Lyman-alpha spectroscopy of extreme [OIII] emitting galaxies at $z\simeq 2-3$: Implications for Ly$\alpha$ visibility and LyC leakage at $z>6$

Abstract

Spectroscopic observations of massive $z>7$ galaxies selected to have extremely large [OIII]+H$\beta$ equivalent width (EW $\sim 1500$ Å) have recently revealed large Ly$\alpha$ detection rates, in contrast to the weak emission seen in the general population. Why these systems are uniquely visible in Ly$\alpha$ at redshifts where the IGM is likely significantly neutral is not clear. With the goal of better understanding these results, we have begun a campaign with MMT and Magellan to measure Ly$\alpha$ in galaxies with similar [OIII]+H$\beta$ EWs at $z\simeq 2-3$. At these redshifts, the IGM is highly ionized, allowing us to clearly disentangle how the Ly$\alpha$ properties depend on the [OIII]+H$\beta$ EW. Here we present Ly$\alpha$ EWs of $49$ galaxies at $z=2.2-3.7$ with intense [OIII]+H$\beta$ line emission (EW $=300-3000$ Å). Our results demonstrate that strong Ly$\alpha$ emission (EW $>20$ Å) becomes more common in galaxies with larger [OIII]+H$\beta$ EW, reflecting a combination of increasingly efficient ionizing photon production and enhanced transmission of Ly$\alpha$. Among the galaxies with the most extreme [OIII]+H$\beta$ emission (EW $\sim 1500$ Å), we find that strong Ly$\alpha$ emission is not ubiquitous, with only $50$ per cent of our population showing Ly$\alpha$ EW $>20$ Å. Our data suggest that the range of Ly$\alpha$ strengths is related to the observed ellipticity, with those systems that appear edge-on or elongated having weaker Ly$\alpha$ emission. We use these results to interpret the anomalous Ly$\alpha$ properties seen in $z>7$ galaxies with extreme [OIII]+H$\beta$ emission and discuss implications for the escape of ionizing radiation from these extreme line emitting galaxies.

arXiv comment13 pages, 8 figure, accepted by MNRAS

References in corpus (124)

• Astropy: A Community Python Package for Astronomy
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• A Simple Model for the Absorption of Starlight by Dust in Galaxies
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• The Structure and Kinematics of the Circum-Galactic Medium from Far-UV Spectra of z~2-3 Galaxies
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• The 3D-HST Survey: Hubble Space Telescope WFC3/G141 grism spectra, redshifts, and emission line measurements for $\sim 100,000$ galaxies
• Statistics of 207 Lya Emitters at a Redshift Near 7: Constraints on Reionization and Galaxy Formation Models
• Galaxy Zoo Green Peas: Discovery of A Class of Compact Extremely Star-Forming Galaxies
• New Constraints on Cosmic Reionization from the 2012 Hubble Ultra Deep Field Campaign
• Model-independent evidence in favor of an end to reionization by z~6
• 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
• Modelling and interpreting spectral energy distributions of galaxies with BEAGLE
• High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data IV: Luminosity Function from the Fall Equatorial Stripe Sampl
• Spectroscopic Confirmation of Three z-Dropout Galaxies at z = 6.844 - 7.213: Demographics of Lyman-Alpha Emission in z ~ 7 Galaxies
• Reionization of the Intergalactic Medium and the Damping Wing of the Gunn-Peterson Trough
• The Universe is Reionizing at z~7: Bayesian Inference of the IGM Neutral Fraction Using Ly$\alpha$ Emission from Galaxies
• Cosmic Reionization after Planck: Could Quasars Do It All?
• Lyman-alpha and CIII] Emission in z=7-9 Galaxies: Accelerated Reionization Around Luminous Star Forming Systems?
• Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
• The Reionization of the Universe by the First Stars and Quasars
• Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
• Luminosity functions of Lyman-alpha emitters at z=6.5, and z=5.7: evidence against reionization at z=6
• Low-redshift Lyman continuum leaking galaxies with high [OIII]/[OII] ratios
• The Keck Lyman Continuum Spectroscopic Survey (KLCS): The Emergent Ionizing Spectrum of Galaxies at $z\sim 3$
• Unusually Large Fluctuations in the Statistics of Galaxy Formation at High Redshift
• Using Lyman-alpha to detect galaxies that leak Lyman continuum
• Evidence for Ubiquitous, High-EW Nebular Emission in z~7 Galaxies: Towards a Clean Measurement of the Specific Star Formation Rate using a Sample of Bright, Magnified Galaxies
• Rapid Reionization by the Oligarchs: The Case for Massive, UV-Bright, Star-Forming Galaxies with High Escape Fractions
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• The Spectral Energy Distributions Of z~8 Galaxies From The IRAC Ultra Deep Fields: Emission Lines, Stellar Masses, And Specific Star Formation Rates At 650 Myr
• Line Emitting Galaxies Beyond a Redshift of 7: An Improved Method for Estimating the Evolving Neutrality of the Intergalactic Medium
• New observations of z~7 galaxies: evidence for a patchy reionization
• A Rapidly Star-forming Galaxy 700 Million Years After the Big Bang at z=7.51
• Keck Spectroscopy of Faint 3<z<7 Lyman Break Galaxies:- II. A High Fraction of Line Emitters at Redshift Six
• Lyman-alpha Emission from a Luminous z=8.68 Galaxy: Implications for Galaxies as Tracers of Cosmic Reionization
• The Origin and Optical Depth of Ionizing Radiation in the "Green Pea" Galaxies
• Ly$\alpha$ emission from Green Peas: the role of circumgalactic gas density, covering, and kinematics
• Inferences on the Timeline of Reionization at z~8 From the KMOS Lens-Amplified Spectroscopic Survey
• Completing the Census of Ly-alpha Emitters at the Reionization Epoch
• A Spectroscopic Redshift Measurement for a Luminous Lyman Break Galaxy at z=7.730 using Keck/MOSFIRE
• Probing reionization with Lyman-alpha emission lines
• Z > 7 galaxies with red Spitzer/IRAC [3.6]-[4.5] colors in the full CANDELS data set: the brightest-known galaxies at Z ~ 7-9 and a probable spectroscopic confirmation at Z=7.48
• Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters
• Very Strong Emission-Line Galaxies in the WISP Survey and Implications for High-Redshift Galaxies
• Observations of the Lyman-$\alpha$ Universe
• Can the intergalactic medium cause a rapid drop in Lyman alpha emission at z>6?
• Spectroscopic detections of CIII]1909 at z~6-7: A new probe of early star forming galaxies and cosmic reionisation
• An Atlas of z=5.7 and z=6.5 Ly alpha Emitters
• Ly$\alpha$ profile, dust, and prediction of Ly$\alpha$ escape fraction in Green Pea Galaxies
• The changing Lya optical depth in the range 6<z<9 from MOSFIRE spectroscopy of Y-dropouts
• The Lyman Continuum Escape Survey: Ionizing Radiation from [O III]-Strong Sources at a Redshift of 3.1
• Ultraviolet spectra of extreme nearby star-forming regions --- approaching a local reference sample for JWST
• Rapid Decline of Lyman-alpha Emission Toward the Reionization Era
• Direct Lyman continuum and Lyman-alpha escape observed at redshift 4
• Escape of about five per cent of Lyman-alpha photons from high-redshift star-forming galaxies
• Constraining the neutral fraction of hydrogen in the IGM at redshift 7.5
• The Ly-alpha Properties of Faint Galaxies at z2-3 with Systemic Redshifts and Velocity Dispersions from Keck-MOSFIRE
• High-precision Photometric Redshifts from Spitzer/IRAC: Extreme [3.6]-[4.5] Colors Identify Galaxies in the Redshift Range z~6.6-6.9
• MMT/MMIRS spectroscopy of $z=1.3-2.4$ extreme [OIII] emitters: Implications for galaxies in the reionization-era
• Accelerated Evolution of Ly$\alpha$ Luminosity Function at $\text{z}\gtrsim 7$ Revealed by the Subaru Ultra-Deep Survey for Ly$\alpha$ Emitters at $\text{z}=7.3$
• The Spectroscopic Properties of Lyα-Emitters at z $\approx$ 2.7: Escaping Gas and Photons from Faint Galaxies
• The Relationship Between Stellar Populations and Lyman Alpha Emission in Lyman Break Galaxies
• Extreme Emission Line Galaxies in CANDELS: Broad-Band Selected, Star-Bursting Dwarf Galaxies at z>1
• The lack of intense Lyman~alpha in ultradeep spectra of z=7 candidates in GOODS-S: imprint of reionization?
• First Results from the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) Survey: Cosmological Reionization at z ~ 7
• Star formation and the interstellar medium in z>6 UV-luminous Lyman-break galaxies
• Spectroscopy of z ~ 7 candidate galaxies: Using Lyman-alpha to constrain the neutral fraction of hydrogen in the high-redshift universe
• The [OIII]$+$H$\beta$ Equivalent Width Distribution at z$\simeq$7: Implications for the Contribution of Galaxies to Reionization
• The LyA-LyC Connection: Evidence for an Enhanced Contribution of UV-faint Galaxies to Cosmic Reionization
• Lyman-alpha emission properties of simulated galaxies: interstellar medium structure and inclination effects
• Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of Reionization III. the Ly$\alpha$ Equivalent-width Distribution and Ionized Structures at $z>7$
• Constraints on the production and escape of ionizing radiation from the emission-line spectra of metal-poor star-forming galaxies
• Gravitational lensing reveals ionizing ultraviolet photons escaping from a distant galaxy
• No missing photons for reionization: moderate ionizing photon escape fractions from the FIRE-2 simulations
• Blueberry galaxies: the lowest mass young starbursts
• The Connection Between Reddening, Gas Covering Fraction, and the Escape of Ionizing Radiation at High Redshift
• The GREATS H$\beta$+[OIII] Luminosity Function and Galaxy Properties at $\mathbf{z}\sim 8$: Walking the Way of JWST
• Binospec: A Wide-field Imaging Spectrograph for the MMT
• Evidence for a Hard Ionizing Spectrum from a z=6.11 Stellar Population
• The Nature of Extreme Emission Line Galaxies at z=1-2: Kinematics and Metallicities from Near-Infrared Spectroscopy
• A spectroscopic search for AGN activity in the reionization era
• Gas Motion Study of Lya Emitters at z~2 Using UV and Optical Spectral Lines
• New Insights on Ly-alpha and Lyman Continuum Radiative Transfer in the Greenest Peas
• High-resolution spectroscopy of a young, low-metallicity optically-thin L=0.02L* star-forming galaxy at z=3.12
• Ionising the Intergalactic Medium by Star Clusters: The first empirical evidence
• The Lyman-alpha luminosity function at z=5.7-6.6 and the steep drop of the faint end: implications for reionization
• First spectroscopic measurements of [OIII] emission from Lyman-alpha selected field galaxies at z ~ 3.1
• The HETDEX Pilot Survey III: The Low Metallicities of High-Redshift Lyman Alpha Galaxies
• Lyman-alpha Emitters During the Early Stages of Reionization
• Physical properties and H-ionizing-photon production rates of extreme nearby star-forming regions
• The Lyman Continuum Escape Survey -- II: Ionizing Radiation as a Function of the [OIII]/[OII] Line Ratio
• Optically-Thin Spatially-Resolved Mg II Emission Maps the Escape of Ionizing Photons
• An HST/WFC3-IR Morphological Survey of Galaxies at z = 1.5-3.6: II. The Relation between Morphology and Gas-Phase Kinematics
• MMT Spectroscopy of Lyman-alpha at z$\simeq$7: Evidence for Accelerated Reionization Around Massive Galaxies
• Diverse properties of Ly-alpha emission in low-redshift compact star-forming galaxies with extremely high [OIII]/[OII] ratios
• A Close Relationship between Lyman Alpha and Mg II in Green Pea Galaxies
• Sizing up Lyman-alpha and Lyman Break Galaxies
• A New Constraint on Reionization from Evolution of the Ly$\alpha$ Luminosity Function at $z\sim 6-7$ Probed by a Deep Census of $z=7.0$ Ly$\alpha$ Emitter Candidates to 0.3 $L^{\ast }$
• The Impact of Scatter in the Galaxy UV Luminosity to Halo Mass Relation on Ly$\alpha$ Visibility During the Epoch of Reionization
• Ly alpha emitting galaxies as early stages in galaxy formation
• LBT observations of compact star-forming galaxies with extremely high [OIII]/[OII] flux ratios: HeI emission-line ratios as diagnostics of Lyman continuum leakage
• Revisiting the Lyman Continuum Escape Crisis: Predictions for z > 6 from Local Galaxies
• Near-Infrared Spectroscopy of Galaxies During Reionization: Measuring CIII] in a Galaxy at $\mathbf{z}=7.5$
• Interpreting the Spitzer/IRAC Colours of 7<z<9 Galaxies: Distinguishing Between Line Emission and Starlight Using ALMA
• On the UV compactness and morphologies of typical Lyman-a emitters from z~2 to z~6
• What is the Physical Origin of Strong Lya Emission? I. Demographics of Lya Emitter Structures
• The Lyman Continuum Escape Survey: Connecting Time-Dependent [OIII] and [OII] Line Emission with Lyman Continuum Escape Fraction in Simulations of Galaxy Formation
• Discovering extremely compact and metal-poor, star-forming dwarf galaxies out to z ~ 0.9 in the VIMOS Ultra-Deep Survey
• Quasar UV luminosity function evolution up to z=8
• Rest-frame UV spectroscopy of extreme [OIII] emitters at $1.3<z<3.7$: Toward a high-redshift UV reference sample for JWST
• Discovery of Extreme [OIII]+H$\beta$ Emitting Galaxies Tracing an Overdensity at z~3.5 in CDF-South
• New Methods for Identifying Lyman Continuum Leakers and Reionization-Epoch Analogues
• Inclination Dependence of Lyman-Alpha Properties in a Turbulent Disk Galaxy
• Searching for z > 6.5 Analogs Near the Peak of Cosmic Star Formation
• Neutral ISM, Lyman-Alpha and Lyman-continuum in the nearby starburst Haro 11
• Extreme emission-line galaxies out to z$\sim$1 in zCOSMOS. I. Sample and characterization of global properties
• Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of Reionization I. Constraining the Ly$\alpha$ Equivalent Width Distribution at 6.0 < $z$ < 7.0
• Confirmation of double peaked Lyman-alpha emission at z=6.593: Witnessing a galaxy directly contributing to the reionisation of the Universe
• Galactic winds and stellar populations in Lyman $\alpha$ emitting galaxies at z ~ 3.1
• Morphological Properties of Lyman Alpha Emitters at Redshift 4.86 in the COSMOS Field: Clumpy Star Formation or Merger?
• CLASH: Extreme Emission Line Galaxies and Their Implication on Selection of High-Redshift Galaxies

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