Gamma-Ray Burst Peak Duration as a Function of Energy | Zendy

E. E. Fenimore | Zendy; J. J. M. in't Zand | Zendy; J. P. Norris | Zendy; J. T. Bonnell | Zendy; Robert J. Nemiroff | Zendy

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Gamma-Ray Burst Peak Duration as a Function of Energy

Author(s) -

E. E. Fenimore,

J. J. M. in't Zand,

J. P. Norris,

J. T. Bonnell,

Robert J. Nemiroff

Publication year - 1995

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 - 10.1086/309603

Subject(s) - autocorrelation , gamma ray burst , physics , astrophysics , energy (signal processing) , power law , range (aeronautics) , exponential function , spectral index , function (biology) , spectral density , statistical physics , computational physics , statistics , astronomy , quantum mechanics , mathematics , spectral line , materials science , mathematical analysis , composite material , evolutionary biology , biology

Gamma-ray burst time histories often consist of many peaks. These peaks tendto be narrower at higher energy. If gamma-ray bursts are cosmological, theenergy dependence of gamma-ray burst time scales must be understood in order tocorrect the time scale dependence due to the expansion of the universe. Byusing the average autocorrelation function and the average pulse width, we showthat the narrowing with energy follows, quite well, a power law. The power lawindex is about -0.4. This is the first quantitative relationship betweentemporal and spectral structure in gamma-ray bursts. It is unclear what physicscauses this relationship. The average autocorrelation has a universal shapesuch that one energy range scales linearly with time into all other energyranges. This shape is approximately the sum of two exponential.Comment: 19 pages plus figures, uuencoded tar compressed Postscript. Submitted for publication. Also available in Postscript format at ftp://sstcx1.lanl.gov/pub/grb/energy_stretch.p

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