Astrophys. J., 676, 1151-1161 (2008/April-1)
Spatially resolved properties of the GRB 060505 host: implications for the nature of the progenitor.
THONE C.C., FYNBO J.P.U., OSTLIN G., MILVANG-JENSEN B., WIERSEMA K., MALESANI D., DELLA MONICA FERREIRA D., GOROSABEL J., KANN D.A., WATSON D., MICHALOWSKI M.J., FRUCHTER A.S., LEVAN A.J., HJORTH J. and SOLLERMAN J.
Abstract (from CDS):
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∼212 km/s, corresponding to a mass of 1.14x1011 M☉ 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 Hα line measurements, of around ∼6 Myr, which corresponds to the lifetime of a 32 M☉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 (∼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.
Galaxies: Abundances - Galaxies: ISM - Gamma Rays: Bursts
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