J.J.A. Matthee
A 10 deg^2 Lyman α survey at z=8.8 with spectroscopic follow-up: strong constraints on the luminosity function and implications for other surveys
Matthee, J.J.A.; Sobral, D.; Swinbank, A.M.; Smail, I.; Best, P.N.; Kim, J.-W.; Franx, M.; Milvang-Jensen, B.; Fynbo, J.
Authors
D. Sobral
Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
P.N. Best
J.-W. Kim
M. Franx
B. Milvang-Jensen
J. Fynbo
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.
Citation
Matthee, J., Sobral, D., Swinbank, A., Smail, I., Best, P., Kim, J., …Fynbo, J. (2014). A 10 deg^2 Lyman α survey at z=8.8 with spectroscopic follow-up: strong constraints on the luminosity function and implications for other surveys. Monthly Notices of the Royal Astronomical Society, 440(3), 2375-2387. https://doi.org/10.1093/mnras/stu392
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 26, 2014 |
Publication Date | May 1, 2014 |
Deposit Date | Apr 15, 2014 |
Publicly Available Date | Jun 20, 2014 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 440 |
Issue | 3 |
Pages | 2375-2387 |
DOI | https://doi.org/10.1093/mnras/stu392 |
Keywords | Galaxies: evolution, Galaxies: high-redshift, Cosmology: observations, Dark ages, Reionization, First stars. |
Public URL | https://durham-repository.worktribe.com/output/1466711 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
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