The host of GRB 030323 at z=3.372: A very high column density DLA system with a low metallicity

  title={The host of GRB 030323 at z=3.372: A very high column density DLA system with a low metallicity},
  author={Paul M. Vreeswijk and Sara L. Ellison and C{\'e}dric Ledoux and Ralph Wijers and Johan P. U. Fynbo and Palle M{\o}ller and Arne Anthon Henden and Jens Hjorth and Gianluca de Masi and Evert Rol and Brian L. Jensen and Nial R. Tanvir and Andrew J. Levan and Jos'e Mar'ia Castro Cer'on and Javier Gorosabel and Alberto J. Castro-Tirado and Andrew S. Fruchter and Chryssa Kouveliotou and Ingunn Burud and James E. Rhoads and Nicola Masetti and Eliana Palazzi and Elena Pian and Holger Pedersen and Lex Kaper and Alan C. Gilmore and Pam M. Kilmartin and Jane V. Buckle and Marc S. Seigar and Dieter H. Hartmann and Kevin Lindsay and Edward van den Heuvel},
  journal={Astronomy and Astrophysics},
We present photometry and spectroscopy of the afterglow of GRB 030323. VLT spectra of the afterglow show damped Lyα (DLA) absorption and low- and high-ionization lines at a redshift z = 3.3718 ± 0.0005. The inferred neutral hy- drogen column density, log N(Hi) = 21.90 ± 0.07, is larger than any (GRB- or QSO-) DLA H  column density inferred directly from Lyα in absorption. From the afterglow photometry, we derive a conservative upper limit to the host-galaxy extinction: AV < 0.5 mag. The iron… 

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