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arXiv 1306.2314astro-ph.CO
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暖暗物质作为小尺度危机的解决方案:来自高红移莱曼α森林数据的新约束

Warm Dark Matter as a solution to the small scale crisis: new constraints from high redshift Lyman-alpha forest data

M. Viel, G. D. Becker, J. S. Bolton, M. G. Haehnelt

摘要:

我们提出了更新的约束的自由流动的温暖暗物质(WDM)粒子的Lya通量功率谱的分析来自高分辨率光谱的25 z > 4类星体获得的凯克高分辨率Echelle光谱仪(HIRES)和麦哲伦稻盛京瓷Echelle(MIKE)光谱仪。我们利用一套新的高分辨率流体动力学模拟,探索WDM质量的1,2和4千电子伏(假设WDM由热文物),随着不同的物理动机的热历史。我们仔细地解决了不同来源的系统误差,可能会影响我们的最终结果,并执行保守的误差估计的Lya通量功率的分析。通过对多维天体物理学和宇宙学参数空间进行采样的方法,我们得到了早期退耦热遗迹形式的暖暗物质粒子的mwdm下限> 3.3 keV(2sigma).增加斯隆数字巡天(SDSS)Lya通量功率谱并没有改善这一限制。质量为1 keV、2 keV和2.5 keV的热遗迹在约9 sigma、4 sigma和3 sigma C.L.处的数据不利,分别我们的分析不赞成WDM模型,其中在对应于k= 10 h/Mpc的(非线性)尺度下线性物质功率谱中存在抑制,其偏离LCDM模型超过10%。给定这个极限,相应的“自由流动质量”为2x10^8 Msun/h,低于该值,质量函数可能被抑制。因此,对于所谓的冷暗物质的小规模危机的解决方案,WDM的自由流贡献的空间非常小。

英文摘要:

We present updated constraints on the free-streaming of warm dark matter (WDM) particles derived from an analysis of the Lya flux power spectrum measured from high-resolution spectra of 25 z > 4 quasars obtained with the Keck High Resolution Echelle Spectrometer (HIRES) and the Magellan Inamori Kyocera Echelle (MIKE) spectrograph. We utilize a new suite of high-resolution hydrodynamical simulations that explore WDM masses of 1, 2 and 4 keV (assuming the WDM consists of thermal relics), along with different physically motivated thermal histories. We carefully address different sources of systematic error that may affect our final results and perform an analysis of the Lya flux power with conservative error estimates. By using a method that samples the multi-dimensional astrophysical and cosmological parameter space, we obtain a lower limit mwdm > 3.3 keV (2sigma) for warm dark matter particles in the form of early decoupled thermal relics. Adding the Sloan Digital Sky Survey (SDSS) Lya flux power spectrum does not improve this limit. Thermal relics of masses 1 keV, 2 keV and 2.5 keV are disfavoured by the data at about the 9sigma, 4sigma and 3sigma C.L., respectively. Our analysis disfavours WDM models where there is a suppression in the linear matter power spectrum at (non-linear) scales corresponding to k=10h/Mpc which deviates more than 10% from a LCDM model. Given this limit, the corresponding "free-streaming mass" below which the mass function may be suppressed is 2x10^8 Msun/h. There is thus very little room for a contribution of the free-streaming of WDM to the solution of what has been termed the small scale crisis of cold dark matter.

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