Reconsidering the origin of the X-ray emission lines in GRB 011211

Details Reconsidering the origin of the X-ray emission lines in GRB 011211 Reconsidering the origin of the X-ray emission lines in GRB 011211

2003-05-15

arxiv.org/abs/astro-ph/0305265v2

Astron.Astrophys. 415 (2004) 443-450

Astronomy and Astrophysics

Astrophysics

revised version accepted for publication by A&A

Scientific paper

10.1051/0004-6361:20034626

We reanalyze the XMM--Newton data of GRB 011211 showing that the spectral features, interpreted by Reeves et al. (2002, 2003) as due thermal emission from a collisionally ionized plasma, can be also reproduced by a reflection model (with ionization parameter $\xi\sim 10^2$). We discuss the implications of this interpretation, estimating the total mass required in the simplified case of a funnel geometry. We conclude that a moderate clumping of the reprocessing material (corresponding to a filling factor of the order of $f\sim 10^{-3}$) is required. Finally we show that, if this interpretation is correct, a bright quasi--thermal component is expected in the optical--UV band (containing about 90% of the luminosity of the illuminating continuum), whose presence can be used to test the reflection model.

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