SIMBAD references

2012ApJ...751...49L - Astrophys. J., 751, 49 (2012/May-3)

Lorentz-factor–isotropic-luminosity/energy correlations of gamma-ray bursts and their interpretation.

LU J., ZOU Y.-C., LEI W.-H., ZHANG B., WU Q., WANG D.-X., LIANG E.-W. and LU H.-J.

Abstract (from CDS):

The bulk Lorentz factor of the gamma-ray burst (GRB) ejecta (Γ0) is a key parameter to understanding GRB physics. Liang et al. have discovered a correlation between Γ0 and isotropic γ-ray energy: Γ0∝E 0.25_γ, iso, 52_. By including more GRBs with updated data and more methods to derive Γ0, we confirm this correlation and obtain Γ0 ≃ 91E 0.29_γ, iso, 52_. Evaluating the mean isotropic γ-ray luminosities L_γ, iso_ of the GRBs in the same sample, we discover an even tighter correlation Γ0≃ 249L 0.30_γ, iso, 52_. We propose an interpretation to this later correlation. Invoking a neutrino-cooled hyperaccretion disk around a stellar mass black hole as the central engine of GRBs, we derive jet luminosity powered by neutrino annihilation and baryon loading from a neutrino-driven wind. Applying beaming correction, we finally derive Γ0∝L 0.22_γ, iso_, which is consistent with the data. This suggests that the central engine of long GRBs is likely a stellar mass black hole surrounded by a hyper-accreting disk.

Abstract Copyright:

Journal keyword(s): black hole physics - gamma-ray burst: general - neutrinos - relativistic processes

Simbad objects: 51

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