Delayed soft X-ray emission lines in the afterglow of GRB 030227

Details Delayed soft X-ray emission lines in the afterglow of GRB 030227 Delayed soft X-ray emission lines in the afterglow of GRB 030227

2003-06-13

arxiv.org/abs/astro-ph/0306284v2

Astrophys.J. 595 (2003) L29-L32

Astronomy and Astrophysics

Astrophysics

Submitted to ApJL. 14 pages, 3 figures with AASLaTeX

Scientific paper

10.1086/378790

Strong, delayed X-ray line emission is detected in the afterglow of GRB 030227, appearing near the end of the XMM-Newton observation, nearly twenty hours after the burst. The observed flux in the lines, not simply the equivalent width, sharply increases from an undetectable level (<1.7e-14 erg/cm^2/s, 3 sigma) to 4.1e-14 erg/cm^2/s in the final 9.7 ks. The line emission alone has nearly twice as many detected photons as any previous detection of X-ray lines. The lines correspond well to hydrogen and/or helium-like emission from Mg, Si, S, Ar and Ca at a redshift z=1.39. There is no evidence for Fe, Co or Ni--the ultimate iron abundance must be less than a tenth that of the lighter metals. If the supernova and GRB events are nearly simultaneous there must be continuing, sporadic power output after the GRB of a luminosity >~5e46 erg/s, exceeding all but the most powerful quasars.

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