HST Imaging of the Brightest z ∼ 8–9 Galaxies from UltraVISTA: The Extreme Bright End of the UV Luminosity Function
HST Imaging of the Brightest z ∼ 8–9 Galaxies from UltraVISTA: The Extreme Bright End of the UV Luminosity Function
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UltraVISTA 中最亮 z 〜 8-9 星系的 HST 成像：紫外光度函数的极亮端
DOI：
10.3847/1538-4357/aa9a40
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
D. Magee
中科院分区：
文献类型：
--
作者：
M. Stefanon;I. Labb'e;R. Bouwens;G. Brammer;P. Oesch;M. Franx;J. Fynbo;B. Milvang;A. Muzzin;G. Illingworth;O. Fèvre;K. Caputi;B. Holwerda;H. McCracken;R. Smit;D. Magee
我们报告发现了三个特别明亮的候选星系。五个来源的目标是后续与哈勃太空望远镜（HST）/宽视场相机3（WFC 3），选择了一个更大的样本的16个明亮的（mag）候选莱曼突破星系（LBG）确定超过1.6度2的COSMOS/UltraVISTA领域。通过利用UltraVISTA DR 3发布的深（Y-到- mag，）NIR数据，CFHTLS和Suprime-Cam计划的深地基光学成像，以及结合SMUVS和SPLASH计划观测的Spitzer/IRAC镶嵌，这些被选为Y和J辍学。通过改进的光谱能量分布，现在还包括新的HyperSuprimeCam g-，r-，i-，z-和Y-波段数据，我们确认3/5的星系具有稳健的，与最初的选择一致。剩下的2/5星系有一个名义上的。然而，单独使用HST数据，这些物体存在的可能性增加了。我们测量的平均紫外线连续斜率的三个星系，略蓝比类似发光的坎德尔，但与以前的测量类似发光的星系一致。我们最亮的源的圆形有效半径为0.9 ± 0.3 kpc，类似于以前对明亮星系和明亮星系的测量。最后，将我们的样本扩大到包括在UltraVISTA上识别的六个最亮的LBG（即，包括Labbé等人的其他三个来源）本文首次估计了紫外光度函数极端亮端星系的体积密度。尽管有这个特殊的结果，仍然很大的统计不确定性不允许我们区分谢克特和双幂律形式。
We report on the discovery of three especially bright candidate galaxies. Five sources were targeted for follow-up with the Hubble Space Telescope (HST)/Wide Field Camera 3 (WFC3), selected from a larger sample of 16 bright ( mag) candidate Lyman break galaxies (LBGs) identified over 1.6 degrees2 of the COSMOS/UltraVISTA field. These were selected as Y and J dropouts by leveraging the deep (Y-to- mag, ) NIR data from the UltraVISTA DR3 release, deep ground-based optical imaging from the CFHTLS and Suprime-Cam programs, and Spitzer/IRAC mosaics combining observations from the SMUVS and SPLASH programs. Through the refined spectral energy distributions, which now also include new HyperSuprimeCam g-, r-, i-, z-, and Y-band data, we confirm that 3/5 galaxies have robust , consistent with the initial selection. The remaining 2/5 galaxies have a nominal . However, with HST data alone, these objects have increased probability of being at . We measure mean UV continuum slopes for the three galaxies, marginally bluer than similarly luminous in CANDELS but consistent with previous measurements of similarly luminous galaxies at . The circularized effective radius for our brightest source is 0.9 ± 0.3 kpc, similar to previous measurements for a bright galaxy and bright galaxies. Finally, enlarging our sample to include the six brightest LBGs identified over UltraVISTA (i.e., including three other sources from Labbé et al.) we estimate for the first time the volume density of galaxies at the extreme bright end ( mag) of the UV luminosity function. Despite this exceptional result, the still large statistical uncertainties do not allow us to discriminate between a Schechter and a double-power-law form.
第一个星系的质量演化：CANDELS GOODS-South 场中 4 < z < 7 处的恒星质量函数和恒星形成率
影响因子：
4.8
作者：
Duncan K
通讯作者：
Duncan K
DOI：
10.1088/0004-637x/769/1/80
发表时间：
2013-05
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Ashby;S. Willner;G. Fazio;J.-S. Huang;R. Arendt;P. Barmby;G. Barro;E. Bell;R. Bouwens
通讯作者：
M. Ashby;S. Willner;G. Fazio;J.-S. Huang;R. Arendt;P. Barmby;G. Barro;E. Bell;R. Bouwens
影响因子：
6.5
作者：
McCracken, H. J.;Milvang-Jensen, B.;Zabl, J.
通讯作者：
Zabl, J.