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Title: What Can We Learn about GRB from the Variability Timescale Related Correlations?

Abstract

Recently, two empirical correlations related to the minimum variability timescale (MTS) of the light curves are discovered in gamma-ray bursts (GRBs). One is the anti-correlation between MTS and Lorentz factor Γ, and the other is the anti-correlation between the MTS and gamma-ray luminosity L {sub γ}. Both of the two correlations might be used to explore the activity of the central engine of GRBs. In this paper, we try to understand these empirical correlations by combining two popular black hole central engine models (namely, the Blandford and Znajek mechanism (BZ) and the neutrino-dominated accretion flow (NDAF)). By taking the MTS as the timescale of viscous instability of the NDAF, we find that these correlations favor the scenario in which the jet is driven by the BZ mechanism.

Authors:
; ;  [1]
  1. School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)
Publication Date:
OSTI Identifier:
22661185
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 838; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; BLACK HOLES; CORRELATIONS; COSMIC GAMMA BURSTS; GAMMA RADIATION; INSTABILITY; LUMINOSITY; MAGNETIC FIELDS; NEUTRINOS; STARS; VISIBLE RADIATION

Citation Formats

Xie, Wei, Lei, Wei-Hua, and Wang, Ding-Xiong, E-mail: leiwh@hust.edu.cn. What Can We Learn about GRB from the Variability Timescale Related Correlations?. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6718.
Xie, Wei, Lei, Wei-Hua, & Wang, Ding-Xiong, E-mail: leiwh@hust.edu.cn. What Can We Learn about GRB from the Variability Timescale Related Correlations?. United States. doi:10.3847/1538-4357/AA6718.
Xie, Wei, Lei, Wei-Hua, and Wang, Ding-Xiong, E-mail: leiwh@hust.edu.cn. Sat . "What Can We Learn about GRB from the Variability Timescale Related Correlations?". United States. doi:10.3847/1538-4357/AA6718.
@article{osti_22661185,
title = {What Can We Learn about GRB from the Variability Timescale Related Correlations?},
author = {Xie, Wei and Lei, Wei-Hua and Wang, Ding-Xiong, E-mail: leiwh@hust.edu.cn},
abstractNote = {Recently, two empirical correlations related to the minimum variability timescale (MTS) of the light curves are discovered in gamma-ray bursts (GRBs). One is the anti-correlation between MTS and Lorentz factor Γ, and the other is the anti-correlation between the MTS and gamma-ray luminosity L {sub γ}. Both of the two correlations might be used to explore the activity of the central engine of GRBs. In this paper, we try to understand these empirical correlations by combining two popular black hole central engine models (namely, the Blandford and Znajek mechanism (BZ) and the neutrino-dominated accretion flow (NDAF)). By taking the MTS as the timescale of viscous instability of the NDAF, we find that these correlations favor the scenario in which the jet is driven by the BZ mechanism.},
doi = {10.3847/1538-4357/AA6718},
journal = {Astrophysical Journal},
number = 2,
volume = 838,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}