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The Cosmic Evolution of Gamma-Ray Burst HostGalaxies
Published online by Cambridge University Press: 22 July 2013
Abstract
Due to their extreme luminosities, gamma-ray bursts (GRBs) can be detected in hostileregions of galaxies, nearby and at very high redshift, making them important cosmologicalprobes. The investigation of galaxies hosting long-duration GRBs (whose progenitor is amassive star) demonstrated their connection to star formation. Still, the link to thetotal galaxy population is controversial, mainly because of the small-number statistics:~1, 100 are the GRBs detected so far, ~280 those with measured redshift, and~70 the hosts studied in detail. These are typically low-redshift(z < 1.5), low luminosity, metal poor, and star-forming galaxies. Onthe other hand, at 1.5 < z < 4, massive, metal rich and dusty,interacting galaxies are not uncommon. The most distant population(z > 4) is poorly explored, but the deep limits reached point towardsvery small and star-forming objects, similar to the low-z population.This “back to the future” behavior is a natural consequence of the connection of long GRBsto star formation in young regions of the universe.
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- Research Article
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- © EAS, EDP Sciences 2013
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