A survey of 20 dense clumps in five massive star-forming regions finds a strong mass-size correlation, weak dynamical correlations, and hints that magnetic fields around 1 mG help stabilize the most massive clumps.
Trigonometric Parallaxes of Massive Star Forming Regions: II. Cep A & NGC 7538
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abstract
We report trigonometric parallaxes for the sources NGC 7538 and Cep A, corresponding to distances of 2.65 [+0.12/-0.11] kpc and 0.70 [+0.04/-0.04] kpc, respectively. The distance to NGC 7538 is considerably smaller than its kinematic distance and places it in the Perseus spiral arm. The distance to Cep A is also smaller than its kinematic distance and places it in the Local arm or spur. Combining the distance and proper motions with observed radial velocities gives the location and full space motion of the star forming regions. We find significant deviations from circular Galactic orbits for these sources: both sources show large peculiar motions (> 10 km/s) counter to Galactic rotation and NGC 7538 has a comparable peculiar motion toward the Galactic center.
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Study of the physical and chemical properties of dense clumps at different evolutionary stages in several regions of massive star and stellar cluster formation
A survey of 20 dense clumps in five massive star-forming regions finds a strong mass-size correlation, weak dynamical correlations, and hints that magnetic fields around 1 mG help stabilize the most massive clumps.