JWST UNCOVER: The Overabundance of Ultraviolet-luminous Galaxies at $z>9$

Abstract

Over the past year, JWST has uncovered galaxies at record-breaking distances up to $z\sim 13$. The JWST UNCOVER (ultra-deep NIRSpec and NIRcam observations before the epoch of reionization) program has obtained ultra-deep multiwavelength NIRCam imaging of the massive galaxy cluster Abell 2744 over $\sim 45$ arcmin${}^2$ down to $\sim 29.5$ AB mag. Here, we present a robust ultraviolet (UV) luminosity function derived through lensing clusters at $9<z<12$. Using comprehensive end-to-end simulations, we account for all lensing effects and systematic uncertainties in deriving both the amplification factors and the effective survey volume. Our results confirm the intriguing excess of UV-bright galaxies ($M_{UV}<-20$ AB mag) previously reported at $z>9$ in recent JWST studies. In particular, a double power-law (DPL) describes better the bright-end of the luminosity function compared to the classical Schechter form. The number density of these bright galaxies is 10-100 times larger than theoretical predictions and previous findings based on Hubble Space Telescope (HST) observations. Additionally, we measure a star formation rate density of ${\rho }_{\mathrm{SFR}}=10^{-2.64}$ M${}_{\odot }$~yr${}^{-1}$~Mpc${}^{-3}$ at these redshifts, which is 4 to 10 times higher than galaxy formation models that assume a constant star formation efficiency. Future wide-area surveys and accurate modeling of lensing-assisted observations will reliably constrain both the bright and the dim end of the UV luminosity function at $z>9$, which will provide key benchmarks for galaxy formation models.

Published in MNRAS

References in corpus (52)

• Cosmic Star Formation History
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope I. Overview of the instrument and its capabilities
• A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
• Two Remarkably Luminous Galaxy Candidates at $z\approx 10-12$ Revealed by JWST
• The evolution of the galaxy UV luminosity function at redshifts z ~ 8-15 from deep JWST and ground-based near-infrared imaging
• New Determinations of the UV Luminosity Functions from z~9 to z~2 show a remarkable consistency with halo growth and a constant star formation efficiency
• NIRCam Performance on JWST In Flight
• A CEERS Discovery of an Accreting Supermassive Black Hole 570 Myr after the Big Bang: Identifying a Progenitor of Massive z > 6 Quasars
• A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ~ 12 Galaxy in Early JWST CEERS Imaging
• Modelling the nebular emission from primeval to present-day star-forming galaxies
• Hubble Space Telescope Combined Strong and Weak Lensing Analysis of the CLASH Sample: Mass and Magnification Models and Systematic Uncertainties
• The GLASS James Webb Space Telescope Early Release Science Program. I. Survey Design and Release Plans
• Identification and properties of intense star-forming galaxies at redshifts z>10
• Discovery and properties of ultra-high redshift galaxies ($9<z<12$) in the JWST ERO SMACS 0723 Field
• The JWST Early Release Observations
• Revealing Galaxy Candidates out to $z\sim 16$ with JWST Observations of the Lensing Cluster SMACS0723
• The brightest galaxies at Cosmic Dawn
• A lack of evolution in the very bright-end of the galaxy luminosity function from z = 8-10
• Spectroscopic Confirmation of CEERS NIRCam-selected Galaxies at $\mathbf{z}\simeq 8-10$
• Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations
• UV Luminosity Density Results at z>8 from the First JWST/NIRCam Fields: Limitations of Early Data Sets and the Need for Spectroscopy
• The ALMA REBELS Survey: the dust content of $z\sim 7$ Lyman Break Galaxies
• JWST UNCOVER: Extremely red and compact object at$z_{\mathrm{phot}}\simeq 7.6$ triply imaged by Abell 2744
• Astraeus I: The interplay between galaxy formation and reionization
• Early results from GLASS-JWST. XIV: A spectroscopically confirmed protocluster 650 million years after the Big Bang
• Early Results from GLASS-JWST. XIX: A High Density of Bright Galaxies at $z\approx 10$ in the Abell 2744 Region
• UNCOVERing the extended strong lensing structures of Abell 2744 with the deepest JWST imaging
• Stochastic star formation in early galaxies: JWST implications
• On the ages of bright galaxies $\sim 500$ Myr after the Big Bang: insights into star formation activity at $z\gtrsim 15$ with JWST
• Templates for Fitting Photometry of Ultra-High-Redshift Galaxies
• JWST UNCOVER: Discovery of $z>9$ Galaxy Candidates Behind the Lensing Cluster Abell 2744
• The nature of an ultra-faint galaxy in the cosmic Dark Ages seen with JWST
• Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at $z>7$
• Primordial power spectrum in light of JWST observations of high redshift galaxies
• The GLASS-JWST Early Release Science Program. III. Strong lensing model of Abell 2744 and its infalling regions
• New high-precision strong lensing modeling of Abell 2744. Preparing for JWST observations
• ALMA Lensing Cluster Survey: $HST$ and $Spitzer$ Photometry of 33 Lensed Fields Built with CHArGE
• Unscrambling the lensed galaxies in JWST images behind SMACS0723
• Breaking degeneracies in the first galaxies with clustering
• Early Results from GLASS-JWST. I: Confirmation of Lensed $z⩾7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS
• The JWST UNCOVER Treasury survey: Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization
• Schrodinger's Galaxy Candidate: Puzzlingly Luminous at $z\approx 17$, or Dusty/Quenched at $z\approx 5$?
• Are the Newly-Discovered $z\sim 13$ Drop-out Sources Starburst Galaxies or Quasars?
• The Star-forming and Ionizing Properties of Dwarf z~6-9 Galaxies in JADES: Insights on Bursty Star Formation and Ionized Bubble Growth
• Astraeus II: Quantifying the impact of cosmic variance during the Epoch of Reionization
• A Flexible Analytic Model of Cosmic Variance in the First Billion Years
• UNCOVER: Candidate Red Active Galactic Nuclei at 3<z<7 with JWST and ALMA
• JWST NIRSpec spectroscopy of the triply-lensed $z=10.17$ galaxy MACS0647$-$JD
• UNCOVER: A NIRSpec Census of Lensed Galaxies at z=8.50-13.08 Probing a High AGN Fraction and Ionized Bubbles in the Shadow
• The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ~ 8.5-14.5
• JADES: Using NIRCam Photometry to Investigate the Dependence of Stellar Mass Inferences on the IMF in the Early Universe

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