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On the Origin of the Variety of Velocity Dispersion Profiles of Galaxies by Han, San; Yi, Sukyoung K.; Oh, Sree; Pak, Mina; Croom, Scott M.; Devriendt, Julien; Dubois, Yohan; Kimm, Taysun; Kraljic, Katarina; Pichon, Christophe; Volonteri, Marta is a scholarly article available to read on EtoBox.

What is On the Origin of the Variety of Velocity Dispersion Profiles of Galaxies about?

Observed and simulated galaxies exhibit a significant variation in their velocity dispersion profiles. We examine the inner and outer slopes of stellar velocity dispersion profiles using integral field spectroscopy data from two surveys, SAMI (for $z < 0.115$) and CALIFA (for $z < 0.03$), comparing them with results from two cosmological hydrodynamic simulations: Horizon-AGN (for $z = 0.017$) and NewHorizon (for $z\lesssim1$). The simulated galaxies closely reproduce the variety of velocity dispersion slopes and stellar mass dependence of both inner and outer radii ($0.5\,r_{50}$ and $3\,r_{50}$) as observed, where $r_{50}$ stands for half-light radius. The inner slopes are mainly influenced by the relative radial distribution of the young and old stars formed in-situ: a younger center shows a flatter inner profile. The presence of accreted (ex-situ) stars has two effects on the velocity dispersion profiles. First, because they are more dispersed in spatial and velocity distributions compared to in-situ formed stars, it increases the outer slope of the velocity dispersion profile. It also causes the velocity anisotropy to be more radial. More massive galaxies have a higher fraction

Author

Han, San; Yi, Sukyoung K.; Oh, Sree; Pak, Mina; Croom, Scott M.; Devriendt, Julien; Dubois, Yohan; Kimm, Taysun; Kraljic, Katarina; Pichon, Christophe; Volonteri, Marta

Published

2023

Language

EN