主要内容:
是个很暗的星系。
精彩摘抄:
文章信息:
- · arXiv e-print (arXiv:1107.3841)
- · References in the Article
- ·
- · Translate This Page
| Title: |
| GRB091127/SN2009nz 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.; de Ugarte Postigo, A.; D'Avanzo, P.; D'Elia, V.; Fernández, M.;Fynbo, J. P. U.; Jelínek, M.; Malesani, D.; Palazzi, E.; Piranomonte, S.; Rodrigues, M.; Sánchez-Ramírez, R.; Terrón, V.; Thöne, 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. |
| Publication: |
| eprint arXiv:1107.3841 |
| Publication Date: |
| 07/2011 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 9 pages, 6 figures, submitted to A&A |
| Bibliographic Code: |
| 2011arXiv1107.3841V |
Abstract
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 long-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 long-slit 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 values the M_star and metallicities (Z) derived for the sample of long GRB hosts at 0.3<z<1.0 and confirm the shift of the long GRB host M-Z relation from that found in the emission line galaxy surveys. Thanks to the IFU spectroscopy we can build the 2D velocity, velocity dispersion and star formation rate (SFR) maps. They show that the host galaxy has a perturbed rotation kinematics with evidence of a SFR enhancement consistent with the afterglow position.
没有评论:
发表评论