Trigonometric Parallaxes of Massive Star Forming Regions: IV. G35.20-0.74 and G35.20-1.74

TL;DR

This paper presents precise distance measurements to two massive star-forming regions using trigonometric parallaxes, revealing their locations in the Carina-Sagittarius spiral arm and their peculiar motions relative to Galactic rotation.

Contribution

It provides new parallax-based distances and full space motions for G35.20-0.74 and G35.20-1.74, improving understanding of their positions and dynamics within the Galaxy.

Findings

Distances are 2.19 and 3.27 kpc for the regions.

Both regions have peculiar motions of ~13-16 km/s counter to Galactic rotation.

Locations confirm they are in the Carina-Sagittarius spiral arm.

Abstract

We report trigonometric parallaxes for the high-mass star forming regions G35.20-0.74 and G35.20-1.74, corresponding to distances of 2.19 (+0.24 -0.20) kpc and 3.27 (+0.56 -0.42) kpc, respectively. The distances to both sources are close to their near kinematic distances and place them in the Carina-Sagittarius spiral arm. Combining the distances and proper motions with observed radial velocities gives the locations and full space motions of the star forming regions. Assuming a standard model of the Galaxy, G35.20-0.74 and G35.20-1.74 have peculiar motions of ~13 km/s and ~16 km/s counter to Galactic rotation and ~9 km/s toward the North Galactic Pole.