Parallaxes for star forming regions in the inner Perseus spiral arm

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.

arXiv comment18 pages, 4 figures, accepted for publication in The Astronomical Journal. arXiv admin note: text overlap with arXiv:1312.3856

References in corpus (23)

• The Milky Way in Molecular Clouds: A New Complete CO Survey
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• Estimating distances from parallaxes
• First GLIMPSE Results on the Stellar Structure of the Galaxy
• The WISE Catalog of Galactic HII Regions
• DiFX: A software correlator for very long baseline interferometry using multi-processor computing environments
• A Parallax-based Distance Estimator for Spiral Arm Sources
• Self-Perpetuating Spiral Arms in Disk Galaxies
• Trigonometric Parallaxes of Massive Star Forming Regions: I. S 252 & G232.6+1.0
• Micro-Arcsecond Radio Astrometry
• The RMS Survey: Galactic distribution of massive star formation
• Parallaxes for W49N and G048.60+0.02: Distant Star Forming Regions in the Perseus Spiral Arm
• The Bolocam Galactic Plane Survey IX: Data Release 2 and Outer Galaxy Extension
• Dynamics of stars around spiral arms in an N-body/SPH simulated barred-spiral galaxy
• The local spiral structure of the Milky Way
• Mapping Spiral Structure on the far side of the Milky Way
• Short-term dynamical evolution of grand-design spirals in barred galaxies
• The Bolocam Galactic Plane Survey. X. A Complete Spectroscopic Catalog of Dense Molecular Gas Observed toward 1.1 mm Dust Continuum Sources with 7.5 <= l <= 194 degrees
• A Green Bank Telescope Survey of Large Galactic HII Regions
• Tracing the Spiral Structure of the Outer Milky Way with Dense Atomic Hydrogen Gas
• Techniques for Accurate Parallax Measurements for 6.7-GHz Methanol Masers
• Revising the kinematics of 12GHz CH3OH masers in W3(OH)

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• Molecular cloud distances based on the MWISP CO survey and Gaia DR2
• Using classical Cepheids to study the far side of the Milky Way disk. II. The spiral structure in the first and fourth Galactic quadrants
• Distances to molecular clouds in the second Galactic quadrant
• Modeling of Spiral Structure in a Multi-Component Milky~Way-Like Galaxy
• Vertical Structure and Kinematics of the Galactic Outer Disk
• Inverse Multview I: Multi-Calibrator inverse phase referencing for Microarcsecond VLBI Astrometry
• VERA astrometry toward the Perseus arm gap
• Spatial and velocity offsets of Galactic masers from the centers of spiral arms
• Surveying the Giant HII Regions of the Milky Way with SOFIA: IV. Sgr D, W42, and a Reassessment of the Giant HII Region Census
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