Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-10
Astrophys.J. 690 (2009) L14
Astronomy and Astrophysics
Astrophysics
4 pages, accepted for publication in APJL
Scientific paper
10.1088/0004-637X/690/1/L14
We study about ultra-high-energy cosmic rays (UHECRs) from transient sources, propagating in the Galactic and intergalactic space. Based on the recent observational results, we also estimate upper and lower bounds on the rate of transient UHECR sources and required isotropic cosmic-ray energy input per burst as 0.1 Gpc^-3 yr^-1 < rho_0 < 10^3.5 Gpc^-3 yr^-1 and 10^49.5 ergs < E_HECR^iso < 10^54 ergs, through constraining the apparent burst duration, i.e., dispersion in arrival times of UHECRs. Based on these bounds, we discuss implications for proposed candidates such as gamma-ray bursts and active galactic nuclei.
Murase Kohta
Takami Hajime
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