Table · dataset · 2026
Late-type gal. ultra-deep HI radial profiles
Listed in IVOA Registry (Virtual Observatory)
Galaxy discs have a finite extent, yet how and where their neutral atomic hydrogen (HI) components end is not fully understood.
Description
The existence of a break in the HI disc at column densities of ~10^+19^cm^-2^ has been debated since early 21-cm observations of the spiral galaxy NGC 3198. We present the HI radial profiles of 16 star-forming, late-type galaxies from the MeerKAT HI Observations of Nearby Galactic Objects: Observing Southern Emitters (MHONGOOSE) survey spanning a range of HI mass from 10^+7^M_{sun}_ to 10^+10^M_{sun}_.
We probed via spectral stacking their HI discs down to inclination-corrected column densities of a few times 10^+17^cm^-2^ at kpc resolution. The HI radial profiles of high-mass (MHI>10^+9^M_{sun}_) galaxies are characterised by a inner plateau, followed by a knee at column densities of ~5x10^+20^cm^-2^, but no edges are unambiguously identified. The HI radial profiles of low-mass (MHI<10^+9^M_{sun}-) galaxies shows a steeper decline and also no edges.
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We found that the profiles are self-similar when normalised to the radius at which a mass surface density of 0.01M_{sun}_/pc^2^ is reached, in agreement with recent literature results, but we also found a possible correlation between the normalisation radius and the environment, suggesting that environment contributes to the shaping of the HI distribution in galaxies. The emerging picture is that the diverse morphology of the HI radial profiles is difficult to interpret, and future studies with a larger sample are necessary for quantifying the contribution of internal and external processes acting at different levels for different galaxies.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/712/A74 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...712A..74V ui.adsabs.harvard.edu/abs/2026A%26A...712A..74V ↗
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/712/a74 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/712/a74 | 11 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: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 |