Very high column density and small reddening towards GRB 020124 at z = 3.20

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dc.creatorHjorth, J.
dc.creatorMøller, P.
dc.creatorGorosabel, J.
dc.creatorFynbo, J. P. U.
dc.creatorToft, S.
dc.creatorJaunsen, A. O.
dc.creatorKaas, A. A.
dc.creatorPursimo, T.
dc.creatorTorii, K.
dc.creatorKato, T.
dc.creatorYamaoka, H.
dc.creatorYoshida, A.
dc.creatorThomsen, B.
dc.creatorAndersen, M. I.
dc.creatorBurud, I.
dc.creatorCerón, J. M. Castro
dc.creatorCastro-Tirado, A. J.
dc.creatorFruchter, A. S.
dc.creatorKaper, L.
dc.creatorKouveliotou, C.
dc.creatorMasetti, N.
dc.creatorPalazzi, E.
dc.creatorPedersen, H.
dc.creatorPian, E.
dc.creatorRhoads, J.
dc.creatorRol, E.
dc.creatorTanvir, N. R.
dc.creatorVreeswijk, P. M.
dc.creatorWijers, R. A. M. J.
dc.creatorHeuvel, E. P. J. van den
dc.date2003-07-17
dc.date.accessioned2026-07-07T12:00:56Z
dc.date.available2026-07-07T12:00:56Z
dc.descriptionWe present optical and near-infrared observations of the dim afterglow of GRB 020124, obtained between 2 and 68 hours after the gamma-ray burst. The burst occurred in a very faint (R > 29.5) Damped Ly-alpha Absorber (DLA) at a redshift of z = 3.198 +- 0.004. The derived column density of neutral hydrogen is log(N_H) = 21.7 +- 0.2 and the rest-frame reddening is constrained to be E(B-V) < 0.065, i.e., A_V < 0.20 for standard extinction laws with R_V ~ 3. The resulting dust-to-gas ratio is less than 11 % of that found in the Milky Way, but consistent with the SMC and high-redshift QSO DLAs, indicating a low metallicity and/or a low dust-to-metals ratio in the burst environment. A grey extinction law (large R_V), produced through preferential destruction of small dust grains by the GRB, could increase the derived A_V and dust-to-gas ratio. The dimness of the afterglow is however fully accounted for by the high redshift: If GRB 020124 had been at z = 1 it would have been approximately 1.8 mag brighter--in the range of typical bright afterglows.
dc.description23 pages, 6 figures, ApJ, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0307331
dc.identifierhttp://arxiv.org/abs/astro-ph/0307331
dc.identifierAstrophys.J.597:699-705,2003
dc.identifierdoi:10.1086/378493
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206947
dc.subjectAstrophysics
dc.titleVery high column density and small reddening towards GRB 020124 at z = 3.20
dc.typetext

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