Using Lyα emission line as a tracer of high redshift star forming galaxies, hundreds of Lyα emission line galaxies (LAEs) at z > 5 have been detected. These LAEs are considered to be low mass young galaxies, critical to the reionization of the universe and the metal enrichment of circumgalactic medium (CGM) and intergalactic medium (IGM). It is assumed that outflows in LAEs can help ionizing photons and Lyα photons escape out of galaxies. However we still know little about the outflows in high redshifts LAEs due to observational difficulties, especially at redshift > 5. Models of Lyα radiative transfer predict asymmetric Lyα line profiles with broad red wing in LAEs with outflows. Here we report a z ~ 5.7 Lyα emission line with a broad red wing extending to > 1000 km/s relative to the peak of Lyα line, which has been detected in only a couple of z > 5 LAEs till now. If the broad red wing is ascribed to gas outflow instead of AGN activity, the outflow velocity could be larger than the escape velocity (~ 500 km/s) of typical halo mass of z ~ 5.7 LAEs, being consistent with the picture that outflows in LAEs disperse metals to CGM and IGM.
Faint CO Line Wings in Four Star-Forming (Ultra)luminous Infrared Galaxies
我们报告的搜索结果大的速度宽度,低强度线翼-一个常用的签名的分子外流-在四个低红移(超)发光红外星系(U/LIRGs),似乎是由恒星形成为主。这些目标是从Chung等人(2011年)提出的14个这样的星系样本中提取的,他们展示了样本的堆叠CO光谱,展示了1000 km/s宽的线翼。我们使用IRAM Plateau de Bure干涉仪对目标进行了灵敏的宽带成像。我们检测每个目标在非常高的意义,但没有发现声称的线翼在这四个目标。相反,我们将线翼中的通量限制为仅百分之几。根据Cicone et al.(2014),将我们的结果作为质量流出率,我们表明它们与这样一幅图像相一致,即非常高的质量加载因子优先发生在活动星系核对其辐射光度贡献很大的系统中。我们确定我们的目标之一,IRAS 05083(VII Zw 31),作为候选分子流出。
Broad [CII] line wings as tracer of molecular and multi-phase outflows in infrared bright galaxies
我们报告了一个22个本地和明亮的超亮红外星系(ULIRGs)的样本中来自$119\,μ\text{m}$ OH吸收和$158\,μ\text{m}$ [CII]发射的流出特性之间的初步相关性。对于这个样本,我们调查是否[CII]宽的翅膀是一个很好的示踪剂的分子外流,以及如何连接的两个示踪剂。在我们的样本中,有14个物体有一个宽的机翼组件,由[CII]跟踪,所有这些也显示出OH 119吸收指示流出(在1例流入)。其他8例没有发现宽[CII]成分,主要是没有OH流出或低速($\leq 100\,\text{km s}^{-1}$)OH流出的物体。宽[CII]分量的半峰全宽(FWHM)显示出与OH 119蓝移速度的趋势,尽管具有显著的分散性。此外,尽管有很大的不确定性,流出质量来自OH和广泛的[CII]显示1:1的关系。因此,主要结论是,宽[CII]翼可以用来跟踪分子流出。这可能在高红移时特别相关,在高红移时,分子气体的通常示踪物(如低J CO线)变得难以观察。此外,蓝移Na I D $λλ5890,5896$吸收的观测可用于我们的10个源。Na I D的流出速度与OH速度和宽的[CII] FWHM有一定的关系。这些观察结果表明,流出的原子和分子气相是相连的。
Improving photometric redshifts of Epoch of Reionization galaxies: a new empirical transmission curve with neutral hydrogen damping wing Ly$α$ absorption
Power-law Emission-line Wings and Radiation-Driven Superwinds in Local Lyman Continuum Emitters
University of Michigan(密歇根大学);University of Geneva(日内瓦大学);Space Telescope Science Institute(太空望远镜科学研究所);Stockholm University(斯德哥尔摩大学);University of Minnesota(明尼苏达大学);Arizona State University(亚利桑那州立大学);Zhejiang University(浙江大学);University of Texas at Austin(得克萨斯大学奥斯汀分校);Laboratory for Atmospheric and Space Physics(大气与空间物理实验室);University of Edinburgh(爱丁堡大学);University of Massachusetts Amherst(马萨诸塞大学阿默斯特分校);Johns Hopkins University(约翰斯·霍普金斯大学);Williams College(威廉姆斯学院);University of Virginia(弗吉尼亚大学);Northwestern University(西北大学)
Probing the Cosmic Reionization History with JWST: Gunn-Peterson and Ly$α$ Damping Wing Absorption at $4.5 < z < 13$
The University of Tokyo(东京大学);National Astronomical Observatory of Japan(日本国立天文台);Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo(东京大学宇宙物理数学研究所(WPI))