%0 Generic %1 zheng2016lymanalpha %A Zheng, Zhen-Ya %A Malhotra, Sangeeta %A Rhoads, James E. %A Finkelstein, Steven L. %A Wang, Jun-Xian %A Jiang, Chun-Yan %A Cai, Zheng %D 2016 %K emitters lya structures %T Lyman-Alpha Emitter Galaxies at z ~ 2.8 in the Extended Chandra Deep Field-South: I. Tracing the Large-Scale Structure via Lyman-Alpha Imaging %U http://arxiv.org/abs/1606.07073 %X We present a narrowband survey with three adjacent filters for z=2.8--2.9 Lyman Alpha Emitter (LAE) galaxies in the Extended Chandra Deep Field South (ECDFS), along with spectroscopic followup. With a complete sample of 96 LAEs in the narrowband NB466, we confirm a large-scale structure at z~ 2.8. Compared to the blank field in NB470 and NB475, the LAE density excess in the NB466 field is ~6.0+/-0.8 times the standard deviation expected at z~2.8, assuming a linear bias of 2. The overdense large scale structure in NB466 can be decomposed into 4 protoclusters, whose overdensities are 4.6 - 6.6. These 4 protoclusters are expected to evolve into a Coma-like cluster at z~ 0. In the meanwhile, we investigate the average star-formation rates derived from Ly\alpha, rest-frame UV and X-ray, the Ly\alpha luminosity functions, the Ly\alpha photon densities and their dependence on the environment. We find that the Ly\alpha photon density in the overdense field (NB466) is ~50\% higher than that in the blank field (NB470+NB475). The 3 brightest LAEs, including a quasar at z=2.81, are all detected in X-ray and in NB466. These three LAE-AGNs contribute an extra 20--30\% Ly\alpha photon density. Furthermore, we find that LAEs in overdense regions are younger and less dusty. We conclude that the structure we found is a significant and rare density peak, and narrowband imaging is an efficient method to detect and study such structures in the high-z universe.

@misc{zheng2016lymanalpha, abstract = {We present a narrowband survey with three adjacent filters for z=2.8--2.9 Lyman Alpha Emitter (LAE) galaxies in the Extended Chandra Deep Field South (ECDFS), along with spectroscopic followup. With a complete sample of 96 LAEs in the narrowband NB466, we confirm a large-scale structure at z~ 2.8. Compared to the blank field in NB470 and NB475, the LAE density excess in the NB466 field is ~6.0+/-0.8 times the standard deviation expected at z~2.8, assuming a linear bias of 2. The overdense large scale structure in NB466 can be decomposed into 4 protoclusters, whose overdensities are 4.6 - 6.6. These 4 protoclusters are expected to evolve into a Coma-like cluster at z~ 0. In the meanwhile, we investigate the average star-formation rates derived from Ly{\alpha}, rest-frame UV and X-ray, the Ly{\alpha} luminosity functions, the Ly{\alpha} photon densities and their dependence on the environment. We find that the Ly{\alpha} photon density in the overdense field (NB466) is ~50\% higher than that in the blank field (NB470+NB475). The 3 brightest LAEs, including a quasar at z=2.81, are all detected in X-ray and in NB466. These three LAE-AGNs contribute an extra 20--30\% Ly{\alpha} photon density. Furthermore, we find that LAEs in overdense regions are younger and less dusty. We conclude that the structure we found is a significant and rare density peak, and narrowband imaging is an efficient method to detect and study such structures in the high-z universe.}, added-at = {2016-06-24T08:43:39.000+0200}, author = {Zheng, Zhen-Ya and Malhotra, Sangeeta and Rhoads, James E. and Finkelstein, Steven L. and Wang, Jun-Xian and Jiang, Chun-Yan and Cai, Zheng}, biburl = {https://www.bibsonomy.org/bibtex/2752ff91e2fae9d595fd3f31770ba6d92/miki}, description = {[1606.07073] Lyman-Alpha Emitter Galaxies at z ~ 2.8 in the Extended Chandra Deep Field-South: I. Tracing the Large-Scale Structure via Lyman-Alpha Imaging}, interhash = {5efcc942deedaa4c71ea1dc501ccbf9d}, intrahash = {752ff91e2fae9d595fd3f31770ba6d92}, keywords = {emitters lya structures}, note = {cite arxiv:1606.07073Comment: 22 pages, 20 figures, 5 tables. Accepted to ApJ Supplement}, timestamp = {2016-06-24T08:43:39.000+0200}, title = {Lyman-Alpha Emitter Galaxies at z ~ 2.8 in the Extended Chandra Deep Field-South: I. Tracing the Large-Scale Structure via Lyman-Alpha Imaging}, url = {http://arxiv.org/abs/1606.07073}, year = 2016 }