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arxiv 1907.08806 v2 pith:G4L5VYGD submitted 2019-07-20 astro-ph.HE

Spectral Lag for a Radiating Jet Shell with a High Energy Cut-off Radiation Spectrum

Shen-Shi Du , Da-Bin Lin , Rui-Jing Lu , Rui-Quan Li , Ying-Ying Gan , Jia Ren , Xiang-Gao Wang , En-Wei Liang This is my paper
classification astro-ph.HE
keywords spectralshellcut-offspectrumenergylagsbandcutevolution
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Recent research shows that the spectral lag is closely related to the spectral evolution in GRBs. In this paper, we study the spectral lag for a radiating jet shell with a high-energy cut-off radiation spectrum. For the jet shell with a cut-off power-law spectrum, the spectral lag monotonically increases with the photon energy and levels off at a certain photon energy. It is the same for the jet shell with a Band cut-off spectrum (Bandcut). However, a turn-over from the positive lags to negative lags appears in the high-energy range for the jet shell with Bandcut, which is very similar to that observed in GRB~160625B. The dependence of the spectral lags on the spectral shape/evolution are studied in details. In addition, the spectral lag behavior observed in GRB~160625B is naturally reproduced based on our theoretical outcome.

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