The size evolution of star-forming and quenched galaxies in the IllustrisTNG simulation

By Shy Genel, D. Nelson, A. Pillepich, Volker Springel, Rüdiger Pakmor, R. Weinberger, L. Hernquist, Jill P. Naiman, M. Vogelsberger, F. Marinacci and 1 more. 2017

164 citations recorded by the source corpus.

We analyze scaling relations and evolution histories of galaxy sizes in TNG100, part of the IllustrisTNG simulation suite. Observational qualitative trends of size with stellar mass, star-formation rate and redshift are reproduced, and a quantitative comparison of projected r-band sizes at 0~ ~10^{9.5}Msun, the evolution of the median main progenitor differs, with quenched galaxies hardly growing in median size before quenching, whereas main-sequence galaxies grow their median size continuously, thus opening a gap from the progenitors of quenched galaxies. This is partly because the main-sequence high-redshift progenitors of quenched z=0 galaxies are drawn from the lower end of the size distribution of the overall population of main-sequence high-redshift galaxies. (ii) Quenched galaxies with M_{*,z=0}>~10^{9.5}Msun experience a steep size growth on the size-mass plane after their quenching time, but with the exception of galaxies with M_{*,z=0}>~10^{11}Msun, the size growth after quenching is small in absolute terms, such that most of the size (and mass) growth of quenched galaxies (and its variation among them) occurs while they are still on the main-sequence. After they become quenched, the size growth rate of quenched galaxies as a function of time, as opposed to versus mass, is similar to that of main-sequence galaxies. Hence, the size gap is retained down to z=0.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/bcfa84c91744c8048cc3fe9e617f393a229a2237

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Citations in the corpus

First results from the TNG50 simulation: galactic outflows driven by supernovae and black hole feedback (2019, background): “…simulations have started to disentangle the dominant physics driving galaxy formation, understanding not only mean relations and ‘typical’ galaxies (Genel et al. 2018), but also outliers and unique examples (Zhu et al. 2018) – providing, as a result, interpretation for a diverse array of…”
The star formation activity of IllustrisTNG galaxies: main sequence, UVJ diagram, quenched fractions, and systematics (2018, background): “…the galaxy mass-metallicity relation (Torrey et al. 2018) and of the galaxy size-mass relation for star-forming and quiescent galaxies at 0 6 z 6 2 (Genel et al. 2018), the amount and distribution of highly-ionized Oxygen around galaxies (Nelson et al. 2018b), and the dark matter fractions within…”
Cosmological simulations of the circumgalactic medium with 1 kpc resolution: enhanced H i column densities (2018, background): “…simulations have seen dramatic advances in recent years, producing well-resolved stellar discs with sizes, scale lengths, and stellar masses in reasonable agreement with observations of late-type galaxies (e.g. Schaye et al. 2015; Grand et al. 2017; Garrison-Kimmel et al. 2018; Genel et al. 2018b).”
Ingredients for 21 cm Intensity Mapping (2018, background): “…of the match between the simulations and observations in a number of diverse aspects, such as galaxy and halo sizes, colors, metallicities, magnetic fields and clustering, are presented in the references above as well as in Genel et al. (2017), Vogelsberger et al. (2017) and Torrey et al. (2017).”