Distances to molecular clouds in the Galactic longitude l=10-20 deg from the MWISP 12CO 1-0 survey

TL;DR

This paper reports new distance measurements for 56 molecular clouds in the Galactic longitude range 10-20 degrees using the MWISP CO survey and Gaia data, providing insights into their physical properties.

Contribution

First distance determinations for 47 molecular clouds in this region, utilizing a model-calibrated color-distance method with Gaia and 2MASS data.

Findings

Distances range from approximately 275 pc to 2118 pc.

Moderate correlation found between dust extinction and CO integrated intensity.

Identified molecular clouds using DBSCAN algorithm.

Abstract

We present distances to 56 molecular clouds within $10\degr \leq l \leq 20\degr$ and $|b| \leq 5.25\degr$ from the Milky Way Imaging Scroll Painting (MWISP) $^{12}$CO survey, 47 of which are first-time determinations. The molecular clouds were identified using the DBSCAN algorithm, and their distances were measured with the model-calibrated color-distance method using $J-K{_s}$ colors and the distances provided by 2MASS and \textit{Gaia} EDR3. The distances range from $\sim$275 pc to $\sim$2118 pc. We also derived the physical properties of molecular clouds and found a moderate correlation between the dust extinction and the $^{12}$CO integrated intensity.