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The host of GRB 030323 at z=3.372: a very high column density DLA system with a low metallicity | | P. M. Vreeswijk
; S. L. Ellison
; C. Ledoux
; R. A. M. J. Wijers
; J. P. U. Fynbo
; P. M{o}ller
; A. Henden
; J. Hjorth
; G. Masi
; E. Rol
; B. L. Jensen
; N. Tanvir
; A. Levan
; J. M. Castro Cerón
; J. Gorosabel
; A. J. Castro-Tirado
; A. S. Fruchter
; C. Kouveliotou
; I. Burud
; J. Rhoads
; N. Masetti
; E. Palazzi
; E. Pian
; H. Pedersen
; L. Kaper
; A. Gilmore
; P. Kilmartin
; J. V. Buckle
; M. S. Seigar
; D. H. Hartmann
; K. Lindsay
; E. P. J. van den Heuvel
; | | Date: |
3 Mar 2004 | | Journal: | Astron.Astrophys. 419 (2004) 927-940 DOI: 10.1051/0004-6361:20040086 | | Subject: | astro-ph | | Abstract: | We present photometry and spectroscopy of the afterglow of GRB 030323. VLT spectra of the afterglow show damped Lya (DLA) absorption and low- and high-ionization lines at a redshift z=3.3718+-0.0005. The inferred neutral hydrogen column density, log N(HI)=21.90+-0.07, is larger than any (GRB- or QSO-) DLA HI column density inferred directly from Lya in absorption. From the afterglow photometry, we derive a conservative upper limit to the host-galaxy extinction: A(V)<0.5 mag. The iron abundance is [Fe/H]=-1.47+-0.11, while the metallicity of the gas as measured from sulphur is [S/H]=-1.26+-0.20. We derive an upper limit on the H2 molecular fraction of 2N(H2)/(2N(H2)+N(HI))<~10^-6. In the Lya trough, a Lya emission line is detected, which corresponds to a star-formation rate (not corrected for dust extinction) of roughly 1 Msun per year. All these results are consistent with the host galaxy of GRB 030323 consisting of a low metallicity gas with a low dust content. We detect fine-structure lines of silicon, SiII*, which have never been clearly detected in QSO-DLAs; this suggests that these lines are produced in the vicinity of the GRB explosion site. Under the assumption that these fine-structure levels are populated by particle collisions, we estimate the HI volume density to be n_HI=100-10000 cm^-3. HST/ACS imaging 4 months after the burst shows an extended AB(F606W)=28.0+-0.3 mag object at a distance of 0.14" (1kpc) from the early afterglow location, which presumably is the host galaxy of GRB 030323. | | Source: | arXiv, astro-ph/0403080 | | Services: | Forum | Review | PDF | Favorites | |
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