Files in this item

FilesDescriptionFormat

application/pdf

application/pdf497652.pdf (1MB)
PresentationPDF

application/pdf

application/pdf1356.pdf (22kB)
AbstractPDF

Description

Title:CLASS I METHANOL MASER CONDITIONS NEAR SNRS
Author(s):McEwen, Bridget C.
Contributor(s):Sjouwerman, Lorヌnt O.; Pihlstrレm, Ylva M.
Subject(s):Astronomy
Abstract:We present results from calculations of the physical conditions necessary for the occurrence of 36.169 ($4_{-1}-3_{0}, E$), 44.070 ($7_{0}-6_{1},A^+$), 84.521 ($5_{-1}-4_{0},E$), and 95.169 ($8_{0}-7_{1},A^+$) GHz methanol (CH$_3$OH) maser emission lines near supernova remnants (SNRs), using the MOLPOP-CEP program. The calculations show that given a sufficient methanol abundance, methanol maser emission arises over a wide range of densities and temperatures, with optimal conditions at $nsim 10^4-10^6$ cm$^{-3}$ and $T>60$ K. The 36~GHz and 44~GHz transitions display more significant maser optical depths compared to the 84~GHz and 95~GHz transitions over the majority of physical conditions. It is also shown that line ratios are an important and applicable probe of the gas conditions. The line ratio changes are largely a result of the $E$-type transitions becoming quenched faster at increasing densities. The modeling results will be discussed using recent observations of CH$_3$OH masers near the SNRs G1.4$-$0.1, W28, and Sgr,A,East and used as a diagnostic tool to estimate densities and temperatures of the regions in which the CH$_3$OH masers are observed.
Issue Date:25-Jun-15
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:ACS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79419
Date Available in IDEALS:2016-01-05


This item appears in the following Collection(s)

Item Statistics