The inner galactic structure traced by molecular clouds associated with Ultra-compact HII regions

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxy: Disk, Hii Regions

Scientific paper

We are testing a method to solve for the distances of a sample of ultra-compact (UC) HII regions with IRAS colors and CS(J=2-1) detection. The ambiguity in their kinematical distances is solved using Monte-Carlo simulations. We simulated heliocentric longitude-Radius (l-R) on Galactic plane distributions, and their respective longitude-Velocity_{LSR} (l-V_{LSR}) projections using synthetic associated molecular clouds. The best Galactic distribution is selected by comparison with observed CO maps. Preliminary results for the Galactic quadrant IV are presented.

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