Gamma-ray bursts in the early Universe

2009 ◽  
Vol 5 (S265) ◽  
pp. 73-74
Author(s):  
Attila Mészáros ◽  
Jakub Řípa ◽  
David Huja
Keyword(s):  
Star Formation ◽  
Early Universe ◽  
Gamma Ray ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Gamma Ray Bursts

AbstractThe long gamma-ray bursts are at high redshifts, and they trace the star-formation rate. Hence, they may well serve as milestones in the early Universe.

Gamma-Ray Bursts and the Cosmic Star Formation Rate

1998 ◽  
Vol 506 (2) ◽  
pp. L81-L84 ◽  
Author(s):  
Mark Krumholz ◽  
S. E. Thorsett ◽  
Fiona A. Harrison
Keyword(s):  
Star Formation ◽  
Gamma Ray ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Gamma Ray Bursts

scholarly journals Connection between the Star Formation Rate and the Gamma-Ray Bursts

2012 ◽  
Vol 8 (S292) ◽  
pp. 334-334
Author(s):  
Attila Mészáros ◽  
Zsolt Bagoly ◽  
Lajos G. Balázs ◽  
István Horváth
Keyword(s):  
Star Formation ◽  
Gamma Ray ◽  
Star Formation Rate ◽  
Massive Stars ◽  
Formation Rate ◽  
Gamma Ray Bursts

AbstractIt is remarkable that the long gamma-ray bursts, as objects connected with the supernovae - i.e. with the end of the massive stars, trace the star formation rate. This connection is discussed in this contribution. The presentation is in essence a recapitulation of the article Mészáros A. et al. A&A, 2006, 455, 785.

scholarly journals Are LGRBs biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of LGRBs

2015 ◽  
Vol 11 (A29B) ◽  
pp. 249-250
Author(s):  
Susanna D. Vergani ◽  
Keyword(s):  
Star Formation ◽  
Gamma Ray ◽  
Star Formation Rate ◽  
Massive Stars ◽  
Formation Rate ◽  
Gamma Ray Bursts ◽  
Host Galaxies ◽  
Complete Sample ◽  
Rate Versus ◽  
High Metallicity

AbstractLong gamma-ray bursts (LGRBs) are associated to the deaths of massive stars and could thus be used as a potentially powerful tool to trace cosmic star formation. However the conditions needed to produce a LGRBs may introduce a bias in the LGRB rate versus star formation rate (SFR) relation (called LGRB efficiency hereafter).We have undertaken a study of the properties of the host galaxies of the BAT6 complete sample of LGRB to improve our knowledge on the LGRB efficiency, its redshift evolution, and the factor affecting it. This is the base to properly use LGRBs as SFR tracers.We show that at z < 1 LGRBs are not direct SFR tracers because they tend to avoid high-metallicity galaxies. The use of the BAT6 complete sample keeps this result from being affected by possible biases that could have influenced past results based on incomplete samples. The preference for low (but not extremely low) metallicities can be a consequence of the particular conditions needed for the progenitor star to produce a GRB.

scholarly journals Revealing the High-Redshift Star Formation Rate with Gamma-Ray Bursts

2008 ◽  
Vol 683 (1) ◽  
pp. L5-L8 ◽  
Author(s):  
Hasan Yüksel ◽  
Matthew D. Kistler ◽  
John F. Beacom ◽  
Andrew M. Hopkins
Keyword(s):  
Star Formation ◽  
Gamma Ray ◽  
Star Formation Rate ◽  
High Redshift ◽  
Formation Rate ◽  
Gamma Ray Bursts

scholarly journals The consequences of gamma-ray burst jet opening angle evolution on the inferred star formation rate

2020 ◽  
Vol 498 (4) ◽  
pp. 5041-5047
Author(s):  
Nicole M Lloyd-Ronning ◽  
Jarrett L Johnson ◽  
Aycin Aykutalp
Keyword(s):  
Star Formation ◽  
Early Universe ◽  
Gamma Ray ◽  
Star Formation Rate ◽  
High Redshift ◽  
Formation Rate ◽  
Opening Angle ◽  
Gamma Ray Burst ◽  
Order Of Magnitude ◽  
High Redshift Universe

ABSTRACT Gamma-ray burst (GRB) data suggest that the jets from GRBs in the high redshift universe are more narrowly collimated than those at lower redshifts. This implies that we detect relatively fewer long GRB progenitor systems (i.e. massive stars) at high redshifts, because a greater fraction of GRBs have their jets pointed away from us. As a result, estimates of the star formation rate (SFR; from the GRB rate) at high redshifts may be diminished if this effect is not taken into account. In this paper, we estimate the SFR using the observed GRB rate, accounting for an evolving jet opening angle. We find that the SFR in the early universe (z &gt; 3) can be up to an order of magnitude higher than the canonical estimates, depending on the severity of beaming angle evolution and the fraction of stars that make long GRBs. Additionally, we find an excess in the SFR at low redshifts, although this lessens when accounting for evolution of the beaming angle. Finally, under the assumption that GRBs do, in fact, trace canonical forms of the cosmic SFR, we constrain the resulting fraction of stars that must produce GRBs, again accounting for jet beaming-angle evolution. We find this assumption suggests a high fraction of stars in the early universe producing GRBs – a result that may, in fact, support our initial assertion that GRBs do not trace canonical estimates of the SFR.

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