MXDFz4.4: A LyC emitter 250Myr after the epoch of reionization and a first test of Ly-alpha morphology as a tracer of LyC escape at high redshift
Space Telescope Science Institute（太空望远镜科学研究所）；Department of Physics and Astronomy, Johns Hopkins University（约翰斯·霍普金斯大学物理与天文学系）；Aix Marseille Université, CNRS, CNES, LAM (Laboratoire d’Astrophysique de Marseille)（艾克斯-马赛大学、法国国家科学研究中心、法国国家空间研究中心、马赛天体物理实验室）；Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma（俄克拉荷马大学霍默·L·道奇物理与天文学系）；Minnesota Institute for Astrophysics, School of Physics and Astronomy, University of Minnesota（明尼苏达大学物理与天文学院天体物理研究所）；IPAC, Mail Code 314-6, California Institute of Technology（加州理工学院IPAC（314-6邮编））
Ilias Goovaerts, Marc Rafelski, Alexander Beckett, Grecco Oyarzùn, Annalisa Citro, Farhanul Hasan, Kalina V Nedkova, Calum Hawcroft, Anton M Koekemoer, Mitchell… 展开作者
Ilias Goovaerts, Marc Rafelski, Alexander Beckett, Grecco Oyarzùn, Annalisa Citro, Farhanul Hasan, Kalina V Nedkova, Calum Hawcroft, Anton M Koekemoer, Mitchell Revalski, Matthew J Hayes, Claudia Scarlata, Ray A Lucas, Norman A Grogin, David V Stark, Paolo Suin, Nor Pirzkal
备注：
25 pages, 16 figures, 2 tables, 2 appendices. Updated to accepted version (ApJ)
Assessing the contribution of ionizing sources to cosmic reionization is a central goal of extragalactic astrophysics. Understanding and quantifying ionizing escape remains challenging near the epoch of reionization. We present the highest-redshift Lyman continuum (LyC) emitter detected to date, MXDFz4.4 at z=4.442 in the MUSE eXtremely Deep Field, observed only ~0.25Gyr after the end of reionization. A high confidence Ly-alpha line confirms the redshift. LyC flux is detected at 5.3sigma in the F435W filter with a flux of 4.2+/-0.8nJy, corresponding to a flux measurement at 5.2sigma. After correcting for the intrinsic production of LyC photons and the IGM opacity at z=4.44, we derive high escape fractions, ranging from 50 - 100%. We apply established low-redshift tracers of LyC escape and, for the first time at high redshift, promising Ly-alpha morphological tracers such as the halo fraction. SED fitting indicates the presence of a recent burst of star formation; we explore its impact on the production and escape of ionizing photons. Ly-alpha-based tracers of LyC escape reveal a complex scenario in which the recent burst strong influences LyC production and escape, combined with a more evolved stellar population. This interpretation is supported by UV diagnostics, including the star formation rate surface density and sSFR. Our results provide cautious support for the Ly-alpha halo fraction as a LyC escape tracer at high redshift. Considering the burst-driven enhancement in LyC production and escape, we conclude that stochastic star formation in the early Universe likely plays a significant role in the contribution of galaxies to cosmic reionization.
Supernovae Driven Winds Impede Lyman Continuum Escape from Dwarf Galaxies in First 10 Myr
Institute for Advanced Study in Physics（高等研究院物理学院）；Johns Hopkins University（约翰斯·霍普金斯大学）；Stockholm University（斯德哥尔摩大学）；University of Minnesota（明尼苏达大学）；Williams College（威廉姆斯学院）；University of Edinburgh（爱丁堡大学）；University of Michigan（密歇根大学）；Instituto de Astrofísica de Andalucía (CSIC)（安达卢西亚天体物理学研究所（西班牙国家研究委员会））；Arizona State University（亚利桑那州立大学）
The Lyman-Continuum Photon Production Efficiency xi_{ion} of z~4-5 Galaxies from IRAC-based Halpha Measurements: Implications for the Escape Fraction and Cosmic Reionization
MAMMOTH-LyC: Investigating the Role of Galaxy Mergers in a Strong Lyman Continuum Leaker at $z=2.39$
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；School of Astronomy and Space Science, University of Chinese Academy of Sciences (UCAS)（中国科学院大学天文与空间科学学院）；Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学天体物理前沿研究院）；Department of Physics and Astronomy, University of California, Los Angeles（加州大学洛杉矶分校物理与天文学系）；Infrared Processing and Analysis Center, Caltech（加州理工学院红外处理与分析中心）；Centre for Astrophysics and Supercomputing, Swinburne University of Technology（斯威本科技大学天体物理学与超级计算中心）
The Challenge in Illuminating the Invisible: Constraining LyC Escape with Bayesian Modelling and Symbolic Regression
Kavli Institute for Cosmology, University of Cambridge（卡弗里宇宙学研究所，剑桥大学）；Cavendish Laboratory, University of Cambridge（卡文迪许实验室，剑桥大学）；Departamento de Astronomía, Universidad de Chile（智利大学天文学系）；Center for Astrophysics | Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；Department of Physics and Astronomy, University College London（伦敦大学学院物理与天文系）
A Portrait of the Cosmic Reionisation History in the Context of the Early Dark Energy Model
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；University of Chinese Academy of Sciences（中国科学院大学）；Peking University（北京大学）；Swinburne University of Technology（斯威本科技大学）；University of Arizona（亚利桑那大学）
The Ly$α$ and Continuum Origins Survey. III. Investigating the Link between Galaxy Morphology, Merger Properties and LyC Escape
University of Minnesota（明尼苏达大学）；Williams College（威廉姆斯学院）；University of Edinburgh（爱丁堡大学）；Missouri Institute of Technology, University of Missouri-Kansas City（密苏里科技大学，密苏里大学堪萨斯城分校）；Johns Hopkins University（约翰斯·霍普金斯大学）；Space Telescope Science Institute（太空望远镜科学研究所）；Stockholm University（斯德哥尔摩大学）
From THESAN-ZOOM to JWST: Predicting ionizing photon escape and the rise of UV-bright reionization sources
University of Cambridge（剑桥大学）；The University of Texas at Dallas（德克萨斯大学达拉斯分校）；York University（约克大学）；The University of Tokyo（东京大学）；Leibniz-Institut für Astrophysik Potsdam（波茨坦阿纳西斯天文台）；Massachusetts Institute of Technology（麻省理工学院）
Lyman continuum leaker candidates among highly ionised, low-redshift dwarf galaxies selected from HeII
当代研究表明，早期宇宙中星系际介质（IGM）的再电离主要是由恒星形成（原）星系（SFG）实现的。由于观测的限制，我们的知识的起源足够数量的电离莱曼连续（LyC）光子和机制，促进他们的运输到IGM仍然稀疏。因此，最近的努力集中在研究这些高红移物体的局部类似物。我们使用档案光谱SDSS DR 12数据选择低z He II 4686发射器的样本，并将其限制为一组SFG，其发射线诊断对AGN的存在敏感，这是我们唯一的选择标准。我们的最终样本包括18个低质量，低金属含量的矮星系，似乎主要是由恒星源电离。我们发现大的O32比率和[S II]的不足，这为这些星系是LyC发射体（LCEs）提供了强有力的证据。这些天体中至少有40%是具有宇宙学意义的LyC逃逸分数> 10%的候选天体。它们的SFH表现出很强的相似性，几乎所有的星系似乎都包含一个古老的（>1 Gyr）恒星成分，同时也包含一个年轻的两阶段（~ 1000万年和<100万年）恒星爆发，我们推测这可能与LyC逃逸有关。这里提出的紧凑的发射线星系的属性与许多本地LCE中观察到的一致。事实上，我们的样本可能被证明是对相当小的本地LCE目录的扩展，因为我们发现的极端星际介质（ISM）条件被假设为促进LyC泄漏。值得注意的是，我们所有的18个候选人都比大多数已建立的LCE更接近（z<0.1）。如果推断的LyC光子损失是真实的，这表明从He II 46…
Breaking Through the Cosmic Fog: JWST/NIRSpec Constraints on Ionizing Photon Escape in Reionization-Era Galaxies
University of Geneva（日内瓦大学）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；Cosmic Dawn Center (DAWN)（宇宙黎明中心（DAWN））；Max Planck Institut für Astrophysik（马克斯·普朗克天体物理研究所）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；The University of Texas at Austin（德克萨斯大学奥斯汀分校）
Confirmation and Refutation of Lyman Continuum Leakers at $z\sim3$ with JWST NIRSpec/IFU
University of Chinese Academy of Sciences (UCAS)（中国科学院大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学天文与前沿科学研究院）；Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）
Hubble Space Telescope Wide Field Camera 3 Observations of Escaping Lyman Continuum Radiation from Galaxies and Weak AGN at Redshifts $z$$\,\simeq\,$2.3-4.1
A faint M$_{\rm UV} = -14.5$ Lyman-continuum leaker candidate in the epoch of reionization: Unprecedented Ly$α$ properties at z=5.725
INAF – OAS, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna（意大利国家天体物理研究所 - 博洛尼亚天文与空间科学观测站）；IPAC, California Institute of Technology（加州理工学院 IPAC）；Astronomical Institute, Tohoku University（东北大学天文学研究所）；Space Telescope Science Institute (STScI)（太空望远镜科学研究所）；Department of Physics and Astronomy, University of California, Los Angeles（加州大学洛杉矶分校物理与天文学系）；MIT Kavli Institute for Astrophysics and Space Research（麻省理工学院卡弗里天体物理与空间研究研究所）；Max-Planck-Institut für Astrophysik（马克斯·普朗克天体物理研究所）；Univ Lyon, Univ Lyon1, ENS de Lyon, CNRS, Centre de Recherche Astrophy（里昂大学、里昂第一大学、巴黎高等师范学校里昂校区、法国国家科学研究中心、天体物理研究中心）
