X‐Ray–rich Gamma‐Ray Bursts, Photospheres, and Variability | Zendy

P. Mészáros | Zendy; E. RamirezRuiz | Zendy; M. J. Rees | Zendy; Bing Zhang | Zendy

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X‐Ray–rich Gamma‐Ray Bursts, Photospheres, and Variability

Author(s) -

P. Mészáros,

E. RamirezRuiz,

M. J. Rees,

Bing Zhang

Publication year - 2002

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 - 10.1086/342611

Subject(s) - physics , astrophysics , photosphere , radius , limiting , luminosity , light curve , gamma ray burst , gamma ray , x ray , cosmic ray , astronomy , spectral line , nuclear physics , mechanical engineering , computer security , galaxy , computer science , engineering

We investigate the relationship between the quasi-thermal baryon-relatedphotosphere in relativistic outflows, and the internal shocks arising outsidethem, which out to a limiting radius may be able to create enough pairs toextend the optically thick region. Variable gamma-ray light curves are likelyto arise outside this limiting pair-forming shock radius, while X-ray excessbursts may arise from shocks occurring below it; a possible relation to X-rayflashes is discussed. This model leads to a simple physical interpretation ofthe observational gamma-ray variability-luminosity relation.Comment: accepted in Ap.J. 6/20/02; subm 5/8/02; aaspp4, 12 pages, 1 fi

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