来自Westerlund 2的VHE γ射线和对推断能量学的影响
VHE gamma-rays from Westerlund 2 and implications for the inferred energetics
摘要：
H.E.S.S.最近，一个合作组织报道了VHE伽马射线发射的发现，与年轻的星团Westerlund 2一致。这个系统是已知的拥有大量热的大质量恒星，特别是WR双星WR 20 a。粒子加速到TeV的能量在Westerlund 2可以在几个替代方案中完成，因此，我们只讨论能量约束的基础上，在系统中的总可用动能，各自的集群成员的实际质量损失率，和隐含的伽马射线生产过程，如逆康普顿散射或中性π衰变。根据推测的伽马射线光度为10^35 erg/s的量级，在考虑风聚集存在与否的情况下，讨论了Westerlund 2星团中将可用的动能转化为与恒星风相关的非热辐射的效率。
英文摘要：
The H.E.S.S. collaboration recently reported the discovery of VHE gamma-ray emission coincident with the young stellar cluster Westerlund 2. This system is known to host a population of hot, massive stars, and, most particularly, the WR binary WR20a. Particle acceleration to TeV energies in Westerlund 2 can be accomplished in several alternative scenarios, therefore we only discuss energetic constraints based on the total available kinetic energy in the system, the actual mass loss rates of respective cluster members, and implied gamma-ray production from processes such as inverse Compton scattering or neutral pion decay. From the inferred gamma-ray luminosity of the order of 10^35 erg/s, implications for the efficiency of converting available kinetic energy into non-thermal radiation associated with stellar winds in the Westerlund 2 cluster are discussed under consideration of either the presence or absence of wind clumping.
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