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arXiv 0910.4381astro-ph.HE
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gamma-ray双星LS I +61 303的相关X射线和甚高能辐射

Correlated X-ray and Very High Energy emission in the gamma-ray binary LS I +61 303

The MAGIC Collaboration, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, D. Bastieri, J. Becerra González, J. K. B… 展开作者

The MAGIC Collaboration, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, O. Blanch Bigas, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, D. Bose, I. Braun, T. Bretz, D. Britzger, M. Camara, E. Carmona, A. Carosi, P. Colin, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, F. Dazzi, A. De Angelis, E. de Cea del Pozo, R. De los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, N. Godinovic, F. Goebel, D. Hadasch, A. Herrero, D. Hildebrand, D. Höhne-Mönch, J. Hose, D. Hrupec, C. C. Hsu, T. Jogler, S. Klepser, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, J. M. Miranda, R. Mirzoyan, H. Miyamoto, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, R. Orito, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, I. Puljak, I. Reichardt, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, M. Salvati, M. Sánchez-Conde, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, S. N. Shore, N. Sidro, A. Sierpowska-Bartosik, A. Sillanpää, J. Sitarek, D. Sobczynska, F. Spanier, S. Spiro, A. Stamerra, L. S. Stark, T. Suric, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, R. M. Wagner, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, A. Falcone, L. Vetere, N. Gehrels, S. Trushkin, V. Dhawan, P. Reig

摘要:

发射极高能γ射线的X射线双星的发现引发了人们对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,这些双星系统提供了沿偏心轨道的可变条件。尽管如此,其中一些系统的性质,以及产生VHE排放的加速粒子的性质尚不清楚。为了回答这些悬而未决的问题,我们在2007年9月进行了VHE伽马射线发射X射线二进制LS I +61 303的多波长活动,包括MAGIC望远镜,XMM-牛顿和斯威夫特在60%的轨道上。我们发现同时爆发在X射线和VHE波段,峰值在相位0.62和类似的形状在两个波长。对爆发期间获得的同时X射线/VHE对的线性拟合产生r=0.97的相关系数,而对所有同时对的线性拟合提供r=0.81。由于对观测者的VHE发射的可变吸收对于这里报告的数据是不期望的,发现的相关性表明在发射过程中的一致性。假设它们是由一个单一的粒子人口占主导地位,无论是强子或轻子,X射线/VHE通量比有利于轻子模型。这一事实与探测到的光子指数一起表明,在LS I +61 303中,X射线是产生VHE发射的相同电子的同步辐射的结果,VHE发射是恒星光子的逆康普顿散射的结果。

英文摘要:

The discovery of very high energy (VHE) gamma-ray emitting X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems, which provide variable conditions along eccentric orbits. Despite this, the nature of some of these systems, and of the accelerated particles producing the VHE emission, is unclear. To answer some of these open questions, we conducted a multiwavelength campaign of the VHE gamma-ray emitting X-ray binary LS I +61 303 including the MAGIC telescope, XMM-Newton, and Swift during 60% of an orbit in 2007 September. We detect a simultaneous outburst at X-ray and VHE bands, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the simultaneous X-ray/VHE pairs obtained during the outburst yields a correlation coefficient of r=0.97, while a linear fit to all simultaneous pairs provides r=0.81. Since a variable absorption of the VHE emission towards the observer is not expected for the data reported here, the correlation found indicates a simultaneity in the emission processes. Assuming that they are dominated by a single particle population, either hadronic or leptonic, the X-ray/VHE flux ratio favors leptonic models. This fact, together with the detected photon indices, suggests that in LS I +61 303 the X-rays are the result of synchrotron radiation of the same electrons that produce VHE emission as a result of inverse Compton scattering of stellar photons.

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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