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VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula?
Xin, Yuliang1; Zeng, Houdun1; Liu, Siming1,2; Fan, Yizhong1,2; Wei, Daming1,2
2019-11-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume885Issue:2Pages:6
Corresponding AuthorXin, Yuliang(yixin@pmo.ac.cn)
AbstractWe report the detection of GeV ?-ray emission from the very-high-energy ?-ray source VER J2227+608 associated with the ?tail? region of supernova remnant (SNR) G106.3+2.7. The GeV ?-ray emission is extended and spatially coincident with molecular clouds traced by CO emission. The broadband GeV to TeV emission of VER J2227+608 can be well fitted by a single power-law function with an index of 1.90 & xfffd;& xfffd;0.04, without obvious indication of spectral cutoff toward high energies. The pure leptonic model for the ?-ray emission can be marginally ruled out by the X-ray and TeV data. In the hadronic model, the low energy content of CRs and the hard ?-ray spectrum, in combination with the center bright source structure, suggest that VER J2227+608 may be powered by the Pulsar wind nebula instead of shocks of the SNR. And the cutoff energy of the proton distribution needs to be higher than ?400 TeV, which makes it an attractive PeVatron candidate. Future observations by the upcoming Large High Altitude Air Shower Observatory and the Cherenkov Telescope Array in the north could distinguish these models and constrain the maximum energy of cosmic rays in SNRs.
KeywordGamma-rays Non-thermal radiation sources Cosmic rays Extrasolar radiation Supernova remnants Molecular clouds Cosmic ray astronomy Cosmic ray sources Extended radiation sources Astronomical radiation sources Gamma-ray sources Diffuse nebulae
DOI10.3847/1538-4357/ab48ee
WOS KeywordGAMMA-RAY EMISSION ; GALACTIC SUPERNOVA-REMNANTS ; PSR J2229+6114 ; PLANE ; G106.3+2.7 ; CATALOG ; FIELD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000499843500001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35131
Collection中国科学院紫金山天文台
Corresponding AuthorXin, Yuliang
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210033, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Xin, Yuliang,Zeng, Houdun,Liu, Siming,et al. VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula?[J]. ASTROPHYSICAL JOURNAL,2019,885(2):6.
APA Xin, Yuliang,Zeng, Houdun,Liu, Siming,Fan, Yizhong,&Wei, Daming.(2019).VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula?.ASTROPHYSICAL JOURNAL,885(2),6.
MLA Xin, Yuliang,et al."VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula?".ASTROPHYSICAL JOURNAL 885.2(2019):6.
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