The impact of spectroscopic incompleteness in direct calibration of redshift distributions for weak lensing surveys
W. G. Hartley, C. Chang, S. Samani, A. Carnero Rosell, T. M. Davis, B. Hoyle, D. Gruen, J. Asorey, J. Gschwend, C. Lidman, K. Kuehn, A. King, M. M. Rau, R. H. W… 展开作者
W. G. Hartley, C. Chang, S. Samani, A. Carnero Rosell, T. M. Davis, B. Hoyle, D. Gruen, J. Asorey, J. Gschwend, C. Lidman, K. Kuehn, A. King, M. M. Rau, R. H. Wechsler, J. DeRose, S. R. Hinton, L. Whiteway, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, S. Avila, G. M. Bernstein, E. Bertin, S. L. Bridle, D. Brooks, D. L. Burke, M. Carrasco Kind, J. Carretero, F. J. Castander, R. Cawthon, M. Costanzi, L. N. da Costa, S. Desai, H. T. Diehl, J. P. Dietrich, B. Flaugher, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, D. W. Gerdes, R. A. Gruendl, G. Gutierrez, D. L. Hollowood, K. Honscheid, D. J. James, S. Kent, E. Krause, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, R. L. C. Ogando, A. Palmese, F. Paz- Chinchon, A. A. Plazas, A. Roodman, E. S. Rykoff, E. Sanchez, V. Scarpine, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, G. Tarle, M. A. Troxel, D. L. Tucker, T. N. Varga, J. Weller, R. D. Wilkinson
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20 pages, 12 figures. Our main result is shown in Fig. 6. MNRAS, Volume 496, Issue 4, pp.4769-4786. Catalogue data used in this publication can be found here: http://star.ucl.ac.uk/~whartley/simspec/
Obtaining accurate distributions of galaxy redshifts is a critical aspect of weak lensing cosmology experiments. One of the methods used to estimate and validate redshift distributions is apply weights to a spectroscopic sample so that their weighted photometry distribution matches the target sample. In this work we estimate the \textit{selection bias} in redshift that is introduced in this procedure. We do so by simulating the process of assembling a spectroscopic sample (including observer-assigned confidence flags) and highlight the impacts of spectroscopic target selection and redshift failures. We use the first year (Y1) weak lensing analysis in DES as an example data set but the implications generalise to all similar weak lensing surveys. We find that using colour cuts that are not available to the weak lensing galaxies can introduce biases of $Δ~z\sim0.015$ in the weighted mean redshift of different redshift intervals. To assess the impact of incompleteness in spectroscopic samples, we select only objects with high observer-defined confidence flags and compare the weighted mean redshift with the true mean. We find that the mean redshift of the DES Y1 weak lensing sample is typically biased at the $Δ~z=0.005-0.05$ level after the weighting is applied. The bias we uncover can have either sign, depending on the samples and redshift interval considered. For the highest redshift bin, the bias is larger than the uncertainties in the other DES Y1 redshift calibration methods, justifying the decision of not using this method for the redshift estimations. We discuss several methods to mitigate this bias.
A Spectroscopic View of the JWST/GTO Strong Lensing Cluster A1489
我们讨论了一个光谱调查的强透镜集群A1489，其中包括195个集群成员的红移以及188个集群成员的中心速度色散。焦散线技术应用于红移测量给出了动力学参数$M_{200} = (1.25~\pm~0.09) \times 10^{15}~M_\odot$、$r_{200} = 1.97~\pm~{0.05}$ Mpc和$r_{200}$内的星团视线速度色散$1150~\pm~{72}~$ km $~$ s $^{-1}$。这些参数与其他具有较大爱因斯坦半径的强透镜系统的参数非常相似。我们使用光谱学和深测光证明，A1489可能是动态活动的，它的四个BCGs有显着不同的休息帧径向速度。像其他大质量强透镜星系团一样，A1489成员的速度色散函数显示出色散$\geq~250~$ km $~$ s $^{-1}$的过量。中心色散还对未来的透镜模型提供了增强的约束。
SDSS-IV MaNGA: A Catalogue of Spectroscopically Detected Strong Galaxy-Galaxy Lens Candidates
我们在光谱上探测到了8条可能的候选发射线，17条可能的候选发射线，以及69条可能的强星系-星系引力透镜候选发射线，这些候选发射线是在Apache Point Observatory（MaNGA）完成的邻近星系测绘中包含的约10，000个星系目标的光谱中发现的。这种搜索是基于透镜物体（SILO）项目的光谱识别方法，该项目扩展了BOSS发射线透镜调查（BELLS）和斯隆透镜ACS调查（SLACS）的光谱检测方法。我们扫描了我们从前景减去行堆叠光谱（RSS）的堆栈中构建的共同添加的残差，因此可以使用sigma-clipping方法来拒绝宇宙射线和其他形式的瞬变，这些瞬变仅影响组合曝光的一小部分。我们还构建了窄带图像的信噪比的共同添加的残差观察透镜源图像的迹象。我们还使用了几种方法来计算可能的强透镜制度，每个候选透镜，以确定候选背景星系可能居住在足够靠近星系中心的强透镜发生。我们提出的光谱红移的增值目录（VAC）的数据发布17（DR 17）的SDSS-IV。我们还介绍了镜头候选人，光谱数据，并在VAC的DR 17窄带图像。这些透镜候选者的高分辨率后续成像预计将产生确认的A级透镜的样本，具有足够的角尺寸，以探测来自最佳拟合透镜模型的质量与来自观测到的恒星速度的动态质量之间可能存在的差异。
The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: A Catalogue of Strong Galaxy-Galaxy Lens Candidates
我们在斯隆数字巡天（SDSS）第十六次数据发布（DR 16）的扩展重子振荡光谱巡天（eBOSS）中包含的$\approx2$百万个星系光谱中，光谱检测到838个可能的候选者，448个可能的候选者和265个可能的强透镜候选者。我们应用重子振荡光谱巡天（BOSS）发射线透镜巡天（BELLS）的光谱检测方法，并添加高斯拟合信息，分级，额外的检查观测量和额外的检查方法来改进我们的选择方法。我们在SDSS-I/II的Legacy调查和DESI Legacy调查的低分辨率图像中观察到477名候选人具有透镜证据，这比使用类似透镜证据观察到的BELLS候选人的百分比高$12\%$。我们在BOSS调查的最新和改进的缩减范围内进行的搜索，在搜索所有BOSS和eBOSS星系时，预期透镜候选者的数量增加了$20\%$。我们的候选者的目标和背景红移的分布是类似的候选者和确认的透镜内的贝尔观测。我们在SDSS DR 16的增值目录（VAC）中展示了我们的透镜物体光谱识别（SILO）候选者。在后续的高分辨率成像中对这些透镜候选者的检查可能会产生比SDSS中以前的光谱检测调查中发现的透镜多两倍的透镜，这将把SDSS中以前的透镜调查结果扩展到更高的红移，限制螺旋星系中质量结构的模型，并测试在低分辨率图像中包括可能的透镜特征的识别是否对光谱检测程序有价值。
The merger history of the complex cluster Abell 1758: a combined weak lensing and spectroscopic view
We present a weak-lensing and dynamical study of the complex cluster Abell 1758 (A1758, z = 0.278) supported by hydrodynamical simulations. This cluster is composed of two main structures, called A1758N and A1758S. The Northern structure is composed of A1758NW & A1758NE, with lensing determined masses of 7.90_{-1.55}^{+1.89} X 10^{14} M_ \odot and 5.49_{-1.33}^{+1.67} X 10^{14} M_ \odot , respectively. They show a remarkable feature: while in A1758NW there is a spatial agreement among weak lensing mass distribution, intracluster medium and its brightest cluster galaxy (BCG) in A1758NE the X-ra…
Weak lensing and spectroscopic analysis of the nearby dissociative merging galaxy cluster Abell 3376
The galaxy cluster Abell~3376 is a nearby (z=0.046) dissociative merging cluster surrounded by two prominent radio relics and showing an X-ray comet-like morphology. The merger system is comprised of the subclusters A3376W & A3376E. Based on new deep multi-wavelength large-field images and published redshifts, we bring new insights about the history of this merger. Despite the difficulty of applying the weak lensing technique at such low redshift, we successfully recovered the mass distribution in the cluster field. Moreover, with the application of a two-body model, we have addressed the dyna…
The Grism Lens-Amplified Survey from Space (GLASS). IV. Mass reconstruction of the lensing cluster Abell 2744 from frontier field imaging and GLASS spectroscopy
Probing Saraswati's heart: evaluating the dynamical state of the massive galaxy cluster A2631 through a comprehensive weak-lensing and dynamical analysis
在这项工作中，我们调查的星系团阿贝尔2631，一个大规模的结构，位于核心的Saraswati超星系团的动力学状态。要做到这一点，我们首先解决文献中发现的关于星系团弱透镜质量确定的矛盾。我们通过全面的弱透镜分析来做到这一点，探索剪切和放大数据集相结合的力量。我们发现$M_{200}^{\rm wl} = 8.7_{-2.9}^{+2.5} \times 10^{14}$ M $_\odot$。我们还根据光谱成员的动力学确定了质量，对应于$M_{200}^{\rm dy} = 12.2\pm3.0 \times 10^{14}$ M $_\odot$，在68%的CL内与弱透镜估计一致。由星系的质量分布和动力学提供的方案与由X射线观测提供的方案相一致，其中A2631是在合并的后期观察到的。
