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Long gamma-ray bursts and core-collapse supernovae have different environments.
A S Fruchter1, A J Levan, L Strolger
1Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA. fruchter@stsci.edu
Nature
|May 12, 2006
Summary
Long-duration gamma-ray bursts (GRBs) are not found in the same galactic regions as core-collapse supernovae. GRBs occur in brighter galaxy areas, suggesting they originate from extremely massive stars.
Area of Science:
- Astrophysics
- Stellar Evolution
- Cosmic Explosions
Background:
- Massive stars end their lives in core-collapse supernovae.
- Some core-collapse supernovae also produce long-duration gamma-ray bursts (GRBs).
- GRBs are exceptionally luminous relativistic explosions.
Purpose of the Study:
- To investigate the galactic environments of long-duration gamma-ray bursts (GRBs) and core-collapse supernovae.
- To test the assumption that GRBs and supernovae occur in similar stellar environments.
Main Methods:
- Comparative analysis of the host galaxy properties of GRBs and supernovae.
- Mapping the spatial distribution of GRBs and supernovae within their host galaxies.
Main Results:
- GRBs are significantly more concentrated in the brightest regions of their host galaxies compared to supernovae.
- Host galaxies of long-duration GRBs are fainter and more irregular than those of supernovae.
- These findings challenge the expectation of similar galactic environments for both phenomena.
Conclusions:
- Long-duration GRBs are associated with extremely massive stars.
- GRBs may be limited to galaxies with less chemical evolution.
- Long-duration GRBs are likely rare in galaxies like the Milky Way.
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