arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.06602astro-ph.GAastro-ph.COastro-ph.IM
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CF-HiZELS,10度$^2$发射线巡天,光谱跟踪:Hα、[ OIII ]+Hβ和[ OII ]光度函数,z=0.8、1.4和2.2

CF-HiZELS, a 10 deg$^2$ emission-line survey with spectroscopic follow-up: Hα, [OIII]+Hβ and [OII] luminosity functions at z=0.8, 1.4 and 2.2

David Sobral, Jorryt Matthee, Philip N. Best, Ian Smail, Ali A. Khostovan, Bo Milvang-Jensen, Jae-Woo Kim, John Stott, João Calhau, Hooshang Nayyeri, Bahram Mobasher

摘要:

我们目前的结果,从最大的连续窄带调查在近红外。我们使用WIRCam/CFHT和低OH 2滤光器(1.187 $\pm$ 0.005 $μ$ m)对SA 22视场中~10 deg $^2$的连续河外天空进行了观测。总共发现了约6000个候选发射线星系,我们利用深ugrizJK数据获得了强的光度红移。我们结合我们的数据与高红移发射线调查(HiZELS),探索光谱调查(VVDS,VIPERS),并获得我们自己的光谱后续与KMOS,FMOS和MOSFIRE获得高红移发射线选择星系的大样本:3471 H $α$发射器在z=0.8,1343 [OIII]+H $β$发射器在z=1.4和572 [OII]发射器在z=2.2。我们探测了>10 $^6$ Mpc $^3$的共移动体积,并发现了显著的过密度,包括在z=0.81处H $α$发射体的8.5 $σ$(光谱证实的)过密度。我们分别导出了z= 0.8,1.4,2.2时的H $α$,[OIII]+H $β$和[OII]光度函数,并对今后的观测(如Euclid)提出了启示.我们独特的大体积/区域使我们能够将样本细分为数千个随机区域组合,并提供样本/宇宙方差的可靠经验测量。我们表明,在与我们相似的深度对恒星形成/发射线星系的调查只能克服宇宙方差(误差<10%),如果它们是基于大于5x 10 $^{5}$ Mpc $^{3}$的体积;由于探测约10 $^4$ Mpc $^{3}$和约10 $^5$ Mpc $^{3}$的调查的样本(宇宙)差异,$L^*$和$ϕ^*$的误差通常非常高:分别为~300%和~40- 60%。

英文摘要:

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 $μ$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 ugrizJK data to obtain robust photometric redshifts. We combine our data with the High-redshift 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 H$α$ emitters at z=0.8, 1343 [OIII]+H$β$ 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$σ$ (spectroscopically confirmed) over-density of H$α$ emitters at z=0.81. We derive H$α$, [OIII]+H$β$ 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 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 $ϕ^*$ 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.

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