arXiv 1904.016042019-04-02astro-ph.CO

模糊暗物质宇宙中高红移星系团畸变的预言

Predictions for the Abundance of High-redshift Galaxies in a Fuzzy Dark Matter Universe

Yueying Ni, Mei-Yu Wang, Yu Feng, Tiziana Di Matteo

DOI：: 10.1093/mnras/stz2085

摘要：

在过去的几十年里，高红移星系静止系紫外光度函数（$z \geq 6$）的测量取得了迅速的进展。在这些红移的星系LF的暗端提供了强大的约束不同的暗物质模型，抑制小尺度结构的形成。在这项工作中，我们执行完整的流体动力学宇宙学模拟的星系形成使用的另一种DM模型组成的极轻玻色子粒子（$m \sim 10^{-22}$ eV），也被称为模糊暗物质（FDM），并检查在$z \geq 6$的FDM质量范围内的星系恒星质量函数和光度函数的预测。我们发现，对于玻色子质量为$m = 5\times10^{-22}$ eV的FDM模型，恒星质量为$\rm M_* \sim 10^7 M_{\odot}$的星系数密度在z = 9时被$\sim 40\%$抑制，在z = 5时被$\sim 20\%$抑制，在-16 < $M_{\rm UV}$ < -14星等范围内的紫外LF在$z = 9$时被$\sim 60\%$抑制，在$z = 5$时被$\sim 20\%$抑制.比较我们的预测与当前测量的模糊端LF（$-18 \leqslant M_{\rm UV} \leqslant -14$），我们发现，FDM模型与$m_{22} < 5\times10^{-22}$被排除在$3σ$置信水平。我们预计，未来的LF测量詹姆斯韦伯太空望远镜（JWST），这将延伸到$z \lesssim 10$的$M_{\rm UV} \sim -13$，调查体积相当于哈勃超深场（HUDF）将有能力限制FDM模型为$m\; \gtrsim 10^{-21}$ eV。

英文摘要：

During the last decades, rapid progress has been made in measurements of the rest-frame ultraviolet (UV) luminosity function (LF) for high-redshift galaxies ($z \geq 6$). The faint-end of the galaxy LF at these redshifts provides powerful constraints on different dark matter models that suppress small-scale structure formation. In this work we perform full hydrodynamical cosmological simulations of galaxy formation using an alternative DM model composed of extremely light bosonic particles ($m \sim 10^{-22}$ eV), also known as fuzzy dark matter (FDM), and examine the predictions for the galaxy stellar mass function and luminosity function at $z \geq 6$ for a range of FDM masses. We find that for FDM models with bosonic mass $m = 5\times10^{-22}$ eV, the number density of galaxies with stellar mass $\rm M_* \sim 10^7 M_{\odot}$ is suppressed by $\sim 40\%$ at z = 9, $\sim 20\%$ at z = 5, and the UV LFs within magnitude range of -16 < $M_{\rm UV}$ < -14 is suppressed by $\sim 60\%$ at $z = 9$, $\sim 20\%$ at $z = 5$ comparing to the CDM counterpart simulation. Comparing our predictions with current measurements of the faint-end LFs ($-18 \leqslant M_{\rm UV} \leqslant -14$), we find that FDM models with $m_{22} < 5\times10^{-22}$ are ruled out at $3σ$ confidence level. We expect that future LF measurements by James Webb Space Telescope (JWST), which will extend down to $M_{\rm UV} \sim -13$ for $z \lesssim 10$, with a survey volume that is comparable to the Hubble Ultra Deep Field (HUDF) would have the capability to constrain FDM models to $m\; \gtrsim 10^{-21}$ eV.

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