SuperCLASS – III. Weak lensing from radio and optical observations in Data Release 1
SuperCLASS – III. Weak lensing from radio and optical observations in Data Release 1
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DOI：
10.1093/mnras/staa696
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发表时间：
2020-03
影响因子：
4.8
通讯作者：
I. Harrison;I. Harrison;Michael L. Brown;B. Tunbridge;Daniel B. Thomas;T. Hillier;Alasdair Thomson;L. Whittaker;L. Whittaker;F. Abdalla;R. Battye;A. Bonaldi;S. Camera;S. Camera;C. Casey;C. Demetroullas;C. Demetroullas;Christopher A. Hales;Christopher A. Hales;N. Jackson;S. Kay;S. Manning;A. Peters;C. Riseley;C. Riseley;R. Watson
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文献类型：
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作者：
I. Harrison;I. Harrison;Michael L. Brown;B. Tunbridge;Daniel B. Thomas;T. Hillier;Alasdair Thomson;L. Whittaker;L. Whittaker;F. Abdalla;R. Battye;A. Bonaldi;S. Camera;S. Camera;C. Casey;C. Demetroullas;C. Demetroullas;Christopher A. Hales;Christopher A. Hales;N. Jackson;S. Kay;S. Manning;A. Peters;C. Riseley;C. Riseley;R. Watson
我们描述了SuperCLASS巡天中关于弱引力透镜效应的第一个结果：这是第一个专门用于测量无线电波长数据中的弱透镜效应的巡天，无论是单独的还是与光学数据相互关联的。我们分析了来自斯巴鲁望远镜的1.53美元光学数据和来自e-MERLIN和VLA望远镜（DR1数据集）的0.26美元无线电数据。我们使用标准的方法仅对光学数据进行了显著（10σ）的弱透镜信号（剪切功率谱）检测，这是由于目标区域的巨大星系超星系团造成的。对于射电数据，我们提出了一种从干涉数据测量星系形状的新方法，并构建了一个模拟管道来验证该方法。然后，我们将此分析应用于我们的无线电观测，独立处理e-MERLIN和VLA数据。我们在VLA数据中实现了0.5 \,$ arcmin−2的源密度，在e-MERLIN数据中实现了0.06 \,$ arcmin−2的源密度，这个数字太小，无法在单独的无线电数据或与光学数据相互关联的情况下检测到弱透镜信号。最后，我们展示了来自e-MERLIN和VLA的数据的可见平面组合的初步结果，这些数据将用于即将发布的完整SuperCLASS数据发布。这种数据组合方法有望提高可用弱透镜源的数量密度，以及测量其形状的保真度。
We describe the first results on weak gravitational lensing from the SuperCLASS survey: the first survey specifically designed to measure the weak lensing effect in radio-wavelength data, both alone and in cross-correlation with optical data. We analyse $1.53 \, \mathrm{deg}^2$ of optical data from the Subaru telescope and $0.26 \, \mathrm{deg}^2$ of radio data from the e-MERLIN and VLA telescopes (the DR1 data set). Using standard methodologies on the optical data only we make a significant (10σ) detection of the weak lensing signal (a shear power spectrum) due to the massive supercluster of galaxies in the targeted region. For the radio data we develop a new method to measure the shapes of galaxies from the interferometric data, and we construct a simulation pipeline to validate this method. We then apply this analysis to our radio observations, treating the e-MERLIN and VLA data independently. We achieve source densities of $0.5 \,$ arcmin−2 in the VLA data and $0.06 \,$ arcmin−2 in the e-MERLIN data, numbers which prove too small to allow a detection of a weak lensing signal in either the radio data alone or in cross-correlation with the optical data. Finally, we show preliminary results from a visibility-plane combination of the data from e-MERLIN and VLA which will be used for the forthcoming full SuperCLASS data release. This approach to data combination is expected to enhance both the number density of weak lensing sources available, and the fidelity with which their shapes can be measured.