Direct Lyman continuum and Lyman-alpha escape observed at redshift 4

Abstract

We report on the serendipitous discovery of a z=4.0, M1500=-22.20 star-forming galaxy (Ion3) showing copious Lyman continuum (LyC) leakage (~60% escaping), a remarkable multiple peaked Lya emission, and significant Lya radiation directly emerging at the resonance frequency. This is the highest redshift confirmed LyC emitter in which the ionising and Lya radiation possibly share a common ionised cavity (with N_HI<10^17.2 cm^-2). Ion3 is spatially resolved, it shows clear stellar winds signatures like the P-Cygni NV1240 profile, and has blue ultraviolet continuum (β= -2.5 +/- 0.25, F_λ~ λ^β) with weak low-ionisation interstellar metal lines. Deep VLT/HAWKI Ks and Spitzer/IRAC 3.6um and 4.5um imaging show a clear photometric signature of the Halpha line with equivalent width of 1000A rest-frame emerging over a flat continuum (Ks-4.5um ~ 0). From the SED fitting we derive a stellar mass of 1.5x10^9 Msun, SFR of 140 Msun/yr and age of ~10 Myr, with a low dust extinction, E(B-V)< 0.1, placing the source in the starburst region of the SFR-M^* plane. Ion3 shows similar properties of another LyC emitter previously discovered (z=3.21, Ion2, Vanzella et al. 2016). Ion3 (and Ion2) represents ideal high-redshift reference cases to guide the search for reionising sources at z>6.5 with JWST.

Accepted for publication in MNRAS. 5 pages, 4 figures, 1 table

References in corpus (11)

• The Effects of Stellar Rotation. II. A Comprehensive Set of Starburst99 Models
• Using Lyman-alpha to detect galaxies that leak Lyman continuum
• J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons
• Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters
• Q1549-C25: A Clean Source of Lyman-Continuum Emission at $z=3.15$
• The Sunburst Arc: Direct Lyman α escape observed in the brightest known lensed galaxy
• Linking Ly-alpha and Low-Ionization Transitions at Low Optical Depth
• Peering through the holes: the far UV color of star-forming galaxies at z~3-4 and the escaping fraction of ionizing radiation
• Do galaxies that leak ionizing photons have extreme outflows?
• Kinematics and Optical Depth in the Green Peas: Suppressed Superwinds in Candidate LyC Emitters
• Ultra-deep Ks-band Imaging of the Hubble Frontier Fields

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