A Possible Emission Feature in an X-ray Afterglow of GRB970828 as a Radiative Recombination Edge

Details A Possible Emission Feature in an X-ray Afterglow of GRB970828 as a Radiative Recombination Edge A Possible Emission Feature in an X-ray Afterglow of GRB970828 as a Radiative Recombination Edge

2001-07-18

arxiv.org/abs/astro-ph/0107331v1

Astronomy and Astrophysics

Astrophysics

To appear in the Astrophysical Journal Letters, 13 pages including 2 figures.(Companion paper: Yonetoku et al. (2001))

Scientific paper

10.1086/323143

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.

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