CO(J = 1 - 0) Observations toward the Filamentary Cloud in the Galactic Region of 153.°60 ≤ l ≤ 156.°50 and 1.°85 ≤ b ≤ 3.°50
Abstract
We present observations of the J = 1 - 0 transition lines of 12CO, 13CO, and C18O toward the Galactic region of 153.°60 ≤ l ≤ 156.°50 and 1.°85 ≤ b ≤ 3.°50, using the Purple Mountain Observatory 13.7 m millimeter telescope. Based on the 13CO data, one main filament and five subfilaments are found together as a network structure in the velocity interval of [-42.5, -30.0] km s-1. The kinematic distance of this molecular cloud is estimated to be ~4.5 kpc. The median length, width, excitation temperature, and line mass of these filaments are ~49 pc, ~2.9 pc, ~8.9 K, and ~39 M ⊙ pc-1, respectively. The velocity structures along these filaments exhibit oscillatory patterns, which are likely caused by the fragmentation or accretion process along these filaments. The maximum accretion rate is estimated to be ~700 M ⊙ pc-1. A total of ~162 13CO clumps and ~103 young stellar objects are identified in this region. Most of the clumps are in gravitationally bound states. Three H II regions (G154.359+2.606, SH2-211, and SH2-212) are found to be located in the apexes of the filaments. Intense star-forming activity is found along the entire filamentary cloud. The observed results may help us to better understand the link between filaments and massive star formation.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2022
- DOI:
- 10.3847/1538-4357/ac8933
- Bibcode:
- 2022ApJ...938...44G
- Keywords:
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- Molecular clouds;
- Interstellar filaments;
- Star forming regions;
- Young stellar objects;
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