Wold Isak G B, Barger Amy J, Cowie Lennox L
Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706, USA.
Department of Physics and Astronomy, University of Hawaii, 2505 Correa Road, Honolulu, HI 96822, USA.
Astrophys J. 2014 Mar 10;783(2). doi: 10.1088/0004-637x/783/2/119. Epub 2014 Feb 21.
We construct a flux-limited sample of 135 candidate ~ 1 Ly emitters (LAEs) from () grism data using a new data cube search method. These LAEs have luminosities comparable to those at high redshifts and lie within a 7 Gyr gap present in existing LAE samples. We use archival and newly obtained optical spectra to verify the UV redshifts of these LAEs. We use the combination of the UV spectra, optical spectra, and X-ray imaging data to estimate the active galactic nucleus (AGN) fraction and its dependence on Ly luminosity. We remove the AGNs and compute the luminosity function (LF) from 60 ~ 1 LAE galaxies. We find that the best-fit LF implies a luminosity density increase by a factor of ~1.5 from ~ 0.3 to ~ 1 and ~20 from ~ 1 to ~ 2. We find a ~ 1 volumetric Ly escape fraction of 0.7% ± 0.4%.
我们使用一种新的数据立方体搜索方法，从（）棱镜数据中构建了一个包含135个候选1 Ly发射体（LAEs）的流量限制样本。这些LAEs的光度与高红移时的相当，且位于现有LAE样本中存在的7 Gyr间隔内。我们使用存档的和新获得的光学光谱来验证这些LAEs的紫外红移。我们结合紫外光谱、光学光谱和X射线成像数据来估计活动星系核（AGN）的比例及其对Ly光度的依赖性。我们去除AGN，并从60个1 LAE星系计算光度函数（LF）。我们发现，最佳拟合的LF意味着光度密度从0.3到1增加了约1.5倍，从1到2增加了约20倍。我们发现~1体积的Ly逃逸率为0.7%±0.4%。
