%0 Generic %1 sarmento2017following %A Sarmento, Richard %A Scannapieco, Evan %A Cohen, Seth %D 2017 %K gas popIII pristine %T Following the Cosmic Evolution of Pristine Gas II: The search for Pop III-Bright Galaxies %U http://arxiv.org/abs/1710.09878 %X 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 7 $ observations. Throughout the redshift range $7 z 16$ 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 $m_\rm UV, AB = 31.4$ mag are Pop III-bright between $7z łeq8$, roughly a third of such galaxies are Pop III-bright at $z=9$, right before reionization occurs in our simulation. Moving to $z=10$, $m_UV, AB = 31.4$ 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 $m_UV, AB = 31.4$ mag galaxies are likely not detectable during this epoch, we find 90% of galaxies at $z = 16$ are Pop III-bright with $m_UV, AB 33$ 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.

@misc{sarmento2017following, 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 \ge 7 $ observations. Throughout the redshift range $7 \le z \le 16$ 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 $m_{\rm UV, AB} = 31.4$ mag are Pop III-bright between $7\leq z \leq8$, roughly a third of such galaxies are Pop III-bright at $z=9$, right before reionization occurs in our simulation. Moving to $z=10$, $m_{\rm UV, AB} = 31.4$ 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 $m_{\rm UV, AB} = 31.4$ mag galaxies are likely not detectable during this epoch, we find 90% of galaxies at $z = 16$ are Pop III-bright with $m_{\rm UV, AB} \le 33$ 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.}, added-at = {2017-10-30T10:06:23.000+0100}, author = {Sarmento, Richard and Scannapieco, Evan and Cohen, Seth}, biburl = {https://www.bibsonomy.org/bibtex/264a2ef1fa5648ce19d64e2076b76a6c9/miki}, description = {[1710.09878] Following the Cosmic Evolution of Pristine Gas II: The search for Pop III-Bright Galaxies}, interhash = {e060d110d13f1ac95a33cea0a3bf6d7d}, intrahash = {64a2ef1fa5648ce19d64e2076b76a6c9}, keywords = {gas popIII pristine}, note = {cite arxiv:1710.09878Comment: Submitted to ApJ, Comments welcome, 17 pages with Appendix, 8 figures, 1 table}, timestamp = {2017-10-30T10:06:23.000+0100}, title = {Following the Cosmic Evolution of Pristine Gas II: The search for Pop III-Bright Galaxies}, url = {http://arxiv.org/abs/1710.09878}, year = 2017 }