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arXiv 1306.0009astro-ph.CO
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利用透镜高红移星系束聚焦暖暗物质

Focusing on Warm Dark Matter with Lensed High-redshift Galaxies

Fabio Pacucci, Andrei Mesinger, Zoltan Haiman

摘要:

我们提出了一种新的高红移星系的使用,发现在深哈勃太空望远镜(HST)领域周围的强透镜集群。这些场在高放大率(μ > 10)下探测小的共动体积(约1000立方Mpc),并且可以探测到其他方法无法探测到的超暗星系。即使是在如此小的体积中发现的几个星系,也需要非常高的坍缩暗物质(DM)晕数密度。这意味着在小尺度上存在着显著的原始能量,这使得这些观测结果可以排除标准冷暗物质(CDM)模型的流行替代品,例如暖暗物质(WDM)。在这项工作中,我们解析计算WDM晕质量函数在z = 10,包括粒子自由流和剩余速度色散的影响。根据哈勃星系团透镜和超新星巡天(CLASH)观测到的两个星系在z约为10处的初始数密度,WDM粒子的质量在84%(99.9%)的置信限(对于退耦的热遗迹相对论性)下被限制在mx> 1(0.9)keV。这个极限只依赖于WDM晕质量函数,与以前对m_x的限制不同,它与任何天体物理模型无关。即将推出的HST前沿领域可以大大收紧这些限制。

英文摘要:

We propose a novel use of high-redshift galaxies, discovered in deep Hubble Space Telescope (HST) fields around strong lensing clusters. These fields probe small comoving volumes (about 1000 cubic Mpc) at high magnification (μ > 10), and can detect otherwise inaccessible ultra-faint galaxies. Even a few galaxies found in such small volumes require a very high number density of collapsed dark matter (DM) halos. This implies significant primordial power on small scales, allowing these observations to rule out popular alternatives to standard cold dark matter (CDM) models, such as warm dark matter (WDM). In this work, we analytically compute WDM halo mass functions at z = 10, including the effects of both particle free-streaming and residual velocity dispersion. The preliminary number density corresponding to the two galaxies at z about 10 already detected by the Cluster Lensing And Supernova survey with Hubble (CLASH) constrains the WDM particle mass to m_x > 1 (0.9) keV at 84% (99.9%) confidence limit (for a thermal relic relativistic at decoupling). This limit depends only on the WDM halo mass function and, unlike previous constraints on m_x, is independent of any astrophysical modeling. The forthcoming HST Frontier Fields can significantly tighten these constraints.

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