Table · dataset · 2024
W3/4 clump properties from ^13^CO dendrogram leaves
Listed in IVOA Registry (Virtual Observatory)
The W3/4 Giant Molecular Cloud (GMC) is an ideal target to study the impact of HII regions onto the surrounding molecular gas and star formation.
Description
We utilized PMO CO (1-0) data from the Milky Way Imaging Scroll Painting (MWISP) survey to analyze the cloud structure and the feedback effect from the W4 HII region. Our observations show that cold gas, traced by CO, mainly resides in the W3 GMC, with C^18^O concentrated in dense regions, while gas around W4 is dispersed.
The ^13^CO position-position-velocity (PPV) distributions reveal a C shaped structure in the W3 cloud with more redshifted gas at higher galactic longitudes. A high density layer (HDL) region on the eastern side of the W3 region exhibits a flattened structure facing W4. Subdividing the area into sixteen subregions, we find that regions 6-9 on the HDL layer exhibit the strongest radiation, while clouds at the W4 bubble boundary not facing W3 exhibit weak signals, possibly due to star formation triggering and subsequent molecular gas dispersal by the HII region.
Read the rest (2 more)
Analysis along four paths from the W4 HII region to the far side shows a consistent trend of sharply increasing intensity followed by a slow decrease, indicating the gas is effectively eroded and heated by the photon dominated region (PDR) near the boundary of the HII region. Clump identification based on ^13^CO emission reveals 288 structures categorized as bubble, HDL, and quiescent clumps. Analysis of mass- radius and Virial-mass relationships show a potential for high-mass star formation in 29.5% (85/288) of the clumps, with 39.2% (113/288) being gravitationally bound.
HDL clumps exhibit distinct L/M and velocity dispersion, suggesting an earlier evolutionary stage and gravitational instability compared to quiescent and bubble clumps. Clump parameter differences provide evidence for triggered and dispersed effects of the W4 HII region on the HDL and bubble regions, respectively.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A21 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...693A..21S ui.adsabs.harvard.edu/abs/2025A%26A...693A..21S ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/693/a21 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Imaging 75%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/693/a21 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |