Mon. Not. R. Astron. Soc., 451, 2303-2323 (2015/August-2)
CF-HiZELS, an ∼ 10 deg2 emission-line survey with spectroscopic follow-up: Hα, [OIII] + Hβ and [OII] 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. and MOBASHER B.
Abstract (from CDS):
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 [Oiii] + Hβ emitters at z = 1.4 and 572 [Oii] 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, [Oiii] + Hβ and [Oii] 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 percent) if they are based on volumes >5x105 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 percent, respectively.
© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)
galaxies: evolution - galaxies: formation - galaxies: luminosity function, mass function - cosmology: observations - early Universe - large-scale structure of Universe
VizieR on-line data:
<Available at CDS (J/MNRAS/451/2303): tablea1.dat>
Table A1: CFHIZELS-SM14-NNNNNN N=6315 among (Nos 4214-338460).
View the reference in ADS