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Probing the Physics of Mechanical AGN Feedback with Radial Elongations of X-Ray Cavities
Guo, Fulai1,2
2020-11-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume903Issue:1Pages:8
AbstractMechanical active galactic nucleus (AGN) feedback plays a key role in massive galaxies, galaxy groups, and clusters. However, the energy content of AGN jets that mediate this feedback process is still far from clear. Here we present a preliminary study of radial elongations tau of a large sample of X-ray cavities, which are apparently produced by mechanical AGN feedback. All of the cavities in our sample are elongated along the angular (type I) or jet directions (type II), or nearly circular (type III). The observed value of tau roughly decreases as the cavities rise buoyantly, confirming the same trend found in hydrodynamic simulations. For young cavities, both type-I and type-II cavities exist, and the latter dominates. Assuming a spheroidal cavity shape, we derive an analytical relation between the intrinsic radial elongation tau, showing that projection effect makes cavities appear more circular, but does not change type-I cavities into type-II ones, or vice versa. We summarize radial elongations of young cavities in simulations, finding that (tau) over bar increases with the kinetic fraction of AGN jets. While mild jets always produce type-II cavities, thermal-energy-dominated strong jets produce type-I cavities, and kinetic-energy-dominated strong jets produce type-II cavities. Our results suggest that some AGN jets are strong and dominated by thermal energy (or cosmic rays). However, these jets do not dominate in AGN feedback. If most jets are dominated by nonkinetic energies, they should be mainly mild jets. If most jets are strong, they must be mainly dominated by the kinetic energy.
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 ; Chinese Academy of 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 ; Chinese Academy of 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 ; Chinese Academy of 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 ; Chinese Academy of Sciences
DOI10.3847/1538-4357/abb777
WOS KeywordGALACTIC NUCLEUS FEEDBACK ; INTRACLUSTER MEDIUM ; CHANDRA OBSERVATION ; GALAXY CLUSTER ; XMM-NEWTON ; COOL-CORE ; HOT GAS ; BUBBLES ; SHOCKS ; SIMULATIONS
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[QYZDB-SSW-SYS033] ; Chinese Academy of 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 ; Chinese Academy of 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 ; Chinese Academy of 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 ; Chinese Academy of 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 ; Chinese Academy of Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000584019200001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81222
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, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Guo, Fulai. Probing the Physics of Mechanical AGN Feedback with Radial Elongations of X-Ray Cavities[J]. ASTROPHYSICAL JOURNAL,2020,903(1):8.
APA Guo, Fulai.(2020).Probing the Physics of Mechanical AGN Feedback with Radial Elongations of X-Ray Cavities.ASTROPHYSICAL JOURNAL,903(1),8.
MLA Guo, Fulai."Probing the Physics of Mechanical AGN Feedback with Radial Elongations of X-Ray Cavities".ASTROPHYSICAL JOURNAL 903.1(2020):8.
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