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Particle acceleration on megaparsec scales in a merging galaxy cluster
Reinout J van Weeren1, Huub J A Röttgering, Marcus Brüggen
1Leiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA Leiden, Netherlands. rvweeren@strw.leidenuniv.nl
Science (New York, N.Y.)
|October 9, 2010
Summary
Astronomers detected a radio relic in a galaxy cluster merger, revealing insights into cosmic ray acceleration. This finding demonstrates that shock waves in galaxy clusters can generate highly energetic cosmic rays, similar to supernova remnants but on a larger scale.
Area of Science:
- Cosmic Microwave Background
- Astrophysics
- Particle Physics
Background:
- Galaxy clusters form via mergers of smaller structures.
- Diffusive shock acceleration models predict particle acceleration in cluster merger shocks.
- These accelerated particles can emit synchrotron radiation, forming radio relics.
Purpose of the Study:
- To detect and characterize a radio relic in a galaxy cluster merger.
- To investigate the properties of magnetic fields and particle acceleration at these large scales.
- To compare particle acceleration mechanisms in galaxy clusters with those in supernova remnants.
Main Methods:
- Radio astronomy observations were used to detect the radio relic.
- Analysis of the relic's properties, including magnetic field alignment, spectral index gradient, and width.
Main Results:
- A radio relic with highly aligned magnetic fields was detected.
- A strong spectral index gradient and narrow relic width were observed.
- Evidence for diffusive shock acceleration operating on large scales was found.
Conclusions:
- Galaxy cluster shocks are capable of producing extremely energetic cosmic rays.
- Diffusive shock acceleration is effective on scales significantly larger than in supernova remnants.
- The detected radio relic provides a measure of the magnetic field in a previously unexplored cosmic environment.
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