A Unified Model of Short and Long Gamma-Ray Bursts, X-Ray-rich Gamma-Ray Bursts, and X-Ray Flashes | Zendy

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

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A Unified Model of Short and Long Gamma-Ray Bursts, X-Ray-rich Gamma-Ray Bursts, and X-Ray Flashes

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 - 10.1086/421872

Subject(s) - gamma ray burst , physics , astrophysics , line of sight , x ray , jet (fluid) , event (particle physics) , afterglow , sight , astronomy , optics , mechanics

Taking into account the recent suggestion that a short gamma-ray burst (GRB)looks like the first 1 sec of a long GRB, we propose that the jet of a GRBconsists of multiple sub-jets or sub-shells (i.e., an inhomogeneous jet model).The multiplicity of the sub-jets along a line of sight n_s is an importantparameter. If n_s is large (>> 1) the event looks like a long GRB, while if n_sis small (~1) the event looks like a short GRB. If our line of sight isoff-axis to any sub-jets, the event looks like an X-ray flash or an X-ray richGRB. The log-normal distribution of durations of short and long GRBs are alsosuggested in the same model.Comment: 13 pages, 4 eps figure

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