X-ray Lines in Gamma-ray Bursts and Cerenkov Line Mechanism

Details X-ray Lines in Gamma-ray Bursts and Cerenkov Line Mechanism X-ray Lines in Gamma-ray Bursts and Cerenkov Line Mechanism

2004-07-30

arxiv.org/abs/astro-ph/0407626v1

Astrophys.Space Sci. 297 (2005) 415

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures, 1 table, contribute to the Second Workshop on the Nature of the High-Energy UnidS for the publication in t

Scientific paper

10.1007/s10509-005-7701-z

X-ray emission and absorption features are of great importance in our understanding the nature and environment of gamma-ray bursts (GRBs). So far, iron emission lines have been detected in at least four GRB afterglows. In this paper, the observational properties and physical constraints on materials surrounding GRB sources are reviewed, and several classes of theoretical models are also discussed. We will specially concentrate on the Cerenkov line mechanism, in which the broad iron lines are expected, and a small mass of Fe is required to produce the large line luminosity. In addition, our interpretation can favor the recent jet unified model for different classes of gamma-ray bursts with a standard energy reservoir.

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