An Ultraluminous Lyman Alpha Emitter with a Blue Wing at z=6.6

Abstract

We report the detection of the most luminous high-redshift Lyman Alpha Emitting galaxy (LAE) yet seen, with log L(Ly alpha) = 43.9 ergs/s. The galaxy -- COSMOS Lyman alpha 1, or COLA1 -- was detected in a search for ultra-luminous LAEs with Hyper Suprime-Cam on the Subaru telescope. It was confirmed to lie at z = 6.593 based on a Lyman alpha line detection obtained from followup spectroscopy with the DEIMOS spectrograph on Keck2. COLA1 is the first very high-redshift LAE to show a multi-component Lyman alpha line profile with a blue wing, which suggests that it could lie in a highly ionized region of the intergalactic medium and could have significant infall. If this interpretation is correct, then ultra-luminous LAEs like COLA1 offer a unique opportunity to determine the properties of the HII regions around these galaxies which will help in understanding the ionization of the z ~ 7 intergalactic medium.

6 pages, 4 figures, 1 table, accepted for publication in ApJ Letters

References in corpus (7)

• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• Line Emitting Galaxies Beyond a Redshift of 7: An Improved Method for Estimating the Evolving Neutrality of the Intergalactic Medium
• Spectroscopic detections of CIII]1909 at z~6-7: A new probe of early star forming galaxies and cosmic reionisation
• Rapid Decline of Lyman-alpha Emission Toward the Reionization Era
• Identification of the brightest Lyα emitters at z=6.6: implications for the evolution of the luminosity function in the re-ionisation era
• Lyman-alpha emitters gone missing: evidence for late reionization?

Cited by in corpus (53)

• Rapid Reionization by the Oligarchs: The Case for Massive, UV-Bright, Star-Forming Galaxies with High Escape Fractions
• Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of Reionization III. the Ly$\alpha$ Equivalent-width Distribution and Ionized Structures at $z>7$
• SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
• The Lyman-alpha luminosity function at z=5.7-6.6 and the steep drop of the faint end: implications for reionization
• The nature of luminous Lyman-alpha emitters at z~2-3: maximal dust-poor starbursts and highly ionising AGN
• Measuring the properties of reionised bubbles with resolved Lyman alpha spectra
• Spectroscopic properties of luminous Lyman-α emitters at $z\approx 6-7$ and comparison to the Lyman-break population
• Probing Cosmic Dawn : Ages and Star Formation Histories of Candidate $z\ge$9 Galaxies
• 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
• The MUSE-Wide Survey: A determination of the Lyman $\alpha$ emitter luminosity function at $3<z<6$
• Three Lyman-alpha emitting galaxies within a quasar proximity zone at z=5.8
• Complex Lyman Alpha Profiles in Redshift 6.6 Ultraluminous Lyman Alpha Emitters
• On the nature and physical conditions of the luminous Lya emitter CR7 and its rest-frame UV components
• Modelling the observed luminosity function and clustering evolution of Lyman-$\alpha$ emitters: growing evidence for late reionization
• Spectroscopic investigation of a reionized galaxy overdensity at z=7
• The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs
• The role of galaxies and AGN in reionising the IGM -- III : IGM-galaxy cross-correlations at z~6 from 8 quasar fields with DEIMOS and MUSE
• Spectral shapes of the Lyman-alpha emission from galaxies: I. blueshifted emission and intrinsic invariance with redshift
• Equivalent widths of Lyman $\alpha$ emitters in MUSE-Wide and MUSE-Deep
• Chasing Lyman alpha-emitting galaxies at z = 8.8
• A High Space Density of Luminous Lyman Alpha Emitters at z~6.5
• Double-peaked Lyman-$\alpha$ emission at z=6.803: a reionisation-era galaxy self-ionising its local HII bubble
• Lyman-alpha transmission properties of the intergalactic medium in the CoDaII simulation
• Constraining galaxy overdensities around three z~6.5 quasars with ALMA and MUSE
• A Faint Flux-Limited Lyman Alpha Emitter Sample at $z\sim 0.3$
• SuperBoRG: Exploration of point sources at $z\sim 8$ in HST parallel fields
• The Ultraluminous Lyman Alpha Luminosity Function at z=6.6
• A Magellan M2FS Spectroscopic Survey of Galaxies at 5.5<z<6.8: Program Overview and a Sample of the Brightest Lyman-alpha Emitters
• The Evolution of the Ultraluminous Ly-alpha Luminosity Function over z=5.7-6.6
• The Magellan M2FS Spectroscopic Survey of High-Redshift Galaxies: A Sample of 260 Ly$\alpha$ Emitters at Redshift $z\approx 5.7$
• SILVERRUSH X: Machine Learning-Aided Selection of $9318$ LAEs at $z=2.2$, $3.3$, $4.9$, $5.7$, $6.6$, and $7.0$ from the HSC SSP and CHORUS Survey Data
• Wave Dark Matter and Ultra Diffuse Galaxies
• Lyman Continuum Galaxy Candidates in COSMOS
• Anatomy of an ionized bubble: NIRCam grism spectroscopy of the $z=6.6$ double-peaked Lyman-$\alpha$ emitter COLA1 and its environment
• Constraining Reionization in Progress at z=5.7 with Lyman-$\alpha$ Emitters: Voids, Peaks, and Cosmic Variance
• Astraeus VIII: A new framework for Lyman-$\alpha$ emitters applied to different reionisation scenarios
• A double-peaked Lyman-$\alpha$ emitter with a strong blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626
• Euclid preparation. The Cosmic Dawn Survey (DAWN) of the Euclid Deep and Auxiliary Fields
• The Impact of Cosmic Variance on Inferences of Global Neutral Fraction Derived from Ly$\alpha$ Luminosity Functions During Reionization
• Can galaxy evolution mimic cosmic reionization?
• RELICS-DP7: Spectroscopic Confirmation of a Dichromatic Primeval Galaxy at z ~ 7
• The MUSE Extremely Deep Field: Classifying the Spectral Shapes of Lya Emitting Galaxies
• Lyman alpha Properties of Simulated Galaxies in Overdense Regions: Effects of Galactic Winds at z > 6
• Understanding the "Feeble Giant" Crater II with tidally stretched Wave Dark Matter
• The Evolution of Lyman Alpha Emitter Line Widths from z=5.7 to z=6.6
• Subaru/HSC z-Broadband Excess Selection of Extreme Emission Line Galaxies at z<1
• Distinguishing AGN from starbursts as the origin of double peaked Lyman-Alpha Emitters in the reionization era
• Modelling LAEs in the Epoch of Reionization with OBELISK
• A unique window into the Epoch of Reionisation: A double-peaked Lyman-$\alpha$ emitter in the proximity zone of a quasar at $z\sim 6.6$
• Constraint on Matter Power Spectrum on $10^6-10^9{M}_{\odot }$ Scales from ${\tau }_e$
• Double-Peaked Ly$\alpha$ Emission during Reionization Requires Nearby Voids and a Favorable Local Ionizing Background
• A resolved Lyman-Alpha profile with doubly peaked emission at z~7
• Unveiling the most luminous Lyman-α emitters in the epoch of reionisation