Fine - Structure Fe II and Si II Absorption in the Spectrum of GRB 051111 : Implications for the Burst Environment

Abstract

We present an analysis of fine-structure transitions of Fe II and Si II detected in a high-resolution optical spectrum of the afterglow of GRB 051111 (z = 1.54948). The fine-structure absorption features arising from Fe II* to Fe II****, as well as Si II*, are confined to a narrow velocity structure extending over ±30 km s −1 , which we interpret as the… (More)

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@inproceedings{Berger2008FineS, title={Fine - Structure Fe II and Si II Absorption in the Spectrum of GRB 051111 : Implications for the Burst Environment}, author={E. Berger and Bryan E. Penprase and Deborah Fox and S R Kulkarni and G. Hill and B. Sch{\"a}fer and Michael Douglas Reed}, year={2008} }