THE LBT BOÖTES FIELD SURVEY. I. THE REST-FRAME ULTRAVIOLET AND NEAR-INFRARED LUMINOSITY FUNCTIONS AND CLUSTERING OF BRIGHT LYMAN BREAK GALAXIES AT Z ~ 3
THE LBT BOÖTES FIELD SURVEY. I. THE REST-FRAME ULTRAVIOLET AND NEAR-INFRARED LUMINOSITY FUNCTIONS AND CLUSTERING OF BRIGHT LYMAN BREAK GALAXIES AT Z ~ 3
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LBT BOÖtes 实地调查。
DOI：
10.1088/0004-637x/774/1/28
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Bian F
中科院分区：
文献类型：
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作者：
Bian F
我们提出了一个深LBT/LBC U光谱波段成像调查（9度2）覆盖NOAO牧夫座领域。选取了14，485个z = 3的莱曼破裂星系（LBG），测量了它们的静止标架紫外光度函数（LF）。与以往的研究相比，大样本量和调查区域减少了由于泊松统计和宇宙方差引起的LF不确定性。在明亮的一端，LF显示出与最佳拟合的谢克特函数相比的多余功率，这可以归因于z ≥ 3类星体的贡献。基于R波段和[4.5 μm]波段的通量关系，计算了z ≥ 3长周期星系的静止坐标系近红外LF和恒星质量函数（SMF）。我们调查的紫外LF和SMF之间的z 107和z 103，这支持了一个上升的星星形成历史的LBG的演变。我们研究了两个明亮的LBG样品的空间相关函数，并估计了它们的平均宿主晕质量。我们发现宿主晕质量与星系星星形成率（SFR）之间存在密切关系，它遵循晕上重子吸积率预测的趋势，这表明LBG中的星星形成是由宇宙网中的重子吸积推动的。通过比较SFR和总的重子吸积率，我们发现宇宙星星的形成效率约为5%-20%，并且它不随红移、晕质量和星系光度的变化而显著变化。
We present a deep LBT/LBC U spec-band imaging survey (9 deg 2) covering the NOAO Boötes field. A total of 14,485 Lyman break galaxies (LBGs) at z∼ 3 are selected, which are used to measure the rest-frame UV luminosity function (LF). The large sample size and survey area reduce the LF uncertainties due to Poisson statistics and cosmic variance by⩾ 3 compared to previous studies. At the bright end, the LF shows excess power compared to the best-fit Schechter function, which can be attributed to the contribution of z∼ 3 quasars. We compute the rest-frame near-infrared LF and stellar mass function (SMF) of z∼ 3 LBGs based on the R-band and [4.5 μm]-band flux relation. We investigate the evolution of the UV LFs and SMFs between z∼ 7 and z∼ 3, which supports a rising star formation history in the LBGs. We study the spatial correlation function of two bright LBG samples and estimate their average host halo mass. We find a tight relation between the host halo mass and the galaxy star formation rate (SFR), which follows the trend predicted by the baryonic accretion rate onto the halo, suggesting that the star formation in LBGs is fueled by baryonic accretion through the cosmic web. By comparing the SFRs with the total baryonic accretion rates, we find that cosmic star formation efficiency is about 5%–20% and it does not evolve significantly with redshift, halo mass, or galaxy luminosity.