Back to Search
Start Over
The redshift selected sample of long gamma-ray burst host galaxies: the overall metallicity distribution at $z < 0.4$
- Publication Year :
- 2016
-
Abstract
- We discuss the host galaxy metallicity distribution of all long gamma-ray bursts (GRBs) whose redshifts are known to be $< 0.4$, including newly obtained spectroscopic datasets of the host galaxies of GRB 060614, 090417B, and 130427A. We compare the metallicity distribution of the low-redshift sample to the model predictions, and constrain the relation between metallicity and GRB occurrence. We take account of spatial variation of metallicities among star forming regions within a galaxy. We found that the models, in which only low-metallicity stars produce GRBs with a sharp cutoff of GRB production efficiency around 12+log(O/H) $\sim$ 8.3, can well reproduce the observed distribution, while the models with no metallicity dependence are not consistent with the observations. We also discuss possible sampling biases we may suffer by collecting long GRBs whose redshifts are known, presenting the photometric observations of the host galaxy of GRB 111225A at $z = 0.297$ whose redshift has been undetermined until $\sim$ 2.3 years after the burst.<br />Comment: 23 pages, 14 figures, 8 tables, accepted for publication in PASJ
- Subjects :
- Physics
010308 nuclear & particles physics
Metallicity
Astrophysics::High Energy Astrophysical Phenomena
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Production efficiency
01 natural sciences
Astrophysics - Astrophysics of Galaxies
Redshift
Galaxy
Stars
Distribution (mathematics)
Space and Planetary Science
0103 physical sciences
Cutoff
Gamma-ray burst
Astrophysics - High Energy Astrophysical Phenomena
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....c584902e5a21bbd4f29cfe8f909e612b