Unusual sites of GRBs in their host galaxies Lise Christensen

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Presentation transcript:

Unusual sites of GRBs in their host galaxies Lise Christensen ESO, Chile Work done with: Paul Vreeswijk Jesper Sollerman Christina Thoene Klaas Wiersema Emeric Le Floc’h HST images of Typical hosts of long duration bursts at z~1 (Fruchter et al 2006)

Host of GRB 980425 - SN 1998 bw (z=0.0085) FORS BVR VIMOS cube 30” = 5 kpc SN region Compare with archive data: Magnitudes and Colours have to match Broad band data Extracted narrow band IFU image has to match narrow band images IFU extracted spectra have to match Long slit spectra

Location of the GRB from HST/STIS WR region SN region

Derived properties: Ha emission line fit - > velocity map -> dynamic mass Ha flux -> SFR, Specific SFR <- 24 m Spitzer image Ha flux / continuum -> Ha EW -> age Ha/Hb -> reddening E(B-V) Flux ratios [OIII]/Hb / [NII]/HaOxygen abundance Each spectrum > stellar population fitting -> stellar mass,age 12+log(O/H) Christensen et al 2008

unusual emission line ratios? Dopita et al. 2006