Detecting Direct Collapse Black Holes: making the case for CR7

Abstract

We propose that one of the sources in the recently detected system CR7 by Sobral et al. (2015) through spectro-photometric measurements at $z=6.6$ harbors a direct collapse blackhole (DCBH). We argue that the LW radiation field required for direct collapse in source A is provided by sources B and C. By tracing the LW production history and star formation rate over cosmic time for the halo hosting CR7 in a $\Lambda$CDM universe, we demonstrate that a DCBH could have formed at $z\sim 20$. The spectrum of source A is well fit by nebular emission from primordial gas around a BH with MBH $\sim 4.4\times 10^6{\mathrm{M}}_{\odot }$ accreting at a 40 % of the Eddington rate, which strongly supports our interpretation of the data. Combining these lines of evidence, we argue that CR7 might well be the first DCBH candidate.

8 pages, 4 figures. Accepted for publication in MNRAS

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• Intermediate-mass black holes in dwarf galaxies out to redshift $\sim$ 2.4 in the Chandra COSMOS Legacy Survey
• Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes
• Formation of supermassive black hole seeds
• The Evolution of Supermassive Population III Stars
• SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
• On the Maximum Mass of Accreting Primordial Supermassive Stars
• Unveiling the first black holes with JWST: multi-wavelength spectral predictions
• ALMA reveals metals yet no dust within multiple components in CR7
• Cosmological Simulations of Early Blackhole Formation: Halo Mergers, Tidal Disruption, and the Conditions for Direct Collapse
• Baseline Metal Enrichment from Population III Star Formation in Cosmological Volume Simulations
• On the formation of the first quasars
• Observational Signatures of High-Redshift Quasars and Local Relics of Black Hole Seeds
• No evidence for Population III stars or a Direct Collapse Black Hole in the z = 6.6 Lyman-$\alpha$ emitter 'CR7'
• Public Release of A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
• On the nature and physical conditions of the luminous Lya emitter CR7 and its rest-frame UV components
• Exploring HeII$\lambda$1640 emission line properties at $z\sim 2-4$
• Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization
• Gravitational Collapse of Rotating Supermassive Stars including Nuclear Burning Effects
• Evidence for a direct collapse black hole in the Lyman-alpha source CR7
• Exploring the nature of the Lyman-$\alpha$ emitter CR7
• Chasing the observational signatures of seed black holes at z > 7: candidate observability
• Chasing the observational signatures of seed black holes at z > 7: candidate statistics
• Physical properties of the first quasars
• First Light: exploring the Spectra of High-Redshift Galaxies in the Renaissance Simulations
• The nature of the Lyman Alpha Emitter CR7: a persisting puzzle
• Lyman-Werner Escape Fractions from the First Galaxies
• The first supermassive black holes
• Radiative effects during the assembly of direct collapse black holes
• Warm dark matter constraints from high-$z$ Direct Collapse Black Holes using the JWST
• Ab Initio Cosmological Simulations of CR7 as an Active Black Hole
• Metallicity evolution of direct collapse black hole hosts: CR7 as a case study
• The nature of CR7 revealed with MUSE: a young starburst powering extended Lyman-$\alpha$ emission at z=6.6
• Probing the High-Redshift Universe with SPICA: Toward the Epoch of Reionization and Beyond
• Enhanced direct collapse due to Lyman alpha feedback
• Maximally Rotating Supermassive Stars at the Onset of Collapse: The Perturbative Effects of Gas Pressure, Magnetic Fields, Dark Matter and Dark Energy
• A hide-and-seek game: Looking for Population III stars during the Epoch of Reionization through the HeII$\lambda$1640 line
• Radio Power from a Direct-Collapse Black Hole in CR7
• Triggering the formation of direct collapse black holes by their congeners
• GA-NIFS: Dissecting the multiple sub-structures and probing their complex interactions in the \Lyalpha emitter galaxy CR7 at z = 6.6 with JWST/NIRSpec
• Growth problems of stellar black holes in early galaxies
• A Multiply-Imaged z $\sim$ 6.3 Lyman Alpha Emitter candidate behind Abell 2261
• Black hole formation via gas-dynamical processes
• Feedback from intermediate mass black holes on dwarf galaxy morphology at z=2
• How Black Holes Stop Their Host Galaxy from Growing Without AGN Feedback
• Mass transport in galaxy discs limits black hole growth to sub-Eddington rates
• Identification of Candidate Halos Hosting Massive Black Hole Seeds in the $\text{Renaissance}$ Simulations with Support Vector Machines