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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.

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 Thumbnail


Authors

D. Sobral

J. Matthee

P.N. Best

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 Mar 29, 2024
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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