The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations. Rodriguez-Gomez, V., Snyder, G. F., Lotz, J. M., Nelson, D., Pillepich, A., Springel, V., Genel, S., Weinberger, R., Tacchella, S., Pakmor, R., Torrey, P., Marinacci, F., Vogelsberger, M., Hernquist, L., & Thilker, D. A. ArXiv e-prints, 1809:arXiv:1809.08239, September, 2018. ![The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex We have generated synthetic images of \${\textbackslash}sim\$27,000 galaxies from the IllustrisTNG and the original Illustris hydrodynamic cosmological simulations, designed to match Pan-STARRS observations of \${\textbackslash}log_\{10\}(M_\{{\textbackslash}ast\}/\{{\textbackslash}rm M\}_\{{\textbackslash}odot\}) {\textbackslash}approx 9.8\$-\$11.3\$ galaxies at \$z {\textbackslash}approx 0.05\$. Most of our synthetic images were created with the SKIRT radiative transfer code, including the effects of dust attenuation and scattering, and performing the radiative transfer directly on the Voronoi mesh used by the simulations themselves. We have analysed both our synthetic and real Pan-STARRS images with the newly developed \${\textbackslash}tt\{statmorph\}\$ code, which calculates non-parametric morphological diagnostics – including the Gini-\$M_\{20\}\$ and concentration-asymmetry-smoothness (CAS) statistics – and performs two-dimensional S\textbackslash'\e\rsic fits. Overall, we find that the optical morphologies of IllustrisTNG galaxies are in good agreement with observations, and represent a substantial improvement compared to the original Illustris simulation. In particular, the locus of the Gini-\$M_\{20\}\$ diagram is consistent with that inferred from observations, while the median trends with stellar mass of all the morphological, size and shape parameters considered in this work lie within the \${\textbackslash}sim\$1\${\textbackslash}sigma\$ scatter of the observational trends. However, the IllustrisTNG model has some difficulty with more stringent tests, such as producing a strong morphology-colour relation. This results in a somewhat higher fraction of red discs and blue spheroids compared to observations. Similarly, the morphology-size relation is problematic: while observations show that discs tend to be larger than spheroids at a fixed stellar mass, such a trend is not present in IllustrisTNG.
@article{rodriguez-gomez_optical_2018,
title = {The optical morphologies of galaxies in the {IllustrisTNG} simulation: a comparison to {Pan}-{STARRS} observations},
volume = {1809},
shorttitle = {The optical morphologies of galaxies in the {IllustrisTNG} simulation},
url = {http://adsabs.harvard.edu/abs/2018arXiv180908239R},
abstract = {We have generated synthetic images of \${\textbackslash}sim\$27,000 galaxies from the
IllustrisTNG and the original Illustris hydrodynamic cosmological
simulations, designed to match Pan-STARRS observations of
\${\textbackslash}log\_\{10\}(M\_\{{\textbackslash}ast\}/\{{\textbackslash}rm M\}\_\{{\textbackslash}odot\}) {\textbackslash}approx 9.8\$-\$11.3\$ galaxies at \$z
{\textbackslash}approx 0.05\$. Most of our synthetic images were created with the SKIRT
radiative transfer code, including the effects of dust attenuation and
scattering, and performing the radiative transfer directly on the
Voronoi mesh used by the simulations themselves. We have analysed both
our synthetic and real Pan-STARRS images with the newly developed
\${\textbackslash}tt\{statmorph\}\$ code, which calculates non-parametric morphological
diagnostics -- including the Gini-\$M\_\{20\}\$ and
concentration-asymmetry-smoothness (CAS) statistics -- and performs
two-dimensional S{\textbackslash}'\{e\}rsic fits. Overall, we find that the optical
morphologies of IllustrisTNG galaxies are in good agreement with
observations, and represent a substantial improvement compared to the
original Illustris simulation. In particular, the locus of the
Gini-\$M\_\{20\}\$ diagram is consistent with that inferred from
observations, while the median trends with stellar mass of all the
morphological, size and shape parameters considered in this work lie
within the \${\textbackslash}sim\$1\${\textbackslash}sigma\$ scatter of the observational trends. However,
the IllustrisTNG model has some difficulty with more stringent tests,
such as producing a strong morphology-colour relation. This results in a
somewhat higher fraction of red discs and blue spheroids compared to
observations. Similarly, the morphology-size relation is problematic:
while observations show that discs tend to be larger than spheroids at a
fixed stellar mass, such a trend is not present in IllustrisTNG.},
urldate = {2018-09-25},
journal = {ArXiv e-prints},
author = {Rodriguez-Gomez, Vicente and Snyder, Gregory F. and Lotz, Jennifer M. and Nelson, Dylan and Pillepich, Annalisa and Springel, Volker and Genel, Shy and Weinberger, Rainer and Tacchella, Sandro and Pakmor, Ruediger and Torrey, Paul and Marinacci, Federico and Vogelsberger, Mark and Hernquist, Lars and Thilker, David A.},
month = sep,
year = {2018},
keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
pages = {arXiv:1809.08239},
}
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A."],"bibdata":{"bibtype":"article","type":"article","title":"The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations","volume":"1809","shorttitle":"The optical morphologies of galaxies in the IllustrisTNG simulation","url":"http://adsabs.harvard.edu/abs/2018arXiv180908239R","abstract":"We have generated synthetic images of \\${\\textbackslash}sim\\$27,000 galaxies from the IllustrisTNG and the original Illustris hydrodynamic cosmological simulations, designed to match Pan-STARRS observations of \\${\\textbackslash}log_\\{10\\}(M_\\{{\\textbackslash}ast\\}/\\{{\\textbackslash}rm M\\}_\\{{\\textbackslash}odot\\}) {\\textbackslash}approx 9.8\\$-\\$11.3\\$ galaxies at \\$z {\\textbackslash}approx 0.05\\$. Most of our synthetic images were created with the SKIRT radiative transfer code, including the effects of dust attenuation and scattering, and performing the radiative transfer directly on the Voronoi mesh used by the simulations themselves. We have analysed both our synthetic and real Pan-STARRS images with the newly developed \\${\\textbackslash}tt\\{statmorph\\}\\$ code, which calculates non-parametric morphological diagnostics – including the Gini-\\$M_\\{20\\}\\$ and concentration-asymmetry-smoothness (CAS) statistics – and performs two-dimensional S\\textbackslash'\\e\\rsic fits. Overall, we find that the optical morphologies of IllustrisTNG galaxies are in good agreement with observations, and represent a substantial improvement compared to the original Illustris simulation. In particular, the locus of the Gini-\\$M_\\{20\\}\\$ diagram is consistent with that inferred from observations, while the median trends with stellar mass of all the morphological, size and shape parameters considered in this work lie within the \\${\\textbackslash}sim\\$1\\${\\textbackslash}sigma\\$ scatter of the observational trends. However, the IllustrisTNG model has some difficulty with more stringent tests, such as producing a strong morphology-colour relation. This results in a somewhat higher fraction of red discs and blue spheroids compared to observations. Similarly, the morphology-size relation is problematic: while observations show that discs tend to be larger than spheroids at a fixed stellar mass, such a trend is not present in IllustrisTNG.","urldate":"2018-09-25","journal":"ArXiv e-prints","author":[{"propositions":[],"lastnames":["Rodriguez-Gomez"],"firstnames":["Vicente"],"suffixes":[]},{"propositions":[],"lastnames":["Snyder"],"firstnames":["Gregory","F."],"suffixes":[]},{"propositions":[],"lastnames":["Lotz"],"firstnames":["Jennifer","M."],"suffixes":[]},{"propositions":[],"lastnames":["Nelson"],"firstnames":["Dylan"],"suffixes":[]},{"propositions":[],"lastnames":["Pillepich"],"firstnames":["Annalisa"],"suffixes":[]},{"propositions":[],"lastnames":["Springel"],"firstnames":["Volker"],"suffixes":[]},{"propositions":[],"lastnames":["Genel"],"firstnames":["Shy"],"suffixes":[]},{"propositions":[],"lastnames":["Weinberger"],"firstnames":["Rainer"],"suffixes":[]},{"propositions":[],"lastnames":["Tacchella"],"firstnames":["Sandro"],"suffixes":[]},{"propositions":[],"lastnames":["Pakmor"],"firstnames":["Ruediger"],"suffixes":[]},{"propositions":[],"lastnames":["Torrey"],"firstnames":["Paul"],"suffixes":[]},{"propositions":[],"lastnames":["Marinacci"],"firstnames":["Federico"],"suffixes":[]},{"propositions":[],"lastnames":["Vogelsberger"],"firstnames":["Mark"],"suffixes":[]},{"propositions":[],"lastnames":["Hernquist"],"firstnames":["Lars"],"suffixes":[]},{"propositions":[],"lastnames":["Thilker"],"firstnames":["David","A."],"suffixes":[]}],"month":"September","year":"2018","keywords":"Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics","pages":"arXiv:1809.08239","bibtex":"@article{rodriguez-gomez_optical_2018,\n\ttitle = {The optical morphologies of galaxies in the {IllustrisTNG} simulation: a comparison to {Pan}-{STARRS} observations},\n\tvolume = {1809},\n\tshorttitle = {The optical morphologies of galaxies in the {IllustrisTNG} simulation},\n\turl = {http://adsabs.harvard.edu/abs/2018arXiv180908239R},\n\tabstract = {We have generated synthetic images of \\${\\textbackslash}sim\\$27,000 galaxies from the \nIllustrisTNG and the original Illustris hydrodynamic cosmological\nsimulations, designed to match Pan-STARRS observations of\n\\${\\textbackslash}log\\_\\{10\\}(M\\_\\{{\\textbackslash}ast\\}/\\{{\\textbackslash}rm M\\}\\_\\{{\\textbackslash}odot\\}) {\\textbackslash}approx 9.8\\$-\\$11.3\\$ galaxies at \\$z\n{\\textbackslash}approx 0.05\\$. Most of our synthetic images were created with the SKIRT\nradiative transfer code, including the effects of dust attenuation and\nscattering, and performing the radiative transfer directly on the\nVoronoi mesh used by the simulations themselves. We have analysed both\nour synthetic and real Pan-STARRS images with the newly developed\n\\${\\textbackslash}tt\\{statmorph\\}\\$ code, which calculates non-parametric morphological\ndiagnostics -- including the Gini-\\$M\\_\\{20\\}\\$ and\nconcentration-asymmetry-smoothness (CAS) statistics -- and performs\ntwo-dimensional S{\\textbackslash}'\\{e\\}rsic fits. Overall, we find that the optical\nmorphologies of IllustrisTNG galaxies are in good agreement with\nobservations, and represent a substantial improvement compared to the\noriginal Illustris simulation. In particular, the locus of the\nGini-\\$M\\_\\{20\\}\\$ diagram is consistent with that inferred from\nobservations, while the median trends with stellar mass of all the\nmorphological, size and shape parameters considered in this work lie\nwithin the \\${\\textbackslash}sim\\$1\\${\\textbackslash}sigma\\$ scatter of the observational trends. However,\nthe IllustrisTNG model has some difficulty with more stringent tests,\nsuch as producing a strong morphology-colour relation. This results in a\nsomewhat higher fraction of red discs and blue spheroids compared to\nobservations. 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