The warm, the excited, and the molecular gas: GRB 121024A shining through its star-forming galaxy
We present the first reported case of the simultaneous metallicity determination of a gamma-ray burst (GRB) host galaxy, from both afterglow absorption lines as well as strong emission-line diagnostics. Using spectroscopic and imaging observations of the afterglow and host of the long-duration Swift...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
27 May 2015
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2015, Jahrgang: 451, Heft: 1, Pages: 167-183 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stv960 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stv960
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| Verfasserangaben: | M. Friis, A. De Cia, T. Krühler, J.P.U. Fynbo, C. Ledoux, P.M. Vreeswijk, D.J. Watson, D. Malesani, J. Gorosabel, R.L.C. Starling, P. Jakobsson, K. Varela, K. Wiersema, A.P. Drachmann, A. Trotter, C.C. Thöne, A. de Ugarte Postigo, V. D'Elia, J. Elliott, M. Maturi, P. Goldoni, J. Greiner, J. Haislip, L. Kaper, F. Knust, A. LaCluyze, B. Milvang-Jensen, D. Reichart, S. Schulze, V. Sudilovsky, N. Tanvir and S.D. Vergani |
MARC
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| 520 | |a We present the first reported case of the simultaneous metallicity determination of a gamma-ray burst (GRB) host galaxy, from both afterglow absorption lines as well as strong emission-line diagnostics. Using spectroscopic and imaging observations of the afterglow and host of the long-duration Swift GRB 121024A at z = 2.30, we give one of the most complete views of a GRB host/environment to date. We observe a strong damped Lyα absorber (DLA) with a hydrogen column density of log $N({\rm H\,{\small I}})\,=\,21.88\pm 0.10$, H2 absorption in the Lyman-Werner bands (molecular fraction of log(f) ≈−1.4; fourth solid detection of molecular hydrogen in a GRB-DLA), the nebular emission lines Hα, Hβ, [O ii], [O iii] and [N ii], as well as metal absorption lines. We find a GRB host galaxy that is highly star forming (SFR ∼ 40 M⊙ yr−1), with a dust-corrected metallicity along the line of sight of [Zn/H]corr = −0.6 ± 0.2 ([O/H] ∼ −0.3 from emission lines), and a depletion factor [Zn/Fe] = 0.85 ± 0.04. The molecular gas is separated by 400 km s−1 (and 1-3 kpc) from the gas that is photoexcited by the GRB. This implies a fairly massive host, in agreement with the derived stellar mass of log(M★/M⊙) = $9.9^{+0.2}_{-0.3}$. We dissect the host galaxy by characterizing its molecular component, the excited gas, and the line-emitting star-forming regions. The extinction curve for the line of sight is found to be unusually flat (RV ∼ 15). We discuss the possibility of an anomalous grain size distributions. We furthermore discuss the different metallicity determinations from both absorption and emission lines, which gives consistent results for the line of sight to GRB 121024A. | ||
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