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Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope
Yang, Rui-zhi1,2; de Ona Wilhelmi, Emma1,5; Aharonian, Felix1,3,4
2014-06-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume566Issue:0Pages:0
AbstractWe report the results of our study of the energy spectra and absolute fluxes of cosmic rays (CRs) in the Local Galaxy based on a five-year gamma-ray observation with the Fermi Large Area Telescope (LAT) of eight nearby giant molecular clouds (GMCs) belonging to the Gould Belt. The gamma-ray signals obtained with high statistical significance allow the determination of gamma-ray spectra above 300 MeV with adequate precision for extraction of the energy distributions of CRs in these clouds. Remarkably, both the derived spectral indices and the absolute fluxes of CR protons in the energy interval 10-100 GeV agree with the recent direct measurements of local CRs by the PAMELA experiment. This is strong evidence of a quite homogeneous distribution of CRs, at least within several hundred parsecs of the Local Galaxy. Combined with the well established energy-dependent time of escape of CRs from the Galaxy, tau(E) proportional to E-delta with delta approximate to 0.5-0.6, the measured spectrum implies a CR spectral index of the (acceleration) source of approximate to E-2.3. At low energies, the spectra of gamma rays appear to vary from one cloud to another. This implies spatial variations of the energy spectra of CRs below 10 GeV, which at such low energies could be explained naturally by both the impact of the propagation effects and the contribution of CR locally accelerated inside the clouds.
KeywordCosmic Rays Gamma Rays: Ism Ism: Clouds
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361/201321044
WOS KeywordGAMMA-RAYS ; MILKY-WAY ; CO SURVEY ; PROPAGATION ; SPECTRUM ; REMNANTS ; PROTON ; PAMELA ; GAS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000338681500004
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10557
Collection暗物质和空间天文实验室
Affiliation1.Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
2.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Dublin Inst Adv Studies, Dublin 2, Ireland
4.Gran Sasso Sci Inst, I-67100 Laquila, AQ, Italy
5.CSIC, Inst Cincies Espai, IEEC, Bellaterra 08193, Spain
Recommended Citation
GB/T 7714
Yang, Rui-zhi,de Ona Wilhelmi, Emma,Aharonian, Felix. Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope[J]. ASTRONOMY & ASTROPHYSICS,2014,566(0):0.
APA Yang, Rui-zhi,de Ona Wilhelmi, Emma,&Aharonian, Felix.(2014).Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope.ASTRONOMY & ASTROPHYSICS,566(0),0.
MLA Yang, Rui-zhi,et al."Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope".ASTRONOMY & ASTROPHYSICS 566.0(2014):0.
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