Fruchter, A.S; Levan, A.J; Strolger, L; Vreeswijk, P.M; Thorsett, S.E; Bersier, D; Burud, I; Ceron, J.M.C; Castro-Tirado, A.J; Conselice, C; Dahlen, T; Ferguson, H.C; Fynbo, J.P.U; Garnavich, P.M; Gibbons, R.A; Gorosabel, J; Gull, T.R; Hjorth, J; Holland, S.T; Kouveliotou, C; Levay, Z; Livio, M; Metzger, M.R; Nugent, P.E; Petro, L; Pian, E; Rhoads, J.E; Riess, A.G; Sahu, K.C; Smette, A; Tanvir, N.R; Wijers, R; Woosley, S.E
Long gamma-ray bursts and core-collapse supernovae have different environments
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  • Nature (London), 2006, Vol.441 (7092), p.463-468
Ort / Verlag
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When massive stars exhaust their fuel, they collapse and often produce the extraordinarily bright explosions known as core-collapse supernovae. On occasion, this stellar collapse also powers an even more brilliant relativistic explosion known as a long-duration gamma-ray burst. One would then expect that these long gamma-ray bursts and core-collapse supernovae should be found in similar galactic environments. Here we show that this expectation is wrong. We find that the gamma-ray bursts are far more concentrated in the very brightest regions of their host galaxies than are the core-collapse supernovae. Furthermore, the host galaxies of the long gamma-ray bursts are significantly fainter and more irregular than the hosts of the core-collapse supernovae. Together these results suggest that long-duration gamma-ray bursts are associated with the most extremely massive stars and may be restricted to galaxies of limited chemical evolution. Our results directly imply that long gamma-ray bursts are relatively rare in galaxies such as our own Milky Way.

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