%0 Generic %1 wold2021lager %A Wold, Isak G. B. %A Malhotra, Sangeeta %A Rhoads, James %A Wang, Junxian %A Hu, Weida %A Perez, Lucia A. %A Zheng, Zhen-Ya %A Khostovan, Ali Ahmad %A Walker, Alistair R. %A Barrientos, L. Felipe %A González-López, Jorge %A Harish, Santosh %A Infante, Leopoldo %A Jiang, Chunyan %A Pharo, John %A Moya-Sierralta, Cristóbal %A Valdes, Francisco %A Yang, Huan %D 2021 %K library %T LAGER Ly$\alpha$ Luminosity Function at $z\sim7$, Implications for Reionization %U http://arxiv.org/abs/2105.12191 %X We present a new measurement of the Ly$\alpha$ luminosity function at redshift $z=6.9$, finding moderate evolution from $z=5.7$ that is consistent with a fully or largely ionized $z\sim7$ intergalactic medium. Our result is based on four fields of the LAGER (Lyman Alpha Galaxies in the Epoch of Reionization) project. Our survey volume of $6.1\times10^6$ Mpc$^3$ is double that of the next largest $z7$ survey. We combine two new LAGER fields (WIDE12 and GAMA15A) with two previously reported LAGER fields (COSMOS and CDFS). In the new fields, we identify $N=95$ new $z=6.9$ Ly$\alpha$ emitters (LAEs); characterize our survey's completeness and reliability; and compute Ly$\alpha$ luminosity functions. The best-fit Schechter luminosity function parameters for all four LAGER fields are in good general agreement. Two fields (COSMOS and WIDE12) show evidence for a bright-end excess above the Schechter function fit. We find that the Ly$\alpha$ luminosity density declines at the same rate as the UV continuum LF from $z=5.7$ to $z=6.9$. This is consistent with an intergalactic medium that was fully ionized as early as redshift $z7$, or with a volume-averaged neutral hydrogen fraction of $x_HI < 0.33$ at $1\sigma$.

@misc{wold2021lager, abstract = {We present a new measurement of the Ly$\alpha$ luminosity function at redshift $z=6.9$, finding moderate evolution from $z=5.7$ that is consistent with a fully or largely ionized $z\sim7$ intergalactic medium. Our result is based on four fields of the LAGER (Lyman Alpha Galaxies in the Epoch of Reionization) project. Our survey volume of $6.1\times10^{6}$ Mpc$^{3}$ is double that of the next largest $z\sim 7$ survey. We combine two new LAGER fields (WIDE12 and GAMA15A) with two previously reported LAGER fields (COSMOS and CDFS). In the new fields, we identify $N=95$ new $z=6.9$ Ly$\alpha$ emitters (LAEs); characterize our survey's completeness and reliability; and compute Ly$\alpha$ luminosity functions. The best-fit Schechter luminosity function parameters for all four LAGER fields are in good general agreement. Two fields (COSMOS and WIDE12) show evidence for a bright-end excess above the Schechter function fit. We find that the Ly$\alpha$ luminosity density declines at the same rate as the UV continuum LF from $z=5.7$ to $z=6.9$. This is consistent with an intergalactic medium that was fully ionized as early as redshift $z\sim 7$, or with a volume-averaged neutral hydrogen fraction of $x_{HI} < 0.33$ at $1\sigma$.}, added-at = {2021-05-27T05:43:44.000+0200}, author = {Wold, Isak G. B. and Malhotra, Sangeeta and Rhoads, James and Wang, Junxian and Hu, Weida and Perez, Lucia A. and Zheng, Zhen-Ya and Khostovan, Ali Ahmad and Walker, Alistair R. and Barrientos, L. Felipe and González-López, Jorge and Harish, Santosh and Infante, Leopoldo and Jiang, Chunyan and Pharo, John and Moya-Sierralta, Cristóbal and Valdes, Francisco and Yang, Huan}, biburl = {https://www.bibsonomy.org/bibtex/2741e95b4021e916df1e583968bede705/gpkulkarni}, description = {LAGER Ly$\alpha$ Luminosity Function at $z\sim7$, Implications for Reionization}, interhash = {3f699b97d4a1386e4e690509327947b2}, intrahash = {741e95b4021e916df1e583968bede705}, keywords = {library}, note = {cite arxiv:2105.12191Comment: 18 pages, 11 figures; 1st revision submitted to ApJ}, timestamp = {2021-05-27T05:43:44.000+0200}, title = {LAGER Ly$\alpha$ Luminosity Function at $z\sim7$, Implications for Reionization}, url = {http://arxiv.org/abs/2105.12191}, year = 2021 }