Gamma-ray emission from Wolf-Rayet binaries
Gamma-ray emission from Wolf-Rayet binaries
复制标题
沃尔夫-拉叶双星的伽马射线发射
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Romero
中科院分区：
文献类型：
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作者：
P. Benaglia;G. Romero
在早期型双星的碰撞风区，电子可以被加速到相对论能量显示幂律谱，从几个WR+OB系统的非热无线电发射的检测证明。位于恒星之间的粒子加速区暴露在强光子场中，电子的逆康普顿冷却可能导致大量的高能非热通量。在特定的情况下，碰撞风区域中磁场与光子场的能量密度之比将决定一个给定的源是否能产生显著的伽马射线发射。本文根据最近的射电和γ射线观测结果对WR 140、WR 146和WR 147进行了研究。我们表明，与合理的假设的磁场强度WR 140可以产生的伽马射线通量从EGRET源3EG J2022+4317。WR 146和WR 147低于检测阈值，但新的和即将推出的仪器，如INTEGRAL和GLAST可能会检测到它们的非热发射。
In the colliding wind region of early-type binaries, electrons can be accelerated up to relativistic energies displaying power-law spectra, as demonstrated by the detection of non-thermal radio emission from several WR+OB systems. The particle acceleration region, located between the stars, is exposed to strong photon fields in such a way that inverse Compton cooling of the electrons could result in a substantial high-energy non-thermal flux. In particular cases, the ratio of the energy densities of magnetic to photon fields in the colliding wind region will determine whether a given source can produce or not significant gamma-ray emission. We present here a study of the binaries WR 140, WR 146, and WR 147 in the light of recent radio and gamma-ray observations. We show that with reasonable assumptions for the magnetic field strength WR 140 can produce the gamma-ray flux from the EGRET source 3EG J2022+4317. WR 146 and WR 147 are below the detection threshold, but new and forthcoming instruments like INTEGRAL and GLAST might detect non-thermal emission from them.