期刊
ASTROPHYSICAL JOURNAL
卷 885, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab48ee
关键词
Gamma-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
资金
- National Key RAMP
- D Program of China [2018YFA0404203, 2018YFA0404204]
- NSFC [U1738122, U1931204, 11761131007]
- Natural Science Foundation for Young Scholars of Jiangsu Province, China [BK20191109]
- International Partnership Program of Chinese Academy of Sciences [114332KYSB20170008]
We 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.
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