Characteristics of the Spectral Hardness Evolution in Gamma-ray Pulse
Using a theoretical model where the Doppler effect of the expanding fireball surface is the key factor concemed, we investigate the evolution of the observed peak energy Ep of the νfν spectrum and find that the Ep during the decay phase of the light curve pulse where the Doppler effect dominates, always monotonously decays following by the law of Ep χ t-l, regardless of whether rest-frame spectral hardness is softening or hardening, indicating that the Doppler effect conceals the information of the intrinsic spectrum. Investigation of 12 FRED pulses shows that the evolutionary characteristics of the Ep are in good agreement with our prediction.
cosmology observations gamma rays bursts gamma rays observations methods statistical
R.-J. Lu Z.-Y. Peng W. Dong
Physical qcience & Technology College,Guangxi University, Nanning, 530004, China Department oJ Physics, Yunnan Normal University, Kunming, 650092, China Physical qcience & Technology College, Guangxi University, Nanning, 530004, 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
241-243
2008-08-03（万方平台首次上网日期，不代表论文的发表时间）