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arXiv 0906.4803astro-ph.HE
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微类星体喷注-团簇相互作用的高能辐射

High-energy emission from jet-clump interactions in microquasars

Anabella T. Araudo, Valenti Bosch-Ramon, Gustavo E. Romero

摘要:

高质量微类星体是由一个大质量恒星和一个吸积致密天体组成的双星系统,相对论喷流从该天体中发射出来。有相当多的观测证据表明,大质量恒星的恒星风是cluplastic。个别团块可能与高质量微类星体中的喷流相互作用,产生高能辐射的爆发。在一些高质量的X射线双星中,例如天鹅座X-1,以及可能在LS 5039和LS I+61 303中发现了伽马射线耀斑。我们预测了高质量微类星体中喷流与星风团相互作用产生的高能辐射。假设一个流体动力学的情况下,射流团相互作用,我们计算的光谱能量分布所产生的占主导地位的非热过程:相对论性韧致辐射,同步辐射和逆康普顿辐射,轻子,强子,质子-质子碰撞。X射线(同步加速器)、高能伽马射线(逆康普顿)和极高能伽马射线(来自中性π介子的衰变)的发射水平很高,不同区域的亮度在~ 10^{32}-10 ^<$35} erg/s之间。光谱能量分布根据具体条件而变化很大。在高能量和非常高的能量下,可以检测到喷流-团簇相互作用,并为在一些高质量X射线双星系统中发现的快速TeV变化提供了解释。我们的模型可以通过高灵敏度的伽马射线天文学来帮助推断有关喷流和cluerous风的属性的信息。

英文摘要:

High-mass microquasars are binary systems consisting of a massive star and an accreting compact object from which relativistic jets are launched. There is considerable observational evidence that winds of massive stars are clumpy. Individual clumps may interact with the jets in high-mass microquasars to produce outbursts of high-energy emission. Gamma-ray flares have been detected in some high-mass X-ray binaries, such as Cygnus X-1, and probably in LS 5039 and LS I+61 303. We predict the high-energy emission produced by the interaction between a jet and a clump of the stellar wind in a high-mass microquasar. Assuming a hydrodynamic scenario for the jet-clump interaction, we calculate the spectral energy distributions produced by the dominant non-thermal processes: relativistic bremsstrahlung, synchrotron and inverse Compton radiation, for leptons, and for hadrons, proton-proton collisions. Significant levels of emission in X-rays (synchrotron), high-energy gamma rays (inverse Compton), and very high-energy gamma rays (from the decay of neutral pions) are predicted, with luminosities in the different domains in the range ~ 10^{32}-10^{35} erg/s. The spectral energy distributions vary strongly depending on the specific conditions. Jet-clump interactions may be detectable at high and very high energies, and provide an explanation for the fast TeV variability found in some high-mass X-ray binary systems. Our model can help to infer information about the properties of jets and clumpy winds by means of high-sensitivity gamma-ray astronomy.

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