eCite Digital Repository

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

Citation

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

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 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 and Space 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 (Mr Tiege McCarthy)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:128987
Year Published:2018
Deposited By:Mathematics and Physics
Deposited On:2018-10-31
Last Modified:2019-02-27
Downloads:0

Repository Staff Only: item control page