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arXiv 1306.6738astro-ph.IMastro-ph.HE
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Cosmic Ray空气簇射的偏振微波辐射观测

Observation of Polarised Microwave Emission from Cosmic Ray Air Showers

R. Smida, F. Werner, R. Engel, J. C. Arteaga-Velazquez, K. Bekk, M. Bertaina, J. Bluemer, H. Bozdog, I. M. Brancus, A. Chiavassa, F. Cossavella, F. Di Pierro, P… 展开作者

R. Smida, F. Werner, R. Engel, J. C. Arteaga-Velazquez, K. Bekk, M. Bertaina, J. Bluemer, H. Bozdog, I. M. Brancus, A. Chiavassa, F. Cossavella, F. Di Pierro, P. Doll, B. Fuchs, D. Fuhrmann, C. Grupen, A. Haungs, D. Heck, J. R. Hoerandel, D. Huber, T. Huege, K. -H. Kampert, D. Kang, H. Klages, M. Kleifges, O. Kroemer, K. Link, P. Luczak, M. Ludwig, H. J. Mathes, H. J. Mayer, S. Mathys, M. Melissas, C. Morello, P. Neunteufel, J. Oehlschlaeger, N. Palmieri, J. Pekala, T. Pierog, J. Rautenberg, H. Rebel, M. Riegel, M. Roth, F. Salamida, H. Schieler, S. Schoo, F. G. Schroeder, O. Sima, J. Stasielak, G. Toma, G. C. Trinchero, M. Unger, M. Weber, A. Weindl, H. Wilczynski, M. Will, J. Wochele, J. Zabierowski

摘要:

我们报告了对广泛空气簇射微波无线电发射基本特征的首次直接测量。利用KASCADE-Grande空气簇射阵列提供的触发器,读出了CROME(通过微波发射进行宇宙线观测)实验的微波天线信号,并搜索了高能空气簇射的无线电发射特征。已经探测到30多个能量超过$3\times10^{16}$ \,eV的簇射的微波信号。这封信中提出的观测结果与GHz频率范围内的主要前向波束、相干和极化发射过程一致。各向同性,非偏振辐射是不利的占主导地位的发射模型。测量结果表明,微波辐射提供了一种新的手段,研究在非常高的能量的空气簇射。

英文摘要:

We report on the first direct measurement of the basic features of microwave radio emission from extensive air showers. Using a trigger provided by the KASCADE-Grande air shower array, the signals of the microwave antennas of the CROME (Cosmic-Ray Observation via Microwave Emission) experiment have been read out and searched for signatures of radio emission by high-energy air showers. Microwave signals have been detected for more than 30 showers with energies above $3\times10^{16}$\,eV. The observations presented in this Letter are consistent with a mainly forward-beamed, coherent and polarised emission process in the GHz frequency range. An isotropic, unpolarised radiation is disfavoured as the dominant emission model. The measurements show that microwave radiation offers a new means of studying air showers at very high energy.

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