期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 213, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0067-0049/213/1/15
关键词
gamma-ray burst: general; stars: formation
资金
- National Basic Research Program of China (973 Program) [2014CB845800]
- Excellent Youth Foundation of Uiangsu Province
- National Natural Science Foundation of China [11373022, 11103007, 11033002]
We investigate the mass distribution of long gamma-ray burst (GRB) host galaxies and the redshift distribution of long GRBs by considering that long GRBs occur in low-metallicity environments. We calculate the upper limit on the stellar mass of a galaxy which can produce long GRBs by utilizing the mass-metallicity (M-Z) relation of galaxies. After comparing with the observed GRB host galaxies masses, we find that the observed GRB host galaxy masses can fit the predicted masses well if GRBs occur in low-metallicity 12 + log(O/H)(KK04) < 8.7. GRB host galaxies have low metallicity, low mass, and high star formation rate compared with galaxies of seventh data release of the Sloan Digital Sky Survey. We also study the cumulative redshift distribution of the latest Swift long GRBs by adding dark GRBs and 10 new GRBs redshifts from the TOUGH survey. The observed discrepancy between the GRB rate and the star formation history can be reconciled by considering that GRBs tend to occur in low-metallicity galaxies with 12 + log(O/H)(KK04) < 8.7. We conclude that the metallicity cutoff that can produce long GRBs is about 12 + log(O/H)(KK04) < 8.7 from the host mass distribution and redshift distribution.
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