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Title: Detection of class I methanol (CH{sub 3}OH) maser candidates in supernova remnants

We have used the Karl G. Jansky Very Large Array to search for 36 GHz and 44 GHz methanol (CH{sub 3}OH) 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 Sgr A East. 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.
Authors:
; ;  [1] ; ; ;  [2]
  1. Department of Physics and Astronomy, University of New Mexico, MSC07 4220, Albuquerque, NM 87131 (United States)
  2. National Radio Astronomy Observatory, P.O. Box 0, Lopezville Road 1001, Socorro, NM 87801 (United States)
Publication Date:
OSTI Identifier:
22340318
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 147; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DETECTION; EXCITATION; GALAXIES; GHZ RANGE; INTERACTIONS; LIMITING VALUES; MASERS; METHANOL; MHZ RANGE; SUPERNOVA REMNANTS; SUPERNOVAE