Can primordial black holes explain the overabundance of bright super-early galaxies?

Abstract

JWST is detecting an excess of high-redshift ($z\gtrsim 10$), bright galaxies challenging most theoretical predictions. To address this issue, we investigate the impact of Primordial Black Holes (PBHs) on the halo mass function and UV luminosity function (LF) of super-early galaxies. We explore two key effects: (i) the enhancement of massive halos abundance due to the compact nature and spatial distribution of PBHs, and (ii) the luminosity boost, characterized by the Eddington ratio ${\lambda }_E$, due to Active Galactic Nuclei (AGN) powered by matter accretion onto PBHs. We build an effective model, calibrated using data at lower redshifts ($z\approx 4-9$), to derive the evolution of the LF including the additional PBH contribution. Via Bayesian analysis, we find that: (a) Although a small fraction ($\log f_{\mathrm{PBH}}\approx -5.42$) of massive ($\log M_{\mathrm{PBH}}/{\mathrm{M}}_{\odot }\approx 8.37$), non-emitting (${\lambda }_E=0$) PBHs can explain the galaxy excess via the halo abundance enhancement, this solution is excluded by CMB $\mu$-distortion constraints on monochromatic PBHs. (b) If PBHs power an AGN emitting at super-Eddington luminosity (${\lambda }_E\approx 10$), the observed LF can be reproduced by a PBH population with characteristic mass $\log M_{\mathrm{PBH}}/{\mathrm{M}}_{\odot }\approx 3.69$ constituting a tiny ($\log f_{\mathrm{PBH}}\approx -8.16$) fraction of the cosmic dark matter content. In the AGN scenario, about 75% of the observed galaxies with ${\mathrm{M}}_{\mathrm{UV}}=-21$ at $z=11$ should host a PBH-powered AGN and typically reside in low mass halos, $M_h=10^{8-9}{\mathrm{M}}_{\odot }$. These predictions can be tested with available and forthcoming JWST spectroscopic data. We note that our analysis considers a lognormal PBH mass function and compares its parameters with monochromatic limits on PBH abundance. Further work is required to relax such limitations.

10 pages, 7 figures, 2 appendices, accepted on A&A

References in corpus (33)

• The NumPy array: a structure for efficient numerical computation
• A population of red candidate massive galaxies ~600 Myr after the Big Bang
• 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
• JADES NIRSpec Spectroscopy of GN-z11: Lyman-$\alpha$ emission and possible enhanced nitrogen abundance in a $z=10.60$ luminous galaxy
• Early results from GLASS-JWST. III: Galaxy candidates at z$\sim$9-15
• Efficient Formation of Massive Galaxies at Cosmic Dawn by Feedback-Free Starbursts
• Identification and properties of intense star-forming galaxies at redshifts z>10
• Cosmic microwave background bounds on primordial black holes including dark matter halo accretion
• Spectroscopic confirmation of two luminous galaxies at $z\sim 14$
• On the stunning abundance of super-early, massive galaxies revealed by JWST
• Revealing Galaxy Candidates out to $z\sim 16$ with JWST Observations of the Lensing Cluster SMACS0723
• The brightest galaxies at Cosmic Dawn
• Reionization Era Bright Emission Line Survey: Selection and Characterization of Luminous Interstellar Medium Reservoirs in the z>6.5 Universe
• Microlensing and dynamical constraints on primordial black hole dark matter with an extended mass function
• Spectroscopic Confirmation of CEERS NIRCam-selected Galaxies at $\mathbf{z}\simeq 8-10$
• The Universe at z>10: Predictions for JWST from the UniverseMachine DR1
• Accelerating early massive galaxy formation with primordial black holes
• The ALMA REBELS Survey: Dust Continuum Detections at z > 6.5
• z~2-9 Galaxies Magnified by the Hubble Frontier Field Clusters II: Luminosity Functions and Constraints on a Faint-End Turnover
• Stochastic star formation in early galaxies: JWST implications
• Primordial Black Holes as Dark Matter: Converting Constraints from Monochromatic to Extended Mass Distributions
• UNCOVER: Illuminating the Early Universe -- JWST/NIRSpec Confirmation of $z>12$ Galaxies
• Clustering and Halo Abundances in Early Dark Energy Cosmological Models
• A luminous and young galaxy at z=12.33 revealed by a JWST/MIRI detection of Hα and [OIII]
• Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter
• EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations
• Identification of a transition from stochastic to secular star formation around $z=9$ with JWST
• Alleviating the need for exponential evolution of JWST galaxies in 10${}^{10}{M}_{\odot }$ haloes at $z>10$ by a modified $\Lambda$CDM power spectrum
• High-redshift JWST Observations and Primordial Non-Gaussianity
• Effects of stellar-mass primordial black holes on first star formation
• Is GN-z11 powered by a super-Eddington massive black hole?

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