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On the Energy Coupling Efficiency of AGN Outbursts in Galaxy Clusters
Duan, Xiaodong1,2; Guo, Fulai1,2
2020-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume896Issue:2Pages:17
AbstractActive galactic nucleus (AGN) jets are believed to be important in solving the cooling flow problem in the intracluster medium (ICM), while the detailed mechanism is still under debate. Here we present a systematic study on the energy coupling efficiency eta(cp), the fraction of AGN jet energy transferred to the ICM. We first estimate the values of eta(cp)analytically in two extreme cases, which are further confirmed and extended with a parameter study of spherical outbursts in a uniform medium using hydrodynamic simulations. We find that eta(cp)increases from similar to 0.4 for a weak isobaric injection to greater than or similar to 0.8 for a powerful point injection. For any given outburst energy, we find two characteristic outburst powers that separate these two extreme cases. We then investigate the energy coupling efficiency of AGN jet outbursts in a realistic ICM with hydrodynamic simulations, finding that jet outbursts are intrinsically different from spherical outbursts. For both powerful and weak jet outbursts,eta(cp)is typically around 0.7-0.9, partly due to the nonspherical nature of jet outbursts, which produce backflows emanating from the hot spots, significantly enhancing the ejecta-ICM interaction. While for powerful outbursts a dominant fraction of the energy transferred from the jet to the ICM is dissipated by shocks, shock dissipation only accounts for less than or similar to 30% of the injected jet energy for weak outbursts. While both powerful and weak outbursts could efficiently heat cooling flows, powerful thermal-energy-dominated jets are most effective in delaying the onset of the central cooling catastrophe.
KeywordIntracluster medium Active galaxies Radio jets High energy astrophysics Galaxy clusters Active galactic nuclei Low-luminosity active galactic nuclei Radio active galactic nuclei Hydrodynamics Hydrodynamical simulations Astronomical simulations
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences
DOI10.3847/1538-4357/ab93b3
WOS KeywordSPHERICALLY SYMMETRIC OUTBURST ; DEEP CHANDRA OBSERVATION ; SOUND-WAVE GENERATION ; X-RAY CAVITIES ; INTRACLUSTER MEDIUM ; PERSEUS CLUSTER ; RADIO GALAXIES ; COOLING FLOWS ; BLACK-HOLES ; COSMIC-RAYS
Language英语
Funding ProjectNational Natural Science Foundation of China[11873072] ; National Natural Science Foundation of China[11633006] ; Natural Science Foundation of Shanghai[18ZR1447100] ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences[QYZDB-SSW-SYS033] ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences[QYZDJ-SSW-SYS008]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000545035000001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82904
Collection中国科学院国家天文台
Corresponding AuthorGuo, Fulai
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Duan, Xiaodong,Guo, Fulai. On the Energy Coupling Efficiency of AGN Outbursts in Galaxy Clusters[J]. ASTROPHYSICAL JOURNAL,2020,896(2):17.
APA Duan, Xiaodong,&Guo, Fulai.(2020).On the Energy Coupling Efficiency of AGN Outbursts in Galaxy Clusters.ASTROPHYSICAL JOURNAL,896(2),17.
MLA Duan, Xiaodong,et al."On the Energy Coupling Efficiency of AGN Outbursts in Galaxy Clusters".ASTROPHYSICAL JOURNAL 896.2(2020):17.
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