Gamma-ray Burst Spectrum Influenced by the Doppler Effect of Fireballs
نویسندگان
چکیده
منابع مشابه
Nuclear composition of gamma-ray burst fireballs
We study three processes that shape the nuclear composition of the fireballs in gamma-ray bursts (GRBs): (1) neutronization in the central engine, (2) nucleosynthesis in the fireball as it expands and cools, and (3) spallation of nuclei in subsequent internal shocks. The fireballs are shown to have a neutron excess and a marginally successful nucleosynthesis. They are composed of free nucleons,...
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A gamma-ray burst fireball is likely to contain an admixture of neutrons. Inelastic collisions between differentially streaming protons and neutrons in the fireball produce nu(&mgr;) (nu;(&mgr;)) of approximately 10 GeV as well as nu(e) (nu;(e)) of approximately 5 GeV, which could produce approximately 7 events/year in km(3) detectors, if the neutron abundance is comparable to that of protons. ...
متن کاملHigh Energy Neutrinos from Cosmological Gamma-Ray Burst Fireballs
Observations suggest that g-ray bursts (GRBs) are produced by the dissipation of the kinetic energy of a relativistic fireball. We show that a large fraction, $10%, of the fireball energy is expected to be converted by photomeson production to a burst of ,1014 eV neutrinos. A km2 neutrino detector would observe at least several tens of events per year correlated with GRBs, and test for neutrino...
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Temporal behaviour of GRB afterglow light curve is derived for the case where the electron energy distribution is relatively hard, with the power-law index p lying between 1.0 and 2.0. It is shown that the expected behaviour will be the same as that for p > 2.0 if the upper cutoff in the electron energy distribution evolves in direct proportion to the bulk Lorentz factor of the blast wave.
متن کاملCan a large neutron excess help solve the baryon loading problem in gamma-Ray burst fireballs?
We point out that the baryon loading problem in gamma-ray burst (GRB) models can be ameliorated if a significant fraction of the baryons which inertially confine the fireball is converted to neutrons. A high neutron fraction can result in a reduced transfer of energy from relativistic light particles in the fireball to baryons. The energy needed to produce the required relativistic flow in the ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2003
ISSN: 0074-1809
DOI: 10.1017/s0074180900194690