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Detection of 84GHz Class I methanol maser emission toward NGC 253


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Abstract
We have investigated the central region of NGC 253 for the presence of 84.5 GHz (5−1 → 40E) methanol emission using the Australia Telescope Compact Array. We present the second detection of 84.5 GHz class I methanol maser emission outside of the Milky Way. This maser emission is offset from the dynamical center of NGC 253, in a region with previously detected emission from class I maser transitions (36.2 GHz 4−1 → 30E and 44.1 GHz 70 → 61A+ methanol lines). The emission features a narrow linewidth (~12 ) with a luminosity approximately that is 5 orders of magnitude higher than typical Galactic sources. We determine an integrated line intensity ratio of 1.2 ± 0.4 between the 36.2 and 84.5 GHz class I methanol maser emission, which is similar to the ratio observed toward Galactic sources. The three methanol maser transitions observed toward NGC 253 each show a different distribution, suggesting differing physical conditions between the maser sites, and also that observations of additional class I methanol transitions will facilitate investigations of the maser pumping regime.
Item Type: | Article |
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Authors/Creators: | McCarthy, TP and Ellingsen, SP and Breen, SL and Voronkov, MA and Chen, X |
Keywords: | galaxies: individual (NGC 253), galaxies: starburst, masers, radio lines: galaxies |
Journal or Publication Title: | The Astrophysical Journal Letters |
Publisher: | Institute of Physics Publishing Ltd. |
ISSN: | 2041-8205 |
DOI / ID Number: | 10.3847/2041-8213/aae82c |
Copyright Information: | Copyright 2018 The American Astronomical Society |
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