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Astronomy and Astrophysics 535 (2011) A127
GRB091127/SN2009nz and the VLT/X-shooter spectroscopy of its host galaxy: probing the faint end of the mass-metallicity relation
S.D. Vergani1, 2, H. Flores1, S. Covino, D. Fugazza, J. Gorosabel, A. J. Levan, M. Puech1, R. Salvaterra, J. C. Tello, A. De Ugarte Postigo, P. D'Avanzo, V. D'Elia, M. Fernández, J.P.U. Fynbo, G. Ghirlanda, M. Jelínek, A. Lundgren, D. Malesani, E. Palazzi, S. Piranomonte, M. Rodrigues, R. Sánchez-Ramírez, V. Terrón, C.C. Thöne, L.A. Antonelli, S. Campana, A.J. Castro-Tirado, P. Goldoni2, 3, F. Hammer1, J. Hjorth, P. Jakobsson, L. Kaper, A. Melandri, B. Milvang-Jensen, J. Sollerman, G. Tagliaferri, N. R. Tanvir, K. Wiersema, R.A.M.J. Wijers
(2011)

We perform a detailed study of the gamma-ray burst GRB091127/SN2009nz host galaxy at z=0.490 using the VLT/X-shooter spectrograph in slit and integral-field unit (IFU). 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 SN2009nz 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 are in agreement 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_star). Our results extend to lower M_star values the M-Z plot derived for the sample of long GRB hosts at 0.3
1 :  GEPI - Galaxies, Etoiles, Physique, Instrumentation
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  SAp - Service d'Astrophysique
APC - AHE
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
gamma-ray burst – individual – GRB 091127 – supernovae – SN 2009nz – galaxies – ISM – evolution
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1107.3841