The Robust Link between Spectral Evolution and Spectral Lag of Gamma-ray Bursts
We have investigated the connection between the various evolution of rest frame spectral pararaeters and the spectral lag measured in gamma-ray bursts (GRBs) using a Doppler model of fireball. Assuming an intrinsic Band shape spectrum and an intrinsic energy-independent emission profile we find the evolution of Band spectral parameters alone can produce the observed lags. Moreover, hard-to-soft evolution produce the positive lag. Whereas the negative lags occur in the case of spectral parameters change from soft to hard. The less popular soft-to-hard-to-soft evolution also produce both the observed positive and negative lags. A sample including 30 8ingle pulses whose spectral evolution follow hardto-soft and soft-hard-to-soft have been investigated. The lags of these pulses are in good agreement with our theoretical predictions.
gamma rays bursts - gamma rays theory - relativity
Z. Y. Peng L. Ma Y. Y. Bao Y. Yin
Department of Physics, Yunnan Normal University, Kunming 650092, China Department of Plyisics, Yuxi Normal College, Yuxi 653100, China
国际会议
The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)
昆明
英文
63-64
2008-08-03（万方平台首次上网日期，不代表论文的发表时间）