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Title: COSMOLOGICAL TIME DILATION IN DURATIONS OF SWIFT LONG GAMMA-RAY BURSTS

Cosmological time dilation is a fundamental phenomenon in an expanding universe, which stresses that both the duration and wavelength of the emitted light from a distant object at the redshift z will be dilated by a factor of 1 + z at the observer. By using a sample of 139 Swift long gamma-ray bursts with known redshift (z ≤ 8.2), we measure the observed duration (T {sub 90}) in the observed energy range between 140/(1 + z) keV and 350/(1 + z) keV, corresponding to a fixed energy range of 140-350 keV in the rest frame. We obtain a significant correlation between the duration and the factor 1 + z, i.e., T {sub 90} = 10.5(1 + z){sup 0.94} {sup ±} {sup 0.26}, which is consistent with that expected from the cosmological time dilation effect.
Authors:
; ;  [1] ;  [2]
  1. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain ObservatoryChinese Academy of Sciences, Nanjing 210008 (China)
  2. Department of Space Science and AstronomyHebei Normal University, Shijiazhuang 050024 (China)
Publication Date:
OSTI Identifier:
22364131
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 778; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CORRELATIONS; COSMIC GAMMA BURSTS; COSMOLOGY; DATA ANALYSIS; KEV RANGE; PHOTON EMISSION; RED SHIFT; STRESSES; UNIVERSE; VISIBLE RADIATION