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【云台学术报告】2018年7月30日(星期一)下午3:00—4:00 主楼228会议室
2018-03-23  |  作者:  |  【  】 【打印】 【关闭

【学术报告】
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报告题目:Leaked GeV comsic rays from a broken shell of SNR W28

报告人:崔昱东博士

报告人单位:中山大学

报告时间:2018年7月30日(星期一)下午3:00—4:00

报告地点:主楼228会议室

报告语言:中文

报告摘要: 

  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Supernova remnant (SNR) W28 is well known for its classic hadronic scenario, in which the TeV cosmic rays
(CRs) released at the early stage of this intermediate-age SNR illuminate nearby molecular clouds (MCs).
Overwhelming evidence has shown that the northeastern part of the SNR (W28-North) has already encountered the
MC clumps. Through this broken shell W28-North, CRs with an energy down to <1 GeV may be able to be
injected into nearby MCs. To further verify this hadronic scenario, we first analyze nine years of Fermi-LAT data
in/around W28 with energies down to 0.3 GeV. Our Fermi-LAT analysis displays a 10–200 GeV skymap that
spatially matches the known TeV sources HESS J1801–233 (W28-North) and HESS J1800–240 A, B, and C
(240 A B and C) well. At low energy bands, we have discovered a 0.5–1 GeV blob located to the south of
240 B and C, and a low flux of 0.3–1 GeV at 240 A. A hadronic model is build to explain our analysis results and
previous multiwavelength observations of W28. Our model consists of three CR sources: the run-away CRs
escaped from a strong shock, the leaked GeV CRs from the broken shell W28-North, and the local CR sea.
Through modeling the SNR evolution and the CR acceleration and release, we explain the GeV–TeV emission in/
around SNR W28 (except for 240 A) in one model. The damping of the magnetic waves by the neutrals and the
decreased acceleration efficiency are both taken into account in our model due to the intermediate age of
SNR W28.
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