Candidate Population III stellar complex at z=6.629 in the MUSE Deep Lensed Field

Abstract

We discovered a strongly lensed (μ>40) Lya emission at z=6.629 (S/N~18) in the MUSE Deep Lensed Field (MDLF) targeting the Hubble Frontier Field galaxy cluster MACS~J0416. Dedicated lensing simulations imply that the Lya emitting region necessarily crosses the caustic. The arc-like shape of the Lya extends 3 arcsec on the observed plane and is the result of two merged multiple images, each one with a de-lensed Lya luminosity L<~2.8 x 10^(40) erg/s arising from a confined region (< 150 pc effective radius). A spatially unresolved HST counterpart is barely detected at S/N~2 after stacking the near-infrared bands, corresponding to an observed(intrinsic) magnitude m_(1500)>~30.8(>~35.0). The inferred rest-frame Lya equivalent width is EWo > 1120 A if the IGM transmission is T(IGM)<0.5. The low luminosities and the extremely large Lya EWo match the case of a Population~III star complex made of several dozens stars (~ 10^4 Msun) which irradiate a HII region crossing the caustic. While the Lya and stellar continuum are among the faintest ever observed at this redshift, the continuum and the Lya emissions could be affected by differential magnification, possibly biasing the EWo estimate. The aforementioned tentative HST detection tend to favor a large EWo, making such a faint Pop~III candidate a key target for the James Webb Space Telescope and Extremely Large Telescopes.

arXiv comment5 pages, 3 figures and 1 table. Accepted for publication in MNRAS

References in corpus (27)

• The Frontier Fields: Survey Design
• Diffuse Lyman Alpha Emitting Halos: A Generic Property of High Redshift Star Forming Galaxies
• Evidence for PopIII-like stellar populations in the most luminous Lyman-$\alpha$ emitters at the epoch of re-ionisation: spectroscopic confirmation
• Rest-frame ultraviolet-to-optical spectral characteristics of extremely metal-poor and metal-free galaxies
• Weighing simulated galaxy clusters using lensing and X-ray
• Ly Alpha Emitters at z=5.7 in the Subaru Deep Field
• Population III stars: hidden or disappeared ?
• The Frontier Fields Lens Modeling Comparison Project
• Intergalactic Transmission and its Impact on the Lyα Line
• Paving the way for the JWST: witnessing globular cluster formation at z>3
• The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
• SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
• Simulating high-redshift galaxies
• A refined mass distribution of the cluster MACS J0416.1$-$2403 from a new large set of spectroscopic multiply lensed sources
• Massive Star cluster formation under the microscope at z=6
• On the observability of individual Population III stars and their stellar-mass black hole accretion disks through cluster caustic transits
• A Ly-alpha Emitter with an Extremely Large Rest-frame Equivalent Width of ~900A at z=6.5: A Candidate of Population III-dominated Galaxy?
• On the nature and physical conditions of the luminous Lya emitter CR7 and its rest-frame UV components
• An Introductory Review on Cosmic Reionization
• Very Massive Stars in High-Redshift Galaxies
• MUSE Spectroscopic Identifications of Ultra-Faint Emission Line Galaxies with M${}_{\mathrm{UV}}\sim$ -15
• Formation of Massive Population III Galaxies through Photoionization Feedback: A Possible Explanation for CR7
• Primordial star clusters at extreme magnification
• A-PHOT: a new, versatile code for precision aperture photometry
• Boosting Lya and HeII 1640A Line Fluxes from Pop III Galaxies: Stochastic IMF Sampling and Departures from Case-B
• Image simulations for gravitational lensing with SkyLens
• SHARDS Frontier Fields: Physical properties of a low mass Lyman-alpha emitter at z=5.75

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• JWST/NIRCam Observations of Stars and HII Regions in $z\simeq 6-8$ Galaxies: Properties of Star Forming Complexes on 150 pc Scales
• The Ultimately Large Telescope -- what kind of facility do we need to detect Population III stars?
• A needle in a haystack? Catching Pop III stars in the Epoch of Reionization: I. Pop III star forming environments
• The evolution of the size-mass relation at $z$=1-3 derived from the complete Hubble Frontier Fields data set
• A systematic study of the escape of LyC and Ly$\alpha$ photons from star-forming, magnetized turbulent clouds
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• The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) : I. Characterisation of extended Lyman-alpha haloes and spatial offsets
• Cosmic nucleosynthesis: a multi-messenger challenge
• Conditions for detecting lensed Population III galaxies in blind surveys with the James Webb Space Telescope, the Roman Space Telescope and Euclid
• A hint on the metal-free star formation rate density from 21cm-EDGES data
• Constraining Dark Matter properties with the first generation of stars
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• The Size and Pervasiveness of Ly$\alpha$-UV Spatial Offsets in Star-Forming Galaxies at $z\sim 6$
• CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
• Extreme Ionizing Properties of Metal-Poor, Muv ~ -12 Star Complex in the first Gyr
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• A Pristine Star-Forming Complex at z=4.19
• Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman
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• Potential contributions of Pop III and intermediate-mass Pop II stars to cosmic chemical enrichment
• RELICS: Small Lensed $z\ge 5.5$ Galaxies Selected as Potential Lyman Continuum Leakers
• Direct N-body simulations of rotating and extremely massive Population III star clusters
• Out of oxygen: Extremely metal-poor galaxy candidates identified at $2.5<z<6.5$ with deep JADES medium-band imaging