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16 April 2024 |
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A Possible Emission Feature in an X-ray Afterglow of GRB970828 as a Radiative Recombination Edge | | A.Yoshida
; M.Namiki
; D.Yonetoku
; T.Murakami
; C.Otani
; N.Kawai
; Y.Ueda
; R.Shibata
; S.Uno
; | | Date: |
18 Jul 2001 | | Subject: | astro-ph | | Affiliation: | 1 and 2), M.Namiki , D.Yonetoku (3 and 4), T.Murakami , C.Otani , N.Kawai (1 and 4), Y.Ueda , R.Shibata , S.Uno ( RIKEN, Aoyama Gakuin University, ISAS, Tokyo Institute of Technology, Nihon Fukushi University | | Abstract: | A gamma-ray burst of 28 August 1997 was localized by the All-Sky Monitor on the Rossi XTE satellite and its coordinates were promptly disseminated. An ASCA followup started 1.17 days after the burst as a Target of Opportunity Observation and detected an X-ray afterglow. The spectral data displayed a hump around ~5 keV and an absorption column of 7.1 x 10^21 cm^{-2}. This hump structure is likely a recombination edge of iron in the vicinity of the source, taking account of the redshift z = 0.9578 found for the likely host galaxy of the associated radio flare. Radiative Recombination edge and Continuum model can interpret the spectrum from highly ionized plasma in a non equilibrium ionization state. The absorption could be also due to the medium presumably in the vicinity of the GRB. | | Source: | arXiv, astro-ph/0107331 | | Services: | Forum | Review | PDF | Favorites | |
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