Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model | Zendy

Ryo Yamazaki | Zendy; Kunihito Ioka | Zendy; Takashi Nakamura | Zendy

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Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model

Author(s) -

Ryo Yamazaki,

Kunihito Ioka,

Takashi Nakamura

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/421084

Subject(s) - physics , isotropy , gamma ray burst , energy (signal processing) , astrophysics , jet (fluid) , monte carlo method , transient (computer programming) , event (particle physics) , relation (database) , computational physics , optics , mechanics , statistics , mathematics , quantum mechanics , computer science , operating system , database

Using a simple uniform jet model of prompt emissions of gamma-ray bursts(GRBs), we reproduce the observed peak energy--isotropic energy relation. AMonte Carlo simulation shows that the low-isotropic energy part of the relationis dominated by events viewed from off-axis directions, and the number of theoff-axis events is about one-third of the on-axis emissions. We also computethe observed event rates of the GRBs, the X-ray-rich GRBs, and the X-rayflashes detected by HETE-2, and we find that they are similar.Comment: 11 pages, 2 eps figure

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