论文标题
HI强度映射与Mightee调查:功率谱估计值
HI intensity mapping with the MIGHTEE survey: power spectrum estimates
论文作者
论文摘要
具有中性氢的强度映射(IM)是探测宇宙大规模结构的有前途的途径。在本文中,我们证明,使用64-dish Meerkat射电望远镜作为连接的干涉仪,可以在重新电源后宇宙中对HI进行统计检测。有了Mightee(Meerkat International GHz分层的爆炸外探索)调查项目,在L波段($ 856 <ν<1712 $ MHz,$ z <0.66 $)中,我们可以实现所需的敏感性,以衡量在Quasi-linear scales上衡量HI IM功能谱的所需敏感性,这些尺度将提供一个重要的辅助性辅助性,以实现重要的辅助效果。我们提出了一个专门建立的模拟管道,该管道模拟了Mightee观察结果,并预测了使用前景避免方法,在$ z = 0.27 $ $ z = 0.27 $上可以达到的约束。我们在COSMOS字段上使用当前的仿真介绍了功率谱估计,其中包括HI,噪声和点源模型的贡献,这些模型由观察到的Mightee数据构建。我们\ textIt {可见性}管道的结果与已经可用的Mightee数据达成了定性协议。本文表明,Meerkat可以通过对准线性尺度进行的全面调查(信噪比$> 7 $> 7 $ th $ K = 0.49 $ $ $ $ \ rm {mpc}^{ - 1} $)来检测HI(信噪比$> 7 $> 7 $红移空间扭曲和宇宙HI内容的测量最高为$ z \ sim 0.5 $。
Intensity mapping (IM) with neutral hydrogen is a promising avenue to probe the large scale structure of the Universe. In this paper, we demonstrate that using the 64-dish MeerKAT radio telescope as a connected interferometer, it is possible to make a statistical detection of HI in the post-reionization Universe. With the MIGHTEE (MeerKAT International GHz Tiered Extragalactic Exploration) survey project observing in the L-band ($856 < ν< 1712$ MHz, $z < 0.66$), we can achieve the required sensitivity to measure the HI IM power spectrum on quasi-linear scales, which will provide an important complementarity to the single-dish IM MeerKAT observations. We present a purpose-built simulation pipeline that emulates the MIGHTEE observations and forecast the constraints that can be achieved on the HI power spectrum at $z = 0.27$ for $k > 0.3$ $\rm{Mpc}^{-1}$ using the foreground avoidance method. We present the power spectrum estimates with the current simulation on the COSMOS field that includes contributions from HI, noise and point source models constructed from the observed MIGHTEE data. The results from our \textit{visibility} based pipeline are in qualitative agreement to the already available MIGHTEE data. This paper demonstrates that MeerKAT can achieve very high sensitivity to detect HI with the full MIGHTEE survey on quasi-linear scales (signal-to-noise ratio $> 7$ at $k=0.49$ $\rm{Mpc}^{-1}$) which are instrumental in probing cosmological quantities such as the spectral index of fluctuation, constraints on warm dark matter, the quasi-linear redshift space distortions and the measurement of the HI content of the Universe up to $z\sim 0.5$.