Table · dataset · 2024
NH3 Observations of Cygnus X
Listed in IVOA Registry (Virtual Observatory)
The physical properties, evolution, and fragmentation of massive dense cores (MDCs, ~0.1pc) are fundamental to the understanding of high-mass star formation.
Description
We aim at characterizing the temperature, velocity dispersion, and fragmentation of the MDCs in the Cygnus X giant molecular cloud and to investigate their stability and dynamics. We present the Karl G. Jansky Very Large Array (VLA) observations of the NH_3_ (J, K) = (1,1) and (2,2) inversion lines towards 35 MDCs in Cygnus X, from which the temperature and velocity dispersion are calculated.
We extract 202 fragments (~0.02pc) from the NH_3_ (1,1) moment-0 maps with the GAUSSCLUMPS algorithm. The stability of the MDCs and their NH_3_ fragments is analyzed through evaluating the corresponding kinetic, gravitational potential, and magnetic energies and the virial parameters. The MDCs in Cygnus X have a typical mean kinetic temperature TK of ~20K.
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Virial analysis shows that many MDCs are at sub-virialized states, indicating that the kinetic energy is insufficient to support these MDCs against their gravity. The calculated non-thermal velocity dispersions of most MDCs are at transonic to mildly supersonic levels, and the bulk motions only have a minor contribution to the velocity dispersion. As for the NH_3_ fragments, with TK~19K, their non-thermal velocity dispersions are mostly trans- to sub-sonic.
Unless there is a strong magnetic field, most NH_3_ fragments are probably not at virialized states. We also find that most of the NH_3_ fragments are dynamically quiescent while only a few are active due to star formation activity.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A142 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2024A&A...684A.142Z ui.adsabs.harvard.edu/abs/2024A%26A...684A.142Z ↗
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/684/a142 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Stellar astronomy and planetary systems 76%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/684/a142 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:field:510109 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (76%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| 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 |