Very High Column Density and Small Reddening toward GRB 020124 at z=3.20 (Articolo in rivista)

Type
Label
  • Very High Column Density and Small Reddening toward GRB 020124 at z=3.20 (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Hjorth J., Moller P., Gorosabel J., Fynbo J.P.U., Toft S., Jaunsen A.O., Kaas A.A., Pursimo T., Torii K., Kato T., Yamaoka H., Yoshida A., Thomsen B., Andersen M.I., Burud I., Castro Ceron J.M., Castro-Tirado A.J., Fruchter A.S., Kaper L. et al (2003)
    Very High Column Density and Small Reddening toward GRB 020124 at z=3.20
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Hjorth J., Moller P., Gorosabel J., Fynbo J.P.U., Toft S., Jaunsen A.O., Kaas A.A., Pursimo T., Torii K., Kato T., Yamaoka H., Yoshida A., Thomsen B., Andersen M.I., Burud I., Castro Ceron J.M., Castro-Tirado A.J., Fruchter A.S., Kaper L. et al (literal)
Pagina inizio
  • 699 (literal)
Pagina fine
  • 705 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 597 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Very High Column Density and Small Reddening toward GRB 020124 at z=3.20 (literal)
Abstract
  • We present optical and near-infrared observations of the dim afterglow of GRB 020124, obtained between 2 and 68 hr 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 logN_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-metal ratio in the burst environment. A gray extinction law (large R_V), produced through preferential destruction of small dust grains by the gamma-ray burst, 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. (literal)
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