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

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dc.creatorWatson, D.
dc.creatorReeves, J. N.
dc.creatorHjorth, J.
dc.creatorJakobsson, P.
dc.creatorPedersen, K.
dc.date2003-06-13
dc.date2003-06-14
dc.date.accessioned2026-07-07T06:26:10Z
dc.date.available2026-07-07T06:26:10Z
dc.descriptionStrong, 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.
dc.descriptionSubmitted to ApJL. 14 pages, 3 figures with AASLaTeX
dc.identifierhttps://arxiv.org/abs/astro-ph/0306284
dc.identifierhttp://arxiv.org/abs/astro-ph/0306284
dc.identifierAstrophys.J. 595 (2003) L29-L32
dc.identifierdoi:10.1086/378790
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97030
dc.subjectAstrophysics
dc.titleDelayed soft X-ray emission lines in the afterglow of GRB 030227
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