• Lan-Wei Jia

      Articles written in Journal of Astrophysics and Astronomy

    • Is GRB 100418A a Cosmic Twin of GRB 060614?

      Lan-Wei Jia Hou-Jun Lü Shu-Jin Hou En-Wei Liang

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      GRB 100418A is a long burst at 𝑧 = 0.624 without detection of associated supernova (SN).We present a detailed analysis on this event and discuss possible origins of its multi-wavelength emission. The temporal features of this event is similar to GRB 060614, a well-known nearby long GRB without SN association (possibly a Type I GRB), indicating that the two events may be cosmic twins. However, both the circumburst medium density and the GRB classification based on the gamma-ray energy and spectrum suggest that GRB 100418A would be a Type II GRB. These results make a great puzzle on the progenitors of this kind of events, if they belong to the same population.

    • Statistical Properties of Gamma-Ray Burst Host Galaxies

      Jie-Min Chen Jin Zhang Lan-Wei Jia En-Wei Liang

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      A statistical analysis of gamma-ray burst host galaxies is presented and a clear metallicity-stellar mass relation is found in our sample. A trend that a more massive host galaxy tends to have a higher star-formation rate is also found. No correlation is found between 𝐴V and 𝑁H. GRB host galaxies at a higher redshift also tend to have a higher star formation rate, however, even in the same redshift, the star formation rate may vary for three orders of magnitude.

    • Spectral Lag Evolution among 𝛾-Ray Burst Pulses

      Lan-Wei Jia Yun-Feng Liang En-Wei Liang

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      We analyse the spectral lag evolution of 𝛾-ray burst (GRB) pulses with observations by CGRO/BATSE. No universal spectral lag evolution feature and pulse luminosity-lag relation within a GRB is observed.Our results suggest that the spectral lag would be due to radiation physics and dynamics of a given emission episode, possibly due to the longer lasting emission in a lower energy band, and the spectral lag may not be an intrinsic parameter to discriminate the long and short GRBs.

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      Posted on January 27, 2016

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