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Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma rays with spatially-dependent propagation
Guo, Yi-Qing1; Yuan, Qiang2,3
2018-03-13
Source PublicationPHYSICAL REVIEW D
ISSN2470-0010
Volume97Issue:6Pages:8
Corresponding AuthorYuan, Qiang(yuanq@pmo.ac.cn)
AbstractRecent direct measurements of Galactic cosmic ray spectra by balloon/space-borne detectors reveal spectral hardenings of all major nucleus species at rigidities of a few hundred GV. The all-sky diffuse gamma-ray emissions measured by the Fermi Large Area Telescope also show spatial variations of the intensities and spectral indices of cosmic rays. These new observations challenge the traditional simple acceleration and/or propagation scenario of Galactic cosmic rays. In this work, we propose a spatially dependent diffusion scenario to explain all these phenomena. The diffusion coefficient is assumed to be anticorrelated with the source distribution, which is a natural expectation from the charged particle transportation in a turbulent magnetic field. The spatially dependent diffusion model also gives a lower level of anisotropies of cosmic rays, which are consistent with observations by underground muons and air shower experiments. The spectral variations of cosmic rays across the Galaxy can be properly reproduced by this model.
DOI10.1103/PhysRevD.97.063008
WOS KeywordSUPERNOVA-REMNANTS ; INTERSTELLAR-MEDIUM ; HELIUM SPECTRA ; ANISOTROPY ; TEV ; REACCELERATION ; ORIGIN ; PROTON ; GALAXY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000427315600004
PublisherAMER PHYSICAL SOC
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22359
Collection中国科学院紫金山天文台
Corresponding AuthorYuan, Qiang
Affiliation1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Guo, Yi-Qing,Yuan, Qiang. Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma rays with spatially-dependent propagation[J]. PHYSICAL REVIEW D,2018,97(6):8.
APA Guo, Yi-Qing,&Yuan, Qiang.(2018).Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma rays with spatially-dependent propagation.PHYSICAL REVIEW D,97(6),8.
MLA Guo, Yi-Qing,et al."Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma rays with spatially-dependent propagation".PHYSICAL REVIEW D 97.6(2018):8.
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