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Stellar and dynamical masses of brightest cluster galaxies

Published online by Cambridge University Press:  14 May 2020

S. I. Loubser Open the ORCID record for S. I. Loubser [Opens in a new window]
S. I. Loubser*
Affiliation:
Centre for Space Research, North-West University, Potchefstroom 2520, South Africa email: [email protected]
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Abstract

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We investigate the stellar and dynamical mass profiles of 32 brightest cluster galaxies (BCGs, MK = −25.7 to −27.8 mag) in massive clusters (0.05 < z < 0.30), and in particular the rising velocity dispersion profiles of 23 of these BCGs found in Loubser et al. (2018). We make comprehensive measurements of the Gauss-Hermite higher order velocity moments h3 and h4, and find positive central values for h4 for all the BCGs. We model the stellar and dynamical mass profiles of 25 of the BCGs using the Multi-Gaussian Expansion (MGE) and Jeans Anisotropic Method (JAM) for an axisymmetric case, deriving the stellar mass-to-light ratio (ϒ*DYN), and anisotropy (βz). We further explicitly add a dark matter halo mass component (MDM within r200) which we constrain from weak lensing results. In this proceedings, we summarise the study and show an example of the results.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 255 - 256
Copyright
© International Astronomical Union 2020

Footnotes

†

SIL is supported by the National Research Foundation (NRF) of South Africa.

References

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Loubser, S. I., Hoekstra, H., Babul, A., & O’Sullivan, E. 2018, MNRAS, 477, 335CrossRefGoogle Scholar