A CS(2-1) survey of IRAS point sources with color characteristics of ultra-compact HII regions.

Astronomy and Astrophysics – Astrophysics

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Galaxy: Structure, Infrared: Interstellar: Continuum, Interstellar Medium: Clouds, Interstellar Medium: Hii Regions, Interstellar Medium: Molecules, Radio Lines: Molecular

Scientific paper

We have made a complete survey of the CS(2-1) emission toward IRAS point sources in the galactic plane. The sources observed were selected according to their far infrared (FIR) colors, which are characteristic of UC HII regions. They have 25μm/12μm flux ratios larger than 3.7 and 60μm/12μm flux ratios larger than 19.3. The survey covered a region from b=-2deg to b=2deg from l=300deg to l=0deg and from l=0deg to l=60deg, and from b=-4deg to b=4deg elsewhere. We detected 843 sources out of 1427 sources observed. The distributions of detected and undetected sources in a FIR color-color diagram show some differences, suggesting that more than one type of object is present in our observed sample.

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