D. Sobral
CF-HiZELS, an ∼10 deg2 emission-line survey with spectroscopic follow-up: Hα, [O iii] + Hβ and [O ii] luminosity functions at z = 0.8, 1.4 and 2.2
Sobral, D.; Matthee, J.; Best, P.N.; Smail, I.; Khostovan, A.A.; Milvang-Jensen, B.; Kim, J.-W.; Stott, J.; Calhau, J.; Nayyeri, H.; Mobasher, B.
Authors
J. Matthee
P.N. Best
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
A.A. Khostovan
B. Milvang-Jensen
J.-W. Kim
J. Stott
J. Calhau
H. Nayyeri
B. Mobasher
Abstract
We present results from the largest contiguous narrow-band survey in the near-infrared. We have used the wide-field infrared camera/Canada–France–Hawaii Telescope and the lowOH2 filter (1.187 ± 0.005 μm) to survey ≈10 deg2 of contiguous extragalactic sky in the SA22 field. A total of ∼6000 candidate emission-line galaxies are found. We use deep ugrizJK data to obtain robust photometric redshifts. We combine our data with the High-redshift(Z) Emission Line Survey (HiZELS), explore spectroscopic surveys (VVDS, VIPERS) and obtain our own spectroscopic follow-up with KMOS, FMOS and MOSFIRE to derive large samples of high-redshift emission-line selected galaxies: 3471 Hα emitters at z = 0.8, 1343 [O iii] + Hβ emitters at z = 1.4 and 572 [O ii] emitters at z = 2.2. We probe comoving volumes of >106 Mpc3 and find significant overdensities, including an 8.5σ (spectroscopically confirmed) overdensity of Hα emitters at z = 0.81. We derive Hα, [O iii] + Hβ and [O ii] luminosity functions at z = 0.8, 1.4, 2.2, respectively, and present implications for future surveys such as Euclid. Our uniquely large volumes/areas allow us to subdivide the samples in thousands of randomized combinations of areas and provide a robust empirical measurement of sample/cosmic variance. We show that surveys for star-forming/emission-line galaxies at a depth similar to ours can only overcome cosmic-variance (errors <10 per cent) if they are based on volumes >5 × 105 Mpc3; errors on L* and ϕ* due to sample (cosmic) variance on surveys probing ∼104 and ∼105 Mpc3 are typically very high: ∼300 and ∼40–60 per cent, respectively.
Citation
Sobral, D., Matthee, J., Best, P., Smail, I., Khostovan, A., Milvang-Jensen, B., …Mobasher, B. (2015). CF-HiZELS, an ∼10 deg2 emission-line survey with spectroscopic follow-up: Hα, [O iii] + Hβ and [O ii] luminosity functions at z = 0.8, 1.4 and 2.2. Monthly Notices of the Royal Astronomical Society, 451(3), 2303-2323. https://doi.org/10.1093/mnras/stv1076
Journal Article Type | Article |
---|---|
Acceptance Date | May 11, 2015 |
Publication Date | Aug 11, 2015 |
Deposit Date | Feb 16, 2016 |
Publicly Available Date | Feb 22, 2016 |
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 | 451 |
Issue | 3 |
Pages | 2303-2323 |
DOI | https://doi.org/10.1093/mnras/stv1076 |
Keywords | Galaxies: evolution, Galaxies: formation, Galaxies: luminosity function, mass function, Cosmology: observations, Early Universe, Large-scale structure of Universe. |
Related Public URLs | http://adsabs.harvard.edu/abs/2015MNRAS.451.2303S |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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