous in SNRs than the OH maser, but harder to detect due to observational constraints.

9 pages

References in corpus (3)

• AGILE detection of GeV gamma-ray emission from the SNR W28
• A Survey of Hydroxyl Toward Supernova Remnants: Evidence for Extended 1720 MHz Maser Emission
• Massive Star Formation in the Molecular Ring Orbiting the Black Hole at the Galactic Center

Cited by in corpus (29)

• Cloud-cloud collision as drivers of the chemical complexity in Galactic Centre molecular clouds
• Physical characteristics of bright Class I methanol masers
• Distances, Radial Distribution and Total Number of Galactic Supernova Remnants
• Abundant Methanol Masers but no New Evidence for Star Formation in GCM0.253+0.016
• Online Database of Class I Methanol Masers
• Detection of 36 GHz class I methanol maser emission towards NGCS253
• MALT-45: A 7 mm survey of the southern Galaxy - I. Techniques and spectral line data
• Class I methanol masers in NGC253: Alcohol at the end of the bar
• Class I Methanol (CH${}_3$OH) Maser Conditions near Supernova Remnants
• Methanol masers in NGC 253 with ALCHEMI
• A Complete Catalogue of Dusty Supernova Remnants
• Diagnostics of a Nuclear Starburst: Water and Methanol Masers
• Interferometric Observations of High-Mass Star-Forming Clumps with Unusual N2H+/HCO+ Line Ratios
• MOLPOP-CEP: An Exact, Fast Code for Multi-Level Systems
• Detection of 36 GHz Class I Methanol Maser Emission Towards NGC 4945
• Molecular Emission in Dense Massive Clumps from the Star-Forming Regions S231-S235
• MALT-45: A 7mm survey of the southern Galaxy - II. ATCA follow-up observations of 44GHz class I methanol masers
• NH${}_3$(3,3) and CH${}_3$OH near Supernova Remnants: GBT and VLA Observations
• OMC-2 FIR 4 under the microscope: Shocks, filaments, and a highly collimated jet at 100 au scales
• The physical parameters of clumps associated with class I methanol masers
• Ammonia excitation imaging of shocked gas towards the W28 gamma-ray source HESS J1801-233
• Submillimeter observations of molecular gas interacting with the supernova remnant W28
• 44 GHz Class I Methanol (CH${}_3$OH) Maser Survey in the Galactic Center
• Modelling cosmic masers in C-type shock waves -- the coexistence of Class I CH3OH and 1720 MHz OH masers
• A sensitive search for predicted methanol maser transitions with the Australia Telescope Compact Array
• Molecular Shocks and the Gamma-ray Clouds of the W28 Supernova Remnant
• A 95 GHz Methanol Emission Survey Toward Eight Small Supernova Remnants
• Collisional Pumping of H${}_2$O and CH${}_3$OH Masers in C-Type Shock Waves
• The Maser-Starburst connection in NGC253