The Reionization and Galaxy Evolution Probed by z=7 Lyman Alpha Emitters

Abstract

We made a narrowband NB973 (bandwidth of 200A at 9755A) imaging of the Subaru Deep Field (SDF) and found two z=7 Lyman alpha emitter (LAE) candidates down to NB973=24.9. Carrying out deep follow-up spectroscopy, we identified one of them as a real z=6.96 LAE. This has shown that galaxy formation was in progress just 750 Myr after the Big Bang. Meanwhile, the Lyman alpha line luminosity function of LAE is known to decline from z=5.7 to 6.6 in the SDF. L* at z=6.6 is 40-60% of that at z=5.7. We also confirm that the number density of z=7 LAE is only 17% of the density at z=6.6 comparing the latest SDF LAE samples. This series of significant decreases in LAE density with increasing redshift can be the result of galaxy evolution during these epochs. However, using the UV continuum luminosity functions of LAEs, those of Lyman break galaxies, and a LAE evolution model based on the hierarchical clustering, we find that galaxy evolution alone cannot explain all the decrease in density. This extra density deficit can be interpreted as the attenuation of the Lyman alpha photons from LAEs due to a rapid evolution of neutral hydrogen fraction during the ongoing cosmic reionization at z~6.6-7.

published in Astrophysical Journal

References in corpus (12)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
• The End of the Reionization Epoch Probed by Ly-alpha Emitters at z=6.5 in the Subaru Deep Field
• A galaxy at a redshift z = 6.96
• Studying Reionization with Ly-alpha Emitters
• The Impact of The IGM on High-Redshift Lyman Alpha Emission Lines
• Optical to mid-IR observations of Lyman-alpha galaxies at redshift 5 in the HUDF: a young and low mass population
• A Luminosity Function of Lyman Alpha Emitting Galaxies at Redshift 4.5
• Rapid Evolution in the Most Luminous Galaxies During the First 900 Million Years
• Lyman Alpha Emitters in the Hierarchically Clustering Galaxy Formation
• Luminosity Functions of Lyman-Break Galaxies at z~4 and 5 in the Subaru Deep Field

Cited by in corpus (150)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Statistics of 207 Lya Emitters at a Redshift Near 7: Constraints on Reionization and Galaxy Formation Models
• New Constraints on Cosmic Reionization from the 2012 Hubble Ultra Deep Field Campaign
• Reionization and Cosmology with 21 cm Fluctuations
• Keck Spectroscopy of Faint 3<z<7 Lyman Break Galaxies: - I. New constraints on cosmic reionisation from the luminosity and redshift-dependent fraction of Lyman-alpha emission
• Reionization after Planck: The Derived Growth of the Cosmic Ionizing Emissivity now matches the Growth of the Galaxy UV Luminosity Density
• Revealing the High-Redshift Star Formation Rate with Gamma-Ray Bursts
• Spectroscopic confirmation of z~7 LBGs: probing the earliest galaxies and the epoch of reionization
• Large Area Survey for z=7 Galaxies in SDF and GOODS-N: Implications for Galaxy Formation and Cosmic Reionization
• Full-Data Results of Hubble Frontier Fields: UV Luminosity Functions at $z\sim 6-10$ and a Consistent Picture of Cosmic Reionization
• New observations of z~7 galaxies: evidence for a patchy reionization
• On the redshift-evolution of the Lyman-alpha escape fraction and the dust content of galaxies
• Keck Spectroscopy of Faint 3<z<7 Lyman Break Galaxies:- II. A High Fraction of Line Emitters at Redshift Six
• The Star Formation Rate in the Reionization Era as Indicated by Gamma-ray Bursts
• Cosmogenic Neutrinos: parameter space and detectabilty from PeV to ZeV
• Completing the Census of Ly-alpha Emitters at the Reionization Epoch
• GRB 080913 at redshift 6.7
• The Contribution of High Redshift Galaxies to Cosmic Reionization: New Results from Deep WFC3 Imaging of the Hubble Ultra Deep Field
• On the physical properties of z~6-8 galaxies
• Hubble Frontier Fields First Complete Cluster Data: Faint Galaxies at $z\sim 5-10$ for UV Luminosity Functions and Cosmic Reionization
• Accelerated Evolution of Ly$\alpha$ Luminosity Function at $\text{z}\gtrsim 7$ Revealed by the Subaru Ultra-Deep Survey for Ly$\alpha$ Emitters at $\text{z}=7.3$
• Diffuse Lyman-alpha Halos around Galaxies at z=2.2-6.6: Implications for Galaxy Formation and Cosmic Reionization
• The Darkest Hour Before Dawn: Contributions to Cosmic Reionization from Dark Matter Annihilation and Decay
• First Results from the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) Survey: Cosmological Reionization at z ~ 7
• Spectroscopy of z ~ 7 candidate galaxies: Using Lyman-alpha to constrain the neutral fraction of hydrogen in the high-redshift universe
• Discovery of a Giant Lya Emitter Near the Reionization Epoch
• What is the physical origin of strong Lya emission? II. Gas Kinematics and Distribution of Lya Emitters
• Radiative Transfer Modeling of Lyman Alpha Emitters. I. Statistics of Spectra and Luminosity
• Reionization and high-redshift galaxies: the view from quasar absorption lines
• Cosmic reionization after Planck
• SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
• Gamma Ray Bursts
• The ASTRID Simulation: Galaxy Formation and Reionization
• Spectroscopic confirmation of a galaxy at redshift z=8.6
• The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies
• Gas Motion Study of Lya Emitters at z~2 Using UV and Optical Spectral Lines
• Population III.1 and III.2 gamma-Ray Bursts: Constraints on the event rate for future radio and X-ray surveys
• ALMA Observation of 158 micron [CII] Line and Dust Continuum of a z=7 Normally Star-forming Galaxy in the Epoch of Reionization
• On the Use of Ly-alpha Emitters as Probes of Reionization
• Metal-Free Gas Supply at the Edge of Reionization: Late-Epoch Population III Star Formation
• Intensity Mapping of Lyman-alpha Emission During the Epoch of Reionization
• The escape fraction of ionizing photons from high redshift galaxies from data-constrained reionization models
• Lyman-alpha Emitters During the Early Stages of Reionization
• The Obelisk simulation: galaxies contribute more than AGN to HI reionization of protoclusters
• Cosmic reionization after Planck II: contribution from quasars
• Lyα Emission from High Redshift Sources in COSMOS
• Discovery of a protocluster at z~6
• Lyman Alpha Emitters at z=7 in the Subaru/XMM-Newton Deep Survey Field: Photometric Candidates and Luminosity Function
• The UDF05 Follow-up of the HUDF: II. Constraints on Reionization from z-dropout Galaxies
• Gamma Ray Bursts in the Swift-Fermi Era
• Effect of the intergalactic environment on the observability of Ly-alpha emitters during reionization
• Semi-analytic forecasts for JWST -- IV. Implications for cosmic reionization and LyC escape fraction
• The Aurora radiation-hydrodynamical simulations of reionization: calibration and first results
• A New Constraint on Reionization from Evolution of the Ly$\alpha$ Luminosity Function at $z\sim 6-7$ Probed by a Deep Census of $z=7.0$ Ly$\alpha$ Emitter Candidates to 0.3 $L^{\ast }$
• A Large Number of z > 6 Galaxies around a QSO at z = 6.43: Evidence for a Protocluster?
• Seeing Through the Trough: Outflows and the Detectability of Lyman Alpha Emission from the First Galaxies
• The Luminosity Function of Lyman alpha Emitters at Redshift z=7.7
• Escape of Lyman-alpha and continuum photons from star-forming galaxies
• Spatially adaptive radiation-hydrodynamical simulations of galaxy formation during cosmological reionization
• ART^2 : Coupling Lyman-alpha Line and Multi-wavelength Continuum Radiative Transfer
• Probing $\sim L_{\ast }$ Lyman-break Galaxies at $z\approx 7$ in GOODS-South with WFC3 on HST
• A physical model for the evolving UV luminosity function of high redshift galaxies and their contribution to the cosmic reionization
• Galactic Winds and Extended Lya Emission from the Host Galaxies of High Column Density QSO Absorption Systems
• A photometric survey for Lyalpha-HeII dual emitters: Searching for Population III stars in high-redshift galaxies
• Cosmological Tests Using GRBs, the Star Formation Rate and Possible Abundance Evolution
• An Empirical Study of the Relationship between Lyα and UV selected Galaxies: Do Theorists and Observers `Select' the Same Objects?
• Introducing SPHINX-MHD: The Impact of Primordial Magnetic Fields on the First Galaxies, Reionization, and the Global 21cm Signal
• The Large-Scale Observational Signatures of Low-Mass Galaxies During Reionization
• What is the Physical Origin of Strong Lya Emission? I. Demographics of Lya Emitter Structures
• Large Scale Environment of a $z=6.61$ Luminous Quasar Probed by Ly$\alpha$ Emitters and Lyman Break Galaxies
• Lyman Alpha Emitters in Hierarchical Galaxy Formation II. UV Continuum Luminosity Function and Equivalent Width Distribution
• Limits on the luminosity function of Ly-alpha emitters at z = 7.7
• High-redshift star formation rate up to z~8.3 derived from gamma-ray bursts and influence of background cosmology
• Spectroscopic observation of Ly$\alpha$ emitters at z~7.7 and implications on re-ionization
• Probing cosmic star formation up to z = 9.4 with GRBs
• Spectroscopy of luminous z>7 galaxy candidates and sources of contamination in z>7 galaxy searches
• Physical and morphological properties of z~3 LBGs: dependence on Lyalpha line emission
• Peering into cosmic reionization: the Ly$\alpha$ visibility evolution from galaxies at $z$ = 4.5-8.5 with JWST
• The ionizing background at the end of overlap
• Spectroscopically Confirmed Lyman-Alpha Emitters from Redshift 5 to 7 Behind Ten Galaxy Cluster Lenses
• Winds of change: reionization by starburst galaxies
• The Stellar Mass, Star Formation Rate and Dark Matter Halo Properties of LAEs at $z\sim 2$
• First Spectroscopic Confirmations of z ~ 7.0 Lya Emitting Galaxies in the LAGER Survey
• Search for [CII] emission in z=6.5-11 star-forming galaxies
• Searching for z~7.7 Lyman Alpha Emitters in the COSMOS Field with NEWFIRM
• Studying reionization with the next generation of Ly-alpha emitter surveys
• Observing the first galaxies
• High Redshift Gamma-Ray Bursts: Observational Signatures of Superconducting Cosmic Strings?
• Estimating Luminosity Function Constraints from High-Redshift Galaxy Surveys
• Observational constraints on key-parameters of cosmic reionisation history
• Physical Properties of UDF12 Galaxies in Cosmological simulations
• Predictions for Ultra-Deep Radio Counts of Star-Forming Galaxies
• The Building the Bridge survey for z=3 Ly-alpha emitting galaxies II: Completion of the survey
• The reanalysis of spectra of GRB 080913 to estimate the neutral fraction of the IGM at a redshift of 6.7
• First stars and the extragalactic background light: How recent gamma-ray observations constrain the early universe
• Predictions for the 21cm-galaxy cross-power spectrum observable with LOFAR and Subaru
• Bright Lyman-alpha Emitters at z~9: constraints on the luminosity function from HiZELS
• Stochastic Gravitational Wave Background from Neutron Star r-mode Instability Revisited
• CLARA's view on the escape fraction of Lyman-Alpha photons in high redshift galaxies
• Stellar Populations of Lyman-alpha Emitters at z=4.86: A Comparison to $z\sim 5$ LBGs
• Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of Reionization I. Constraining the Ly$\alpha$ Equivalent Width Distribution at 6.0 < $z$ < 7.0
• A Census of the LyC Photons that Form the UV Background During Reionization
• The effects of primordial non-Gaussianity on the cosmological reionization
• First study of reionization in the Planck 2015 normalized closed $\Lambda$CDM inflation model
• Predictions for measuring the 21-cm multi-frequency angular power spectrum using SKA-Low
• The Goldilocks problem of the quasar contribution to reionization
• The Stellar Population and Star Formation Rates of z~1.5-1.6 [O II] Emitting Galaxies Selected from Narrow-Band Emission-Line Surveys
• Nature and chemical abundances of a sample of Lyman-$\alpha$ emitter objects at high redshift
• Retrieving cosmological information from small-scale CMB foregrounds II. The kinetic Sunyaev Zel'dovich effect
• A Physical Model of Lyman Alpha Emitters
• Ly alpha emissters at z=6.5 in the SSA22 field: An area more neutral or void at the end of the reionization epoch
• Understanding the redshift evolution of the luminosity functions of Lyman-alpha emitters
• Can the 21 cm signal probe Population III and II star formation?
• Constraints on Star Forming Galaxies at z> 6.5 from HAWK-I Y-band Imaging of GOODS-South
• Gamma Ray Bursts and their links with Supernovae and Cosmology
• Grisms Developed for FOCAS
• Search for z~7 Ly-alpha emitters with Suprime-Cam at the Subaru Telescope
• The Size and Pervasiveness of Ly$\alpha$-UV Spatial Offsets in Star-Forming Galaxies at $z\sim 6$
• Astraeus VI: Hierarchical assembly of AGN and their large-scale effect during the Epoch of Reionization
• Search for z~6.96 Ly-alpha emitters with Magellan/IMACS in the COSMOS field
• Constraining Reionization in Progress at z=5.7 with Lyman-$\alpha$ Emitters: Voids, Peaks, and Cosmic Variance
• First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
• Constraining the epoch of reionization from the observed properties of the high-z Universe
• Reionization of the Milky Way, M31, and their satellites I: reionization history and star formation
• Low-Metallicity Star Formation in High-Redshift Galaxies at z~8
• Gamma-ray burst cosmology: Hubble diagram and star formation history
• Influence of ~7 keV sterile neutrino dark matter on the process of reionization
• The THESAN project: Lyman-alpha emitter luminosity function calibration
• Using Artificial Neural Networks to Constrain the Halo Baryon Fraction during Reionization
• Modeling Reionization in a Bursty Universe
• Cosmic histories of star formation and reionization: An analysis with a power-law approximation
• Reionization and feedback in overdense regions at high redshift
• The First Billion Years project: gamma-ray bursts at z>5
• GTC Observations of an Overdense Region of LAEs at z=6.5
• Design for the First Narrowband Filter for the Dark Energy Camera: Optimizing the LAGER Survey for z ~ 7 Galaxies
• Constraining the reionization history with CMB and spectroscopic observations
• A Search for z=7.3 Lyα Emitters behind Gravitationally Lensing Clusters
• The duration of reionization constrains the ionizing sources
• The Taiwan ECDFS Near-Infrared Survey: Very Bright End of the Luminosity Function at z>7
• Spitzer Space Telescope Constraint on the Stellar Mass of a z = 6.96 Lyman Alpha Emitter
• Probing the Long Gamma-Ray Burst Progenitor by Lyman-alpha Emission of Host Galaxies
• Subaru FOCAS survey of z=7-7.1 Lyα emitters: a test for z >~ 7 Lyα photometric luminosity functions
• Probing Patchy Reionization with the Void Probability Function of Lyman-$\alpha$ Emitters
• The Cosmic Chemical Evolution as seen by the Brightest Events in the Universe
• Clues to the nature of dark matter from first galaxies
• Subaru Studies of the Cosmic Dawn
• Constraints on the Epoch of Reionization with Roman Space Telescope and the Void Probability Function of Lyman-Alpha Emitters
• The haloes that reionized the Universe
• The HiZELS/UKIRT large area survey for bright Lyman-alpha emitters at z~9
• Luminosities, Masses and Star Formation Rates of Galaxies at High Redshift (IAU279 conference proceedings)