We report the detection of a large (∼ 90 kpc) and luminous Lyα nebula [LLyα = (6.80±0.08) ×10 erg s−1] around an optically faint (r> 23 mag) radio galaxy M15132524 at zem=3.132. The double-lobed radio emission has an extent of 184 kpc, but the radio core, i.e., emission associated with the active galactic nucleus (AGN) itself, is barely detected. This object was found as part of our survey to identify high-z quasars based on Wide-field Infrared Survey Explorer (WISE) colors. The optical spectrum has revealed Lyα, Nv, C iv and He ii emission lines with a very weak continuum. Based on long-slit spectroscopy and narrow band imaging centered on the Lyα emission, we identify two spatial components: a “compact component” with high velocity dispersion (∼ 1500 km s−1) seen in all three lines, and an “extended component”, having low velocity dispersion (i.e., 700-1000 km s−1). The emission line ratios are consistent with the compact component being in photoionization equilibrium with an AGN. We also detect spatially extended associated Lyα absorption, which is blue-shifted within 250400 km s−1 of the Lyα peak. The probability of Lyα absorption detection in such large radio sources is found to be low (∼10%) in the literature. M1513-2524 belongs to the top few percent of the population in terms of Lyα and radio luminosities. Deep integral field spectroscopy is essential for probing this interesting source and its surroundings in more detail.

中文翻译：

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来自 WISE 选择的光学微弱强大射电星系 M151304.72-252439.7 在 z = 3.132* 处的 Lyman-α 发射

我们报告了在 zem=3.132 的光学微弱（r> 23 mag）射电星系 M15132524 周围检测到一个大型（~ 90 kpc）和明亮的 Lyα 星云 [LLyα = (6.80±0.08) ×10 erg s−1]。双瓣无线电发射的范围为 184 kpc，但几乎没有检测到无线电核心，即与活动星系核 (AGN) 本身相关的发射。该天体是我们在基于广域红外巡天探测器 (WISE) 颜色识别高 z 类星体的调查中发现的。光谱显示 Lyα、Nv、C iv 和 He ii 发射线具有非常弱的连续谱。基于以 Lyα 发射为中心的长缝光谱和窄带成像，我们确定了两个空间分量：在所有三条谱线上都看到的具有高速色散（~ 1500 km s-1）的“紧凑分量”，以及”, 具有低速度色散（即 700-1000 km s-1）。发射线比率与与 AGN 处于光电离平衡的致密组件一致。我们还检测到空间扩展相关的 Lyα 吸收，它在 Lyα 峰的 250400 km s−1 内发生蓝移。在文献中发现在如此大的无线电源中检测到 Lyα 吸收的概率很低（~10%）。M1513-2524 在 Lyα 和射电光度方面属于人口的前几个百分比。深积分场光谱对于更详细地探测这个有趣的源及其周围环境至关重要。在距离 Lyα 峰 250400 km s−1 范围内发生蓝移。在文献中发现在如此大的无线电源中检测到 Lyα 吸收的概率很低（~10%）。M1513-2524 在 Lyα 和射电光度方面属于人口的前几个百分比。深积分场光谱对于更详细地探测这个有趣的源及其周围环境至关重要。在距离 Lyα 峰 250400 km s−1 范围内发生蓝移。在文献中发现在如此大的无线电源中检测到 Lyα 吸收的概率很低（~10%）。M1513-2524 在 Lyα 和射电光度方面属于人口的前几个百分比。深积分场光谱对于更详细地探测这个有趣的源及其周围环境至关重要。