Theoretical uncertainties due to AGN subgrid models in predictions of galaxy cluster observable properties-猫眼课题宝

星系团可观测特性预测中 AGN 子网格模型造成的理论不确定性

DOI：

10.1111/j.1365-2966.2012.22069.x

发表时间：

2012

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：

H. Yang;P. Sutter;P. Ricker;P. Ricker

来自星系团的宇宙学约束依赖于对星系团可观测性质的准确预测，其中来自活动星系核(AGN)的反馈是一个关键组成部分。为了在宇宙尺度上模拟超大质量黑洞(SMBH)的物理效应，需要亚格子模拟，文献中已经发展了各种实现方法。然而，由于模型和参数变化导致的理论不确定性尚未得到很好的理解，这限制了包括AGN反馈在内的模拟的预测能力。通过使用几种常用的AGN吸积和反馈模型对单个星系团进行详细的参数敏感性研究，我们量化了模型在预测星系团综合性质时的不确定性。我们发现，对气体密度越敏感的量具有更大的不确定度(在R500处，MGA的∼为20%，LX的∼因子为2)，而TX、YSZ和YX更稳健(在R500处的∼为10%-20%)。要做出超出这一精度水平的预测，需要对最相关的参数有更多的限制：吸积模型、机械加热效率和反馈区域的大小。通过研究AGN反馈对标度关系的影响，我们发现MGA和TX之间存在反关联，这也是YSZ和YX成为优秀质量替代物的另一个原因。这种反相关性也意味着活动星系核反馈可能是MGA-TX和LX-TX关系中本征散射的一个重要来源。

Cosmological constraints derived from galaxy clusters rely on accurate predictions of cluster observable properties, in which feedback from active galactic nuclei (AGN) is a critical component. In order to model the physical effects due to supermassive black holes (SMBH) on cosmological scales, subgrid modelling is required, and a variety of implementations have been developed in the literature. However, theoretical uncertainties due to model and parameter variations are not yet well understood, limiting the predictive power of simulations including AGN feedback. By performing a detailed parameter-sensitivity study in a single cluster using several commonly adopted AGN accretion and feedback models with flash, we quantify the model uncertainties in predictions of cluster integrated properties. We find that quantities that are more sensitive to gas density have larger uncertainties (∼20 per cent for Mgas and a factor of ∼2 for LX at R500), whereas TX, YSZ and YX are more robust (∼10–20 per cent at R500). To make predictions beyond this level of accuracy would require more constraints on the most relevant parameters: the accretion model, mechanical heating efficiency and size of feedback region. By studying the impact of AGN feedback on the scaling relations, we find that an anti-correlation exists between Mgas and TX, which is another reason why YSZ and YX are excellent mass proxies. This anti-correlation also implies that AGN feedback is likely to be an important source of intrinsic scatter in the Mgas–TX and LX–TX relations.

GALAXY CLUSTERS SELECTED WITH THE SUNYAEV–ZEL'DOVICH EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS

DOI： 10.1088/0004-637x/722/2/1180

发表时间： 2010-03

期刊：

The Astrophysical Journal

影响因子： --

作者：

F. W. High;B. Stalder;J. Song;P. Ade;K. Aird;S. Allam;R. Armstrong;W. Barkhouse;B. Benson;B. Benson;E. Bertin;Suman Bhattacharya;L. Bleem;M. Brodwin;E. Buckley-Geer;J. Carlstrom;P. Challis;C. Chang;T. Crawford;A. Crites;T. Haan;S. Desai;M. Dobbs;J. Dudley;R. Foley;E. George;M. Gladders;N. Halverson;M. Hamuy;S. Hansen;G. Holder;W. Holzapfel;J. Hrubeš;M. Joy;R. Keisler;Adrian T. Lee;Adrian T. Lee;E. Leitch;Huan Lin;Yen-Ting Lin;A. Loehr;M. Lueker;D. Marrone;J. McMahon;J. McMahon;J. Mehl;S. Meyer;J. J. Mohr-J.;T. Montroy;N. Morell;C. Ngeow;S. Padin;T. Plagge;T. Plagge;C. Pryke;C. Reichardt;A. Rest;J. Ruel;J. Ruhl;K. Schaffer;L. Shaw;L. Shaw;E. Shirokoff;R. C. Smith;H. Spieler;Z. Staniszewski;A. Stark;C. Stubbs;D. Tucker;K. Vanderlinde;J. Vieira;R. Williamson;W. M. Wood-Vasey;Y. Yang;O. Zahn;A. Zenteno

通讯作者：

Theoretical uncertainties due to AGN subgrid models in predictions of galaxy cluster observable properties

星系团可观测特性预测中 AGN 子网格模型造成的理论不确定性

文献摘要

参考文献

被引文献

相似文献