Medium scale anisotropy in the TeV cosmic ray flux observed by ARGO-YBJ
文献类型：期刊论文
| 作者 | ARGO-YBJ Collaboration |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2013 |
| 卷号 | 88期号:8 |
| 关键词 | EXTRAGALACTIC MAGNETIC-FIELDS MILAGRO HOT-SPOTS GAMMA-RAYS INTERSTELLAR DETECTOR CALIBRATION SUPERNOVA EMISSION ORIGIN REGION |
| 通讯作者 | Di Sciascio, G (reprint author), Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Via Ric Sci 1, I-00133 Rome, Italy. |
| 英文摘要 | Measuring the anisotropy of the arrival direction distribution of cosmic rays provides important information on the propagation mechanisms and the identification of their sources. In fact, the flux of cosmic rays is thought to be dependent on the arrival direction only due to the presence of nearby cosmic ray sources or particular magnetic-field structures. Recently, the observation of unexpected excesses at TeV energy down to an angular scale as narrow as similar to 10 degrees raised the possibility that the problem of the origin of Galactic cosmic rays may be addressed by studying the anisotropy. The ARGO-YBJ experiment is a full-coverage extensive air showers array, sensitive to cosmic rays with the energy threshold of a few hundred GeV. Searching for small-size deviations from the isotropy, the ARGO-YBJ Collaboration explored the declination region delta similar to -20 degrees-80 degrees, making use of about 3.7 x 10(11) events collected from November 2007 to May 2012. In this paper, the detection of different significant (up to 13 standard deviations) medium-scale anisotropy regions in the arrival directions of cosmic rays is reported. The observation was performed with unprecedented detail. The relative excess intensity with respect to the isotropic flux extends up to 10(-3). The maximum excess occurs for proton energies of 10- 20 TeV, suggesting the presence of unknown features of the magnetic fields the charged cosmic rays propagate through, or some contribution of nearby sources never considered so far. The observation of new weaker few- degree excesses throughout the sky region 195 degrees <= R.A. <= 290 degrees is reported for the first time. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000325170000001 |
| 公开日期 | 2016-02-25 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/213608]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | ARGO-YBJ Collaboration. Medium scale anisotropy in the TeV cosmic ray flux observed by ARGO-YBJ[J]. PHYSICAL REVIEW D,2013,88(8). |
| APA | ARGO-YBJ Collaboration.(2013).Medium scale anisotropy in the TeV cosmic ray flux observed by ARGO-YBJ.PHYSICAL REVIEW D,88(8). |
| MLA | ARGO-YBJ Collaboration."Medium scale anisotropy in the TeV cosmic ray flux observed by ARGO-YBJ".PHYSICAL REVIEW D 88.8(2013). |
入库方式： OAI收割
来源：高能物理研究所
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