Estimation of the star formation rate using Long-Gamma ray bursts observed by swift

Abstract In this work we estimate the star formation rate (SFR) through 333 LongGRBs detected by Swift. This investigation is based on the empirical model proposed by Yüksel et al. (2008). Basically, the SFR is estimated using long-GRBs considering that they have a stellar origin based on the collap...

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Bibliographic Details
Published inRevista mexicana de astronomía y astrofísica Vol. 54; no. 2; pp. 309 - 316
Main Authors Elías, M., Martínez, O. M.
Format Journal Article
LanguagePortuguese
Published Instituto de Astronomía, UNAM 01.10.2018
Subjects
Astronomy & Astrophysics
stars: massive
gamma-ray burst: general
galaxies: star formation
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Summary:Abstract In this work we estimate the star formation rate (SFR) through 333 LongGRBs detected by Swift. This investigation is based on the empirical model proposed by Yüksel et al. (2008). Basically, the SFR is estimated using long-GRBs considering that they have a stellar origin based on the collapsar model or the collapse of massive stars (hypernovae) M > 20M⊙. The analysis starts with the study of ε(z) which accounts for the long-GRBs production rate and is parameterized by ε(z) = ε0(1 + z)δ, where ε0 includes the SFR absolute conversion to GRBs rate in a luminosity range already defined and δ is a dynamical parameter which changes at different regions of redshift; it accounts for the SFR slope which is obtained by an analysis of linear regression over our long-GRBs sample. The results obtained provide evidence that supports our proposal to use Long-GRBs as tracers of SFR.
ISSN:0185-1101