The Sunburst Arc: Direct Lyman α escape observed in the brightest known lensed galaxy

Abstract

We present rest-frame ultraviolet and optical spectroscopy of the brightest lensed galaxy yet discovered, at redshift z = 2.4. This source reveals a characteristic, triple-peaked Lyman α profile which has been predicted by various theoretical works but to our knowledge has not been unambiguously observed previously. The feature is well fit by a superposition of two components: a double-peak profile emerging from substantial radiative transfer, and a narrow, central component resulting from directly escaping Lyman α photons; but is poorly fit by either component alone. We demonstrate that the feature is unlikely to contain contamination from nearby sources, and that the central peak is unaffected by radiative transfer effects apart from very slight absorption. The feature is detected at signal-to-noise ratios exceeding 80 per pixel at line center, and bears strong resemblance to synthetic profiles predicted by numerical models.

arXiv commentAccepted for publication in Astronomy & Astrophysics. 4 pages, 5 figures

References in corpus (23)

• Planck 2013 results. XXIX. Planck catalogue of Sunyaev-Zeldovich sources
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• Using Lyman-alpha to detect galaxies that leak Lyman continuum
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• Extreme Feedback and the Epoch of Reionization: Clues in the Local Universe
• Lower-Luminosity Galaxies could reionize the Universe: Very Steep Faint-End Slopes to the UV Luminosity Functions at z>=5-8 from the HUDF09 WFC3/IR Observations
• The Origin and Optical Depth of Ionizing Radiation in the "Green Pea" Galaxies
• Lyman Alpha Radiative Transfer in a Multi-Phase Medium
• The spectral evolution of the first galaxies. II. Spectral signatures of Lyman continuum leakage from galaxies in the reionization epoch
• The MagE Spectrograph
• A systematic study of Lyman-Alpha transfer through outflowing shells: Model parameter estimation
• Beamed Lyman Alpha Emission through Outflow-Driven Cavities
• Grid of Lya radiation transfer models for the interpretation of distant galaxies
• Lyman-alpha line and continuum radiative transfer in a clumpy interstellar medium
• P-Cygni Type Lya from Starburst Galaxies
• Linking Ly-alpha and Low-Ionization Transitions at Low Optical Depth
• Do galaxies that leak ionizing photons have extreme outflows?
• Revisiting the Lyman Continuum Escape Crisis: Predictions for z > 6 from Local Galaxies
• From Mirrors to Windows: Lyman-Alpha Radiative Transfer in a Very Clumpy Medium
• Modeling $237$ Lyman-$\alpha$ spectra of the MUSE-Wide survey
• Panchromatic Study of Nearby UV-Bright Starburst Galaxies: Implications for Massive Star Formation and High Redshift Galaxies
• Neutral ISM, Lyman-Alpha and Lyman-continuum in the nearby starburst Haro 11
• MUSE Illuminates Channels for Lyman Continuum Escape in the Halo of SBS 0335-52E

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• Semi-analytic forecasts for JWST -- II. physical properties and scaling relations for galaxies at z = 4-10
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• High star cluster formation efficiency in the strongly lensed Sunburst Lyman-continuum galaxy at z=2.37
• The Lyman Continuum Escape Survey -- II: Ionizing Radiation as a Function of the [OIII]/[OII] Line Ratio
• The Low-Redshift Lyman Continuum Survey. Unveiling the ISM properties of low-$z$ Lyman continuum emitters
• The nature of luminous Lyman-alpha emitters at z~2-3: maximal dust-poor starbursts and highly ionising AGN
• Diverse properties of Ly-alpha emission in low-redshift compact star-forming galaxies with extremely high [OIII]/[OII] ratios
• Puzzling Lyman-alpha line profiles in green pea galaxies
• The X-SHOOTER Lyman-$\alpha$ survey at z=2 (XLS-z2) I: What makes a galaxy a Lyman-$\alpha$ emitter?
• CLASSY III: The Properties of Starburst-Driven Warm Ionized Outflows
• (Re)Solving Reionization with Lyα: How Bright Lyα Emitters account for the $z\approx 2-8$ Cosmic Ionizing Background
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• Clues on the presence and segregation of very massive stars in the Sunburst Lyman-continuum cluster at z=2.37
• The [OIII]$\lambda 5007$ equivalent width distribution at z $\sim 2$: The redshift evolution of the extreme emission line galaxies
• Deciphering Lyman $\alpha$ blob 1 with deep MUSE observations
• The Sunburst Arc with JWST: I. Detection of Wolf-Rayet stars injecting nitrogen into a low-metallicity, $z=2.37$ proto-globular cluster leaking ionizing photons
• The connection between galactic outflows and the escape of ionizing photons
• Lyman alpha and Lyman continuum emission of MgII-selected star-forming galaxies
• The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) : I. Characterisation of extended Lyman-alpha haloes and spatial offsets
• A comparison of UV and optical metallicities in star-forming galaxies
• The Cosmic Telescope that Lenses the Sunburst Arc, PSZ1 G311.65-18.48: Strong Gravitational Lensing model and Source Plane Analysis
• RELICS: Small-scale Star Formation in Lensed Galaxies at $z=6-10$
• The Compact UV Size of Green Pea Galaxies As Local Analogs of High-redshift Ly$\alpha$-Emitters
• Anatomy of a z=6 Lyman-α emitter down to parsec scales: extreme UV slopes, metal-poor regions and possibly leaking star clusters
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• Variations of Observed Lyman-α Spectra Shapes due to the Intergalactic Absorption
• Nature and chemical abundances of a sample of Lyman-$\alpha$ emitter objects at high redshift
• Revisiting the Gas Kinematics in SSA22 Lyman-$\alpha$ Blob 1 with Radiative Transfer Modeling in a Multiphase, Clumpy Medium
• Lyman Continuum Galaxy Candidates in COSMOS
• Ly-alpha emission in low-redshift most metal-deficient compact star-forming galaxies
• Sub-kiloparsec Imaging of Lyman-alpha Emission in a Low Mass, Highly Ionized, Gravitationally Lensed Galaxy at z = 1.84
• Statistical Microlensing Toward Magnified High-Redshift Star Clusters
• Self-Interacting Dark Matter, Core Collapse and the Galaxy-Galaxy Strong Lensing Discrepancy
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• Insights into the reionization epoch from cosmic-noon-CIV emitters in the VANDELS survey
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• Witnessing an extreme, highly efficient galaxy formation mode with resolved Ly$\alpha$ and LyC emission
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• Molecular gas budget and characterization of intermediate-mass star-forming galaxies at $z\approx 2-3$
• Crossing walls and windows: the curious escape of Lyman-$\alpha$ photons through ionised channels
• Linking UV spectral properties of MUSE Ly-alpha emitters at z>3 to Lyman continuum escape
• Understanding the spatial variation of \ion{Mg}{II} and ionizing photon escape in a local LyC leaker
• The Sunburst Arc with JWST: II. Observations of an Eta Carinae Analog at $z=2.37$
• Ionizing Radiation Escape from Low-Redshift Galaxies and Its Connection to Cosmic Reionization
• COOL-LAMPS IV: A Sample of Bright Strongly-Lensed Galaxies at $3<z<4$
• SDSS J1059+4251, a highly magnified z ~ 2.8 star-forming galaxy: ESI observations of the rest-frame UV spectrum
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• COOL-LAMPS. VII. Quantifying Strong-lens Scaling Relations with 177 Cluster-scale Strong Gravitational Lenses in DECaLS
• Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon
• Probing Time-Dependent Dark Energy with the Flux Power Spectrum of the Lyman $\alpha$ Forest
• Unraveling the Lyman Continuum Emission of Ion3: Insights from HST multi-band imaging and X-Shooter spectroscopy
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