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19 April 2024 |
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Galaxy Morphology and Star Formation in the Illustris Simulation at z=0 | | Gregory F. Snyder
; Paul Torrey
; Jennifer M. Lotz
; Shy Genel
; Cameron K. McBride
; Mark Vogelsberger
; Annalisa Pillepich
; Dylan Nelson
; Laura V. Sales
; Debora Sijacki
; Lars Hernquist
; Volker Springel
; | | Date: |
26 Feb 2015 | | Abstract: | We study how optical galaxy morphology depends on mass and star formation
rate (SFR) in the Illustris Simulation. To do so, we measure automated
diagnostics of galaxy structure in 10808 simulated galaxies at z=0 with stellar
masses 10^9.7 < M_*/M_sun < 10^12.3. We add observational realism to idealized
synthetic images and measure non-parametric statistics in rest-frame u, g, i,
and H band images from four directions. We find that the Illustris simulation
creates a morphologically diverse population of galaxies, occupying roughly the
observed bulge strength locus, and reproducing median morphology trends versus
stellar mass, SFR, and compactness. Optical morphology correlates realistically
with rotational structure, following qualitative classification schemes put
forth by kinematic surveys. Relative type fractions as a function of
environment agree roughly with data. These results imply that connections among
mass, star formation, and galaxy structure arise naturally from models matching
global star formation and halo occupation functions when simulated with
accurate numerical methods. This raises a question of how to construct the best
experiments on large galaxy surveys to better distinguish between models. We
predict that at fixed halo mass near 10^12 M_sun, galaxies with relatively more
disc-like morphologies have higher stellar mass than those with bulge-like
morphologies, a possible consequence of the Illustris feedback model acting on
massive galaxies. While Illustris galaxies at M_* ~ 10^11 M_sun have a
reasonable size distribution, those at M_* ~ 10^10 M_sun have half-light radii
larger than observed by roughly a factor of 2. Furthermore, at M_* ~ 10^10.5
through 10^11 M_sun, a relevant fraction of Illustris galaxies have distinct
"ring-like" features, such that the bright pixels have an unusually wide
spatial extent (M_20 > -1). | | Source: | arXiv, 1502.7747 | | Services: | Forum | Review | PDF | Favorites | |
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