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Title:
Spatially Resolved Properties of the GRB 060505 Host: Implications for the Nature of the Progenitor
Authors:
Thöne, Christina C.; Fynbo, Johan P. U.; Östlin, Göran; Milvang-Jensen, Bo; Wiersema, Klaas; Malesani, Daniele; Della Monica Ferreira, Desiree; Gorosabel, Javier; Kann, D. Alexander; Watson, Darach; Michałowski, Michał J.; Fruchter, Andrew S.; Levan, Andrew J.; Hjorth, Jens; Sollerman, Jesper
Affiliation:
AA(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AB(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AC(Stockholm Observatory, Department of Astronomy, AlbaNova, SE-10691, Stockholm, Sweden.), AD(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AE(Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, Netherlands.), AF(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AG(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AH(Instituto de Astrofísica de Andalucía (IAA-CSIC), P.O. Box 3004, E-18080 Granada, Spain.), AI(Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany), AJ(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AK(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AL(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AM(Department of Physics, University of Warwick, Coventry CV4 7AL, UK.), AN(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark ), AO(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark; Stockholm Observatory, Department of Astronomy, AlbaNova, SE-10691, Stockholm, Sweden. )
Publication:
The Astrophysical Journal, Volume 676, Issue 2, pp. 1151-1161. (ApJ Homepage)
Publication Date:
04/2008
Origin:
UCP
Astronomy Keywords:
Galaxies: Abundances, Galaxies: ISM, Gamma Rays: Bursts
DOI:
10.1086/528943
Bibliographic Code:
2008ApJ...676.1151T

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~212 km s-1, corresponding to a mass of 1.14×1011 Msolar 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 Msolar 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.

Based on ESO-ToO proposal 077.D-0661 and ESO-LP proposal 177.A-0591.

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