Accurate dark-matter halo elongation from weak-lensing stacking analysis

Author:

Gonzalez Elizabeth J12,Hoffmann Kai34,Gaztañaga Enrique35ORCID,García Lambas Diego R12,Fosalba Pablo35ORCID,Crocce Martin35ORCID,Castander Francisco J35,Makler Martín67

Affiliation:

1. Instituto de Astronomía Teórica y Experimental (IATE-CONICET) , Laprida 854, X5000BGR, Córdoba, Argentina

2. Observatorio Astronómico de Córdoba, Universidad Nacional de Córdoba , Laprida 854, X5000BGR, Córdoba, Argentina

3. Institute of Space Sciences (ICE, CSIC), Campus UAB , Carrer de Can Magrans, s/n, E-08193 Bellaterra (Barcelona), Spain

4. Institute for Computational Science, University of Zurich , Winterthurerstr. 190, CH-8057 Zürich, Switzerland

5. Institut d’Estudis Espacials de Catalunya (IEEC) , Carrer del Gran Capità, 2, E-08034 Barcelona, Spain

6. International Center for Advanced Studies & Instituto de Ciencias Físicas , ECyT-UNSAM & CONICET, 1650, San Martín, Provincia de Buenos Aires, Argentina

7. Centro Brasileiro de Pesquisas Físicas , Rua Dr. Xavier Sigaud 150, CEP 22290-180, Rio de Janeiro, RJ, Brazil

Abstract

ABSTRACT Shape estimates that quantifying the halo anisotropic mass distribution are valuable parameters that provide information on their assembly process and evolution. Measurements of the mean shape estimates for a sample of cluster-sized haloes can be used to test halo formation scenarios, as well as improving the modelling of potential biases in constraining cosmological parameters using these systems. In this work, we test the recovery of halo cluster shapes and masses applying weak-lensing stacking techniques. To this end, we use lensing shear and a new dark-matter halo catalogue, derived from the light-cone output of the cosmological simulation MICE-GC. We perform this study by combining the lensing signals obtained for several samples of haloes, selected according to their mass and redshift, taking into account the main directions of the dark-matter distributions. In the analysis, we test the impact of several potential introduced systematics, such as the adopted modelling, the contribution of the neighbouring mass distribution, miscentring, and misalignment effects. Our results show that when some considerations regarding the halo relaxation state are taken into account, the lensing semi-axial ratio estimates are in agreement within a 5 per cent with the mean shapes of the projected dark-matter particle distribution of the stacked haloes. The presented methodology provides a useful tool to derive reliable shapes of galaxy clusters and to contrast them with those expected from numerical simulations. Furthermore, our proposed modelling, that takes into account the contribution of neighbouring haloes, allows to constraint the elongation of the surrounding mass distribution.

Funder

European Union

Horizon 2020 - Research and Innovation Framework Programme

Agencia Nacional de Promoción Científica y Tecnológica

Consejo Nacional de Investigaciones Científicas y Técnicas

FAPERJ

CNPq

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3