Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and Their Interpretation

Details Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and Their Interpretation Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and Their Interpretation

2011-09-17

arxiv.org/abs/1109.3757v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

8 pages, including 1 table and 2 figures, accepted for publication in ApJ

Scientific paper

The bulk Lorentz factor of the gamma-ray burst (GRB) ejecta (Gamma_0) is a key parameter to understand the GRB physics. Liang et al. have discovered a correlation between Gamma_0 and isotropic gamma-ray energy: Gamma_0\proptoE_{gamma,iso,52}^{0.25}. By including more GRBs with updated data and more methods to derive Gamma_0, we confirm this correlation and obtain Gamma_0~91E_{gamma,iso,52}^{0.29}. Evaluating the mean isotropic gamma-ray luminosities L_{gamma,iso} of the GRBs in the same sample, we discover an even tighter correlation Gamma_0~249 L_{gamma,iso,52}^{0.30}. 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 Gamma_0\proptoL_{gamma,iso}^{0.22}, which is well 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.

Affiliated with

Also associated with

No associations

Rating

Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and Their Interpretation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and Their Interpretation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and Their Interpretation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-142341