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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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Gamma-ray bursts: huge explosion in the early Universe
G Cusumano1, V Mangano, G Chincarini
1INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, 90146 Palermo, Italy. cusumano@ifc.inaf.it
Nature
|March 10, 2006
Summary
The most distant long gamma-ray burst (GRB) observed occurred 12.8 billion years ago. This cosmic explosion provides insights into early star formation and black hole development in the young universe.
Area of Science:
- Astronomy and Astrophysics
- Cosmology
- High-energy astrophysics
Background:
- Long gamma-ray bursts (GRBs) are energetic phenomena linked to massive star collapse.
- The early universe (around 890 million years post-Big Bang) was a period of significant star formation and evolution.
Purpose of the Study:
- To report and analyze observations of the most distant long gamma-ray burst (GRB 050904) ever detected.
- To investigate the conditions of the early universe, specifically star formation and black hole origins, near the reionization era.
Main Methods:
- Utilized gamma- and X-ray observations to detect and analyze GRB 050904.
- Determined the redshift (z = 6.29) of the GRB to establish its distance and age.
Main Results:
- GRB 050904 was detected at a redshift of 6.29, placing its origin 12.8 billion years in the past.
- The event occurred when the universe was approximately 890 million years old, near the cosmic reionization epoch.
- Confirmed the existence of massive star evolution and black hole formation in the early universe.
Conclusions:
- The observation of this distant GRB supports the collapsar model for long GRBs.
- Demonstrates that star formation and evolution, leading to black hole creation, occurred rapidly in the early universe.
- Provides crucial data for understanding galaxy evolution and the conditions during the reionization era.
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