A Possible Emission Feature in an X-Ray Afterglow of GRB 970828 as a Radiative Recombination Edge | Zendy

A. Yoshida | Zendy; M. Namiki | Zendy; Daisuke Yonetoku | Zendy; T. Murakami | Zendy; Chiko Otani | Zendy; N. Kawai | Zendy; Yoshihiro Ueda | Zendy; R. Shibata | Zendy; S. Uno | Zendy

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A Possible Emission Feature in an X-Ray Afterglow of GRB 970828 as a Radiative Recombination Edge

Author(s) -

A. Yoshida,

M. Namiki,

Daisuke Yonetoku,

T. Murakami,

Chiko Otani,

N. Kawai,

Yoshihiro Ueda,

R. Shibata,

S. Uno

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323143

Subject(s) - afterglow , astrophysics , physics , gamma ray burst , redshift , galaxy , ionization , radiative transfer , recombination , absorption (acoustics) , absorption edge , astronomy , ion , chemistry , optics , quantum mechanics , biochemistry , band gap , gene

A gamma-ray burst of 28 August 1997 was localized by the All-Sky Monitor onthe Rossi XTE satellite and its coordinates were promptly disseminated. An ASCAfollowup started 1.17 days after the burst as a Target of OpportunityObservation and detected an X-ray afterglow. The spectral data displayed a humparound ~5 keV and an absorption column of 7.1 x 10^21 cm^{-2}. This humpstructure 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 ofthe associated radio flare. Radiative Recombination edge and Continuum modelcan interpret the spectrum from highly ionized plasma in a non equilibriumionization state. The absorption could be also due to the medium presumably inthe vicinity of the GRB.Comment: To appear in the Astrophysical Journal Letters, 13 pages including 2 figures.(Companion paper: Yonetoku et al. (2001)

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