Correlation Studies Between Ultra-high Energy Cosmic Rays and Fermi Gamma-ray Sources
We study possible correlations between ultrahigh energy cosmic rays (UHECRs) observed by Auger, AGASAand Yakutsk, and nearby active galactic nuclei (AGNs) and Fermi gamma-ray sources. The deflection effects by anew Galactic magnetic field (GMF) model are considered. A correlation between the Auger cosmic-ray events andnearby AGNs with a significance level of 4 sigma is found for the Auger UHECR data sets with or without deflectioncorrection. Marginal correlations between the Auger events and Fermi gamma-ray sources, and between Auger/AGASAevents and gamma-ray AGNs are found when the deflections calculated by the GMF model are considered. However, nocorrelation is found between the Yakutsk data and gamma-ray sources. Four gamma-ray loud AGNs, NGC 4945, ESO323-G77, NGC 6951, and Cen A, within 100 Mpc have UHECR events within 3 degrees from their positions, whichcould potentially be cosmic ray accelerators. A large number of unidentified gamma-ray sources could also be UHECRsource candidates.
comic rays - gamma-rays - galaxies - magnetic fields
WEI WANG YUNYING JIANG JINLIN HAN
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
国际会议
北京
英文
1-4
2011-08-11（万方平台首次上网日期，不代表论文的发表时间）