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On The Origin Of The Highest Redshift Gamma-Ray Burst GRB 080913 | | Krzysztof Belczynski
; Dieter H. Hartmann
; Chris L. Fryer
; Daniel E. Holz
; Brian O'Shea
; | | Date: |
12 Dec 2008 | | Abstract: | GRB 080913, discovered by SWIFT, is the most distant gamma-ray burst (GRB)
known to-date, with a spectroscopically determined redshift of z=6.7. The
detection of a burst at such an early epoch of the Universe significantly
constrains the nature of GRBs and their progenitors. To evaluate these
constraints, we perform population synthesis studies of the formation and
evolution of early stars and calculate the resulting formation rates of short-
and long-duration GRBs at high redshift. The peak of the GRB rate from
Population II stars occurs at z=7 for a model with efficient/fast mixing of
metals, while it is found at z=3 for an inefficient/slow metallicity evolution
model. We show that for at z=6.7 essentially all GRBs originate from Population
II stars, independent of the adopted metallicity evolution model. At this epoch
Population III (metal free) stars, representing the very first generation of
stars, most likely have already completed their evolution, and Population I
stars (representing the present population) have just begun forming. We argue
that Population II stars (having small, but non-zero metallicity) are the most
likely progenitors of both long GRBs (collapsars) and short GRBs (NS-NS or
BH-NS mergers) in the redshift range 6<z<10. Since the predicted rates, after
correction for modeling and observational biases, are very similar at these
epochs we cannot definitively conclude which of these two progenitor scenarios
is more likely in the case of GRB 080913. Further information about these
high-z events, such as their spectral energy distribution and host galaxy
properties, will be needed for a much larger sample to consolidate the
progenitor models considered here. | | Source: | arXiv, 0812.2470 | | Services: | Forum | Review | PDF | Favorites | |
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