Rescuing the intracluster medium of NGC 5813

被引：0

作者：

Noam Soker ^{[1
]}

Shlomi Hillel ^{[1
]}

Assaf Sternberg ^{[2
]}

机构：

[1] Department of Physics,Technion–Israel Institute of Technology

[2] Geneva Observatory,University of Geneva,Chemin des Maillettes 51

来源：

Research in Astronomy and Astrophysics | 2016年 / 16卷 / 06期

关键词：

galaxies:active; galaxies:clusters:general; galaxies:groups:individual(NGC 5813); galaxies:jets;

D O I：

暂无

中图分类号：

P154 [星团、星协、恒星云];

学科分类号：

摘要：

We use recent X-ray observations of the intracluster medium(ICM) of the galaxy group NGC 5813 to confront theoretical studies of ICM thermal evolution with the newly derived ICM properties.We argue that the ICM of the cooling flow in the galaxy group NGC 5813 is more likely to be heated by mixing of post-shock gas from jets residing in hot bubbles with the ICM,than by shocks or turbulentheating.Shocks thermalize only a small fraction of their energy in the inner regions of the cooling flow;in order to adequately heat the inner part of the ICM,they would overheat the outer regions by a large factor,leading to its ejection from the group.Heating by mixing,which was found to be much more efficient than turbulent-heating and shocks-heating,hence,rescues the outer ICM of NGC 5813 from its predestined fate according to cooling flow feedback scenarios that are based on heating by shocks.

引用

页码：141 / 146

页数：6

共 50 条

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