Swift GRB后glow光谱能谱
天体物理学
2010-11-11 v1
摘要
我们 presenting a program for系统性研究已知红移下Swift GRB后glow的光学至X射线光谱能谱 (SED) 的首次结果。旨在研究GRB爆炸及其介导吸收物质的性质。本报告中我们呈现对23个后glow的初步分析。得益于Swift,我们能够在GRB发生后(分钟至小时级)构建SED。我们从X射线光谱中推导出氢柱密度及光谱斜率。随后通过要求联合的光学/X射线SED源于同步辐射(即单一幂律或斜率变化为0.5的分段幂律),从而约束视紫外消光。我们确认粮粒比例偏低,甚至在此前可能更早获取的数据分析中也小于暗金属云团 (SMC)。我们的分析不支持“灰色”尘埃的存在。我们也发现,同步光谱在解释后glow SED方面表现出色。然而,我们清楚地看到,在X射线陡降相位及闪光期间,X射线辐射不能仅由后glow辐射解释。
引用
@article{arxiv.astro-ph/0701591,
title = {Swift GRBs: the early afterglow spectral energy distribution},
author = {G. Tagliaferri and D. Malesani and S. D. Vergani and S. Campana and G. Chincarini and S. Covino and C. Guidorzi and A. Moretti and P. Romano and L. A. Antonelli and M. Capalbi and M. L. Conciatore and G. Cusumano and P. Giommi and V. La Parola and V. Mangano and T. Mineo and M. Perri and E. Troja},
journal= {arXiv preprint arXiv:astro-ph/0701591},
year = {2010}
}
备注
To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9, 2006. To appear in Il Nuovo Cimento, 8 pages, 5 figures