The multiple stellar population in omega Centauri: spatial distribution and structural properties

Abstract

We present a detailed analysis of the spatial distribution of the stellar populations in the Galactic globular cluster omega Centauri. Taking advantage of the large photometric catalog published by Pancino et al. (2000), we confirm that metal-rich populations have a spatial distribution which is significantly different from the metal-poor dominant population. In particular: (i) the different sub-populations have different centroids and (ii) the metal-poor population is elongated along the E-W direction, while the metal-rich populations are oriented along the orthogonal direction, i.e., N-S. The evidence presented here can partially explain the weird spatial metallicity segregation found by Jurcsik (1998), and further supports the hyphothesis that different sub-populations in omega Centauri might have had different origins.

9 pages, 5 figures, accepted for publication in the MNRAS

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Cited by in corpus (40)

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• Gemini and Hubble Space Telescope Evidence for an Intermediate Mass Black Hole in omega Centauri
• The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation
• The multiplicity of the subgiant branch of Omega Centauri: Evidence for prolonged star formation
• Homogeneous photometry VII. Globular clusters in the Gaia era
• Metallicities, relative ages and kinematics of stellar populations in omega Centauri
• Mining SDSS in search of Multiple Populations in Globular Clusters
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• Deep FORS1 observations of the double Main Sequence of omega Centauri
• The pure non-collisional Blue Straggler population in the giant stellar system omega Centauri
• Discovery of an anomalous Sub Giant Branch in the Color Magnitude Diagram of omega Centauri
• Formation of Multiple Populations in Globular Clusters: Another Possible Scenario
• The Rotation of Sub-Populations in omega Centauri
• Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)
• CCD Photometry of the Globular Cluster omega Centauri. II. Stellar Populations and Age-Metallicity Relation
• On The Birth Masses of the Ancient Globular Clusters
• A Large Sample Study of Red Giants in the Globular Cluster Omega Centauri (NGC 5139)
• Radial anisotropy in omega Cen limiting the room for an intermediate-mass black hole
• Gas depletion in primordial globular clusters due to accretion onto stellar-mass black holes
• The globular cluster NGC 1978 in the Large Magellanic Cloud
• A spectral atlas of post-main-sequence stars in omega Centauri: kinematics, evolution, enrichment and interstellar medium
• The chemical evolution of Omega Centauri's progenitor system
• Dissecting the Colour-Magnitude Diagram: A Homogeneous Catalogue of Stellar Populations in Globular Clusters
• Homogeneous Analysis of Globular Clusters from the APOGEE Survey with the BACCHUS Code $-$ III. $\omega$ Cen
• Cluster Ages to Reconstruct the Milky Way Assembly (CARMA) I. The final word on the origin of NGC6388 and NGC6441
• Open-cluster density profiles derived using a kernel estimator
• The not so simple globular cluster $\omega$ Cen. I. Spatial distribution of the multiple stellar populations
• RAVE stars tidally stripped/ejected from $\omega$ Centauri globular cluster
• IR photometric properties of Red Giants in omega Cen
• oMEGACat III. Multi-band photometry and metallicities reveal spatially well-mixed populations within $\omega$ Centauri's half-light radius
• The not so simple stellar system Omega Cen. II. Evidence in support of a merging scenario
• Homogeneous photometry and star counts in the field of 9 Galactic star clusters
• On the mass of the Galactic star cluster NGC 4337
• A stellar census in globular clusters with MUSE. A new perspective on the multiple main sequences of $\omega$ Centauri
• oMEGACat. VI. Analysis of the overall kinematics of Omega Centauri in 3D: velocity dispersion, kinematic distance, anisotropy, and energy equipartition
• UBVI CCD photometry and star counts in 9 inner disk Galactic star clusters
• Absence of obvious tidal tails around the globular cluster NGC 6397
• An analysis of the blue straggler population in the Sgr dSph globular cluster Arp 2
• Robust ellipticity measurements of 29 Galactic globular clusters