Modelling projection effects in optically selected cluster catalogues-猫眼课题宝

对光学选择的簇目录中的投影效果进行建模

DOI：

10.1093/mnras/sty2665

发表时间：

2018

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

M. Costanzi;E. Rozo;E. Rykoff;E. Rykoff;A. Farahi;T. Jeltema;A. Evrard;A. Mantz;D. Gruen;D. Gruen;R. Mandelbaum;J. DeRose;T. McClintock;T. Varga;T. Varga;Yuanyuan Zhang;Yuanyuan Zhang;J. Weller;J. Weller;Risa Wechsler;Risa Wechsler;M. Aguena

星系团星表的宇宙学效用主要受限于我们校准晕质量和可观测质量代理（如星系团丰富度、X射线光度或Sunyaev-Zeldovich信号）之间关系的能力。投影效应是一种特别有害的系统效应，它会影响可观测的质量代理;沿视线沿着的结构既会使星团丰度研究中使用的可观测质量代理产生偏差，也会增加其分散性。在这项工作中，我们开发了一种经验方法来表征投影效应对redMapPer集群目录的影响。我们使用数值模拟来验证我们的方法，并说明其鲁棒性。我们表明，投影效应的建模是一个必要的组成部分，集群丰度研究能够达到$\约5\%$质量校准的不确定性（例如，暗能量调查1年的样本）。具体来说，忽略可观测质量关系中投影效应的影响--即仅在对数正态模型上边缘化--使聚类标准化条件的后验偏差为$\Delta S_8 =0.05$，是此类分析后验不确定性的两倍多。

The cosmological utility of galaxy cluster catalogues is primarily limited by our ability to calibrate the relation between halo mass and observable mass proxies such as cluster richness, X-ray luminosity or the Sunyaev-Zeldovich signal. Projection effects are a particularly pernicious systematic effect that can impact observable mass proxies; structure along the line of sight can both bias and increase the scatter of the observable mass proxies used in cluster abundance studies. In this work, we develop an empirical method to characterize the impact of projection effects on redMaPPer cluster catalogues. We use numerical simulations to validate our method and illustrate its robustness. We demonstrate that modeling of projection effects is a necessary component for cluster abundance studies capable of reaching $\approx 5\%$ mass calibration uncertainties (e.g. the Dark Energy Survey Year 1 sample). Specifically, ignoring the impact of projection effects in the observable--mass relation --- i.e. marginalizing over a log-normal model only --- biases the posterior of the cluster normalization condition $S_8 \equiv \sigma_8 (\Omega_{\rm m}/0.3)^{1/2}$ by $\Delta S_8 =0.05$, more than twice the uncertainty in the posterior for such an analysis.

Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters

DOI： 10.1093/mnras/sty2711

发表时间： 2018-04

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子： 4.8

作者：

T. McClintock;T. Varga;D. Gruen;E. Rozo;E. Rykoff;T. Shin;Peter Melchior;J. DeRose;S. Seitz;J. Dietrich;E. Sheldon;Y. Zhang;A. V. D. Linden;T. Jeltema;A. Mantz;A. Romer;S. Allen;M. Becker;A. Bermeo;S. Bhargava;M. Costanzi;S. Everett;A. Farahi;N. Hamaus;W. Hartley;D. Hollowood;B. Hoyle;H. Israel;P. Li;N. MacCrann;G. Morris;A. Palmese;A. Plazas;G. Pollina;M. Rau;M. Simet;M. Soares-Santos;M. Troxel;C. Cervantes;Risa Wechsler;J. Zuntz;T. Abbott;F. Abdalla;S. Allam;J. Annis;S. Ávila;S. Bridle;D. Brooks;D. Burke;A. Rosell;M. Kind;J. Carretero;F. Castander;M. Crocce;C. Cunha;C. D'Andrea;L. Costa;C. Davis;J. Vicente;H. Diehl;P. Doel;A. Drlica-Wagner;A. Evrard;B. Flaugher;P. Fosalba;J. Frieman;J. Garc'ia-Bellido;E. Gaztañaga;D. Gerdes;T. Giannantonio;R. Gruendl;G. Gutiérrez;K. Honscheid;D. James;D. Kirk;E. Krause;K. Kuehn;O. Lahav;T. Li;M. Lima;M. March;J. Marshall;F. Menanteau;R. Miquel;J. Mohr;B. Nord;R. Ogando;A. Roodman;E. Sánchez;V. Scarpine;R. Schindler;I. Sevilla-Noarbe;M. Smith;R. C. Smith;F. Sobreira;E. Suchyta;M. Swanson;G. Tarlé;D. Tucker;V. Vikram;A. Walker;J. Weller

通讯作者：

Modelling projection effects in optically selected cluster catalogues

对光学选择的簇目录中的投影效果进行建模

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