Galaxies in the Illustris simulation as seen by the Sloan Digital Sky Survey - II. Size-luminosity relations and the deficit of bulge-dominated galaxies in Illustris at low mass. Bottrell, C., Torrey, P., Simard, L., & Ellison, S. L. Monthly Notices of the Royal Astronomical Society, 467:2879–2895, May, 2017. ![Galaxies in the Illustris simulation as seen by the Sloan Digital Sky Survey - II. Size-luminosity relations and the deficit of bulge-dominated galaxies in Illustris at low mass [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The interpretive power of the newest generation of large-volume hydrodynamical simulations of galaxy formation rests upon their ability to reproduce the observed properties of galaxies. In this second paper in a series, we employ bulge+disc decompositions of realistic dust-free galaxy images from the Illustris simulation in a consistent comparison with galaxies from the Sloan Digital Sky Survey (SDSS). Examining the size-luminosity relations of each sample, we find that galaxies in Illustris are roughly twice as large and 0.7 mag brighter on average than galaxies in the SDSS. The trend of increasing slope and decreasing normalization of size-luminosity as a function of bulge fraction is qualitatively similar to observations. However, the size-luminosity relations of Illustris galaxies are quantitatively distinguished by higher normalizations and smaller slopes than for real galaxies. We show that this result is linked to a significant deficit of bulge-dominated galaxies in Illustris relative to the SDSS at stellar masses log M_\\textbackslashstar \/M_\⊙\≲ 11. We investigate this deficit by comparing bulge fraction estimates derived from photometry and internal kinematics. We show that photometric bulge fractions are systematically lower than the kinematic fractions at low masses, but with increasingly good agreement as the stellar mass increases.
@article{bottrell_galaxies_2017-1,
title = {Galaxies in the {Illustris} simulation as seen by the {Sloan} {Digital} {Sky} {Survey} - {II}. {Size}-luminosity relations and the deficit of bulge-dominated galaxies in {Illustris} at low mass},
volume = {467},
issn = {0035-8711},
url = {http://adsabs.harvard.edu/abs/2017MNRAS.467.2879B},
doi = {10.1093/mnras/stx276},
abstract = {The interpretive power of the newest generation of large-volume
hydrodynamical simulations of galaxy formation rests upon their ability
to reproduce the observed properties of galaxies. In this second paper
in a series, we employ bulge+disc decompositions of realistic dust-free
galaxy images from the Illustris simulation in a consistent comparison
with galaxies from the Sloan Digital Sky Survey (SDSS). Examining the
size-luminosity relations of each sample, we find that galaxies in
Illustris are roughly twice as large and 0.7 mag brighter on average
than galaxies in the SDSS. The trend of increasing slope and decreasing
normalization of size-luminosity as a function of bulge fraction is
qualitatively similar to observations. However, the size-luminosity
relations of Illustris galaxies are quantitatively distinguished by
higher normalizations and smaller slopes than for real galaxies. We show
that this result is linked to a significant deficit of bulge-dominated
galaxies in Illustris relative to the SDSS at stellar masses log
M\_\{{\textbackslash}star \}/M\_\{⊙\}≲ 11. We investigate this deficit by comparing
bulge fraction estimates derived from photometry and internal
kinematics. We show that photometric bulge fractions are systematically
lower than the kinematic fractions at low masses, but with increasingly
good agreement as the stellar mass increases.},
urldate = {2018-08-21},
journal = {Monthly Notices of the Royal Astronomical Society},
author = {Bottrell, Connor and Torrey, Paul and Simard, Luc and Ellison, Sara L.},
month = may,
year = {2017},
keywords = {galaxies: structure, hydrodynamics, surveys},
pages = {2879--2895},
}
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In this second paper in a series, we employ bulge+disc decompositions of realistic dust-free galaxy images from the Illustris simulation in a consistent comparison with galaxies from the Sloan Digital Sky Survey (SDSS). Examining the size-luminosity relations of each sample, we find that galaxies in Illustris are roughly twice as large and 0.7 mag brighter on average than galaxies in the SDSS. The trend of increasing slope and decreasing normalization of size-luminosity as a function of bulge fraction is qualitatively similar to observations. However, the size-luminosity relations of Illustris galaxies are quantitatively distinguished by higher normalizations and smaller slopes than for real galaxies. We show that this result is linked to a significant deficit of bulge-dominated galaxies in Illustris relative to the SDSS at stellar masses log M_\\\\textbackslashstar \\/M_\\⊙\\≲ 11. 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In this second paper\nin a series, we employ bulge+disc decompositions of realistic dust-free\ngalaxy images from the Illustris simulation in a consistent comparison\nwith galaxies from the Sloan Digital Sky Survey (SDSS). Examining the\nsize-luminosity relations of each sample, we find that galaxies in\nIllustris are roughly twice as large and 0.7 mag brighter on average\nthan galaxies in the SDSS. The trend of increasing slope and decreasing\nnormalization of size-luminosity as a function of bulge fraction is\nqualitatively similar to observations. However, the size-luminosity\nrelations of Illustris galaxies are quantitatively distinguished by\nhigher normalizations and smaller slopes than for real galaxies. We show\nthat this result is linked to a significant deficit of bulge-dominated\ngalaxies in Illustris relative to the SDSS at stellar masses log\nM\\_\\{{\\textbackslash}star \\}/M\\_\\{⊙\\}≲ 11. We investigate this deficit by comparing\nbulge fraction estimates derived from photometry and internal\nkinematics. We show that photometric bulge fractions are systematically\nlower than the kinematic fractions at low masses, but with increasingly\ngood agreement as the stellar mass increases.},\n\turldate = {2018-08-21},\n\tjournal = {Monthly Notices of the Royal Astronomical Society},\n\tauthor = {Bottrell, Connor and Torrey, Paul and Simard, Luc and Ellison, Sara L.},\n\tmonth = may,\n\tyear = {2017},\n\tkeywords = {galaxies: structure, hydrodynamics, surveys},\n\tpages = {2879--2895},\n}\n\n","author_short":["Bottrell, C.","Torrey, P.","Simard, L.","Ellison, S. 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