SuperCLASS – II. Photometric redshifts and characteristics of spatially resolved μJy radio sources

SuperCLASS – II. Photometric redshifts and characteristics of spatially resolved μJy radio sources
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SuperCLASS – II。

DOI:
10.1093/mnras/staa657
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发表时间:
2020
影响因子:
4.8
通讯作者:
Drew, Patrick
Drew, Patrick
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Manning, Sinclaire M;Casey, Caitlin M;Hung, Chao-Ling;Battye, Richard;Brown, Michael L;Jackson, Neal;Abdalla, Filipe;Chapman, Scott;Demetroullas, Constantinos;Drew, Patrick

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我们在超星团辅助剪切巡天(SuperCLASS)领域展示了覆盖约 1.53°deg2 区域的光学和近红外成像,旨在首次在无线电波长下进行鲁棒的弱透镜测量。我们导出了约 176 000 个源的光度红移,并呈现了 1.4GHz 扩展多元件无线电链接干涉仪网络 (e-MERLIN) 和 Karl G. Jansky 甚大阵列 (VLA) 检测到的在中心 0.26 deg2 中发现的射电源的光度红移。我们编制了 149 个亮度高于 S1.4> 75μJy 的射电源的初始目录,发现它们的光度红移跨度为 0 <zphot< 4,射电光度在 1021 和 1025W Hz−1 之间,中位数分别为 和 W Hz−1。我们发现 95% 的 μJy 射电源样本 (141/149) 具有最适合恒星形成模板的光谱能量分布 (SED),而 5% (8/149) 则更适合活动星系核 (AGN)。频谱指数是根据 VLA 和巨型米波射电望远镜 (GMRT) 在 325MHz 的射电观测值计算的,平均频谱斜率为 α = 0.59 ± 0.04。使用完整的光度红移目录,我们构建了已知星系团红移处的密度图,z= 0.20 ± 0.08。五个星团中的四个在密度图中被显着检测到,我们确认光度红移与之前测量的星团中心几个星系的光谱一致。
We present optical and near-infrared imaging covering a ∼1.53 deg2region in the Super-Cluster Assisted Shear Survey (SuperCLASS) field, which aims to make the first robust weak lensing measurement at radio wavelengths. We derive photometric redshifts for ≈176 000 sources down toand present photometric redshifts for 1.4 GHz expanded Multi-Element Radio Linked Interferometer Network (e-MERLIN) and Karl G. Jansky Very Large Array (VLA) detected radio sources found in the central 0.26 deg2. We compile an initial catalogue of 149 radio sources brighter than S1.4> 75μJy and find their photometric redshifts span 0 <zphot< 4 with radio luminosities between 1021and 1025W Hz−1, with medians ofandW Hz−1, respectively. We find 95 per cent of theμJy radio source sample (141/149) have spectral energy distributions (SEDs) best fit by star-forming templates while 5 per cent (8/149) are better fit by active galactic nuclei (AGN). Spectral indices are calculated for sources with radio observations from the VLA and Giant Metrewave Radio Telescope (GMRT) at 325 MHz, with an average spectral slope of α = 0.59 ± 0.04. Using the full photometric redshift catalogue, we construct a density map at the redshift of the known galaxy clusters,z= 0.20 ± 0.08. Four of the five clusters are prominently detected atin the density map and we confirm the photometric redshifts are consistent with previously measured spectra from a few galaxies at the cluster centres.
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