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journal id: "astrophysicalxjournal"
| Authors||C.C. Thöne, J.P.U. Fynbo, G. Östlin, B. Milvang-Jensen, K. Wiersema, D. Malesani, D. Della Monica Ferreira, J. Gorosabel, D.A. Kann, D. Watson, M.J. Michałowski, A.S. Fruchter, A.J. Levan, J. Hjorth, J. Sollerman|
|Title||Spatially resolved properties of the GRB 060505 host: Implications for the nature of the progenitor|
|Faculty||Faculty of Science|
|Institute/dept.||FNWI: Astronomical Institute Anton Pannekoek (IAP)|
|Abstract||GRB 060505 was the first well-observed nearby possible long-duration gamma-ray burst ( GRB) that had no associated supernova. Here we present spatially resolved spectra of the host galaxy of GRB 060505, an Sbc spiral, at redshift z = 0.0889. The GRB occurred inside a star-forming region in the northern spiral arm at 6.5 kpc from the center. From the position of the emission lines, we determine a maximum rotational velocity for the galaxy of v similar to 212 km s(-1), corresponding to a mass of 1.14 x 10(11) M (circle dot) within 11 kpc from the center. By fitting single-age spectral synthesis models to the stellar continuum, we derive a very young age for the GRB site, confirmed by photometric and H alpha line measurements, of around similar to 6 Myr, which corresponds to the lifetime of a 32M(circle dot) star. The metallicity derived from several emission-line measurements varies throughout the galaxy and is lowest at the GRB site. Using the Two Degree Field Galaxy Redshift Survey we can locate the host galaxy in its large-scale (similar to Mpc) environment. The galaxy lies in the foreground of a filamentary overdensity, extending southwest from the galaxy cluster Abell 3837 at z = 0.0896. The properties of the GRB site are similar to those found for other long-duration GRB host galaxies with high specific star formation rate and low metallicity, which is an indication that GRB 060505 originated from a young, massive star that died without making a supernova.|
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