The size–luminosity relation of lensed galaxies at z ∼ 6–9 in the Hubble Frontier Fields
The size–luminosity relation of lensed galaxies at z ∼ 6–9 in the Hubble Frontier Fields
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DOI：
10.1093/mnras/stac1236
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发表时间：
2022-01
影响因子：
4.8
通讯作者：
Lilan Yang;N. Leethochawalit;T. Treu;G. Roberts-Borsani;M. Bradač;S. Birrer;M. Castellano;E. Merlin
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文献类型：
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作者：
Lilan Yang;N. Leethochawalit;T. Treu;G. Roberts-Borsani;M. Bradač;S. Birrer;M. Castellano;E. Merlin
我们测量的大小-光度关系的光度选择的星系的红移范围内z 106 -9，使用六个前景哈勃前沿场（HFF）星系团透镜的星系。强大的引力透镜所提供的力量使我们能够观察到比空白区域更暗更小的星系。我们选择我们的样本星系，并获得其属性，例如红移，星等，从光度推导ASTRODEEP目录。用Lenstruction软件测量固有尺寸，并通过GLACiAR 2软件创建完整性图作为尺寸和光度的函数。我们执行贝叶斯分析来估计固有的和不完全校正的尺寸-光度分布，参数化re β。采用Bradac透镜模型，我们发现在z = 6 − 7时斜率为$\beta =0.50^{+0.07}_{-0.07}$，在z = 8.5时斜率为$\beta =0.67^{+0.14}_{-0.15}$。我们推断的斜率是一致的，从HFF数据集的大小-光度关系的其他独立的测定和陡峭的比从明亮的星系在空白领域。我们还调查了系统的不确定性与透镜模型的选择，发现来自不同的模型的大小-光度关系的斜率是相互一致的，即建模误差是不是一个显着的空白和透镜领域的大小-光度关系之间的差异的来源。
We measure the size–luminosity relation of photometrically selected galaxies within the redshift range z ∼ 6–9, using galaxies lensed by six foreground Hubble Frontier Fields (HFF) clusters. The power afforded by strong gravitational lensing allows us to observe fainter and smaller galaxies than in blank fields. We select our sample of galaxies and obtain their properties, e.g. redshift, magnitude, from the photometrically derived ASTRODEEP catalogues. The intrinsic size is measured with the Lenstruction software, and completeness maps are created as a function of size and luminosity via the GLACiAR2 software. We perform a Bayesian analysis to estimate the intrinsic and incompleteness-corrected size–luminosity distribution, with parametrization re ∝ Lβ. We find slopes of $\beta =0.50^{+0.07}_{-0.07}$ at z ∼ 6 − 7 and $\beta =0.67^{+0.14}_{-0.15}$ at z ∼ 8.5, adopting the Bradac lens model. Our inferred slopes are consistent with other independent determinations of the size–luminosity relation from the HFF data set and steeper than that obtained from the bright galaxies in blank fields. We also investigate the systematic uncertainties associated with the choice of lens models, finding that the slopes of size–luminosity relations derived from different models are mutually consistent, i.e. modelling errors are not a significant source of discrepancy between the size–luminosity relation of blank and lensed fields.