A 10 deg2 Lyman α survey at z=8.8 with spectroscopic follow-up: strong constraints on the luminosity function and implications for other surveys
Jorryt Matthee,David Sobral,A. M. Swinbank,Ian Smail,Philip Best,Jae-Woo Kim,Marijn Franx,Bo Milvang-Jensen,Johan P. U. Fynbo +8 more
TLDR
In this article, the CF-HiZELS survey was used to detect Lyman α (Lyα) emitters in the SSA22 field with the Canada-France-Hawaii Telescope (CFHT), and a total of 13 candidates were found, of which two were marked as strong candidates, but the majority have very weak constraints on their spectral energy distributions.Abstract:
Candidate galaxies at redshifts of z ~ 10 are now being found in extremely deep surveys, probing very small areas. As a consequence, candidates are very faint, making spectroscopic confirmation practically impossible. In order to overcome such limitations, we have undertaken the CF-HiZELS survey, which is a large-area, medium-depth near-infrared narrow-band survey targeted at z = 8.8 Lyman α (Lyα) emitters (LAEs) and covering 10 deg2 in part of the SSA22 field with the Canada-France-Hawaii Telescope (CFHT). We surveyed a comoving volume of 4.7 × 106 Mpc3 to a Lyα luminosity limit of 6.3 × 1043 erg s-1. We look for Lyα candidates by applying the following criteria: (i) clear emission-line source, (ii) no optical detections (ugriz from CFHTLS), (iii) no visible detection in the optical stack (ugriz > 27), (iv) visually checked reliable NBJ and J detections and (v) J - K ≤ 0. We compute photometric redshifts and remove a significant amount of dusty lower redshift line-emitters at z ~ 1.4 or 2.2. A total of 13 Lyα candidates were found, of which two are marked as strong candidates, but the majority have very weak constraints on their spectral energy distributions. Using follow-up observations with SINFONI/VLT, we are able to exclude the most robust candidates as LAEs. We put a strong constraint on the Lyα luminosity function at z ~ 9 and make realistic predictions for ongoing and future surveys. Our results show that surveys for the highest redshift LAEs are susceptible of multiple contaminations and that spectroscopic follow-up is absolutely necessary.read more
Citations
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Evidence for PopIII-like Stellar Populations in the Most Luminous Lyman-α Emitters at the Epoch of Reionization: Spectroscopic Confirmation
David Sobral,David Sobral,Jorryt Matthee,Behnam Darvish,Daniel Schaerer,Daniel Schaerer,Bahram Mobasher,Huub Röttgering,Sergio Da Graça Santos,Shoubaneh Hemmati +9 more
TL;DR: In this article, the authors present follow-up observations of the two most luminous z~6.6 Ly$\alpha$ candidates in the COSMOS field: ''MASOSA'' and ''CR7'' to confirm both candidates beyond any doubt.
Journal ArticleDOI
Early galaxy formation and its large-scale effects
Pratika Dayal,Andrea Ferrara +1 more
TL;DR: In this article, the authors combine the information gleaned from different theoretical models/studies to build a coherent picture of the Universe in its early stages which includes the physics of galaxy formation along with the impact that early structures had on large-scale processes such as cosmic reionization and metal enrichment of the intergalactic medium.
Journal ArticleDOI
Identification of the brightest Lyα emitters at z = 6.6: implications for the evolution of the luminosity function in the reionization era
Jorryt Matthee,David Sobral,David Sobral,Sergio Da Graça Santos,Huub Röttgering,Behnam Darvish,Bahram Mobasher +6 more
TL;DR: In this paper, a new measurement of the z = 6.6 Lymanα emitter (LAE) luminosity function (LF) was provided, which constrained the bright end for the first time.
Journal ArticleDOI
Accelerated Evolution of Ly$\alpha$ Luminosity Function at $\textit{z} \gtrsim 7$ Revealed by the Subaru Ultra-Deep Survey for Ly$\alpha$ Emitters at $\textit{z}=7.3$
Akira Konno,Masami Ouchi,Yoshiaki Ono,Kazuhiro Shimasaku,Takatoshi Shibuya,Hisanori Furusawa,Kimihiko Nakajima,Yoshiaki Naito,Rieko Momose,Suraphong Yuma,Masanori Iye +10 more
TL;DR: In this article, the ultra-deep Subaru narrowband imaging survey for Lya emitters (LAEs) at $z=7.3$ in SXDS and COSMOS fields with a total integration time of 106 hours.
Journal ArticleDOI
Accelerated Evolution of the Lyα Luminosity Function at z >~ 7 Revealed by the Subaru Ultra-deep Survey for Lyα Emitters at z = 7.3
Akira Konno,Masami Ouchi,Masami Ouchi,Yoshiaki Ono,Kazuhiro Shimasaku,Takatoshi Shibuya,Takatoshi Shibuya,Hisanori Furusawa,Kimihiko Nakajima,Yoshiaki Naito,Rieko Momose,Suraphong Yuma,Masanori Iye +12 more
TL;DR: In this article, the authors presented the ultra-deep Subaru narrowband imaging survey for Lyα emitters (LAEs) at z = 7.3 in the XMM-Newton Deep Survey (SXDS) and Cosmic Evolution Survey (COSMOS) fields with a total integration time of 106 hr.
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