Energetics and beaming of gamma ray burst triggers
نویسندگان
چکیده
منابع مشابه
Energetics and Beaming of Gamma Ray Burst Triggers
A wide range of mechanisms have been proposed to supply the energy for gamma-ray bursts (GRB) at cosmological distances. It is a common misconception that some of these, notably NS-NS mergers, cannot meet the energy requirements suggested by recent observations. We show here that GRB energies, even at the most distant redshifts detected, are compatible with current binary merger or collapse sce...
متن کاملGamma-ray Burst Energetics
We estimate the fraction of the total energy in a Gamma-Ray Burst (GRB) that is radiated in photons during the main burst. Random internal collisions among different shells limit the efficiency for converting bulk kinetic energy to photons. About 6% of the energy of explosion is converted to radiation for long duration bursts (lasting 10s or more); the efficiency is significantly smaller for sh...
متن کامل/ 98 08 10 6 v 2 4 S ep 1 99 8 Energetics and Beaming of Gamma Ray Burst Triggers
A wide range of mechanisms have been proposed to supply the energy for gamma-ray bursts (GRB) at cosmological distances. It is a common misconception that some of these, notably NS-NS mergers, cannot meet the energy requirements suggested by recent observations. We show here that GRB energies, even at the most distant redshifts detected, are compatible with current binary merger or collapse sce...
متن کاملAfterglows as Diagnostics of Gamma Ray Burst Beaming
If gamma ray bursts are highly collimated, radiating into only a small fraction of the sky, the energy requirements of each event may be reduced by several (up to 4–6) orders of magnitude, and the event rate increased correspondingly. The large Lorentz factors (Γ ∼ 100) inferred from GRB spectra imply relativistic beaming of the gamma rays into an angle ∼ 1/Γ. We are at present ignorant of whet...
متن کاملGamma Ray Burst Beaming Constraints from Afterglow Light Curves
The beaming angle ζm is the main uncertainty in gamma ray burst energy requirements today. We summarize predictions for the light curves of beamed bursts, and model the R band light curve of GRB 970508 to derive ζm >∼ 30 ◦ . This yields an irreducible minimum energy requirement of 3.4×10 ergs to power the afterglow alone. 1. Beamed Gamma Ray Burst Afterglow Models In the Rome meeting I presente...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: New Astronomy
سال: 1999
ISSN: 1384-1076
DOI: 10.1016/s1384-1076(99)00013-5