A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224.
A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224.
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对大质量星团 RCS 0224 后面 z ≳ 5 处的发射线星系进行的引力增强 MUSE 巡天。
DOI：
10.1093/mnras/stx245
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发表时间：
2017
影响因子：
4.8
通讯作者：
Lam
中科院分区：
文献类型：
--
作者：
R. Smit;A. M. Swinbank;R. Massey;J. Richard;I. Smail;J.;Icc Durham;Cral;Epfl;Lam
我们给出了一个非常大的望远镜/多单位光谱探测器(MUSE)对z=0.77星系团RCS0224−0002背后的透镜状高红移星系的观测。我们研究了一个通过星系团看到的高度放大的(μ∼29)z=4.88星系的详细内部性质。我们探测到来自该星系的广泛的星云C IVλλ1548,1551 A发射，以及一个明亮的Lyα晕，在图像平面上具有空间均匀的风和吸收轮廓。蓝移的高电离和低电离星际吸收表明银河系存在高速外流(Δv∼300 Km S−1)。与对z∼2−3星系的类似观测不同，从光晕发出的Lyα辐射出现在接近系统速度的地方-在速度偏移量上比在类似壳的外流模型中预测的要低一个数量级。为了解释这些观测，我们倾向于一个具有强烈速度梯度的外流模型，它改变了Lyα光子看到的有效列密度。我们还搜索了高红移的Lyα发射体，并在z=4.8时确定了14个候选辐射体，其中包括z=4.88时的过密度，其中只有一个在哈勃太空望远镜/用于测量的高级相机+广角相机3成像中检测到了对应的辐射体。
We present a Very Large Telescope/Multi Unit Spectroscopic Explorer (MUSE) survey of lensed high-redshift galaxies behind the z = 0.77 cluster RCS 0224−0002. We study the detailed internal properties of a highly magnified (μ ∼ 29) z = 4.88 galaxy seen through the cluster. We detect widespread nebular C iv λλ1548,1551 A emission from this galaxy as well as a bright Lyα halo with a spatially uniform wind and absorption profile across 12 kpc in the image plane. Blueshifted high- and low-ionization interstellar absorption indicate the presence of a high-velocity outflow (Δv ∼ 300 km s− 1) from the galaxy. Unlike similar observations of galaxies at z ∼ 2 − 3, the Lyα emission from the halo emerges close to the systemic velocity – an order of magnitude lower in velocity offset than predicted in ‘shell’-like outflow models. To explain these observations, we favour a model of an outflow with a strong velocity gradient, which changes the effective column density seen by the Lyα photons. We also search for high-redshift Lyα emitters and identify 14 candidates between z = 4.8 − 6.6, including an overdensity at z = 4.88, of which only one has a detected counterpart in Hubble Space Telescope/Advanced Camera for Surveys+Wide Field Camera 3 imaging.
影响因子：
4.9
作者：
Aravena, M.;Decarli, R.;Wagg, J.
通讯作者：
Wagg, J.