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Comparison between the time-integrated spectrum and the peak time spectrum of gamma-ray bursts and possible implications

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Abstract

The mono-frequency peak luminosity and the corresponding photon energy of the time-integrated (L sp , E sp ) and peak time (L tp , E tp ) νf ν spectra were derived for a sample of 38 redshift-known Fermi GRBs by fitting the spectra with the Band function. It was found that E tp is generally consistent with E sp , and L tp is averagely three times larger than L sp . The slope of the L tp –E tp relation was consistent with that of the L sp –E sp relation. The photon indices in the peak time spectrum, particularly, the index of the low energy end was, were statistically larger than that in the time-integrated spectrum. These results indicate that L sp and E sp are dominated by L tp and E tp , respectively. The difference of the spectral indices between the time-integrated and peak time spectra may be because of the overlap effect of a series of time-resolved spectra within a GRB. Our simulations, which were based on the observed spectral evolution and correlation between the energy flux and the peak energy within individual GRBs support our speculations. The L tp –E tp relation may be less contaminated by the overlap effect, and it would may be an intrinsic feature of radiation physics.

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Authors and Affiliations

  1. Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning, 530004, China

    Fen Lyu, YuanZhu Wang, YunFeng Liang, TingTing Lin, YouDong Hu & EnWei Liang

  2. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, China

    Fen Lyu & YunFeng Liang

  3. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China

    Fen Lyu & EnWei Liang

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  1. Fen Lyu
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Correspondence to EnWei Liang.

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Lyu, F., Wang, Y., Liang, Y. et al. Comparison between the time-integrated spectrum and the peak time spectrum of gamma-ray bursts and possible implications. Sci. China Phys. Mech. Astron. 58, 1–8 (2015). https://doi.org/10.1007/s11433-014-5575-1

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