Parallaxes for star forming regions in the inner Perseus spiral arm
arXiv:1903.11594 · doi:10.3847/1538-3881/ab141d
Abstract
We report trigonometric parallax and proper motion measurements of 6.7-GHz CH3OH and 22-GHz H2O masers in eight high-mass star-forming regions (HMSFRs) based on VLBA observations as part of the BeSSeL Survey. The distances of these HMSFRs combined with their Galactic coordinates, radial velocities, and proper motions, allow us to assign them to a segment of the Perseus arm with ~< 70 deg. These HMSFRs are clustered in Galactic longitude from ~30 deg to ~50, neighboring a dirth of such sources between longitudes ~50 deg to ~90 deg.
18 pages, 4 figures, accepted for publication in The Astronomical Journal. arXiv admin note: text overlap with arXiv:1312.3856
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