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The redshift dependence of long gamma-ray burst intrinsic properties

Astrophysics and Space Science volume 350, pages691–699(2014)Cite this article

Abstract

We performed a statistical analysis of the intrinsic properties and their redshift dependence of long gamma-ray bursts (GRBs) mainly detected by Swift satellite. The intrinsic quantities are the (z- and K-corrected) rest-frame duration, T 90,rest, the rest-frame peak energy, E p,rest, the isotropic equivalent energy, E iso, and the peak isotropic luminosity, L iso, of the prompt emission. We find that the distributions of T 90,rest, E p,rest, E iso and L iso all span a wide range and their central values are T 90,rest∼10 s, E p,rest∼500 keV, E iso∼1053 erg and L iso∼3×1052 erg/s. We also show that E p,rest and L iso are independent with T 90,rest, but E iso is correlated with T 90,rest. Moreover, we find the observed peak energy is independent with redshift, but the intrinsic peak energy, the isotropic energy and the peak luminosity all show some dependence on redshift, where the truncation effect is taken into account.

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Notes

  1. 1.

    http://www.mpe.mpg.de/~jcg/grbgen.html.

  2. 2.

    Since the number of short duration bursts that fulfill our selection criteria is very small (only two events is obtained), we only focus on long bursts in our analysis, especially in view of the rarity of genuine short bursts detected by Swift (Shao et al. 2011).

  3. 3.

    Recently, Bromberg et al. (2013) suggested that the commonly used limit of 2 s is conservative and the division ≶0.8 is more suitable for Swift.

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Acknowledgements

This work was supported in part by the National Basic Research Program of China (No. 2014CB845800 and No. 2013CB837000) and the National Natural Science Foundation of China (grants 11163003, U1331101, 11073057, 11103083 and 11273063). Y.-Z.F. is also supported by the 100 Talents program of the Chinese Academy of Sciences and by the Foundation for Distinguished Young Scholars of Jiangsu Province, China (No. BK2012047). F.-W.Z. also acknowledges the support by the China Postdoctoral Science Foundation funded project (No. 20110490139), the Guangxi Natural Science Foundation (No. 2013GXNSFAA019002), the Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects (OP201207) and the doctoral research foundation of Guilin University of Technology.

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Affiliations

  1. College of Science, Guilin University of Technology, Guilin, 541004, China
    • Fu-Wen Zhang
  2. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, China
    • Fu-Wen Zhang
    • , Yi-Zhong Fan
    •  & Da-Ming Wei
  3. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China
    • Fu-Wen Zhang
  4. Department of Space Science and Astronomy, Hebei Normal University, Shijiazhuang, 050024, China
    • Lang Shao
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Correspondence to Fu-Wen Zhang.

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Zhang, F., Shao, L., Fan, Y. et al. The redshift dependence of long gamma-ray burst intrinsic properties. Astrophys Space Sci 350, 691–699 (2014). https://doi.org/10.1007/s10509-014-1780-7

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Keywords

  • Gamma rays: general
  • Methods: data analysis
  • Methods: statistical