Trigonometric Parallaxes of Massive Star Forming Regions: VIII. G12.89+0.49, G15.03-0.68 (M17) and G27.36-0.16

TL;DR

This paper presents precise parallax measurements for three massive star-forming regions, refining their distances and confirming their locations within the Carina-Sagittarius spiral arm, which enhances our understanding of galactic structure.

Contribution

The study provides new, accurate distance measurements for three star-forming regions using trigonometric parallaxes, improving the mapping of galactic spiral arms.

Findings

Distances to G12.89+0.49, G15.03-0.68, and G27.36-0.16 are precisely determined.

G12.89+0.49 and G15.03-0.68 are located in the Carina-Sagittarius arm.

G27.36-0.16 is located at approximately 8 kpc from the Sun.

Abstract

We report trigonometric parallaxes for three massive star forming regions, corresponding to distances of $2.34^{+0.13}_{-0.11}$ kpc for G12.89+0.49 (also known as IRAS 18089-1732),$1.98^{+0.14}_{-0.12}$ kpc for G15.03-0.68 (in the M17 region), and $8.0^{+4.0}_{-2.0}$ kpc for G27.36-0.16. Both G12.89+0.49 and G15.03-0.68 are located in the Carina-Sagittarius spiral arm.