Molecular clouds in pecular velocity field in the Outer Galaxy

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We have conducted an analysis of a selected region from the FCRAO Outer Galaxy Survey. The selected region is located between galactic longitude 117° and 124° with the velocity of -23 kms < V_{LSR} < -10 kms. Molecular clouds in this region show a peculiar velocity field protruding from the Local Arm population. Though we were not able to find the direct driving source for our target region, we find that there are several internal YSOs or star forming activities; there are many associated sources like an outflows, high-mass protostellar candidate and H_{2}O maser sources. We attribute the driving energy source to older generation of episodic star formation. Masses of main clouds (cloud 1 - 4) estimated using a conversion factor from \coc luminosity are larger than 10^{4} M_{&sun;}. Other components have a small mass as about 10^{3} M_{&sun;}. Among main clouds, cloud 2 and 4 seem to be marginally gravitational bound systems as their ratio of M_{CO} to M_{VIR} is about 2˜3, and the internal velocity dispersion is larger than the centroid velocity dispersion. Total mass estimated using a conversion factor from \coc luminosity is 7.9 × 10^{4} M_{&sun;}.

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