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arXiv 0804.4606astro-ph
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质子低质量微类星体:高能辐射

The proton low-mass microquasar: high-energy emission

Gustavo E. Romero, Gabriela S. Vila

摘要:

一群身份不明的伽马射线源正在银河系中心周围形成一个类似光环的结构。这些源是高度可变的,因此它们应该与致密物体有关。微类星体是经历相对论喷流吸积的物体;如果这样的物体有一个低质量的、演化的施主恒星,它可能会在星系晕中被发现。如果这些低质量的微类星体能够产生可探测到的伽马射线辐射,那么它们是解释晕高能源的天然候选者。我们的目标是构建低质量微类星体的高能发射模型,这可能会产生显着的亮度在伽马射线域。我们考虑到小质量微类星体喷流中相当一部分的相对论粒子是质子,然后研究了质子同步辐射和质子离子产生对高能辐射的产生。光子空气生产和轻子过程被认为是。我们计算了一些具有不同参数的特定模型,以探索这种情况的可能性。我们发现,重要的光度,在$10^{34}-10^{37}$ erg s $^{-1}$的范围内,可以实现质子同步辐射在伽马射线大面积空间望远镜(GLAST)的能量范围内,和较低的,但仍然显着的光度在较高的能量为一些模型。我们的结论是,“质子微类星体”模型提供了一个非常有趣的替代考虑晕伽马射线源,并提出了各种预测,可能会在不久的将来进行测试的仪器,如GLAST,高能立体系统II(HESS II),主要大气伽马射线成像切伦科夫望远镜II(MAGIC II),和中微子望远镜,如冰立方。

英文摘要:

A population of unidentified gamma-ray sources is forming a structure resembling a halo around the Galactic center. These sources are highly variable, and hence they should be associated with compact objects. Microquasars are objects undergoing accretion with relativistic jets; if such an object has a low-mass, evolved, donor star, it might be found in the Galactic halo. If these low-mass microquasars can generate detectable gamma-ray emission, then they are natural candidates to account for the halo high-energy sources. We aim to construct models for high-energy emission of low-mass microquasars, which could produce a significant luminosity in the gamma-ray domain. We consider that a significant fraction of the relativistic particles in the jets of low-mass microquasars are protons and then we study the production of high-energy emission through proton synchrotron radiation and photopion production. Photopair production and leptonic processes are considered as well. We compute a number of specific models with different parameters to explore the possibilities of this scenario.} We find that important luminosities, in the range of $10^{34}-10^{37}$ erg s$^{-1}$, can be achieved by proton synchrotron radiation in the Gamma-Ray Large Area Space Telescope (GLAST) energy range, and lower, but still significant luminosities at higher energies for some models. We conclude that the "proton microquasar" model offers a very interesting alternative to account for the halo gamma-ray sources and presents a variety of predictions that might be tested in the near future by instruments like GLAST, the High-Energy Stereoscopic System II (HESS II), the Major Atmospheric Gamma-ray Imaging Cherenkov telescope II (MAGIC II), and neutrino telescopes like IceCube.

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