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Long GRBs as a Tool to Investigate Star Formation in Dark Matter Halos | | Jun-Jie Wei
; Jing-Meng Hao
; Xue-Feng Wu
; Ye-Fei Yuan
; | | Date: |
14 Nov 2015 | | Abstract: | First stars can only form in structures that are suitably dense, which can be
parametrized by the minimum dark matter halo mass $M_{
m min}$. $M_{
m min}$
must plays an important role in star formation. The connection of long
gamma-ray bursts (LGRBs) with the collapse of massive stars has provided a good
opportunity for probing star formation in dark matter halos. We place some
constraints on $M_{
m min}$ using the latest $Swift$ LGRB data. We
conservatively consider that LGRB rate is proportional to the cosmic star
formation rate (CSFR) and an additional evolution parametrized as
$(1+z)^{alpha}$, where the CSFR model as a function of $M_{
m min}$. Using
the $chi^{2}$ statistic, the contour constraints on the $M_{
m
min}$--$alpha$ plane show that at the $1sigma$ confidence level, we have
$M_{
m min}<10^{10.5}$ $
m M_{odot}$ from 118 LGRBs with redshift $z<4$ and
luminosity $L_{
m iso}>1.8 imes10^{51}$ erg $
m s^{-1}$. We also find that
adding 12 high-emph{z} $(4<z<5)$ LGRBs (consisting of 104 LGRBs with $z<5$ and
$L_{
m iso}>3.1 imes10^{51}$ erg $
m s^{-1}$) could result in much tighter
constraints on $M_{
m min}$, for which, $10^{7.7}
m M_{odot}<M_{
m
min}<10^{11.6}
m M_{odot}$ ($1sigma$). Through Monte Carlo simulations, we
estimate that future five years of Sino-French spacebased multiband
astronomical variable objects monitor (emph{SVOM}) observations would tighten
these constraints to $10^{9.7}
m M_{odot}<M_{
m min}<10^{11.3}
m
M_{odot}$. The strong constraints on $M_{
m min}$ indicate that LGRBs are a
new promising tool for investigating star formation in dark matter halos. | | Source: | arXiv, 1511.4483 | | Services: | Forum | Review | PDF | Favorites | |
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