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arXiv 0907.0992astro-ph.HE
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gamma ray二进制LS I +61 303的MAGIC亮点

The MAGIC highlights of the gamma ray binary LS I +61 303

T. Jogler, N. Puchades, O. Blanch Bigas, V. Bosch-Ramon, J. Cortina, J. Moldón, J. M. Paredes, M. A. Perez-Torres, M. Ribó, J. Rico, D. F. Torres, V. Zabalza, MAGIC collaboration

摘要:

从X射线双星发射TeV伽马射线的发现引发了更好地理解紧凑双星系统中粒子加速,吸收和发射机制的强烈努力。在这里,我们介绍了MAGIC合作的开创性努力,以了解原型系统LS I +61 303的非常高的能量发射。我们报告的可变性质的发射LS I +61 303,并表明,这种发射确实是周期性的。该系统在相位φ =0.6-0.7的TeV能量范围内显示出规则的爆发,在近星点(φ ~ 0.275)没有检测到信号。此外,我们没有发现致密天体沿轨道的光谱变化,光谱能量分布符合指数为Gamma=2.6+-0.2stat +-0.2sys的简单幂律。为了回答一些关于TeV辐射发射过程的公开问题,我们在2007年9月用MAGIC望远镜、XMM-牛顿和斯威夫特进行了一次多波长活动。我们检测到同时爆发的X射线和TeV的能量,在相位0.62和两个波长的形状相似的峰值。对严格同时的X射线/TeV通量对的线性拟合提供r=0.81 - 0.21 + 0.06。在这里,我们提出的意见,并讨论所获得的结果在系统中的排放过程的影响。

英文摘要:

The discovery of emission of TeV gamma rays from X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems. Here we present the pioneering effort of the MAGIC collaboration to understand the very high energy emission of the prototype system LS I +61 303. We report on the variable nature of the emission from LS I +61 303 and show that this emission is indeed periodic. The system shows regular outburst at TeV energies in phase phi=0.6-0.7 and detect no signal at periastron (phi~ 0.275). Furthermore we find no indication of spectral variation along the orbit of the compact object and the spectral energy distribution is compatible with a simple power law with index Gamma=2.6+-0.2_(stat)+-0.2_(sys). To answer some of the open questions concerning the emission process of the TeV radiation we conducted a multiwavelength campaign with the MAGIC telescope, XMM-Newton, and Swift in September 2007. We detect a simultaneous outburst at X-ray and TeV energies, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the strictly simultaneous X-ray/TeV flux pairs provides r=0.81 -0.21 +0.06. Here we present the observations and discuss the implications of the obtained results to the emission processes in the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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