%0 Generic %1 sobral2015cfhizels %A Sobral, David %A Matthee, Jorryt %A Best, Philip N. %A Smail, Ian %A Khostovan, Ali A. %A Milvang-Jensen, Bo %A Kim, Jae-Woo %A Stott, John %A Calhau, João %A Nayyeri, Hooshang %A Mobasher, Bahram %D 2015 %K emission function lines luminosity %T CF-HiZELS, a 10 deg$^2$ emission-line survey with spectroscopic follow-up: H\alpha, OIII+H\beta\ and OII luminosity functions at z=0.8, 1.4 and 2.2 %U http://arxiv.org/abs/1502.06602 %X We present results from the largest contiguous narrow-band survey in the near-infrared. We have used WIRCam/CFHT and the lowOH2 filter (1.187$\pm$0.005 m) to survey ~10 deg$^2$ of contiguous extragalactic sky in the SA22 field. A total of ~6000 candidate emission-line galaxies are found. We use deep CFHTLS $ugriz$ and UKIDSS DXS $J$ and $K$ data to obtain robust photometric redshifts. We combine our data with HiZELS (COSMOS+UDS) and explore VVDS, VIPERS, KMOS and obtain our own spectroscopic follow-up with FMOS and MOSFIRE to derive large samples of high-redshift emission-line selected galaxies: 3471 H\alpha\ emitters at z=0.8, 1343 OIII+H\beta\ emitters at z=1.4 and 572 OII emitters at z=2.2. We probe co-moving volumes of >10$^6$ Mpc$^3$ and find significant over-densities, including an 8.5\sigma\ (spectroscopically confirmed) over-density of H\alpha\ emitters at z=0.81. We derive H\alpha, OIII+H\beta\ and OII luminosity functions at z=0.8, 1.4 and 2.2, respectively, and present implications for future surveys such as EUCLID. Our uniquely large volumes/areas allow us to sub-divide the samples in thousands of randomised 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%) if they are based on volumes >5x10$^5$ Mpc$^3$; errors on L$^*$ and \Phi$^*$ due to sample (cosmic) variance on surveys probing ~10$^4$ Mpc$^3$ and ~10$^5$ Mpc$^3$ are typically very high: ~300% and ~40-60%, respectively.

@misc{sobral2015cfhizels, abstract = {We present results from the largest contiguous narrow-band survey in the near-infrared. We have used WIRCam/CFHT and the lowOH2 filter (1.187$\pm$0.005 \mu m) to survey ~10 deg$^2$ of contiguous extragalactic sky in the SA22 field. A total of ~6000 candidate emission-line galaxies are found. We use deep CFHTLS $ugriz$ and UKIDSS DXS $J$ and $K$ data to obtain robust photometric redshifts. We combine our data with HiZELS (COSMOS+UDS) and explore VVDS, VIPERS, KMOS and obtain our own spectroscopic follow-up with FMOS and MOSFIRE to derive large samples of high-redshift emission-line selected galaxies: 3471 H\alpha\ emitters at z=0.8, 1343 [OIII]+H\beta\ emitters at z=1.4 and 572 [OII] emitters at z=2.2. We probe co-moving volumes of >10$^6$ Mpc$^3$ and find significant over-densities, including an 8.5\sigma\ (spectroscopically confirmed) over-density of H\alpha\ emitters at z=0.81. We derive H\alpha, [OIII]+H\beta\ and [OII] luminosity functions at z=0.8, 1.4 and 2.2, respectively, and present implications for future surveys such as EUCLID. Our uniquely large volumes/areas allow us to sub-divide the samples in thousands of randomised 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%) if they are based on volumes >5x10$^5$ Mpc$^3$; errors on L$^*$ and \Phi$^*$ due to sample (cosmic) variance on surveys probing ~10${^4}$ Mpc$^3$ and ~10$^5$ Mpc$^3$ are typically very high: ~300% and ~40-60%, respectively.}, added-at = {2015-02-25T10:01:23.000+0100}, author = {Sobral, David and Matthee, Jorryt and Best, Philip N. and Smail, Ian and Khostovan, Ali A. and Milvang-Jensen, Bo and Kim, Jae-Woo and Stott, John and Calhau, João and Nayyeri, Hooshang and Mobasher, Bahram}, biburl = {https://www.bibsonomy.org/bibtex/2f377eaafa4f888244a3295ba464e2791/miki}, description = {[1502.06602] CF-HiZELS, a 10 deg$^2$ emission-line survey with spectroscopic follow-up: H\alpha, [OIII]+H\beta\ and [OII] luminosity functions at z=0.8, 1.4 and 2.2}, interhash = {ae1578c782268028320ed8db2d53a996}, intrahash = {f377eaafa4f888244a3295ba464e2791}, keywords = {emission function lines luminosity}, note = {cite arxiv:1502.06602Comment: 22 pages, 15 figures, submitted to MNRAS}, timestamp = {2015-02-25T10:01:23.000+0100}, title = {CF-HiZELS, a 10 deg$^2$ emission-line survey with spectroscopic follow-up: H\alpha, [OIII]+H\beta\ and [OII] luminosity functions at z=0.8, 1.4 and 2.2}, url = {http://arxiv.org/abs/1502.06602}, year = 2015 }