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The first quiescent galaxies in TNG300.
- Source :
- Monthly Notices of the Royal Astronomical Society; Jun2023, Vol. 522 Issue 2, p3138-3144, 7p
- Publication Year :
- 2023
-
Abstract
- We identify the first quiescent galaxies in TNG300, the largest volume of the IllustrisTNG cosmological simulation suite, and explore their quenching processes and time evolution to z  = 0. We find that the first quiescent galaxies with stellar masses M <subscript>*</subscript> > 3 × 10<superscript>10</superscript> M<subscript>⊙</subscript> and specific star formation rates sSFR < 10<superscript>−11</superscript> yr<superscript>−1</superscript> emerge at z ∼ 4.2 in TNG300. Suppression of star formation in these galaxies begins with a thermal mode of active galactic nucleus feedback at z ∼ 6, and a kinetic feedback mode acts in each galaxy by z ∼ 4.7 to complete the quenching process, which occurs on a time-scale of ∼0.35 Gyr. Surprisingly, we find that the majority of these galaxies are not the main progenitors of their z  = 0 descendants; instead, four of the five galaxies fall into more massive galaxies in subsequent mergers at a range of redshifts 2.5 < z < 0.2. By z  = 0, these descendants are the centres of galaxy clusters with average stellar masses of 8 × 10<superscript>11</superscript> M<subscript>⊙</subscript>. We make predictions for the first quenched galaxies to be located by the JWST. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 522
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 163749100
- Full Text :
- https://doi.org/10.1093/mnras/stad1162