z ∼ 7 GALAXY CANDIDATES FROM NICMOS OBSERVATIONS OVER THE HDF-SOUTH AND THE CDF-SOUTH AND HDF-NORTH GOODS FIELDS
z ∼ 7 GALAXY CANDIDATES FROM NICMOS OBSERVATIONS OVER THE HDF-SOUTH AND THE CDF-SOUTH AND HDF-NORTH GOODS FIELDS
复制标题
z ≤ 7 来自 HDF-South、CDF-South 和 HDF-North 货物场 NICMOS 观测的候选星系
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Wei Zheng
中科院分区：
文献类型：
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作者：
R. Bouwens;G. Illingworth;V. González;I. Labbé;M. Franx;C. Conselice;J. Blakeslee;P. V. van Dokkum;B. Holden;D. Magee;D. Marchesini;Wei Zheng
我们使用了两个GOODS场和HDF-South上的1088弧分2深（5σ时为1026.5等）的NICMOS数据来搜索明亮的z ≥ 7星系候选者。这种搜索利用了NICMOS H160波段数据的58弧分2以上的有效预选，其中只有合理的z ≥ 7候选者才能用NICMOS J110波段观测进行跟踪。在搜索中还考虑了248 arcmin ~ 2的深地基近红外数据（25.5mag，5σ）。总的来说，我们在这个领域报告了15个z 850-dropout候选者-其中7个是这些搜索领域的新成员。也发现了两个可能的z <$9 J110-dropout候选星系，但似乎不太可能对应于z <$9星系（考虑到估计的污染水平）。目前的z 109搜索用于设置此类源的流行率的上限。严格的测试进行，以建立我们的选择光度散射，低质量的恒星，超新星和虚假来源的污染水平。我们的z 107选择的估计污染率为1024%。通过仔细的模拟，我们估计了z = 7的有效体积，并将其用于建立对这些搜索中发光星系（L*z = 3，或10 - 21等）体积密度的约束。我们发现，在z = 7的明亮恒星形成星系的体积密度比z = 4的低13+8−5倍，在z = 9的体积密度比z = 4的低25倍以上（1σ）。这是迄今为止对z = 9时的星系体积密度的最严格的限制。目前的广域、多领域搜索将宇宙变化限制在20%左右。我们在UV LF的明亮端发现的演变与最近斯巴鲁Suprime-Cam，HAWK-I或ERS WFC 3/IR搜索中发现的相似。本论文还包括一个完整的总结，我们的最终z 107 z 850-dropout样本（18名候选人）确定所有NICMOS观测到目前为止（在两个GOODS领域，HUDF，星系团）。
We use ∼88 arcmin2 of deep (≳26.5 mag at 5σ) NICMOS data over the two GOODS fields and the HDF-South to conduct a search for bright z ≳ 7 galaxy candidates. This search takes advantage of an efficient preselection over 58 arcmin2 of NICMOS H160-band data where only plausible z ≳ 7 candidates are followed up with NICMOS J110-band observations. ∼248 arcmin2 of deep ground-based near-infrared data (≳25.5 mag, 5σ) are also considered in the search. In total, we report 15 z850-dropout candidates over this area—7 of which are new to these search fields. Two possible z ∼ 9 J110-dropout candidates are also found, but seem unlikely to correspond to z ∼ 9 galaxies (given the estimated contamination levels). The present z ∼ 9 search is used to set upper limits on the prevalence of such sources. Rigorous testing is undertaken to establish the level of contamination of our selections by photometric scatter, low-mass stars, supernovae, and spurious sources. The estimated contamination rate of our z ∼ 7 selection is ∼24%. Through careful simulations, the effective volume available to our z ≳ 7 selections is estimated and used to establish constraints on the volume density of luminous (L*z = 3, or ∼−21 mag) galaxies from these searches. We find that the volume density of luminous star-forming galaxies at z ∼ 7 is 13+8−5 times lower than at z ∼ 4 and >25 times lower (1σ) at z ∼ 9 than at z ∼ 4. This is the most stringent constraint yet available on the volume density of ≳L*z = 3 galaxies at z ∼ 9. The present wide-area, multi-field search limits cosmic variance to ≲20%. The evolution we find at the bright end of the UV LF is similar to that found from recent Subaru Suprime-Cam, HAWK-I or ERS WFC3/IR searches. The present paper also includes a complete summary of our final z ∼ 7 z850-dropout sample (18 candidates) identified from all NICMOS observations to date (over the two GOODS fields, the HUDF, galaxy clusters).
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.