Title:	A search for 6.7 GHz methanol masers in M33
Authors:	Goldsmith, P.F. Pandian, J.D. Deshpande, A.A.
Keywords:	Galaxies Messier Number: M33 Molecules, Masers
Issue Date:	Jun-2008
Publisher:	University of Chicago Press for the American Astronomical Society
Citation:	Astrophysical Journal, 2008, Vol.680, p1132
Abstract:	We report the negative results from a search for 6.7 GHz methanol masers in the nearby spiral galaxy M33. We observed 14 GMCs in the central 4 kpc of the Galaxy, and found 3 σ upper limits to the flux density of ~4 mJy at a velocity resolution of 0.35 km s-1. By velocity shifting and combining the spectra from the positions observed, we obtain an effective 3 σ upper limit on the average emission of ~1 mJy in a 0.25 km s-1 channel. These limits lie significantly below what we would expect based on our estimates of the methanol maser luminosity function in the Milky Way. One possible explanation for the absence of detectable methanol masers appears to be the metallicity of M33, which is somewhat less than that of the Milky Way.
Description:	Restricted Access. An open-access version is available at arXiv.org. Articles older than 2 years are open to all at the journal site (alternative location)
URI:	http://hdl.handle.net/2289/3625
ISSN:	P-ISSN : 0004-637X. E-ISSN : 1538-4357
Alternative Location:	http://adsabs.harvard.edu/abs/2008ApJ...680.1132G http://arxiv.org/abs/0710.1677 http://dx.doi.org/ 10.1086/524651
Copyright:	2008 IOP Publishing for the American Astronomical Society
Appears in Collections:	Research Papers (A&A)

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