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Probing local cosmic rays using Fermi-LAT observations of a mid-latitude region in the third Galactic quadrant
Shen, Zhao-Qiang1,2; Huang, Xiaoyuan1; Yuan, Qiang1,3; Fan, Yi-Zhong1,3; Wei, Da-Ming1,3
2019-06-03
Source PublicationPHYSICAL REVIEW D
ISSN2470-0010
Volume99Issue:12Pages:10
Corresponding AuthorFan, Yi-Zhong(yzfan@pmo.ac.cn) ; Wei, Da-Ming(dmwei@pmo.ac.cn)
AbstractThe gamma-ray observation of interstellar gas provides a unique way to probe the cosmic rays (CRs) outside the solar system. In this work, we use an updated version of Fermi-LAT data and recent multi-wavelength tracers of interstellar gas to reanalyze a mid-latitude region in the third Galactic quadrant and estimate the local CR proton spectrum. Two gamma-ray production cross section models for pp interaction, the commonly used one from Kamae et al. (2006) and the up-to-date one from Kafexhiu et al. (2014), are adopted separately in the analysis. Both of them can well fit the emissivity and the derived proton spectra roughly resemble the direct measurements from AMS-02 and Voyager 1, but rather different spectral parameters are indicated. A break at 4 +/- 1 GeV c(-1) is shown if the cross section model by Kamae et al. (2006) is adopted. The resulting spectrum is less than or similar to 20% larger than the AMS-02 observation above 15 GeV and consistent with the demodulated spectrum within 2%. The proton spectrum based on the cross section model of Kafexhiu et al. (2014) is about 1.4-1.8 times that of AMS-02 at 2-100 GeV, however the difference decreases to 20% below 10 GeV with respect to the de-modulated spectrum. A spectral break at 20 +/- 11 GeV c(-1) is required in this model. An extrapolation down to 300 MeV is performed to compare with the observation of Voyager I, and we find a deviation of less than or similar to 2.5 sigma for both the models. In general, an approximately consistent CR spectrum can be obtained using gamma-ray observation nowadays, but we still need a better gamma-ray production cross section model to derive the parameters accurately.
DOI10.1103/PhysRevD.99.123001
WOS KeywordGAMMA-RAYS ; MOLECULAR CLOUDS ; EMISSION ; GAS ; CEPHEUS ; DUST
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000470868300002
PublisherAMER PHYSICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27027
Collection中国科学院紫金山天文台
Corresponding AuthorFan, Yi-Zhong; Wei, Da-Ming
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100012, Peoples R China
3.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Shen, Zhao-Qiang,Huang, Xiaoyuan,Yuan, Qiang,et al. Probing local cosmic rays using Fermi-LAT observations of a mid-latitude region in the third Galactic quadrant[J]. PHYSICAL REVIEW D,2019,99(12):10.
APA Shen, Zhao-Qiang,Huang, Xiaoyuan,Yuan, Qiang,Fan, Yi-Zhong,&Wei, Da-Ming.(2019).Probing local cosmic rays using Fermi-LAT observations of a mid-latitude region in the third Galactic quadrant.PHYSICAL REVIEW D,99(12),10.
MLA Shen, Zhao-Qiang,et al."Probing local cosmic rays using Fermi-LAT observations of a mid-latitude region in the third Galactic quadrant".PHYSICAL REVIEW D 99.12(2019):10.
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