Following the Cosmic Evolution of Pristine Gas II: The search for Pop III-Bright Galaxies. Sarmento, R., Scannapieco, E., & Cohen, S. ArXiv e-prints, 1710:arXiv:1710.09878, October, 2017.
Following the Cosmic Evolution of Pristine Gas II: The search for Pop III-Bright Galaxies [link]Paper  abstract   bibtex   
Direct observational searches for Population III (Pop III) stars at high-redshift are faced with the question of how to select the most promising targets for spectroscopic follow up. To help answer this, we use a large-scale cosmological simulation, augmented with a new subgrid model that tracks the fraction of pristine gas, to follow the evolution of high-redshift galaxies and the Pop III stars they contain. We generate rest-frame ultraviolet (UV) luminosity functions for our galaxies and find that they are consistent with current \$z {\textbackslash}ge 7 \$ observations. Throughout the redshift range \$7 {\textbackslash}le z {\textbackslash}le 16\$ we identify 'Pop III-bright' galaxies as those with at least 75% of their flux coming from Pop III stars. While less than 5% of galaxies brighter than \$m_\{{\textbackslash}rm UV, AB\} = 31.4\$ mag are Pop III-bright between \$7{\textbackslash}leq z {\textbackslash}leq8\$, roughly a third of such galaxies are Pop III-bright at \$z=9\$, right before reionization occurs in our simulation. Moving to \$z=10\$, \$m_\{p̌hantom{\}}{\textbackslash}rm UV, ABp̌hantom{\{}\} = 31.4\$ mag corresponds to more luminous galaxies and the Pop III-bright fraction falls off to 15%. Finally at the highest redshifts, a large fraction of all galaxies are Pop III-bright regardless of magnitude. While \$m_\{{\textbackslash}rm UV, AB\} = 31.4\$ mag galaxies are likely not detectable during this epoch, we find 90% of galaxies at \$z = 16\$ are Pop III-bright with \$m_\{{\textbackslash}rm UV, AB\} {\textbackslash}le 33\$ mag, a lensed magnitude limit within reach of the James Webb Space Telescope. Thus we predict that the best redshift to search for luminous Pop III-bright galaxies is just before reionization, while lensing surveys for fainter galaxies should push to the highest redshifts possible.
@article{sarmento_following_2017,
	title = {Following the {Cosmic} {Evolution} of {Pristine} {Gas} {II}: {The} search for {Pop} {III}-{Bright} {Galaxies}},
	volume = {1710},
	shorttitle = {Following the {Cosmic} {Evolution} of {Pristine} {Gas} {II}},
	url = {http://adsabs.harvard.edu/abs/2017arXiv171009878S},
	abstract = {Direct observational searches for Population III (Pop III) stars at 
high-redshift are faced with the question of how to select the most
promising targets for spectroscopic follow up. To help answer this, we
use a large-scale cosmological simulation, augmented with a new subgrid
model that tracks the fraction of pristine gas, to follow the evolution
of high-redshift galaxies and the Pop III stars they contain. We
generate rest-frame ultraviolet (UV) luminosity functions for our
galaxies and find that they are consistent with current \$z {\textbackslash}ge 7 \$
observations. Throughout the redshift range \$7 {\textbackslash}le z {\textbackslash}le 16\$ we identify
'Pop III-bright' galaxies as those with at least 75\% of their flux
coming from Pop III stars. While less than 5\% of galaxies brighter than
\$m\_\{{\textbackslash}rm UV, AB\} = 31.4\$ mag are Pop III-bright between \$7{\textbackslash}leq z {\textbackslash}leq8\$,
roughly a third of such galaxies are Pop III-bright at \$z=9\$, right
before reionization occurs in our simulation. Moving to \$z=10\$, \$m\_\{\vphantom{\}}{\textbackslash}rm
UV, AB\vphantom{\{}\} = 31.4\$ mag corresponds to more luminous galaxies and the Pop
III-bright fraction falls off to 15\%. Finally at the highest redshifts,
a large fraction of all galaxies are Pop III-bright regardless of
magnitude. While \$m\_\{{\textbackslash}rm UV, AB\} = 31.4\$ mag galaxies are likely not
detectable during this epoch, we find 90\% of galaxies at \$z = 16\$ are
Pop III-bright with \$m\_\{{\textbackslash}rm UV, AB\} {\textbackslash}le 33\$ mag, a lensed magnitude
limit within reach of the James Webb Space Telescope. Thus we predict
that the best redshift to search for luminous Pop III-bright galaxies is
just before reionization, while lensing surveys for fainter galaxies
should push to the highest redshifts possible.},
	journal = {ArXiv e-prints},
	author = {Sarmento, Richard and Scannapieco, Evan and Cohen, Seth},
	month = oct,
	year = {2017},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:1710.09878},
}

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