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Class I methanol masers in NGC253: alcohol at the end of the bar

Citation

Ellingsen, SP and Chen, X and Breen, SL and Qiao, H-H, Class I methanol masers in NGC253: alcohol at the end of the bar, Monthly Notices of the Royal Astronomical Society, 472, (1) pp. 604-615. ISSN 0035-8711 (2017) [Refereed Article]


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DOI: doi:10.1093/mnras/stx2076

Abstract

We have used the Australia Telescope Compact Array to observe the 36.2-GHz class I methanol maser emission towards NGC 253 and find that it is located at the interface between the nuclear ring and both ends of the galactic bar. This is thought to be the location of the inner Linblad resonance and we suggest that the maser emission in this region is likely due to large-scale cloud–cloud collisions. We have detected the first extragalactic 44.1-GHz class I methanol maser and find that it is associated with the 36.2-GHz maser emission. In contrast to the class I methanol masers found in Galactic star formation regions, the 44.1-GHz emission in NGC 253 is two orders of magnitude weaker than the 36.2-GHz masers. Both the 36.2- and 44.1-GHz emission is orders of magnitude stronger than expected from typical high-mass star formation regions. This demonstrates that the luminous class I methanol masers observed in NGC 253 are significantly different from those associated with Galactic star formation.

Item Details

Item Type:Refereed Article
Keywords:masers, galaxies: individual: NGC253, galaxies: starburst, radiolines: ISM
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
Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:121060
Year Published:2017
Deposited By:Mathematics and Physics
Deposited On:2017-09-07
Last Modified:2017-09-11
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