Data · dataset · 2026
Possible collision-induced outflows and triggered star formation in the molecular complex G34
Listed in ScienceDB
G34 is an active star-forming region with complex velocity components.
Description
Within the 38–63 km s|$^{-1}$| velocity range, we identify a possible cloud–cloud collision at a distance of |$\sim$|3 kpc. Using the |$\rm ^{12}CO$| (|${\it J}$| = 1–0) line from the Purple Mountain Observatory 13.7-m millimeter telescope to trace the diffuse gas structures associated with the collision.
The gas components at 38–50 and 53–63 km s|$^{-1}$| exhibit a U-shaped complementary distribution and a bridge feature in the position–velocity diagram. At the collision interface, the velocity dispersion of |$\rm ^{12}CO$| is significantly enhanced, which may result from the impact of the collision. We analyse the spatial distributions of 6.7 GHz CH|$_3$|OH masers, APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) clumps, H ii regions, young stellar objects, and O-type stars, finding that most are concentrated near the collision interface.
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This supports a strong coupling between cloud–cloud collisions and star formation. In addition, we detect H i self-absorption features and molecular outflows at the interface. Based on observations of 6 and 2 cm H|$_2$|CO lines from the Effelsberg 100 m and Tianma Radio Telescope 64 m telescopes, along with NH|$_3$| lines from the Nanshan 26 m telescope, we derive an H|$_2$| volume density of |$10^4$|–|$10^5$| cm|$^{-3}$| in the compressed region.
Finally, we compare the collision time-scales (|$\gtrsim$|0.35 Myr), the dynamical age of the H ii region G34.26+0.15 (|$\gtrsim$|0.33 Myr), and the outflow time-scale (|$\sim$|7.5 Myr). The results suggest that gas at the base of the U-shaped structure was compressed during the collision and driven into the outflow. After millions of years of evolution, the gas density increased, potentially triggering star formation.
Links
Where it is published
- DOI doi.org/10.57760/sciencedb.39660 ↗
DOI / persistent id · from scidb cn
Catalogue records · 1
- OAI-PMH record scidb.cn/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=10.57760%2… ↗
metadata API · from scidb cn
Topics
- From keywords
- Earth & Environmental Science · Engineering · Humanities · Life Sciences · Social Science
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| ScienceDB | 10.57760/sciencedb.39660 | 9 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:engineering | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:humanities | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:life-sciences | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:social-science | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| description | source · scidb cn | connector:scidb_cn@1.0.0 | /metadata/dc/description |
| license | source · scidb cn | connector:scidb_cn@1.0.0 | /metadata/dc/rights |
| publication_date | source · scidb cn | connector:scidb_cn@1.0.0 | |
| title | source · scidb cn | connector:scidb_cn@1.0.0 | /metadata/dc/title |