Omega Cen JWST+HST phot. and proper motions Virtual Observatory Resource

Authors
  1. Ziliotto T.
  2. Milone A.P.
  3. Cordoni G.
  4. Marino A.F.
  5. Legnardi M.V.,Dondoglio E.
  6. Bortolan E.
  7. Muratore F.
  8. Published by
    CDS
Abstract

We combine F115W and F277W images collected with the Near Infrared Camera of the James Webb Space Telescope with multiband, multi-epoch Hubble Space Telescope observations of omega Centauri to investigate its multiple stellar populations and internal kinematics. Our study focuses on a region spanning about 0.9 to 2.3 half-light radii from the cluster center, which is largely unexplored by these telescopes. Using chromosome maps, we identified the principal populations along the upper main sequence and among M dwarfs, distinguishing lower-stream stars chemically akin to first-generation globular cluster stars with similar metallicities from upper-stream stars enriched in helium and nitrogen but oxygen poor. Both streams also host subpopulations with varying metallicities. We found radially anisotropic motions, with upper-stream stars exhibiting significantly stronger anisotropy than lower-stream stars. Subdividing the upper stream into extreme and intermediate light-element populations revealed a gradient in anisotropy, with intermediate stars lying between the lower-stream stars and extreme upper-stream populations. However, metal-rich and metal-poor stars within each stream show moderate kinematic differences. The lower-stream stars show a higher angular momentum dispersion compared to upper-stream stars, and they also exhibit stronger systemic rotation and proper motion skewness, further highlighting their kinematic divergence. Finally, leveraging a mass range of about 0.15 to 0.7 solar masses, we detected a low degree of energy equipartition for all cluster stars, which decreases with radial distance from the cluster center.

Keywords
  1. globular-star-clusters
  2. population-ii-stars
  3. hst-photometry
  4. infrared-photometry
  5. proper-motions
Bibliographic source Bibcode
2026A&A...707A..86Z
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A86
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/707/A86

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A86
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/707/A86
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/707/A86
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/A+A/707/A86/photcat?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A86/photcat?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A86/photcat?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A86/chmlowms?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A86/chmlowms?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A86/chmlowms?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A86/chmupms?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A86/chmupms?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A86/chmupms?

History

2026-03-10T12:20:38Z
Resource record created
2026-03-10T11:21:34Z
Updated
2026-03-10T12:20:38Z
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