the gamma radiation is a particularly high-energy electromagnetic radiation that originates in the cosmos, if the particles of the cosmic rays with matter or radiation interact. Together with other information sources, such as light of other wavelengths, Neutrinos, or gravitational waves, this radiation can be used to learn something about the most extreme regions of our universe, such as, for example, the environment of supermassive black holes in active galactic nuclei.
Sibylle Anderl
editor in the features section.
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scientists have now developed with the help of the for the past ten years, operated “the Fermi Gamma-ray Space Telescope” another issue: As currently in “Science”, it is reported, were you able to trace on the basis of the observation of 739 active galaxies and Gamma-ray burst, the cosmic star formation history from a time when less than 1.5 billion years after the big Bang until today. They also took advantage of the fact that gamma-radiation with the radiation of those acts of exchange, which is generated by stars – the so-called extragalactic background light.
Since the resulting absorption features due to the cosmic Expansion can be assigned on the basis of their Position in the spectrum of a cosmic time that was a historical reconstruction of the sequence of star births. The astronomers identified a Maximum in the star formation of around ten billion years ago. This result is consistent with the results of independent surveys of the Sky to reconstruct the star formation directly on the basis of the star light.
