期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 475, 期 1, 页码 624-647出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx3040
关键词
galaxies: evolution; galaxies: formation
资金
- European Research Council [EXAGAL-308037]
- Simons Foundation
- NASA through Hubble Fellowship - Space Telescope Science Institute [HST-HF-51384.001-A, HST-HF2-51341.001-A]
- MIT RSC award
- Alfred P. Sloan Foundation
- NASA ATP grant [NNX17AG29G]
- NSF AARF award [AST-1402480]
- German Federal Ministry of Education and Research (BMBF)
- German State Ministry for Research of Baden-Wurttemberg (MWK)
- German State Ministry for Research of Bayern (StMWFK)
- German State Ministry for Research of Nordrhein-Westfalen (MIWF)
- Texas Advanced Computing Center through the XSEDE project [AST140063]
- FAS Division of Science, Research Computing Group at Harvard University
- NASA [NAS5-26555]
We introduce the first two simulations of the IllustrisTNG project, a next generation of cosmological magnetohydrodynamical simulations, focusing on the optical colours of galaxies. We explore TNG100, a rerun of the original Illustris box, and TNG300, which includes 2 x 2500(3) resolution elements in a volume 20 times larger. Here, we present first results on the galaxy colour bimodality at low redshift. Accounting for the attenuation of stellar light by dust, we compare the simulated (g - r) colours of 10(9) < M-star/M-circle dot < 10(12.5) galaxies to the observed distribution from the Sloan Digital Sky Survey. We find a striking improvement with respect to the original Illustris simulation, as well as excellent quantitative agreement with the observations, with a sharp transition in median colour from blue to red at a characteristic M-star similar to 10(10.5) M-circle dot. Investigating the build-up of the colour-mass plane and the formation of the red sequence, we demonstrate that the primary driver of galaxy colour transition is supermassive black hole feedback in its low accretion state. Across the entire population the median colour transition time-scale Delta t(green) is similar to 1.6 Gyr, a value which drops for increasingly massive galaxies. We find signatures of the physical process of quenching: at fixed stellar mass, redder galaxies have lower star formation rates, gas fractions, and gas metallicities; their stellar populations are also older and their large-scale interstellar magnetic fields weaker than in bluer galaxies. Finally, we measure the amount of stellar mass growth on the red sequence. Galaxies with M-star > 10(11) M-circle dot which redden at z < 1 accumulate on average similar to 25 per cent of their final z = 0 mass post-reddening; at the same time, similar to 18 per cent of such massive galaxies acquire half or more of their final stellar mass while on the red sequence.
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