Thöne, C. C., Fynbo, J. P. U., Ostlin, Goran, Milvang-Jensen, Bo, Wiersema, K., Malesani, Daniele, Ferreira, Desiree Della Monica, Gorosabel, J., Kann, D. Alexander, Watson, Darach, Michalowski, M. J., Fruchter, Andrew S., Levan, A. J., Hjorth, J. (Jens) and Sollerman, Jesper. (2008) Spatially resolved properties of the GRB 060505 host : Implications for the nature of the progenitor. Astrophysical Journal, Vol.676 (No.2). pp. 1151-1161. ISSN 0004-637X

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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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cosmic abundances, Interstellar matter, Gamma ray bursts, Galaxies -- Spectra
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	1 April 2008
Volume:	Vol.676
Number:	No.2
Number of Pages:	11
Page Range:	pp. 1151-1161
Identification Number:	10.1086/528943
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Instrumentcenter for Dansk Astrofysik [Instrument Centre for Danish Astrophsics] (IDA), Spain. Programa Nacional de Astronomıa y Astrofısica (AYA), ESP
Grant number:	639.043.302 (NWO), 2004-01515 (AYA), 2005-07714-C03-03 (ESP)
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URI:	http://wrap.warwick.ac.uk/id/eprint/30342

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