MOSEL and IllustrisTNG: Massive Extended Galaxies at z=2 Quench Later Than Normal-size Galaxies

Abstract

Using the TNG100 (100 Mpc)^3 simulation of the IllustrisTNG project, we demonstrate a strong connection between the onset of star formation quenching and the stellar size of galaxies. We do so by tracking the evolutionary history of extended and normal-size galaxies selected at z=2 with log(M_star) = 10.2 - 11 and stellar-half-mass-radii above and within 1-sigma of the stellar size--stellar mass relation, respectively. We match the stellar mass and star formation rate distributions of the two populations. By z=1, only 36% of the extended massive galaxies have quenched, in contrast to a quenched fraction of 69% for the normal-size massive galaxies. We find that normal-size massive galaxies build up their central stellar mass without a significant increase in their stellar size between z=2-4, whereas the stellar size of the extended massive galaxies almost doubles in the same time. In IllustrisTNG, lower black hole masses and weaker kinetic-mode feedback appears to be responsible for the delayed quenching of star formation in the extended massive galaxies. We show that relatively gas-poor mergers may be responsible for the lower central stellar density and weaker supermassive black hole feedback in the extended massive galaxies.

15 pages, 9 figures, Accepted for publication in the Astrophysical Journal

References in corpus (21)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Compaction and Quenching of High-z Galaxies in Cosmological Simulations: Blue and Red Nuggets
• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• The Size Evolution of Star-forming and Quenched Galaxies in the IllustrisTNG simulation
• The Formation of Massive, Compact Galaxies at z=2 in the Illustris Simulation
• The role of mergers and halo spin in shaping galaxy morphology
• Morphology and star formation in IllustrisTNG: the build-up of spheroids and discs
• Hot gas in massive halos drives both mass quenching and environment quenching
• Supermassive black holes as the regulators of star formation in central galaxies
• Connection Between Stellar Mass Distributions Within Galaxies and Quenching Since z =2
• Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z$\gtrsim$2: High velocity dispersions in progenitors of compact quiescent galaxies
• Interacting galaxies in the IllustrisTNG simulations -- II: Star formation in the post-merger stage
• Minor Mergers or Progenitor Bias? The Stellar Ages of Small and Large Quenched Early-Type Galaxies
• Galaxy And Mass Assembly (GAMA): Environmental Quenching of Centrals and Satellites in Groups
• ELUCID IV: Galaxy Quenching and its Relation to Halo Mass, Environment, and Assembly Bias
• Nearly all Massive Quiescent Disk Galaxies have a Surprisingly Large Atomic Gas Reservoir
• The properties of the Malin 1 galaxy giant disk: A panchromatic view from the NGVS and GUViCS surveys
• Gravitational Potential and Surface Density Drive Stellar Populations -- II. Star-Forming Galaxies
• Following Black Hole Scaling Relations Through Gas-Rich Mergers
• Evidence for (and Against) Progenitor Bias in the Size Growth of Compact Red Galaxies
• MOSEL: Strong [OIII]5007 Å Emitting Galaxies at (3<z<4) from the ZFOURGE Survey

Cited by in corpus (7)

• The formation of low surface brightness galaxies in the IllustrisTNG simulation
• Quenching Timescales in the IllustrisTNG Simulation
• MOSEL survey: JWST reveals major mergers/strong interactions drive the extreme emission lines in the early universe
• ZFIRE: The Beginning of the End for Massive Galaxies at z ~ 2 and Why Environment Matters
• Introducing cosmosTNG: simulating galaxy formation with constrained realizations of the COSMOS field
• The LEGA-C galaxy survey: multiple quenching channels for quiescent galaxies at $z\sim 1$
• The LEGA-C and SAMI Galaxy Surveys: Quiescent Stellar Populations and the Mass-Size Plane across 6 Gyr