Revisit to centaurus a as a point source of ultra-high-energy cosmic rays
- Title
- Revisit to centaurus a as a point source of ultra-high-energy cosmic rays
- Author
- 김항배
- Keywords
- Ultra-high energy cosmic rays; Active galactic nuclei; Centaurus A; Intergalactic magnetic field
- Issue Date
- 2013-02
- Publisher
- 한국물리학회 Korean Physical SOC
- Citation
- Journal of the Korean Physical Society, Feb 2013, 62(4), P.708-712, 5P.
- Abstract
- The void regions found in the arrival direction distribution of ultra-high-energy cosmic rays (UHECRs) observed by the Pierre Auger Observatory (PAO) may be an important clue in UHECR source hunting. We claim that there is a circular void band structure around the Centaurus A (Cen A) direction. We incorporated this observed void structure in the background contribution into the Cen A dominance model to improve the fitting of the arrival direction distribution. The best fit is obtained for the Cen A contribution fraction f (C) = 0.14 (The observed fraction at PAO is f (C,PAO) = 0.27, which means that 18 out of 69 observed UHECR are contributed by Cen A.) and the smearing angle theta (s) = 12A degrees with a maximum likelihood of L (max)= 0.68. The estimate for the intergalactic magnetic fields in the vicinity of the Cen A direction based on the UHECRs contributed by Cen A is B a parts per thousand 24Z (-1)(a"" (c) /M-pc)(-1/2) nG.
- URI
- http://link.springer.com/article/10.3938%2Fjkps.62.708http://hdl.handle.net/20.500.11754/43909
- ISSN
- 0374-4884; 3744-4884
- DOI
- 10.3938/jkps.62.708
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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