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arXiv 2104.05698astro-ph.CO
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欧几里得制剂:XII。为星系成团和星系-星系透镜分析优化欧几里德巡天光度计样本

Euclid preparation: XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses

Euclid Collaboration, A. Pocino, I. Tutusaus, F. J. Castander, P. Fosalba, M. Crocce, A. Porredon, S. Camera, V. Cardone, S. Casas, T. Kitching, F. Lacasa, M. M… 展开作者

Euclid Collaboration, A. Pocino, I. Tutusaus, F. J. Castander, P. Fosalba, M. Crocce, A. Porredon, S. Camera, V. Cardone, S. Casas, T. Kitching, F. Lacasa, M. Martinelli, A. Pourtsidou, Z. Sakr, S. Andreon, N. Auricchio, C. Baccigalupi, A. Balaguera-Antolínez, M. Baldi, A. Balestra, S. Bardelli, R. Bender, A. Biviano, C. Bodendorf, D. Bonino, A. Boucaud, E. Bozzo, E. Branchini, M. Brescia, J. Brinchmann, C. Burigana, R. Cabanac, V. Capobianco, A. Cappi, C. S. Carvalho, M. Castellano, G. Castignani, S. Cavuoti, A. Cimatti, R. Cledassou, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, A. Costille, J. Coupon, H. M. Courtois, M. Cropper, J. -G. Cuby, A. Da Silva, S. de la Torre, D. Di Ferdinando, F. Dubath, C. Duncan, X. Dupac, S. Dusini, S. Farrens, P. G. Ferreira, I. Ferrero, F. Finelli, S. Fotopoulou, M. Frailis, E. Franceschi, S. Galeotta, B. Garilli, W. Gillard, B. Gillis, C. Giocoli, G. Gozaliasl, J. Graciá-Carpio, F. Grupp, L. Guzzo, W. Holmes, F. Hormuth, K. Jahnke, E. Keihanen, S. Kermiche, A. Kiessling, C. C. Kirkpatrick, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, N. Martinet, F. Marulli, R. Massey, S. Maurogordato, E. Medinaceli, S. Mei, M. Meneghetti, R. Benton Metcalf, G. Meylan, M. Moresco, B. Morin, L. Moscardini, E. Munari, R. Nakajima, C. Neissner, R. C. Nichol, S. Niemi, J. Nightingale, C. Padilla, S. Paltani, F. Pasian, L. Patrizii, K. Pedersen, W. J. Percival, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. Popa, D. Potter, L. Pozzetti, F. Raison, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, E. Rossetti, R. Saglia, A. G. Sánchez, D. Sapone, R. Scaramella, P. Schneider, V. Scottez, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, F. Sureau, A. N. Taylor, M. Tenti, I. Tereno, R. Teyssier, R. Toledo-Moreo, A. Tramacere, E. A. Valentijn, L. Valenziano, J. Valiviita, T. Vassallo, M. Viel, Y. Wang, N. Welikala, L. Whittaker, A. Zacchei, G. Zamorani, J. Zoubian, E. Zucca

摘要:

光度红移(photo-zs)的准确性,特别是影响分析的结果与光度选择星系(GCph)和弱透镜的星系团。在接下来的十年里,像欧几里德这样的太空任务将收集数百万个星系的光度测量数据。这些数据应该与即将进行的地面观测相补充,以获得精确和准确的照片。在本文中,我们将探讨如何层析红移面元和地面观测的深度将影响宇宙学的约束预期从欧几里得。我们专注于GCph并将研究扩展到包括星系-星系透镜(GGL)。我们增加了一层复杂性的分析,模拟几个现实的photo-z分布的基础上,欧几里德联盟旗舰模拟和使用机器学习photo-z算法。我们使用Fisher矩阵形式主义和这些星系样本来研究宇宙学约束力作为红移分仓,调查深度和photo-z精度的函数。我们发现,在红移中具有相等宽度的箱提供了更高的品质因数(FoM)比等人口的箱,并且将红移箱的数量从10个增加到13个,GCph及其与GGL的组合分别提高了35%和15%的FoM。对于GCph,调查深度的增加提供了更高的FoM。但是,在光谱训练数据的限制之外添加暗淡星系会降低FoM,这是由于虚假的photo-z。当结合两种探头时,由勘测深度设定的样品的数量密度是驱动FoM变化的主要因素。我们的结论是,有更多的信息,可以提取超出名义上的10个层析红移箱的欧几里得,我们应该谨慎时,我们的样本中添加微弱的星系,因为它们可以降低宇宙学的约束。

英文摘要:

The accuracy of photometric redshifts (photo-zs) particularly affects the results of the analyses of galaxy clustering with photometrically-selected galaxies (GCph) and weak lensing. In the next decade, space missions like Euclid will collect photometric measurements for millions of galaxies. These data should be complemented with upcoming ground-based observations to derive precise and accurate photo-zs. In this paper, we explore how the tomographic redshift binning and depth of ground-based observations will affect the cosmological constraints expected from Euclid. We focus on GCph and extend the study to include galaxy-galaxy lensing (GGL). We add a layer of complexity to the analysis by simulating several realistic photo-z distributions based on the Euclid Consortium Flagship simulation and using a machine learning photo-z algorithm. We use the Fisher matrix formalism and these galaxy samples to study the cosmological constraining power as a function of redshift binning, survey depth, and photo-z accuracy. We find that bins with equal width in redshift provide a higher Figure of Merit (FoM) than equipopulated bins and that increasing the number of redshift bins from 10 to 13 improves the FoM by 35% and 15% for GCph and its combination with GGL, respectively. For GCph, an increase of the survey depth provides a higher FoM. But the addition of faint galaxies beyond the limit of the spectroscopic training data decreases the FoM due to the spurious photo-zs. When combining both probes, the number density of the sample, which is set by the survey depth, is the main factor driving the variations in the FoM. We conclude that there is more information that can be extracted beyond the nominal 10 tomographic redshift bins of Euclid and that we should be cautious when adding faint galaxies into our sample, since they can degrade the cosmological constraints.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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