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Young massive clusters as sources of galactic cosmic rays
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主讲人: Ruizhi Yang
地点: KIAA-Auditorium
时间: Thursday, November 12, 2020 4:00PM- 5:00PM
主持 联系人: Zhuo Li
主讲人简介: Ruizhi Yang (University of Science and Technology of China)

The origin of cosmic rays (CRs) is a fundamental problem in astrophysics. Supernova remnants (SNRs) are regarded as the most promising source candidates for the CRs in our Galaxy. However, the recent multi-wavelength  observations reveal that SNRs cannot account for all the Galactic CRs, especially for the ultra high energy band (~ 1PeV). Due to the particle acceleration capacity, young massive clusters (YMCs) are considered as an alternative CR source population. The recent gamma-ray observations found a universal hard gamma-ray spectra and 1/r CR distributions in the vicinity of such sources. The efficiency of conversion of kinetic energy of stellar winds to CRs can be as high as 10 percent implying that the YMCs may operate as CR accelerators with a dominant contribution to the flux of highest energy galactic CRs.

Speaker: Ruizhi Yang (University of Science and Technology of China)
Place: KIAA-Auditorium
Host: Zhuo Li
Time:   Thursday, November 12, 2020 4:00PM- 5:00PM