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- W3035564737 endingPage "1880" @default.
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- W3035564737 abstract "ABSTRACT We investigate the stellar and dynamical mass profiles in the centres of 25 brightest cluster galaxies (BCGs) at redshifts of 0.05 ≤ z ≤ 0.30. Our spectroscopy enables us to robustly measure the Gauss–Hermite higher order velocity moments h3 and h4, which we compare to measurements for massive early-type galaxies, and central group galaxies. We measure positive central values for h4 for all the BCGs. We derive the stellar mass-to-light ratio ($Upsilon _{star rm DYN}$), and velocity anisotropy (β) based on a multi-Gaussian expansion (MGE) and axisymmetric Jeans Anisotropic Methods (cylindrically and spherically aligned). We explicitly include a dark matter halo mass component, which is constrained by weak gravitational lensing measurements for these clusters. We find a strong correlation between anisotropy and velocity dispersion profile slope, with rising velocity dispersion profiles corresponding to tangential anisotropy and decreasing velocity dispersion profiles corresponding to radial anisotropy. The rising velocity dispersion profiles can also indicate a significant contribution from the intracluster light (ICL) to the total light (in projection) in the centre of the galaxy. For a small number of BCGs with rising velocity dispersion profiles, a variable stellar mass-to-light ratio can also account for the profile shape, instead of tangential anisotropy or a significant ICL contribution. We note that, for some BCGs, a variable βz(r) (from radial to tangential anisotropy) can improve the model fit to the observed kinematic profiles. The observed diversity in these properties illustrates that BCGs are not the homogeneous class of objects they are often assumed to be." @default.
- W3035564737 created "2020-06-19" @default.
- W3035564737 creator A5004393017 @default.
- W3035564737 creator A5016823102 @default.
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- W3035564737 creator A5040514228 @default.
- W3035564737 creator A5053437409 @default.
- W3035564737 creator A5074191093 @default.
- W3035564737 date "2020-06-12" @default.
- W3035564737 modified "2023-09-25" @default.
- W3035564737 title "Dynamical masses of brightest cluster galaxies I: stellar velocity anisotropy and mass-to-light ratios" @default.
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