MACS J0416.1–2403: Impact of line-of-sight structures on strong gravitational lensing modelling of galaxy clusters
MACS J0416.1–2403: Impact of line-of-sight structures on strong gravitational lensing modelling of galaxy clusters
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MACS J0416.1–2403：视线结构对星系团强引力透镜模型的影响
DOI：
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发表时间：
2017
影响因子：
6.5
通讯作者：
P. Rosati
中科院分区：
文献类型：
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作者：
G. Chirivì;S. Suyu;C. Grillo;A. Halkola;I. Balestra;G. Caminha;A. Mercurio;P. Rosati
利用星系团强引力透镜这一强大工具来研究最高红移宇宙和星系团质量分布依赖于精确的透镜质量建模。在这项工作中，我们的目标是首次尝试对星团之外的视线 (LOS) 质量分布进行建模，扩展先前假设质量分布位于单个透镜平面上的建模技术。我们重点关注哈勃前沿场星团 MACS J0416.1–2403，我们的多平面模型以 ~0.′′53 的均方根偏移再现了观测到的图像位置。从这个最佳拟合模型开始，我们模拟了一个类似于 MACS J0416.1-2403 的模拟星团，以探索 LOS 结构对星团质量建模的影响。通过系统分析不同模型假设下的模拟簇，我们发现忽略透镜环境对图像位置的重建有显着影响（rms ~0.′′3）；将视距星系视为位于星团红移处可以部分减少这种偏移。此外，将前景星系纳入模型比背景星系更重要。虽然约 95% 的透镜多重图像的放大系数恢复在约 10% 以内，但位于临界曲线附近的约 5% 的图像可能会受到模型中透镜环境排除的显着影响。此外，LOS星系无法解释MACS J0416.1-2403和N体模拟星团之间大质量子晕特性的明显差异。由于我们的具有 LOS 星系的 MACS J0416.1–2403 模型仅适度减少了图像位置的均方根偏移，因此我们得出结论，未来的 MACS J0416.1–2403 模型将需要额外的复杂性。
Exploiting the powerful tool of strong gravitational lensing by galaxy clusters to study the highest-redshift Universe and cluster mass distributions relies on precise lens mass modelling. In this work, we aim to present the first attempt at modelling line-of-sight (LOS) mass distribution in addition to that of the cluster, extending previous modelling techniques that assume mass distributions to be on a single lens plane. We have focussed on the Hubble Frontier Field cluster MACS J0416.1–2403, and our multi-plane model reproduces the observed image positions with a rms offset of ~0.′′53. Starting from this best-fitting model, we simulated a mock cluster that resembles MACS J0416.1–2403 in order to explore the effects of LOS structures on cluster mass modelling. By systematically analysing the mock cluster under different model assumptions, we find that neglecting the lensing environment has a significant impact on the reconstruction of image positions (rms ~0.′′3); accounting for LOS galaxies as if they were at the cluster redshift can partially reduce this offset. Moreover, foreground galaxies are more important to include into the model than the background ones. While the magnification factor of the lensed multiple images are recovered within ~10% for ~95% of them, those ~5% that lie near critical curves can be significantly affected by the exclusion of the lensing environment in the models. In addition, LOS galaxies cannot explain the apparent discrepancy in the properties of massive sub-halos between MACS J0416.1–2403 and N-body simulated clusters. Since our model of MACS J0416.1–2403 with LOS galaxies only reduced modestly the rms offset in the image positions, we conclude that additional complexities would be needed in future models of MACS J0416.1–2403.
DOI：
10.3847/0067-0049/224/2/33
发表时间：
2015-11
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
I. Balestra;A. Mercurio;B. Sartoris;M. Girardi;C. Grillo;M. Nonino;P. Rosati;A. Biviano;S. Ettori;W. Forman;C. Jones;A. Koekemoer;E. Medezinski;J. Merten;G. Ogrean;P. Tozzi;K. Umetsu;E. Vanzella;R. V. Weeren;A. Zitrin;M. Annunziatella;G. Caminha;T. Broadhurst;D. Coe;M. Donahue;A. Fritz;B. Frye;D. Kelson;M. Lombardi;C. Maier;M. Meneghetti;A. Monna;M. Postman;M. Scodeggio;S. Seitz;B. Ziegler
通讯作者：
I. Balestra;A. Mercurio;B. Sartoris;M. Girardi;C. Grillo;M. Nonino;P. Rosati;A. Biviano;S. Ettori;W. Forman;C. Jones;A. Koekemoer;E. Medezinski;J. Merten;G. Ogrean;P. Tozzi;K. Umetsu;E. Vanzella;R. V. Weeren;A. Zitrin;M. Annunziatella;G. Caminha;T. Broadhurst;D. Coe;M. Donahue;A. Fritz;B. Frye;D. Kelson;M. Lombardi;C. Maier;M. Meneghetti;A. Monna;M. Postman;M. Scodeggio;S. Seitz;B. Ziegler
DOI：
10.1111/j.1365-2966.2011.19523.x
发表时间：
2011-07
影响因子：
4.8
作者：
A. Bonafede;K. Dolag;F. Stasyszyn;G. Murante;S. Borgani
通讯作者：
A. Bonafede;K. Dolag;F. Stasyszyn;G. Murante;S. Borgani