Gamma-ray burst host galaxies at low and high redshift

The galaxies hosting the most energetic explosions in the universe, the gamma-ray bursts (GRBs), are generally found to be low-mass, metal poor, blue and star forming galaxies. However, the majority of the targets investigated so far (less than 100) are at relatively low redshift, z<2. We know that at low redshift, the cosmic star formation is predominantly in small galaxies. Therefore, at low redshift, long-duration GRBs, which are associated with massive stars, are expected to be in small galaxies. Preliminary investigations of the stellar mass function of z<1.5 GRB hosts does not indicate that these galaxies are different from the general population of nearby star-forming galaxies. At high-z, it is still unclear whether GRB hosts are different. Recent results indicate that a fraction of them might be associated with dusty regions in massive galaxies. Remarkable is the a super-solar metallicity measured in the interstellar medium of a z=3.57 GRB host.

Gamma-ray burst host galaxies at low and high redshift / Savaglio, Sandra. - In: ASTRONOMISCHE NACHRICHTEN. - ISSN 0004-6337. - 333(2012), pp. 480-485.

Titolo: Gamma-ray burst host galaxies at low and high redshift
Autori: 
SAVAGLIO, Sandra
Data di pubblicazione: 2012
Rivista: 
ASTRONOMISCHE NACHRICHTEN  
Citazione: Gamma-ray burst host galaxies at low and high redshift / Savaglio, Sandra. - In: ASTRONOMISCHE NACHRICHTEN. - ISSN 0004-6337. - 333(2012), pp. 480-485.
Handle: http://hdl.handle.net/20.500.11770/144072
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