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Simulating the Fermi Bubbles as Forward Shocks Driven by AGN Jets
Zhang, Ruiyu1,2; Guo, Fulai1,2
2020-05-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume894Issue:2Pages:12
AbstractThe Fermi bubbles are two giant bubbles in gamma-rays lying above and below the Galactic Center (GC). Despite numerous studies on the bubbles, their origin and emission mechanism remain elusive. Here we use a suite of hydrodynamic simulations to study the scenario where the cosmic rays (CRs) in the bubbles are mainly accelerated at the forward shocks driven by a pair of opposing jets from Sgr A*. We find that an active galactic nucleus (AGN) jet event that happened 5-6 Myr ago can naturally reproduce the bilobular morphology of the bubbles, and the postshock gas temperature in the bubbles is heated to similar to 0.4 keV, consistent with recent X-ray observations. The forward shocks compress the hot halo gas, and at low latitudes, the compressed gas shows an X-shaped structure, naturally explaining the biconical X-ray structure in the ROSAT 1.5 keV map in both morphology and X-ray surface brightness. CR acceleration is most efficient in the head regions of the bubbles during the first 2 Myr. The opposing jets release a total energy of similar to 10(55) erg with an Eddington ratio of similar to 10(-3), which falls well in the range of the hot accretion flow mode for black holes. Our simulations further show that the forward shocks driven by spherical winds at the GC typically produce bubbles with much wider bases than observed and could not reproduce the biconical X-ray structure at low latitudes. This suggests that starburst or AGN winds are unlikely the origin of the bubbles in the shock scenario.
KeywordGamma-rays Active galaxies Jets Galactic cosmic rays Galactic center the Milky Way Hydrodynamical simulations Shocks Galaxy jets High energy astrophysics Black holes
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/ab8bd0
WOS KeywordGAMMA-RAY ; PARTICLE ACCELERATION ; GALACTIC-CENTER ; X-RAY ; MICROWAVE ; MILKY ; SIGNATURES ; MODELS ; FLOWS ; WIND
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:000536087400001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/54767
Collection中国科学院国家天文台
Corresponding AuthorGuo, Fulai
Affiliation1.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 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
Zhang, Ruiyu,Guo, Fulai. Simulating the Fermi Bubbles as Forward Shocks Driven by AGN Jets[J]. ASTROPHYSICAL JOURNAL,2020,894(2):12.
APA Zhang, Ruiyu,&Guo, Fulai.(2020).Simulating the Fermi Bubbles as Forward Shocks Driven by AGN Jets.ASTROPHYSICAL JOURNAL,894(2),12.
MLA Zhang, Ruiyu,et al."Simulating the Fermi Bubbles as Forward Shocks Driven by AGN Jets".ASTROPHYSICAL JOURNAL 894.2(2020):12.
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