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


McCarthy, TP and Ellingsen, SP and Breen, SL and Voronkov, MA and Chen, X, Detection of 84GHz Class I methanol maser emission toward NGC 253, The Astrophysical Journal Letters, 867, (1) Article L4. ISSN 2041-8205 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 The American Astronomical Society

DOI: doi:10.3847/2041-8213/aae82c


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 kms-1) 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 Details

Item Type:Refereed Article
Keywords:galaxies: individual (NGC 253), galaxies: starburst, masers, radio lines: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:McCarthy, TP (Dr Tiege McCarthy)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:128987
Year Published:2018
Web of Science® Times Cited:3
Deposited By:Mathematics and Physics
Deposited On:2018-10-31
Last Modified:2019-02-27

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