Abstract

JORDAN, E et al. Haystack observations of CS and CH₃OH toward star forming regions. Rev. mex. astron. astrofis [online]. 2008, vol.44, n.1, pp.45-55. ISSN 0185-1101.

We report ¹²CS J= 1 0 observations toward 20 star forming regions conducted with the MIT 37 m Haystack telescope. Three of the sources were also observed in the ¹³CS J = 1 0 line, and five sources where observed in the CH₃OH J_K = 7₀ 6₁ A⁺ transition at 44 GHz. We detected ¹³CS and CH₃OH emission toward all sources observed, and ¹²CS emission toward 19 of the 20 sources in the sample, 11 of which are new detections. We found a strong correlation between the ¹²CS FWHM and the source distance, indicating the potential use of ¹²CS J = 1 0 emission as a tool to estimate distances to star forming regions. We also report detection of CH₃OH 44 GHz maser variability in most of the observed sources.

Keywords : H II regions; ISM: molecules; stars: formation.

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