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Title: CONSTRAINING THE LORENTZ FACTOR OF A RELATIVISTIC SOURCE FROM ITS THERMAL EMISSION

We propose a direct and simple method to measure the Lorentz factor of relativistically expanding objects such as gamma-ray bursts (GRBs). Only three measurements, i.e., the thermal component of the emission, the distance, and the variable timescale of the light curve, are used. When the uncertainties are considered, we will obtain a lower limit of the Lorentz factor instead. We apply this method to GRB 090618 and get a lower limit of 22 for the Lorentz factor. This method can be used for any relativistically moving objects, such as GRBs and soft gamma-ray repeaters.
Authors:
 [1] ; ;  [2]
  1. School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)
  2. Department of Physics, University of Hong Kong, Hong Kong (China)
Publication Date:
OSTI Identifier:
22518806
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 800; 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; COSMIC GAMMA BURSTS; COSMIC PHOTONS; DIAGRAMS; DISTANCE; GAMMA RADIATION; LORENTZ TRANSFORMATIONS; PHOTON EMISSION; RELATIVISTIC RANGE; VISIBLE RADIATION