Searching for Islands of Reionization: A Potential Ionized Bubble Powered by a Spectroscopic Overdensity at z = 8.7
Rebecca L. Larson, Steven L. Finkelstein, Taylor A. Hutchison, Casey Papovich, Micaela B. Bagley, Mark E. Dickinson, Sofía Rojas-Ruiz, Henry C. Ferguson, Intae … 展开作者
Rebecca L. Larson, Steven L. Finkelstein, Taylor A. Hutchison, Casey Papovich, Micaela B. Bagley, Mark E. Dickinson, Sofía Rojas-Ruiz, Henry C. Ferguson, Intae Jung, Mauro Giavalisco, A. Grazian, Laura Pentericci, Sandro Tacchella
We present the results from a spectroscopic survey using the MOSFIRE near-infrared spectrograph on the 10m Keck telescope to search for Ly$α$ emission from candidate galaxies at z ~9-10 in four of the CANDELS fields (GOODS-N, EGS, UDS, and COSMOS). We observed 11 target galaxies, detecting Ly$α$ from one object in ~8.1 hours of integration, at z = 8.665 +/- 0.001 with an integrated signal-to-noise > 7. This galaxy is in the CANDELS Extended Groth Strip (EGS) field, and lies physically close (3.5 physical Mpc [pMpc]) to another confirmed galaxy in this field with Ly$α$ detected at z=8.683 (Zitrin et al. 2015). The detection of Ly$α$ suggests the existence of large (~1 pMpc) ionized bubbles fairly early in the reionization process. We explore the ionizing output needed to create bubbles of this size at this epoch and find that such a bubble requires more than the ionizing power provided by the full expected population of galaxies (by integrating the UV Luminosity Function down to M_UV = -13). The Ly$α$ we detect would be able to escape the predominantly-neutral intergalactic medium at this epoch if our galaxy is inhabiting an overdensity, which would be consistent with the photometric overdensity previously identified in this region by Finkelstein et al. 2021. This implies that the CANDELS EGS field is hosting an overdensity at z = 8.7 which is powering one (or more) ionized bubbles, a hypothesis that will be imminently testable with forthcoming James Webb Space Telescope observations in this field.
We present the prospects of extracting information about the Epoch of Reionization by identifying the remaining neutral regions, referred to as islands, in tomographic observations of the redshifted 21-cm signal. Using simulated data sets we show that at late times the 21-cm power spectrum is fairly insensitive to the details of the reionization process but that the properties of the neutral islands can distinguish between different reionization scenarios. We compare the properties of these islands with those of ionized bubbles. At equivalent volume filling fractions, neutral islands tend to b…
Reionization and the ISM/Stellar Origins with JWST and ALMA (RIOJA): The core of the highest redshift galaxy overdensity at $z = 7.88$ confirmed by NIRSpec/JWST
First-star imprints in a metal-poor galaxy overdensity near the end of reionization
University of Copenhagen（哥本哈根大学）；Niels Bohr Institute, University of Copenhagen（哥本哈大学尼尔斯·玻尔研究所）；Tsinghua University（清华大学）；Chinese Academy of Sciences（中国科学院）；INAF - Osservatorio Astronomico di Trieste（意大利国家天体物理研究所的里雅斯特天文台）；IFPU - Institute for Fundamental Physics of the Universe（宇宙基础物理研究所）；Institute of Science and Technology Austria (ISTA)（奥地利科学与科技大学）；National Astronomical Observatory of Japan (NAOJ)（日本国立天文台）；Camosun College（卡莫森学院）；INAF/Osservatorio Astrofisico di Arcetri（意大利国家天体物理研究所阿切尔蒂天文台）；University of Texas at Austin（德克萨斯大学奥斯汀分校）；Heidelberg University（海德堡大学）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；University of Arizona（亚利桑那大学）；Korea Institute for Advanced Study（韩国高等研究院）；University of Michigan（密歇根大学）
A growing population of metal absorbers are observed at z>5, many showing strong evolution in incidence approaching the epoch of hydrogen reionization. Follow-up surveys examining fields around these metals have resulted in galaxy detections but the direct physical relationship between the detected galaxies and absorbers is unclear. Upcoming observations will illuminate this galaxy-absorber relationship, but the theoretical framework for interpreting these observations is lacking. To inform future z>5 studies, we define the expected relationship between metals and galaxies using the Technicolo…
We present the Obelisk project, a cosmological radiation-hydrodynamics simulation following the assembly and reionization of a protocluster progenitor during the first two billions of years from the big bang, down to $z = 3.5$. The simulation resolves haloes down to the atomic cooling limit, and tracks the contribution of different sources of ionization: stars, active galactic nuclei, and collisions. The Obelisk project is designed specifically to study the coevolution of high redshift galaxies and quasars in an environment favouring black hole growth. In this paper, we establish the relative …
SILVERRUSH. VII. Subaru/HSC Identifications of 42 Protocluster Candidates at z~6-7 with the Spectroscopic Redshifts up to z=6.574: Implications for Cosmic Reionization
JADES: A Prominent Galaxy Overdensity Candidate within the First 500 Myr
Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）；DARK, Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所 DARK 中心）；Department of Physics, University of Oxford（牛津大学物理系）；Cosmic Dawn Center (DAWN)（宇宙黎明中心 (DAWN)）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, University of Hertfordshire（赫特福德大学物理、天文与数学系天体物理研究中心）；Kavli Institute for Cosmology, University of Cambridge（剑桥大学卡弗里宇宙学研究所）；Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）
The Lumina Project: Morphology of Ionized Bubbles and Neutral Islands
Massachusetts Institute of Technology（麻省理工学院）；The University of Texas at Dallas（德克萨斯大学达拉斯分校）；Philipps Universität Marburg（马尔堡菲利普斯大学）；Max Planck Institute for Astrophysics（马克斯·普朗克天体物理研究所）；York University（约克大学）
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Discovers an Overdensity around a Metal Absorption-selected Galaxy at $z\sim5.5$
Recent observations have found that many $z\sim 6$ quasar fields lack galaxies. This unexpected lack of galaxies may potentially be explained by quasar radiation feedback. In this paper I present a suite of 3D radiative transfer cosmological simulations of quasar fields. I find that quasar radiation suppresses star formation in low mass galaxies, mainly by photo-dissociating their molecular hydrogen. Photo-heating also plays a role, but only after $\sim$100 Myr. However, galaxies which already have stellar mass above $10^5 M_\odot$ when the quasar turns on will not be suppressed significantly.…
We present evidence that a region of high effective Ly$α$ optical depth at $z\sim5.7$ is associated with an underdense region at the tail end of cosmic reionization. We carried out a survey of Lyman-break Galaxies (LBGs) using Subaru Hyper Suprime-Cam in the field of the $z=5.98$ quasar J0148+0600, whose spectrum presents an unusually long ($\sim160 \mathrm{cMpc}$) and opaque ($τ\gtrsim7$) Ly$α$ trough at $5.5\le z\le 5.9$. LBG candidates were selected to lie within the redshift range of the trough, and the projected number densities were measured within 90~cMpc of the quasar sightline. The re…
A long (110 cMpc/$h$) and deep absorption trough in the Ly$α$ forest has been observed extending down to redshift 5.5 in the spectrum of ULAS J0148+0600. Although no Ly$α$ transmission is detected, Ly$β$ spikes are present which has led to claims that the gas along this trough must be ionized. Using high resolution cosmological radiative transfer simulations in large volumes, we show that in a scenario where reionization ends late ($z \sim 5.2$), our simulations can reproduce troughs as long as observed. In this model, we find that the troughs are caused by islands of neutral hydrogen. Small i…
Reionization-era galaxies tend to exhibit weak Ly$α$ emission, likely reflecting attenuation from an increasingly neutral IGM. Recent observations have begun to reveal exceptions to this picture, with strong Ly$α$ emission now known in four of the most massive z=7$-$9 galaxies in the CANDELS fields, all of which also exhibit intense [OIII]$+$H$β$ emission (EW$>$800 $\mathrm{\mathring{A}}$). To better understand why Ly$α$ is anonymously strong in a subset of massive z$\simeq$7$-$9 galaxies, we have initiated an MMT/Binospec survey targeting a larger sample (N=22) of similarly luminous ($\simeq$…
Upcoming galaxy surveys and 21-cm experiments targeting high redshifts $z\gtrsim 6$ are highly complementary probes of galaxy formation and reionization. However, in order to expedite the large volume simulations relevant for 21-cm observations, many models of galaxies within reionization codes are entirely subgrid and/or rely on halo abundances only. In this work, we explore the extent to which resolving and modeling individual galaxy formation histories affects predictions both for the galaxy populations detectable by upcoming surveys and the signatures of reionization accessible to upcoming…
EIGER VIII: First stars signatures in the connection between OI absorption and Galaxies in the Epoch of Reionization
North Carolina State University（北卡罗来纳州立大学）；MIT Kavli Institute for Astrophysics and Space Research（麻省理工学院卡弗里天体物理学与空间研究研究所）；Institute of Science and Technology Austria (ISTA)（奥地利科学技术研究所）；National Astronomical Observatory of Japan (NAOJ)（日本国立天文台）；ETH Zürich（苏黎世联邦理工学院）
Cosmic Dawn II (CoDa II) is a new, fully-coupled radiation-hydrodynamics simulation of cosmic reionization and galaxy formation and their mutual impact, to redshift $z < 6$. With $4096^3$ particles and cells in a 94 Mpc box, it is large enough to model global reionization and its feedback on galaxy formation while resolving all haloes above $10^8$ M$_{\odot}$. Using the same hybrid CPU-GPU code RAMSES-CUDATON as CoDa I in Ocvirk et al. (2016), CoDa II modified and re-calibrated the subgrid star-formation algorithm, making reionization end earlier, at $z \gtrsim 6$, thereby better matching the …
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the CGM Metal Enrichment at z > 6 Using the JWST and VLT
We report the identification of radio (0.144-3 GHz), mid-IR, far-IR, and sub-mm (24-850$μ$m) emission at the position of one of 41 UV-bright (M$_\mathrm{UV}^{}\lesssim-21.25$) $z\simeq6.6-6.9$ Lyman-break galaxy candidates in the 1.5 deg$^2$ COSMOS field. This source, COS-87259, exhibits a sharp flux discontinuity (factor $>$3) between two narrow/intermediate bands at 9450 and 9700 Angstroms and is undetected in all nine bands blueward of 9600 Angstroms, as expected from a Lyman-alpha break at $z\simeq6.8$. The full multi-wavelength (X-ray through radio) data of COS-87529 can be self-consisten…
Deep JWST spectroscopy of galaxies in a candidate ionized bubble at $z = 8.7$: probing reionization at pMpc scales with Ly$α$ emission
University of Cambridge（剑桥大学）；University of Arizona（亚利桑那大学）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；University of California, Santa Barbara（加州大学圣塔芭芭拉分校）；University of Vienna（维也纳大学）
Galaxy Protoclusters as Drivers of Cosmic Reionization: II. Te-Based Metallicities of Lyman-α Emitters
Pontificia Universidad Católica de Chile（智利天主教 Pontificia 大学）；Las Campanas Observatory, Carnegie Science（拉斯坎帕纳斯天文台，卡内基科学）；University of California Santa Barbara（加州大学圣塔芭芭拉分校）；Instituto de Astrofísica de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales（迭戈·波特莱斯大学工程与科学学院天体物理研究所）；Texas A&M University（德克萨斯农工大学）；George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University（德克萨斯农工大学乔治·P和辛西娅·伍兹基础物理与天文学研究所）；Caltech/IPAC（加州理工学院/IPAC）；Institute for Cosmic Ray Research, The University of Tokyo（东京大学宇宙射线研究所）；Space Telescope Science Institute（太空望远镜科学研究所）
The Extended Mapping Obscuration to Reionization with ALMA (Ex-MORA) Survey: A Molecular Gas Line Search
Pontificia Universidad Católica de Chile（智利天主教 Pontificia 大学）；Millennium Nucleus for Galaxies (MINGAL)（银河系千年核团（MINGAL））；Las Campanas Observatory, Carnegie Institution of Washington（卡内基华盛顿机构拉斯坎帕纳斯天文台）；Universidad Diego Portales（迭戈·波特莱斯大学）；University of Washington（华盛顿大学）；University of California, Santa Barbara（加州大学圣巴巴拉分校）；Cosmic Dawn Center (DAWN)（宇宙黎明中心（DAWN））；Imperial College London（伦敦帝国理工学院）；International Centre for Radio Astronomy Research (ICRAR), University of Western Australia（西澳大利亚大学国际射电天文研究中心（ICRAR））；Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM（巴黎萨克雷大学、巴黎西岱大学、CEA、CNRS、AIM）；Space Telescope Science Institute（太空望远镜科学研究所）
本研究通过 ALMA 的 Ex-MORA 巡天开展 $0.5<z<5$ 范围的分子气体线搜寻，探测到 52 个星系，揭示了不同演化阶段星系的气体性质，证明广域线搜寻可有效获取大质量气体储库。
All the Massive Galaxy Overdensities during Reionization: JWST Rest-Frame Optical Selection Reveals Young, Chemically Evolved Galaxies Embedded in Dense, Neutral Gas at z > 5
Cosmic Dawn Center (DAWN)（宇宙黎明中心）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；DTU Space, Technical University of Denmark（丹麦技术大学空间科学中心）；Institute of Science and Technology Austria (ISTA)（奥地利科学技术研究院）；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所）；Department of Astronomy, University of Geneva（日内瓦大学天文系）；National Astronomical Observatory of Japan（日本国立天文台）；INAF/Osservatorio Astronomico di Roma（意大利国家天体物理研究所罗马天文台）
Low Ly$α$ Visibility in Galaxy Overdensities: Reionization Topology and Neutral-Fraction Ceilings from DIVER over $4.8<z<11$
Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）；Institute for Astronomy, University of Edinburgh（爱丁堡大学天体物理研究所）；Department of Physics & Astronomy, University of California, Riverside（加州大学河滨分校物理与天文学系）；Department of Astronomy, Tsinghua University（清华大学天文系）；Department of Astronomy, Westlake University（西湖大学天文系）；School of Earth and Space Exploration, Arizona State University（亚利桑那州立大学地球与太空探索学院）；Department of Physics, University of Oxford（牛津大学物理系）
We explore the expected galaxy environments of CIV absorbers at z>5 using the Technicolor Dawn simulations. These simulations reproduce the observed history of reionization, the z~6 galaxy stellar mass function, the Ly$α$ forest transmission at z>5, and the SiIV column density distribution (CDD) at z~5.5. Nonetheless, the CIV CDD remains underproduced. Comparison with observed CII/SiII equivalent width ratios and the CII line incidence suggests that a low carbon yield accounts for some, but not all, of the CIV discrepancy. Alternatively, a density-bounded escape scenario could harden the metag…
Using the CoDa II simulation, we study the Ly$α$ transmissivity of the intergalactic medium (IGM) during reionization. At $z>6$, a typical galaxy without an active galactic nucleus fails to form a proximity zone around itself due to the overdensity of the surrounding IGM. The gravitational infall motion in the IGM makes the resonance absorption extend to the red side of Ly$α$, suppressing the transmission up to roughly the circular velocity of the galaxy. In some sight lines, an optically thin blob generated by a supernova in a neighboring galaxy results in a peak feature, which can be mistake…
Our understanding of reionization has advanced considerably over the past decade, with several results now demonstrating that the IGM transitioned from substantially neutral at $z=7$ to largely reionized at $z=6$. However, little remains known about the sizes of ionized bubbles at $z\gtrsim7$ as well as the galaxy overdensities which drive their growth. Fortunately, rest-UV spectroscopic observations offer a pathway towards characterizing these ionized bubbles thanks to the resonant nature of Lyman-alpha photons. In a previous work, we presented Ly$α$ detections from three closely-separated Ly…
