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arXiv 2012.08566astro-ph.CO
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暗能量巡天第三年结果:弱透镜源星系的红移定标

Dark Energy Survey Year 3 Results: Redshift Calibration of the Weak Lensing Source Galaxies

J. Myles, A. Alarcon, A. Amon, C. Sánchez, S. Everett, J. DeRose, J. McCullough, D. Gruen, G. M. Bernstein, M. A. Troxel, S. Dodelson, A. Campos, N. MacCrann, B… 展开作者

J. Myles, A. Alarcon, A. Amon, C. Sánchez, S. Everett, J. DeRose, J. McCullough, D. Gruen, G. M. Bernstein, M. A. Troxel, S. Dodelson, A. Campos, N. MacCrann, B. Yin, M. Raveri, A. Amara, M. R. Becker, A. Choi, J. Cordero, K. Eckert, M. Gatti, G. Giannini, J. Gschwend, R. A. Gruendl, I. Harrison, W. G. Hartley, E. M. Huff, N. Kuropatkin, H. Lin, D. Masters, R. Miquel, J. Prat, A. Roodman, E. S. Rykoff, I. Sevilla-Noarbe, E. Sheldon, R. H. Wechsler, B. Yanny, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, D. Bacon, E. Bertin, S. Bhargava, S. L. Bridle, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, C. Conselice, M. Costanzi, M. Crocce, L. N. da Costa, M. E. S. Pereira, S. Desai, H. T. Diehl, T. F. Eifler, J. Elvin-Poole, A. E. Evrard, I. Ferrero, A. Ferté, B. Flaugher, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztanaga, T. Giannantonio, S. R. Hinton, D. L. Hollowood, K. Honscheid, B. Hoyle, D. Huterer, D. J. James, E. Krause, K. Kuehn, O. Lahav, M. Lima, M. A. G. Maia, J. L. Marshall, P. Martini, P. Melchior, F. Menanteau, J. J. Mohr, R. Morgan, J. Muir, R. L. C. Ogando, A. Palmese, F. Paz-Chinchón, A. A. Plazas, M. Rodriguez-Monroy, S. Samuroff, E. Sanchez, V. Scarpine, L. F. Secco, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, T. N. Varga, J. Weller, W. Wester

摘要:

确定星系红移的分布,通过宽视场测光实验,如暗能量调查,是一个必不可少的组成部分映射的物质密度场与引力透镜。在这项工作中,我们描述的方法来分配个人弱透镜源星系从暗能量调查3年弱透镜源目录到四个层析箱,并估计在这些箱的红移分布。作为第一次应用这些方法的数据,我们验证了假设适用于DES Y3弱透镜源星系,并制定了全面的治疗系统的不确定性。我们的方法包括从三个独立的似然函数相结合的信息:自组织映射$p(z)$(SOMPZ),一种方法,用于约束红移星系测光;集群红移(WZ),约束红移星系密度函数的互相关;和剪切比(SR),它提供约束红移的星系剪切关联函数的比例在小尺度。最后,我们描述了如何将这些独立的探测器相结合,以产生一个合奏的红移分布封装我们的全部不确定性。我们校准红移结合有效的不确定性$σ_{\langle z \rangle}\sim 0.01$的平均红移在每个层析箱。

英文摘要:

Determining the distribution of redshifts of galaxies observed by wide-field photometric experiments like the Dark Energy Survey is an essential component to mapping the matter density field with gravitational lensing. In this work we describe the methods used to assign individual weak lensing source galaxies from the Dark Energy Survey Year 3 Weak Lensing Source Catalogue to four tomographic bins and to estimate the redshift distributions in these bins. As the first application of these methods to data, we validate that the assumptions made apply to the DES Y3 weak lensing source galaxies and develop a full treatment of systematic uncertainties. Our method consists of combining information from three independent likelihood functions: Self-Organizing Map $p(z)$ (SOMPZ), a method for constraining redshifts from galaxy photometry; clustering redshifts (WZ), constraints on redshifts from cross-correlations of galaxy density functions; and shear ratios (SR), which provide constraints on redshifts from the ratios of the galaxy-shear correlation functions at small scales. Finally, we describe how these independent probes are combined to yield an ensemble of redshift distributions encapsulating our full uncertainty. We calibrate redshifts with combined effective uncertainties of $σ_{\langle z \rangle}\sim 0.01$ on the mean redshift in each tomographic bin.

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