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Title: GRB 091127/SN 2009nz and the VLT/X-shooter spectroscopy of its host galaxy: probing the faint end of the mass-metallicity relation
Authors: Vergani, S. D.
Flores, H.
Covino, S.
Fugazza, D.
Gorosabel, J.
Levan, A. J.
Puech, M.
Salvaterra, R.
Tello, J. C.
Postigo, A. D. U.
D'Avanzo, P.
D'Elia, V.
Fernandez, M.
Fynbo, J. P. U.
Ghirlanda, G.
Jelinek, M.
Lundgren, A.
Malesani, D.
Palazzi, E.
Piranomonte, S.
Rodrigues, M.
Sanchez-Ramirez, R.
Terron, V.
Thoene, C. C.
Antonelli, L. A.
Campana, S.
Castro-Tirado, A. J.
Goldoni, P.
Hammer, F.
Hjorth, J.
Jakobsson, P.
Kaper, L.
Melandri, A.
Milvang-Jensen, B.
Sollerman, J.
Tagliaferri, G.
Tanvir, N. R.
Wiersema, K.
Wijers, R. A. M. J.
First Published: 30-Nov-2011
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2011, 535
Abstract: We perform a detailed study of the gamma-ray burst GRB 091127/SN 2009nz host galaxy at z = 0.490 using the VLT/X-shooter spectrograph in slit and integral-field unit (IFU) mode. From the analysis of the optical and X-ray afterglow data obtained from ground-based telescopes and Swift-XRT, we confirm the presence of a bump associated with SN 2009nz and find evidence of a possible jet break in the afterglow lightcurve. The X-shooter afterglow spectra reveal several emission lines from the underlying host, from which we derive its integrated properties. These properties agree with those of previously studied GRB-SN hosts and, more generally, with those of the long GRB host population. We use the Hubble Space Telescope and ground-based images of the host to determine its stellar mass (M⋆). Our results extend to lower M⋆ values the M-Z plot derived for the sample of long GRB hosts at 0.3 < z < 1.0 adding new information to probe the faint end of the M-Z relation and the shift of the LGRB host M-Z relation from that found from emission-line galaxy surveys. Thanks to the IFU spectroscopy, we can build the two-dimensional (2D) velocity, velocity dispersion, and star formation rate (SFR) maps. They show that the host galaxy has perturbed rotation kinematics with evidence of a SFR enhancement consistent with the afterglow position.
DOI Link: 10.1051/0004-6361/201117726
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2011 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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