Galaxies as seen through the most Energetic Explosions in the Universe
Sandra Savaglio (University of Calabria & European Southern, Observatory)

TL;DR
This paper explores the role of gamma-ray bursts (GRBs) as probes of galaxy formation and evolution across cosmic time, highlighting their potential to reveal properties of distant and obscured galaxies.
Contribution
It proposes that high-redshift GRBs may have occurred in primordial globular clusters, offering new insights into early galaxy environments and star formation history.
Findings
Long GRB host galaxies vary with redshift, from small and metal-poor to massive and dusty.
High-redshift GRB hosts are likely very small, possibly primordial, systems.
GRB progenitors are massive, short-lived stars linked to star formation history.
Abstract
A gamma-ray burst (GRB) is a strong and fast gamma-ray emission from the explosion of stellar systems (massive stars or coalescing binary compact stellar remnants), happening at any possible redshift, and detected by space missions. Although GRBs are the most energetic events after the Big Bang, systematic search (started after the first localization in 1997) led to only 374 spectroscopic redshift measurements. For less than half, the host galaxy is detected and studied in some detail. Despite the small number of known hosts, their impact on our understanding of galaxy formation and evolution is immense. These galaxies offer the opportunity to explore regions which are observationally hostile, due to the presence of gas and dust, or the large distances reached. The typical long-duration GRB host galaxy at low redshift is small, star-forming and metal poor, whereas, at intermediate…
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