The clustering of \$z {\textgreater} 7\$ galaxies: Predictions from the BLUETIDES simulation. Bhowmick, A. K., Di Matteo, T., Feng, Y., & Lanusse, F. ArXiv e-prints, 1707:arXiv:1707.02312, July, 2017.
Paper abstract bibtex We study the clustering of galaxies (from \textasciitilde \$0.1\$ to a few tens Mpc scales) at high redshift (\$z{\textgreater}7\$) using the BLUETIDES simulation and compare it to current constraints from Hubble legacy and Hyper Suprime Cam (HSC) fields. BLUETIDES is the largest high resolution cosmological hydrodynamic simulation with a box length of \$400\$ \$Mpc/h\$ and \$0.7\$ trillion particles (\textasciitilde \$3\$ million star forming galaxies). We select galaxies with magnitudes consistent with the observed fields (\textasciitilde \$10{\textasciicircum}5\$ star forming galaxies at \$z\$ \textasciitilde \$8\$) and measure their clustering. The 1-halo term dominates on scales \$r {\textless} 0.1\$ \$Mpc/h\$ (\${\textbackslash}Theta {\textless} 3"\$) with non-linear effect at transition scales between the 1-halo and 2-halo term affecting scales \$0.1 {\textless} r {\textless} 20\$ \$Mpc/h\$ (\$3" {\textless} {\textbackslash}Theta {\textless} 90"\$). The predicted angular clustering amplitude of BLUETIDES galaxies is in good agreement with current measurements. The measured linear bias at \$z = 8\$ is \$7.7 {\textbackslash}pm 0.5\$ (evolving close to linearly with redshift). This is consistent with the inferred bias from observations. The typical halo masses are \$M_H\$ \textasciitilde \$2 {\textbackslash}times 10{\textasciicircum}\{10\}\$ \$M_\{{\textbackslash}odot\}/h\$, which is only slightly lower than that inferred from HOD models used to constrain observed clustering. Using the simulations we show that the current clustering measurements probe the transition between 1-halo to 2-halo regime so non-linear effects are important at all scales. We measure a strong scale dependence in the bias at scales below a few Mpc/h (\${\textbackslash}Theta {\textless} 30"\$). The occupation numbers for satellites in BLUETIDES is somewhat higher than standard HODs adopted in these analyses. That should imply a higher number of galaxies detected by JWST observing these fields. At \$z\$ \textasciitilde \$8\$ BLUETIDES predicts enhanced clustering (by factors \textasciitilde \$2\$) within the 1-halo and 1-halo to 2-halo transition scales as compared to linear HOD models; these differences increase (up to factor \textasciitilde \$10\$) at higher redshifts.
@article{bhowmick_clustering_2017,
title = {The clustering of \$z {\textgreater} 7\$ galaxies: {Predictions} from the {BLUETIDES} simulation},
volume = {1707},
shorttitle = {The clustering of \$z {\textgreater} 7\$ galaxies},
url = {http://adsabs.harvard.edu/abs/2017arXiv170702312B},
abstract = {We study the clustering of galaxies (from {\textasciitilde} \$0.1\$ to a few tens Mpc scales) at high redshift (\$z{\textgreater}7\$) using the BLUETIDES simulation and compare it to current constraints from Hubble legacy and Hyper Suprime Cam (HSC) fields. BLUETIDES is the largest high resolution cosmological hydrodynamic simulation with a box length of \$400\$ \$Mpc/h\$ and \$0.7\$ trillion particles ({\textasciitilde} \$3\$ million star forming galaxies). We select galaxies with magnitudes consistent with the observed fields ({\textasciitilde} \$10{\textasciicircum}5\$ star forming galaxies at \$z\$ {\textasciitilde} \$8\$) and measure their clustering. The 1-halo term dominates on scales \$r {\textless} 0.1\$ \$Mpc/h\$ (\${\textbackslash}Theta {\textless} 3"\$) with non-linear effect at transition scales between the 1-halo and 2-halo term affecting scales \$0.1 {\textless} r {\textless} 20\$ \$Mpc/h\$ (\$3" {\textless}
{\textbackslash}Theta {\textless} 90"\$). The predicted angular clustering amplitude of
BLUETIDES galaxies is in good agreement with current measurements. The measured linear bias at \$z = 8\$ is \$7.7 {\textbackslash}pm 0.5\$ (evolving close to linearly with redshift). This is consistent with the inferred bias from observations. The typical halo masses are \$M\_H\$ {\textasciitilde} \$2 {\textbackslash}times 10{\textasciicircum}\{10\}\$ \$M\_\{{\textbackslash}odot\}/h\$, which is only slightly lower than that inferred from HOD models used to constrain observed clustering. Using the simulations we show that the current clustering measurements probe the transition between 1-halo to 2-halo regime so non-linear effects are important at all scales. We measure a strong scale dependence in the bias at scales below a few Mpc/h (\${\textbackslash}Theta {\textless} 30"\$). The occupation numbers for
satellites in BLUETIDES is somewhat higher than standard HODs adopted in these analyses. That should imply a higher number of galaxies detected by JWST observing these fields. At \$z\$ {\textasciitilde} \$8\$ BLUETIDES predicts enhanced clustering (by factors {\textasciitilde} \$2\$) within the 1-halo and 1-halo to 2-halo transition scales as compared to linear HOD models; these differences increase (up to factor {\textasciitilde} \$10\$) at higher redshifts.},
journal = {ArXiv e-prints},
author = {Bhowmick, Aklant Kumar and Di Matteo, Tiziana and Feng, Yu and Lanusse, Francois},
month = jul,
year = {2017},
keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},
pages = {arXiv:1707.02312},
}
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BLUETIDES is the largest high resolution cosmological hydrodynamic simulation with a box length of \\$400\\$ \\$Mpc/h\\$ and \\$0.7\\$ trillion particles (\\textasciitilde \\$3\\$ million star forming galaxies). We select galaxies with magnitudes consistent with the observed fields (\\textasciitilde \\$10{\\textasciicircum}5\\$ star forming galaxies at \\$z\\$ \\textasciitilde \\$8\\$) and measure their clustering. The 1-halo term dominates on scales \\$r {\\textless} 0.1\\$ \\$Mpc/h\\$ (\\${\\textbackslash}Theta {\\textless} 3\"\\$) with non-linear effect at transition scales between the 1-halo and 2-halo term affecting scales \\$0.1 {\\textless} r {\\textless} 20\\$ \\$Mpc/h\\$ (\\$3\" {\\textless} {\\textbackslash}Theta {\\textless} 90\"\\$). The predicted angular clustering amplitude of BLUETIDES galaxies is in good agreement with current measurements. The measured linear bias at \\$z = 8\\$ is \\$7.7 {\\textbackslash}pm 0.5\\$ (evolving close to linearly with redshift). This is consistent with the inferred bias from observations. The typical halo masses are \\$M_H\\$ \\textasciitilde \\$2 {\\textbackslash}times 10{\\textasciicircum}\\{10\\}\\$ \\$M_\\{{\\textbackslash}odot\\}/h\\$, which is only slightly lower than that inferred from HOD models used to constrain observed clustering. Using the simulations we show that the current clustering measurements probe the transition between 1-halo to 2-halo regime so non-linear effects are important at all scales. We measure a strong scale dependence in the bias at scales below a few Mpc/h (\\${\\textbackslash}Theta {\\textless} 30\"\\$). The occupation numbers for satellites in BLUETIDES is somewhat higher than standard HODs adopted in these analyses. That should imply a higher number of galaxies detected by JWST observing these fields. At \\$z\\$ \\textasciitilde \\$8\\$ BLUETIDES predicts enhanced clustering (by factors \\textasciitilde \\$2\\$) within the 1-halo and 1-halo to 2-halo transition scales as compared to linear HOD models; these differences increase (up to factor \\textasciitilde \\$10\\$) at higher redshifts.","journal":"ArXiv e-prints","author":[{"propositions":[],"lastnames":["Bhowmick"],"firstnames":["Aklant","Kumar"],"suffixes":[]},{"propositions":[],"lastnames":["Di","Matteo"],"firstnames":["Tiziana"],"suffixes":[]},{"propositions":[],"lastnames":["Feng"],"firstnames":["Yu"],"suffixes":[]},{"propositions":[],"lastnames":["Lanusse"],"firstnames":["Francois"],"suffixes":[]}],"month":"July","year":"2017","keywords":"Astrophysics - Cosmology and Nongalactic Astrophysics","pages":"arXiv:1707.02312","bibtex":"@article{bhowmick_clustering_2017,\n\ttitle = {The clustering of \\$z {\\textgreater} 7\\$ galaxies: {Predictions} from the {BLUETIDES} simulation},\n\tvolume = {1707},\n\tshorttitle = {The clustering of \\$z {\\textgreater} 7\\$ galaxies},\n\turl = {http://adsabs.harvard.edu/abs/2017arXiv170702312B},\n\tabstract = {We study the clustering of galaxies (from {\\textasciitilde} \\$0.1\\$ to a few tens Mpc scales) at high redshift (\\$z{\\textgreater}7\\$) using the BLUETIDES simulation and compare it to current constraints from Hubble legacy and Hyper Suprime Cam (HSC) fields. BLUETIDES is the largest high resolution cosmological hydrodynamic simulation with a box length of \\$400\\$ \\$Mpc/h\\$ and \\$0.7\\$ trillion particles ({\\textasciitilde} \\$3\\$ million star forming galaxies). We select galaxies with magnitudes consistent with the observed fields ({\\textasciitilde} \\$10{\\textasciicircum}5\\$ star forming galaxies at \\$z\\$ {\\textasciitilde} \\$8\\$) and measure their clustering. The 1-halo term dominates on scales \\$r {\\textless} 0.1\\$ \\$Mpc/h\\$ (\\${\\textbackslash}Theta {\\textless} 3\"\\$) with non-linear effect at transition scales between the 1-halo and 2-halo term affecting scales \\$0.1 {\\textless} r {\\textless} 20\\$ \\$Mpc/h\\$ (\\$3\" {\\textless}\n{\\textbackslash}Theta {\\textless} 90\"\\$). The predicted angular clustering amplitude of\nBLUETIDES galaxies is in good agreement with current measurements. The measured linear bias at \\$z = 8\\$ is \\$7.7 {\\textbackslash}pm 0.5\\$ (evolving close to linearly with redshift). This is consistent with the inferred bias from observations. The typical halo masses are \\$M\\_H\\$ {\\textasciitilde} \\$2 {\\textbackslash}times 10{\\textasciicircum}\\{10\\}\\$ \\$M\\_\\{{\\textbackslash}odot\\}/h\\$, which is only slightly lower than that inferred from HOD models used to constrain observed clustering. Using the simulations we show that the current clustering measurements probe the transition between 1-halo to 2-halo regime so non-linear effects are important at all scales. We measure a strong scale dependence in the bias at scales below a few Mpc/h (\\${\\textbackslash}Theta {\\textless} 30\"\\$). The occupation numbers for\nsatellites in BLUETIDES is somewhat higher than standard HODs adopted in these analyses. That should imply a higher number of galaxies detected by JWST observing these fields. 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