20-24 March 2023
Haus H, Telegrafenberg
Europe/Berlin timezone

Centaurus A, its globular clusters, planetary nebulae and dark matter halo shape

24 Mar 2023, 11:45
Haus H, Telegrafenberg

Haus H, Telegrafenberg

Potsdam, Germany
Contributed talk SESSION 5 : Near-field cosmology and galaxy masses beyond the Local Group SESSION 5 : Near-field cosmology and galaxy masses beyond the Local Group


Tadeja Veršič (ESO, University of Vienna)


The mass content of the Universe is dominated by non-baryonic dark matter, according to the Lambda Cold Dark Matter cosmology interpretation of observational evidence. However, not all observations agree with the theory and many predictions remain difficult to investigate. In particular, simulations predict that the shapes of the most massive dark matter haloes deviate from spherical symmetry. The outer regions of galaxies show the most prominent signatures of dark matter. Discrete dynamical modeling of halo tracers offers a unique opportunity to further investigate the presence and large-scale distribution of dark matter in galactic haloes. Extended halo populations of globular clusters (GCs) and planetary nebulae (PNe) are ideal kinematic tracers in the outer regions of the galaxies and can be observed out to 10 or even 15 effective radii in several galaxies. Using both tracers that have distinct kinematic properties and spatial distribution helps in breaking the well-known mass-anisotropy degeneracy that hinders dynamical modeling. In this work we constrain, the flattening of the dark matter halo of Centaurs A galaxy (NGC5128). In my talk I will present the analysis of the photometric and kinematic properties of PNe and GCs and the results from the discrete anisotropic Jeans modeling.

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Primary author

Tadeja Veršič (ESO, University of Vienna)


Ms Marina Rejkuba (ESO) Ms Magda Arnaboldi (ESO) Mr Ortwin Gerhard (MPE) Mrs Hartke Johanna (ESO, University of Oxford) Ms Claudia Pulsoni (MPE) Mr Glenn van de Ven (University of Vienna)

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