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19 April 2024 |
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Article overview
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Non-Equilibrium Ionization States of GRB Environments | | D. Yonetoku
; T. Murakami
; K. Masai
; A. Yoshida
; N. Kawai
; M. Namiki
; | | Date: |
18 Jul 2001 | | Subject: | astro-ph | | Affiliation: | ISAS,TMU,Aoyama,TIT,RIKEN | | Abstract: | Iron spectral features are thought to be the best tracer of a progenitor of gamma-ray bursts (GRBs). The detections of spectral features such as an iron line and/or a Radiative Recombination edge and Continuum (RRC) were reported in four X-ray afterglows of GRBs. However their properties were different each other burst by burst. For example, Chandra observation of GRB 991216 reported both the strong H-like iron line together with its RRC. On the contrary, Yoshida et al. (2001) report only a detection of the strong RRC in GRB 970828 with ASCA. Since it is difficult to produce the strong RRC, we have to consider special condition for the line and/or the RRC forming region. In this paper, we point out a possibility of a ``non-equilibrium ionization state’’ for the line and the RRC forming region. | | Source: | arXiv, astro-ph/0107330 | | Services: | Forum | Review | PDF | Favorites | |
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