Gamma-Ray Bursts (GRBs) and High Redshift Universe

Eze, Ambrose and Eze, R.N (2019) Gamma-Ray Bursts (GRBs) and High Redshift Universe. Godfrey Okoye University, Enugu.

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Gamma-Ray Bursts (GRBs) are the brightest and most concentrated electromagnetic explosion in the universe. They are sudden, intense flashes of random distributed gamma-rays which for a few seconds completely outstrip all other sources of gamma-rays in the sky, including those coming from the sun. GRBs as the most luminous events exist as long-duration, soft-spectrum bursts which last for hundreds of seconds and short-duration, hard-spectrum bursts which last for a few milliseconds. GRBs are believed to occur as a result of the collapse of a massive star. It is expected that the GRB rate is approximately proportional to the star formation rate (SFR), and they could be used to find supernovae (SNe) at very high redshift. The high luminosity of the early afterglow and GRB transient nature makes GRBs powerful sources to study the metal enrichment and interstellar medium properties of their hosts and the correlations between GRB spectral properties and the collimation corrected energetic could be used to constrain cosmological parameters (Ωm, ΩΛ) which determine the geometry of the universe. GRBs and their afterglow acts as a new cosmological tool to trace metallicity, and this offer a unique explanation of large-scale structure (galaxies, clusters and super clusters), and as a probe of the high redshift universe.

Item Type: Article
Subjects: L Education > L Education (General)
Q Science > Q Science (General)
Divisions: Faculty of Natural and Applied Sciences
Depositing User: miss ifeoma agbo
Date Deposited: 03 May 2019 10:02
Last Modified: 03 May 2019 10:02

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