scholarly journals The Luminosity Function of Long Gamma-Ray Burst and their rate at z ≥ 6

2008 ◽  
Vol 4 (S255) ◽  
pp. 212-216
Author(s):  
R. Salvaterra ◽  
S. Campana ◽  
G. Chincarini ◽  
T. R. Choudhury ◽  
S. Covino ◽  
...  
Keyword(s):  
Star Formation ◽  
Luminosity Function ◽  
Gamma Ray ◽  
Formation Rate ◽  
Gamma Ray Bursts ◽  
Test Model ◽  
The Past ◽  
Model Predictions ◽  
Low Metallicity ◽  
Luminosity Evolution

AbstractWe compute the luminosity function (LF) and the formation rate of long gamma ray bursts (GRBs) in three different scenarios: i) GRBs follow the cosmic star formation and their LF is constant in time; ii) GRBs follow the cosmic star formation but the LF varies with redshift; iii) GRBs form preferentially in low–metallicity environments. We then test model predictions against the Swift 3-year data, showing that scenario i) is robustly ruled out. Moreover, we show that the number of bright GRBs detected by Swift suggests that GRBs should have experienced some sort of luminosity evolution with redshift, being more luminous in the past. Finally we propose to use the observations of the afterglow spectrum of GRBs at z ≥ 5.5 to constrain the reionization history, and then applied our method to the case of GRB 050904.

scholarly journals The HerMES Local Luminosity Function

2015 ◽  
Vol 11 (S315) ◽  
Author(s):  
Lucia Marchetti ◽  
Mattia Vaccari ◽  
Alberto Franceschini
Keyword(s):  
Star Formation ◽  
Data Fusion ◽  
Luminosity Function ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Accurate Determination ◽  
Far Infrared ◽  
Rate Function ◽  
Model Predictions ◽  
Multi Wavelength

AbstractWe exploit the Herschel Extragalactic Multi-Tiered Survey (HerMES) dataset along with ancillary multi-wavelength photometry and spectroscopy from the Spitzer Data Fusion to provide the most accurate determination to date of the local (0.02<z<0.5) Far-Infrared Luminosity and Star Formation Rate Function. We present and compare our results with model predictions as well as other multi-wavelength estimates of the local star formation rate density.

scholarly journals Formation Rate, Evolving Luminosity Function, Jet Structure, and Progenitors for Long Gamma‐Ray Bursts

2004 ◽  
Vol 611 (2) ◽  
pp. 1033-1040 ◽  
Author(s):  
Claudio Firmani ◽  
Vladimir Avila‐Reese ◽  
Gabriele Ghisellini ◽  
Alexander V. Tutukov
Keyword(s):  
Luminosity Function ◽  
Gamma Ray ◽  
Formation Rate ◽  
Gamma Ray Bursts ◽  
Jet Structure

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 The luminosity function and formation rate of a complete sample of long gamma-ray bursts

2019 ◽  
Vol 488 (4) ◽  
pp. 4607-4613 ◽  
Author(s):  
Guang-Xuan Lan ◽  
Hou-Dun Zeng ◽  
Jun-Jie Wei ◽  
Xue-Feng Wu
Keyword(s):  
Luminosity Function ◽  
Gamma Ray ◽  
Formation Rate ◽  
Gamma Ray Bursts ◽  
Likelihood Method ◽  
Complete Sample ◽  
Empirical Density ◽  
Power Law Function ◽  
Current Sample ◽  
First Time

ABSTRACT We study the luminosity function and formation rate of long gamma-ray bursts (GRBs) by using a maximum likelihood method. This is the first time this method is applied to a well-defined sample of GRBs that is complete in redshift. The sample is composed of 99 bursts detected by the Swift satellite, 81 of them with measured redshift and luminosity for a completeness level of $82\, {\rm per\, cent}$. We confirm that a strong redshift evolution in luminosity (with an evolution index of $\delta =2.22^{+0.32}_{-0.31}$) or in density ($\delta =1.92^{+0.20}_{-0.21}$) is needed in order to reproduce the observations well. But since the predicted redshift and luminosity distributions in the two scenarios are very similar, it is difficult to distinguish between these two kinds of evolutions only on the basis of the current sample. Furthermore, we also consider an empirical density case in which the GRB rate density is directly described as a broken power-law function and the luminosity function is taken to be non-evolving. In this case, we find that the GRB formation rate rises like $(1+z)^{3.85^{+0.48}_{-0.45}}$ for $z\lesssim 2$ and is proportional to $(1+z)^{-1.07^{+0.98}_{-1.12}}$ for $z\gtrsim 2$. The local GRB rate is $1.49^{+0.63}_{-0.64}$ Gpc−3 yr−1. The GRB rate may be consistent with the cosmic star formation rate (SFR) at $z\lesssim 2$, but shows an enhancement compared to the SFR at $z\gtrsim 2$.

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.

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.

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