WALLABY Hydra I cl. H I galaxy morphometrics Virtual Observatory Resource

Authors
  1. Holwerda B.W.
  2. Bigiel F.
  3. Bosma A.
  4. Courtois H.M.
  5. Deg N.
  6. Denes H.,Elagali A.
  7. For B.-Q.
  8. Koribalski B.
  9. Leahy D.A.
  10. Lee-Waddell K.,Lopez-Sanchez A.R.
  11. Oh S.-H.
  12. Reynolds T.N.
  13. Rhee J.
  14. Spekkens K.
  15. Wang J.,Westmeier T.
  16. Wong O.I.
  17. Published by
    CDS
Abstract

Galaxy morphology in atomic hydrogen (H I) and in the ultraviolet (UV) are closely linked. This has motivated their combined use to quantify morphology over the full H I disc for both H I and UV imaging. We apply galaxy morphometrics: concentration, asymmetry, gini, M20 and multimode-intensity-deviation statistics to the first moment-0 maps of the WALLABY Survey of galaxies in the hydra cluster centre. Taking advantage of this new H I survey, we apply the same morphometrics over the full H I extent on archival GALEX FUV and NUV data to explore how well H I truncated, extended ultraviolet disc (XUV) and other morphological phenomena can be captured using pipeline WALLABY data products. Extended H I and UV discs can be identified relatively straightforward from their respective concentration. Combined with WALLABY H I, even the shallowest GALEX data are sufficient to identify XUV discs. Our second goal is to isolate galaxies undergoing ram-pressure stripping in the H I morphometric space. We employ four different machine learning techniques, a decision tree, a k-nearest neighbour, a support-vector machine, and a random forest. Up to 80 per cent precision and recall are possible with the random forest giving the most robust results.

Keywords
  1. galaxy-clusters
  2. galaxy-groups
  3. galaxies
  4. intergalactic-medium
  5. visible-astronomy
  6. narrow-band-photometry
  7. h-i-line-emission
  8. galaxy-classification-systems
  9. astrometry
  10. galaxy-kinematics
  11. galaxy-radii
Bibliographic source Bibcode
2023MNRAS.521.1502H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/1502
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/521/1502

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/521/1502
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/521/1502
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/521/1502
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/521/1502/table?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/521/1502/table?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/521/1502/table?

History

2026-06-12T16:49:28Z
Resource record created
2026-06-12T16:03:48Z
Updated
2026-06-12T16:49:28Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr