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Quenched, bulge-dominated, but dynamically cold galaxies in IllustrisTNG and their real-world counterparts by Lu, Shengdong; Xu, Dandan; Wang, Sen; Wang, Yunchong; Mao, Shude; Xia, Xiaoyang; Vogelsberger, Mark; Hernquist, Lars is a scholarly article available to read on EtoBox.

What is Quenched, bulge-dominated, but dynamically cold galaxies in IllustrisTNG and their real-world counterparts about?

Galaxy morphologies, kinematics, and stellar populations are thought to be linked to each other. However, both simulations and observations have pointed out mismatches therein. In this work, we study the nature and origin of the present-day quenched, bulge-dominated, but dynamically cold galaxies within a stellar mass range of $10.3\,\leqslant\,\log\,M_{\ast}/\mathrm{M_{\odot}}\,\leqslant\,11.2$ in the IllustrisTNG-100 Simulation. We compare these galaxies with a population of normal star-forming dynamically cold disc galaxies and a population of normal quenched dynamically hot elliptical galaxies within the same mass range. The populations of the present-day quenched and bulge-dominated galaxies (both being dynamically cold and hot) used to have significantly higher star-formation rates and flatter morphologies at redshift of $z\sim 2$. They have experienced more frequent larger mass-ratio mergers below $z \sim 0.7$ in comparison to their star-forming disc counterparts, which is responsible for the formation of their bulge-dominated morphologies. The dynamically cold populations (both being star-forming and quenched) have experienced more frequent prograde and tangential mergers e

Author

Lu, Shengdong; Xu, Dandan; Wang, Sen; Wang, Yunchong; Mao, Shude; Xia, Xiaoyang; Vogelsberger, Mark; Hernquist, Lars

Published

2021

Language

EN