Long GRBs as a tool to investigate star formation in dark matter halos

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• 作者：Jun-Jie Wei^a ; Jing-Meng Hao^b ; ^c ; Xue-Feng Wu^a ; ^d ; ^{xfwu@pmo.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Ye-Fei Yuan^e ; ^{yfyuan@ustc.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gamma-ray burst ; general ; Galaxy ; evolution ; Stars ; formation
• 刊名：Journal of High Energy Astrophysics
• 出版年：2016
• 出版时间：March-June 2016
• 年：2016
• 卷：9-10
• 期：Complete
• 页码：1-8
• 全文大小：750 K

文摘

First stars can only form in structures that are suitably dense, which can be parametrized by the minimum dark matter halo mass the MathML source">M_min$M_{\min }$. the MathML source">M_min$M_{\min }$ must play 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 the MathML source">M_min$M_{\min }$ 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 the MathML source">(1+z)^α${(1+z)}^{\alpha }$, where the CSFR model is a function of the MathML source">M_min$M_{\min }$. Using the the MathML source">χ²${\chi }^2$ statistic, the contour constraints on the the MathML source">M_min$M_{\min }$–α plane show that at the 1σ   confidence level, we have the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2214404815000658&_mathId=si4.gif&_user=111111111&_pii=S2214404815000658&_rdoc=1&_issn=22144048&md5=679c96601d65dd7456745dea8a8f6444">the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2214404815000658-si4.gif">$M_{\min }<{10}^{10.5}{\mathrm{M}}_{\odot }$ from 118 LGRBs with redshift the MathML source">z<4$z<4$ and luminosity the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2214404815000658&_mathId=si6.gif&_user=111111111&_pii=S2214404815000658&_rdoc=1&_issn=22144048&md5=98623f2db2e2959679a0ce33bcdfb238">the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2214404815000658-si6.gif">$L_{\mathrm{iso}}>1.8\times {10}^{51}\text{erg}{\text{s}}^{-1}$. We also find that adding 12 high-z  the MathML source">(4<z<5)$(4<z<5)$ LGRBs (consisting of 104 LGRBs with the MathML source">z<5$z<5$ and the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2214404815000658&_mathId=si144.gif&_user=111111111&_pii=S2214404815000658&_rdoc=1&_issn=22144048&md5=435f550fdbd5fe8046816b99292f840d">the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2214404815000658-si144.gif">$L_{\mathrm{iso}}>3.1\times {10}^{51}\text{erg}{\text{s}}^{-1}$) could result in much tighter constraints on the MathML source">M_min$M_{\min }$, for which, the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2214404815000658&_mathId=si10.gif&_user=111111111&_pii=S2214404815000658&_rdoc=1&_issn=22144048&md5=6a8fb0330aa634e01369d1c54b2f524f">the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2214404815000658-si10.gif">${10}^{7.7}{\mathrm{M}}_{\odot }<M_{\min }<{10}^{11.6}{\mathrm{M}}_{\odot }$ (1σ). Through Monte Carlo simulations, we estimate that future five years of Sino–French spacebased multiband astronomical variable objects monitor (SVOM  ) observations would tighten these constraints to the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2214404815000658&_mathId=si11.gif&_user=111111111&_pii=S2214404815000658&_rdoc=1&_issn=22144048&md5=65c3e27d9257f8803959c22fb5e051c1">the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2214404815000658-si11.gif">${10}^{9.7}{\mathrm{M}}_{\odot }<M_{\min }<{10}^{11.3}{\mathrm{M}}_{\odot }$. The strong constraints on the MathML source">M_min$M_{\min }$ indicate that LGRBs are a new promising tool for investigating star formation in dark matter halos.