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McCarthy et al. have investigated the central region of NGC 253 for
the presence of 84.5 GHz methanol emission using the Australia
Telescope Compact Array and have discovered only the second detection
of 84.5 GHz class I methanol maser emission outside 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 at 36.2 GHz and 44.1 GHz. The emission features a narrow
linewidth (∼12 km/s) with a luminosity that is approximately 100,000
times higher than typical Galactic sources. The image above shows
integrated 84.5 GHz methanol emission (red contours), integrated 87.9
GHz HNCO emission (black contours) and the 3 mm continuum emission
(white contours) with a background image of integrated CO (J=2-1)
emission from Sakamoto et al. (2011) on a logarithmic scale.
Full results
are published in the Astrophysical Journal
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