从HUDF09、ERS和CANDELS数据中对z~10 Galerkin的扩展搜索：z>8时加速演化的证据？
Expanded Search for z~10 Galaxies from HUDF09, ERS, and CANDELS Data: Evidence for Accelerated Evolution at z>8?
摘要：
我们使用公开的HUDF 09、ERS和CANDELS巡天，在钱德拉深空南部的~160弧分^2的WFC 3/IR数据中搜索z~10星系，在H_（160）AB mag. z>~9.5范围内5 σ深度范围内，通过J_（125）-H_（160）>1.2的颜色和J_（125）蓝向的任何带的未检测，确定了候选星系。125. Spitzer IRAC测光是将真正的高z候选星系与具有演化或严重尘埃遮蔽的恒星星族的中等红移（z~2-4）星系分离的关键。在去除了16个中等亮度（H_160~24-26等）的强IRAC探测源之后，我们在整个数据集中只发现了一个可能的z~10星系候选者，这是Bouwens等人（2011）之前报道的。新的数据覆盖了3倍大的区域，并对紫外光度函数（LF）的演变提供了更强的约束。如果将z~4-8的低频演化外推到z~10，则在我们的数据中预计有6个z~10星系。只有一个源的检测表明，UV LF在z~8之前以加速的速率演化。从z~10到z~8，仅在1.7亿年内，光度密度就增加了一个数量级以上。这一增加比从紫外线低频的较低红移外推所预期的要大>= 4倍。因此，我们很可能在宇宙再电离的中心见证了星系的第一次快速积聚。未来的深度HST WFC 3/IR数据，达到远超过29等，可以实现z~10附近的加速演化的更稳健的量化。
英文摘要：
We search for z~10 galaxies over ~160 arcmin^2 of WFC3/IR data in the Chandra Deep Field South, using the public HUDF09, ERS, and CANDELS surveys, that reach to 5sigma depths ranging from 26.9 to 29.4 in H_160 AB mag. z>~9.5 galaxy candidates are identified via J_125-H_160>1.2 colors and non-detections in any band blueward of J_125. Spitzer IRAC photometry is key for separating the genuine high-z candidates from intermediate redshift (z~2-4) galaxies with evolved or heavily dust obscured stellar populations. After removing 16 sources of intermediate brightness (H_160~24-26 mag) with strong IRAC detections, we only find one plausible z~10 galaxy candidate in the whole data set, previously reported in Bouwens et al. (2011). The newer data cover a 3x larger area and provide much stronger constraints on the evolution of the UV luminosity function (LF). If the evolution of the z~4-8 LFs is extrapolated to z~10, six z~10 galaxies are expected in our data. The detection of only one source suggests that the UV LF evolves at an accelerated rate before z~8. The luminosity density is found to increase by more than an order of magnitude in only 170 Myr from z~10 to z~8. This increase is >=4x larger than expected from the lower redshift extrapolation of the UV LF. We are thus likely witnessing the first rapid build-up of galaxies in the heart of cosmic reionization. Future deep HST WFC3/IR data, reaching to well beyond 29 mag, can enable a more robust quantification of the accelerated evolution around z~10.
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