DO ULTRAHIGH ENERGY COSMIC RAYS COME FROM ACTIVE GALACTIC NUCLEI AND FERMI γ-RAY SOURCES?
DO ULTRAHIGH ENERGY COSMIC RAYS COME FROM ACTIVE GALACTIC NUCLEI AND FERMI γ-RAY SOURCES?
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DOI：
10.1088/0004-637x/719/1/459
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Yun-ying Jiang;L. Hou;Jin Han;X. Sun;Wei Wang
中科院分区：
文献类型：
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作者：
Yun-ying Jiang;L. Hou;Jin Han;X. Sun;Wei Wang
我们研究了俄歇、AGASA和雅库茨克观测到的高能宇宙线（UHECR）与附近活动星系核（AGN）和费米源之间可能存在的相关性。我们考虑的偏转效应的银河磁场（GMF）模型约束的最新测量。我们发现银河系磁场对UHECR的平均偏转角小于4°。在有或没有偏转校正的俄歇UHECR数据集上，俄歇宇宙线事件与附近活动星系核之间的相关性达到了0.4 σ的显著水平。AGASA/雅库茨克事件与附近活动星系核之间没有相关性。当考虑GMF模型计算的偏转时，发现Auger事件和Fermi源之间以及AGASA事件和Fermi AGN之间存在边缘相关。然而，雅库茨克数据和费米源之间没有发现相关性。一些费米源靠近Auger、AGASA和Yakutsk探测到的UHECR事件的到达方向，其中大多数可能是偶然巧合，而不是附近宇宙中产生UHECR的物体。四个费米源，NGC 4945，ESO 323-G77，NGC 6951和Cen A，在100 Mpc范围内，在距离它们位置3.°1的范围内有UHECR事件，这可能是宇宙射线加速器。然而，只有在优选地在这些方向上检测到更多的UHECR时，才能确认关联。
We study possible correlations between ultrahigh energy cosmic rays (UHECRs), observed by Auger, AGASA, and Yakutsk, and nearby active galactic nuclei (AGNs) and Fermi sources. We consider the deflection effects by a Galactic magnetic field (GMF) model constrained by the most updated measurements. We found that the average deflection angles of UHECRs by the Galactic magnetic fields are less than 4°. A correlation between the Auger cosmic-ray events and nearby AGNs with a significance level of ∼4σ was found for the Auger UHECR data sets with or without deflection correction. No correlation was found between the AGASA/Yakutsk events with nearby AGNs. Marginal correlations between the Auger events and the Fermi sources, and between AGASA events and Fermi AGNs were found when the deflections calculated by the GMF model were considered. However, no correlation was found between the Yakutsk data and Fermi sources. Some Fermi sources are close to the arrival directions of UHECR events detected by Auger, AGASA, and Yakutsk, most of which are probably chance coincidences rather than objects producing UHECRs in the nearby universe. Four Fermi sources, NGC 4945, ESO 323-G77, NGC 6951, and Cen A, within 100 Mpc have UHECR events within 3.°1 from their positions, which could potentially be cosmic-ray accelerators. However, the association can only be confirmed if more UHECRs are preferably detected in these directions.