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Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence | | Shy Genel
; S. Michael Fall
; Lars Hernquist
; Mark Vogelsberger
; Gregory F. Snyder
; Vicente Rodriguez-Gomez
; Debora Sijacki
; Volker Springel
; | | Date: |
3 Mar 2015 | | Abstract: | We study the angular momentum of galaxies in the Illustris cosmological
simulation, which captures gravitational and gas dynamics within galaxies, as
well as feedback from stars and black holes. We find that the angular momentum
of the simulated galaxies matches observations well, and in particular two
distinct relations are found for late-type versus early-type galaxies. The
relation for late-type galaxies corresponds to the value expected from full
conservation of the specific angular momentum generated by cosmological tidal
torques. The relation for early-type galaxies corresponds to retention of only
~30% of that, but we find that those early-type galaxies with low angular
momentum at z=0 nevertheless reside at high redshift on the late-type relation.
To gain further insight, we explore the scaling relations in simulations where
the galaxy formation physics is modified with respect to the fiducial model. We
find that galactic winds with high mass-loading factors are essential for
obtaining the high angular momentum relation typical for late-type galaxies,
while AGN feedback largely operates in the opposite direction. Hence, feedback
controls the angular momentum of galaxies, and appears to be instrumental for
establishing the Hubble sequence. | | Source: | arXiv, 1503.1117 | | Services: | Forum | Review | PDF | Favorites | |
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