\\textbackslashsc Mufasa\:The strength and evolution of galaxy conformity in various tracers. Rafieferantsoa, M. & Davé, R. arXiv:1707.01950 [astro-ph], July, 2017. arXiv: 1707.01950
Paper abstract bibtex We investigate galaxy conformity using the \\textbackslashsc Mufasa\\textbackslash cosmological hydrodynamical simulation, which uses a heuristic halo mass-based prescription to quench central galaxies. We show that satellite galaxies are broadly consistent with observations, showing a bimodal distribution in colour with radius, albeit with too many low-mass quenched satellites. In \\textbackslashsc Mufasa\, galaxy conformity is evident in previously observed properties such as colour, specific star formation rate, and \\textbackslashsc Hi\\textbackslash content, as well as in environment, stellar age, H\$_2\$ content, and metallicity. We introduce quantifying conformity using a new measure \$\{{\textbackslash}cal S\}(R)\$, and show that low-mass haloes have weak conformity extending to large projected radii \$R\$ in all properties, while high-mass haloes have strong conformity that diminishes rapidly with \$R\$ and disappears at \$R{\textbackslash}ga 1\$\textasciitildeMpc. \$\{{\textbackslash}cal S\}(R)\$ is strongest for environment in low-mass haloes, and sSFR (or colour) in high-mass haloes, and is dominated by one-halo conformity with the exception of \\textbackslashsc Mufasa\\textbackslash in small haloes. Metallicity shows a curious anti-conformity in massive haloes. Tracking the evolution of conformity for \$z=0\$ galaxies back in time shows that conformity generally emerges as a late-time phenomenon. However, for fixed halo mass bins, conformity is fairly constant with redshift out to \$z{\textbackslash}ga 2\$. These trends are consistent with the idea that strong conformity only emerges once haloes grow above \\textbackslashsc Mufasa\'s quenching mass scale of \${\textbackslash}sim 10{\textasciicircum}\{12\}M_{\textbackslash}odot\$. A quantitative measure of conformity in various properties, along with its evolution, thus represents a new and stringent test of the impact of quenching on environment within current galaxy formation models.
@article{rafieferantsoa_sc_2017,
title = {\{{\textbackslash}sc {Mufasa}\}:{The} strength and evolution of galaxy conformity in various tracers},
shorttitle = {\{{\textbackslash}sc {Mufasa}\}},
url = {http://arxiv.org/abs/1707.01950},
abstract = {We investigate galaxy conformity using the \{{\textbackslash}sc Mufasa\}{\textbackslash} cosmological hydrodynamical simulation, which uses a heuristic halo mass-based prescription to quench central galaxies. We show that satellite galaxies are broadly consistent with observations, showing a bimodal distribution in colour with radius, albeit with too many low-mass quenched satellites. In \{{\textbackslash}sc Mufasa\}, galaxy conformity is evident in previously observed properties such as colour, specific star formation rate, and \{{\textbackslash}sc Hi\}{\textbackslash} content, as well as in environment, stellar age, H\$\_2\$ content, and metallicity. We introduce quantifying conformity using a new measure \$\{{\textbackslash}cal S\}(R)\$, and show that low-mass haloes have weak conformity extending to large projected radii \$R\$ in all properties, while high-mass haloes have strong conformity that diminishes rapidly with \$R\$ and disappears at \$R{\textbackslash}ga 1\${\textasciitilde}Mpc. \$\{{\textbackslash}cal S\}(R)\$ is strongest for environment in low-mass haloes, and sSFR (or colour) in high-mass haloes, and is dominated by one-halo conformity with the exception of \{{\textbackslash}sc Mufasa\}{\textbackslash} in small haloes. Metallicity shows a curious anti-conformity in massive haloes. Tracking the evolution of conformity for \$z=0\$ galaxies back in time shows that conformity generally emerges as a late-time phenomenon. However, for fixed halo mass bins, conformity is fairly constant with redshift out to \$z{\textbackslash}ga 2\$. These trends are consistent with the idea that strong conformity only emerges once haloes grow above \{{\textbackslash}sc Mufasa\}'s quenching mass scale of \${\textbackslash}sim 10{\textasciicircum}\{12\}M\_{\textbackslash}odot\$. A quantitative measure of conformity in various properties, along with its evolution, thus represents a new and stringent test of the impact of quenching on environment within current galaxy formation models.},
journal = {arXiv:1707.01950 [astro-ph]},
author = {Rafieferantsoa, Mika and Davé, Romeel},
month = jul,
year = {2017},
note = {arXiv: 1707.01950},
keywords = {Astrophysics - Astrophysics of Galaxies},
}
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In \\\\textbackslashsc Mufasa\\, galaxy conformity is evident in previously observed properties such as colour, specific star formation rate, and \\\\textbackslashsc Hi\\\\textbackslash content, as well as in environment, stellar age, H\\$_2\\$ content, and metallicity. We introduce quantifying conformity using a new measure \\$\\{{\\textbackslash}cal S\\}(R)\\$, and show that low-mass haloes have weak conformity extending to large projected radii \\$R\\$ in all properties, while high-mass haloes have strong conformity that diminishes rapidly with \\$R\\$ and disappears at \\$R{\\textbackslash}ga 1\\$\\textasciitildeMpc. \\$\\{{\\textbackslash}cal S\\}(R)\\$ is strongest for environment in low-mass haloes, and sSFR (or colour) in high-mass haloes, and is dominated by one-halo conformity with the exception of \\\\textbackslashsc Mufasa\\\\textbackslash in small haloes. Metallicity shows a curious anti-conformity in massive haloes. Tracking the evolution of conformity for \\$z=0\\$ galaxies back in time shows that conformity generally emerges as a late-time phenomenon. However, for fixed halo mass bins, conformity is fairly constant with redshift out to \\$z{\\textbackslash}ga 2\\$. These trends are consistent with the idea that strong conformity only emerges once haloes grow above \\\\textbackslashsc Mufasa\\'s quenching mass scale of \\${\\textbackslash}sim 10{\\textasciicircum}\\{12\\}M_{\\textbackslash}odot\\$. A quantitative measure of conformity in various properties, along with its evolution, thus represents a new and stringent test of the impact of quenching on environment within current galaxy formation models.","journal":"arXiv:1707.01950 [astro-ph]","author":[{"propositions":[],"lastnames":["Rafieferantsoa"],"firstnames":["Mika"],"suffixes":[]},{"propositions":[],"lastnames":["Davé"],"firstnames":["Romeel"],"suffixes":[]}],"month":"July","year":"2017","note":"arXiv: 1707.01950","keywords":"Astrophysics - Astrophysics of Galaxies","bibtex":"@article{rafieferantsoa_sc_2017,\n\ttitle = {\\{{\\textbackslash}sc {Mufasa}\\}:{The} strength and evolution of galaxy conformity in various tracers},\n\tshorttitle = {\\{{\\textbackslash}sc {Mufasa}\\}},\n\turl = {http://arxiv.org/abs/1707.01950},\n\tabstract = {We investigate galaxy conformity using the \\{{\\textbackslash}sc Mufasa\\}{\\textbackslash} cosmological hydrodynamical simulation, which uses a heuristic halo mass-based prescription to quench central galaxies. We show that satellite galaxies are broadly consistent with observations, showing a bimodal distribution in colour with radius, albeit with too many low-mass quenched satellites. In \\{{\\textbackslash}sc Mufasa\\}, galaxy conformity is evident in previously observed properties such as colour, specific star formation rate, and \\{{\\textbackslash}sc Hi\\}{\\textbackslash} content, as well as in environment, stellar age, H\\$\\_2\\$ content, and metallicity. We introduce quantifying conformity using a new measure \\$\\{{\\textbackslash}cal S\\}(R)\\$, and show that low-mass haloes have weak conformity extending to large projected radii \\$R\\$ in all properties, while high-mass haloes have strong conformity that diminishes rapidly with \\$R\\$ and disappears at \\$R{\\textbackslash}ga 1\\${\\textasciitilde}Mpc. \\$\\{{\\textbackslash}cal S\\}(R)\\$ is strongest for environment in low-mass haloes, and sSFR (or colour) in high-mass haloes, and is dominated by one-halo conformity with the exception of \\{{\\textbackslash}sc Mufasa\\}{\\textbackslash} in small haloes. Metallicity shows a curious anti-conformity in massive haloes. Tracking the evolution of conformity for \\$z=0\\$ galaxies back in time shows that conformity generally emerges as a late-time phenomenon. However, for fixed halo mass bins, conformity is fairly constant with redshift out to \\$z{\\textbackslash}ga 2\\$. 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