A New Search for Star Forming Regions in the Southern Outer Galaxy
Carsten K\"onig, James S. Urquhart, Friedrich Wyrowski, Dario Colombo,, Karl M. Menten

TL;DR
This study investigates the structure and star-forming potential of the outer Galaxy using CO observations, revealing its complex three-dimensional structure and a low likelihood of high-mass star formation in this region.
Contribution
It provides detailed physical properties of star-forming clumps in the outer Galaxy and analyzes their relation to large-scale structures, a novel comprehensive survey in this region.
Findings
Strong correlation between CO clouds and high-density Hi emission regions
Maximum 6% of clumps can form high-mass stars
No correlation between physical parameters and expanding supershells
Abstract
Star-formation in the outer Galaxy is thought to be different from the inner Galaxy, as it is subject to different environmental parameters such as metallicity, interstellar radiation field, or mass surface density that all change with Galactocentric radius. We therefore aimed at getting a more detailed view on the structure of the outer Galaxy, determining physical properties for a large number of star forming clumps and understanding star-formation outside the Solar circle. We use pointed CO(2-1) observations conducted with the APEX telescope to determine the velocity components towards 830 dust clumps identified from 250 m Herschel/Hi-GAL SPIRE emission maps in the outer Galaxy between . We determined kinematic distances from the velocity components, in order to analyze the structure of the outer Galaxy and to estimate physical properties such as…
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