Distances to southern 6.7-GHz methanol masers through H I self-absorption

Details Distances to southern 6.7-GHz methanol masers through H I self-absorption Distances to southern 6.7-GHz methanol masers through H I self-absorption

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.417.2500g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 417, Issue 4, pp. 2500-2553.

Astronomy and Astrophysics

Astronomy

5

Masers, Surveys, Stars: Formation

Scientific paper

We present the kinematic distance ambiguity resolutions of over 400 6.7-GHz methanol masers. Using the data sets of the International Galactic Plane Survey we have extracted H I spectra towards the sites of methanol maser emission between longitudes 270° and 67° and examined them for evidence of H I self-absorption. Using well-established criteria we identify 442 resolutions (classified by reliability) with a 1.07:1.11 ratio between near and far kinematic distance assignments. For a sub-sample of 118, we compare our resolutions with those of the literature and find 85 ± 10 per cent agreement. Using the distances we examine the Galactocentric distribution and properties of the masers. We also compare 6.7-GHz maser velocities with those of CS, finding the maser mid-velocity is closely correlated with the CS velocity, typically to within 2.8 km s-1.

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