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Long gamma-ray bursts and core-collapse supernovae have different environments

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arxiv astro-ph/0603537 v2 pith:NNCGKHGV submitted 2006-03-20 astro-ph

A. S. Fruchter , A. J. Levan , L. Strolger , P. M. Vreeswijk , S. E. Thorsett , D. Bersier , I. Burud , J. M. Castro Cerón
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A. J. Castro-Tirado C. Conselice T. Dahlen H. C. Ferguson J. P. U. Fynbo P. M. Garnavich R. A. Gibbons J. Gorosabel T. R. Gull J. Hjorth S. T. Holland C. Kouveliotou Z. Levay M. Livio M. R. Metzger P. E. Nugent L. Petro E. Pian J. E. Rhoads A. G. Riess K. C. Sahu A. Smette N. R. Tanvir R. A. M. J. Wijers S. E. Woosley
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keywords gamma-rayburstscore-collapselongsupernovaegalaxiescollapseenvironments
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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 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 long gamma-ray bursts are far more concentrated on 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 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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Cited by 5 Pith papers

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