论文标题
JWST的群内光研究的新时代
A new era of intracluster light studies with JWST
论文作者
论文摘要
仍然没有探索，星系群中的扩散光在这些巨大结构的过去和正在进行的堆积中。在这里，我们介绍了使用JWST早期释放观测值的集群SMACS-J0723.3-7327（Z = 0.39）的簇内光（ICL）的首次全面研究。这些深层和高空间分辨率图像允许对ICL进行高信噪比的研究，高达$ \ sim400 $ kpc的径向距离，这是对中间红移簇的先前研究的两倍。这打开了探索构建ICL的丰富流程混合物的可能性。我们发现，内部零件（R $ <$ 100 kpc）是通过主要合并建造的，而外部部件（r $> $ 100 kpc）主要是由银河系状卫星的潮汐剥离而产生的。我们还发现，该集群ICL的恒星质量密度径向轮廓的斜率（$α_{3D} = -2.47 \ pM0.13 $）紧随预测的暗物质晕坡（$α___{$α__{3D \ mathrm {，dm}} = -2.6 $ $ -2 $），并构成$ -2 $ -2 $ -2 $ -2 $ -2 ICL作为星系簇中暗物质分布的示踪剂。 ICL的未来JWST研究将彻底改变我们对簇形成的理解，对于改善这些结构的重力透镜质量图至关重要，从而准确地表征了第一个星系的性质。
Still largely unexplored, the diffuse light in cluster of galaxies traces the past and on-going buildup of these massive structures. Here, we present the first comprehensive study of the intracluster light (ICL) of the cluster SMACS-J0723.3-7327 (z=0.39) using the JWST Early Release Observations. These deep and high spatial resolution images allow the study of the ICL with high signal-to-noise ratio up to a radial distance of $\sim400$ kpc, twice as far with respect to previous HST studies of intermediate redshift clusters. This opens up the possibility of exploring the rich mixture of processes that are building the ICL. We find that the inner parts (R$<$100 kpc) are built through a major merger while the outer parts (R$>$ 100 kpc) are mainly produced by the tidal stripping of Milky Way-like satellites. We also found that the slope of the stellar mass density radial profile of the ICL of this cluster ($α_{3D} = -2.47\pm0.13$) follows closely the predicted dark matter halo slope ($α_{3D\mathrm{,DM}} = -2.6$ to $-2$), supporting the idea that both components have a similar shape and thus the potential of using the ICL as a tracer of the dark matter distribution in clusters of galaxies. Future JWST studies of the ICL are set to revolutionise our understanding of cluster formation and will be crucial to improve the gravitational lensing mass maps of these structures and thus to accurately characterise the properties of the first galaxies.
