High-z Quasars in the R_h=ct Universe

Abstract

One cannot understand the early appearance of 10^9 solar-mass black holes without invoking anomalously high accretion rates or the creation of exotically massive seeds, neither of which is seen in the local Universe. Recent observations have compounded this problem by demonstrating that most, if not all, of the high-z quasars appear to be accreting at the Eddington limit. In the context of LCDM, the only viable alternative now appears to be the assemblage of supermassive black holes via mergers, as long as the seeds started forming at redshifts >40, but ceased being created by z~20-30. In this paper, we show that, whereas the high-z quasars may be difficult to explain within the framework of the standard model, they can instead be interpreted much more sensibly in the context of the R_h=ct Universe. In this cosmology, 5-20 solar-mass seeds produced after the onset of re-ionization (at z<15) could have easily grown to M>10^9 solar masses by z> 6, merely by accreting at the standard Eddington rate.

Accepted for publication in the Astrophysical Journal

References in corpus (8)

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• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
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Cited by in corpus (51)

• Black hole formation in the early universe
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• The Gamma-Ray Burst Hubble Diagram and Its Cosmological Implications
• A Comparative Analysis of the Supernova Legacy Survey Sample with ΛCDM and the $R_{\mathrm{h}}=ct$ Universe
• Cosmological Tests Using GRBs, the Star Formation Rate and Possible Abundance Evolution
• A comparison of the R_h=ct and LCDM cosmologies using the Cosmic Distance Duality Relation
• Physical Basis for the Symmetries in the Friedmann-Robertson-Walker Metric
• The Premature Formation of High Redshift Galaxies
• The HII Galaxy Hubble Diagram Strongly Favors $R_{\mathrm{h}}=ct$ over $\Lambda$CDM
• The Cosmic Timeline Implied by the JWST High-redshift Galaxies
• Cosmological test using the Hubble diagram of high-z quasars
• Model-independent Test of the Cosmic Distance Duality Relation
• On Recent Claims Concerning the R_h=ct Universe
• Matter Matters: Unphysical Properties of the Rh = ct Universe
• Power law cosmology model comparison with CMB scale information
• Reconstruction of the HII Galaxy Hubble Diagram using Gaussian Processes
• Alcock-Paczynski Test with Model-independent BAO Data
• Cosmological test with the QSO Hubble diagram
• A Comparison of Cosmological Models Using Strong Gravitational Lensing Galaxies
• The High-z Quasar Hubble Diagram
• The Epoch of Reionization in the R_h=ct Universe
• Testing the Distance-Duality Relation in the $R_h=ct$ Universe
• Impact of a locally measured H_0 on the interpretation of cosmic chronometer data
• The Cosmic Equation of State
• Definitive Test of the R_h=ct Universe Using Redshift Drift
• Model Selection with Strong-lensing Systems
• Testing Cosmological Models with Type Ic Super Luminous Supernovae
• A Distance-Deviation Consistency and Model-Independent Method to Test the Cosmic Distance-Duality Relation
• Cosmological Tests With Strong Gravitational Lenses using Gaussian Processes
• The ALHAMBRA survey: Discovery of a faint QSO at z = 5.41
• The Age-Redshift Relationship of Old Passive Galaxies
• Cosmological Tests with the FSRQ Gamma-ray Luminosity Function
• Reconciling the cosmic age problem in the R_h=ct Universe
• A Two-point Diagnostic for the HII Galaxy Hubble Diagram
• Thermodynamics of the R_h=ct Universe: A Simplification of Cosmic Entropy
• Cosmological Tests with the Joint Lightcurve Analysis
• Local probes strongly favor $\Lambda$CDM against power-law and $R_h=ct$ universe
• A Cosmological Solution to the Impossibly Early Galaxy Problem
• Constancy of the Cluster Gas Mass Fraction in the R_h=ct Universe
• Testing the $R_{\mathrm{h}}=ct$ Universe Jointly with the Redshift-dependent Expansion rate and Angular-diameter and Luminosity Distances
• A Resolution of the Monopole Problem in the R_h=ct Universe
• A comparison of the R_h=ct and LCDM cosmologies based on the observed halo mass function
• Reassessing Dust's Role in Forming the CMB
• Unseen Progenitors of Luminous High-z Quasars in the R_h=ct Universe
• J1342+0928 Supports the Timeline in the R_h=ct Cosmology
• Model Selection based on the Angular-Diameter Distance to the Compact Structure in Radio Quasars
• Cosmological Perturbations without Inflation
• A Pop III generated dust screen at z~16
• Tantalizing New Physics from the Cosmic Purview
• Holographic dark energy in a coasting cosmology
• Cosmological test using the high-redshift detection rate of FSRQs with the Square Kilometer Array