Published in
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 1(449), p. 361-372
DOI: 10.1093/mnras/stv303
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The formation of massive, compact galaxies at z = 2 in the Illustris simulation
,
Paul Torrey ,
Chung-Pei Ma,
Vicente Rodriguez-Gomez ,
Mark Vogelsberger,
Mariska Kriek,
Pieter van Dokkum,
Erica Nelson,
Shy Genel,
Annalisa Pillepich,
Volker Springel,
Debora Sijacki,
Gregory Snyder,
Dylan Nelson,
Laura Sales
and other authors.
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Abstract
Massive, quiescent galaxies at high redshift have been found to be considerably more compact than galaxies of similar mass in the local universe. How these compact galaxies formed has yet to be determined, though several progenitor populations have been proposed. Here we investigate the formation processes and quantify the assembly histories of such galaxies in Illustris, a suite of hydrodynamical cosmological simulations encompassing a sufficiently large volume to include rare objects, while simultaneously resolving the internal structure of galaxies. We select massive (~10^11 solar masses) and compact (stellar half-mass radius