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- W2399993470 abstract "Gamma-Ray Bursts (GRBs) are very energetic explosions. Probably they are the most energetic events in our universe following the Big Bang. A GRB is characterized by an intense flash of ∞-radiation, in which » 10 51 i 10 53 ergs is released in a few seconds, followed by an afterglow in all parts of the electromagnetic spectrum. Although not observed yet, theory suggests that the first generation of stars is a likely candidate for providing the progenitors of GRBs. In this article we will derive the GRB-rate for a dark matter halo at a redshift z. By using the Press-Schechter formalism we ask ourselves the question what the probability is that such a halo existed at that particular redshift. We will also derive a luminosity function for the afterglow following the actual GRB. The latter luminosity function will be compared with the sensitivities of the near infrared (NIR) camera on the upcoming James Webb Space Telescope (JWST). Finally we will try to infer whether we expect to find a GRB afterglow in a random field of the latter telescope. In 1963, during the cold war, a Nuclear Test Ban Treaty (NTBT) was signed by the governments of the USSR, the USA and the UK. This treaty prohibited the testing of nuclear devices in the atmosphere as well as in space. The USA wanted to make sure that the other countries involved did not violate the treaty and therefore they launched the Vela-satellites. These were satellites equipped with ∞, X-ray and neutron detectors. In this way nuclear activities in the atmosphere or in space would certainly be detected. However, the fourth version of the satellites detected a serie of ∞-flashes that did not have the characteristics of nuclear activities on earth. It was only later on, when the satellites were able to determine directions for the events, that these ∞-flashes turned out to have a cosmic origin. The discovery of GRBs in the late sixties was declassified in the beginning of the seventies. This lead to a burst of publications by astronomers wondering what was causing these ∞flashes. For a long time astronomers could not agree whether these flashes had a cosmological or a galactic origin. In 1990 the Compton Gamma-Ray Observatory was launched. This satellite was equipped with the Burst And Transient Source Experiment (BATSE), an instrument that was able to monitor almost the entire sky for ∞-flashes. It turned out that GRBs were randomly distributed across the sky, strongly favoring the theory of a cosmological origin. However, a lot of astronomers still believed that GRBs had their origin in the galactic halo because there" @default.
- W2399993470 created "2016-06-24" @default.
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- W2399993470 date "2008-01-01" @default.
- W2399993470 modified "2023-09-24" @default.
- W2399993470 title "Gamma-Ray Bursts at High Redshift" @default.
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