The diverse galaxy counts in the environment of high-redshift massive black holes in Horizon-AGN

Abstract

High-redshift quasars are believed to reside in highly biased regions of the Universe, where black hole (BH) growth is sustained by an enhanced number of mergers and by being at the intersection of filaments bringing fresh gas. This assumption should be supported by an enhancement of the number counts of galaxies in the field of view of quasars. While the current observations of quasar environments do not lead to a consensus on a possible excess of galaxies, the future missions JWST, WFIRST, and Euclid will provide new insights on quasar environments, and will substantially increase the number of study-cases. We are in a crucial period, where we need to both understand the current observations and predict how upcoming missions will improve our understanding of BH environments. Using the large-scale simulation Horizon-AGN, we find that statistically the most massive BHs reside in environments with the largest number counts of galaxies. However, we find a large variance in galaxy number counts, and some massive BHs do not show enhanced counts in their neighborhood. Interestingly, some massive BHs have a very close galaxy companion but no further enhancement of the galaxy number counts at larger scales, in agreement with recent observations. We find that AGN feedback in the surrounding galaxies is able to decrease their luminosity and stellar mass, and therefore to make them un-observable when using restrictive galaxy selection criteria. Radiation from the quasars can spread over large distances, which could affect the formation history of surrounding galaxies, but a careful analysis of these processes requires radiative transfer simulations.

published version, 26 pages, 15 figures

References in corpus (26)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The hierarchical formation of the brightest cluster galaxies
• A luminous quasar at a redshift of z = 7.085
• The evolution of massive black hole seeds
• On the onset of galactic winds in quiescent star forming galaxies
• Rapidly star-forming galaxies adjacent to quasars at redshifts exceeding 6
• The JWST Extragalactic Mock Catalog: Modeling galaxy populations from the UV through the near-IR over thirteen billion years of cosmic history
• CANDELS Multiwavelength Catalogs: Source Identification and Photometry in the CANDELS COSMOS Survey Field
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). VI. Black Hole Mass Measurements of Six Quasars at 6.1<z<6.7
• ALMA Observations Show Major Mergers Among the Host Galaxies of Fast-growing, High-redshift Supermassive Black Holes
• LCDM predictions for galaxy protoclusters I: the relation between galaxies, protoclusters and quasars at z~6
• The origin of most massive black holes at high-z: BLUETIDES and the next quasar frontier
• The Euclid mission design
• The Habitat Segregation between Lyman Break Galaxies and Lyman alpha Emitters around a QSO at z~5
• The primordial environment of super massive black holes: large scale galaxy overdensities around $z\sim 6$ QSOs with LBT
• Constraints on the correlation between QSO luminosity and host halo mass from high-redshift quasar clustering
• No overdensity of Lyman Alpha Emitting Galaxies around a quasar at z~5.7
• Mapping the Lyman-Alpha Emission Around a z~6.6 QSO with MUSE: Extended Emission and a Companion at Close Separation
• Large Scale Environment of a $z=6.61$ Luminous Quasar Probed by Ly$\alpha$ Emitters and Lyman Break Galaxies
• No excess of bright galaxies around the redshift 7.1 quasar ULAS J1120+0641
• Chandra X-rays from the redshift 7.54 quasar ULAS J1342+0928
• The descendants of the first quasars in the BlueTides simulation
• Close companions to two high-redshift quasars
• The impact of Lyman-$\alpha$ radiative transfer on large-scale clustering in the Illustris simulation
• Zooming in on supermassive black holes: how resolving their gas cloud host renders their accretion episodic
• Suppression of Low-mass Galaxy Formation around Quasars at z~2-3

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• The Assembly of the First Massive Black Holes
• The origins of massive black holes
• Diagnostics for PopIII galaxies and Direct Collapse Black Holes in the early universe
• The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars
• A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z=6.61 Quasar
• Three Lyman-alpha emitting galaxies within a quasar proximity zone at z=5.8
• An ALMA multi-line survey of the ISM in two quasar host-companion galaxy pairs at $z>6$
• Tracing Black Hole and Galaxy Co-evolution in the Romulus Simulations
• Host galaxies of high-redshift quasars: supermassive black hole growth and feedback
• The web of the Giant: spectroscopic confirmation of a Large Scale Structure around the z=6.31 quasar SDSS J1030+0524
• Shapes and alignments of dark matter haloes and their brightest cluster galaxies in 39 strong lensing clusters
• Galaxy interactions in IllustrisTNG-100, I: The power and limitations of visual identification
• The mass assembly of high-redshift black holes
• The Impact of Dust on the Sizes of Galaxies in the Epoch of Reionization
• Constraining galaxy overdensities around three z~6.5 quasars with ALMA and MUSE
• A quasar-galaxy merger at $z\sim 6.2$: black hole mass and quasar properties from the NIRSpec spectrum
• The need for obscured supermassive black hole growth to explain quasar proximity zones in the epoch of reionization
• The host galaxies of z=7 quasars: predictions from the BlueTides simulation
• A unified model for the clustering of quasars and galaxies at $z\approx 6$
• Measuring the Density Fields around Bright Quasars at $z\sim 6$ with XQR-30 Spectra
• High-redshift SMBHs can grow from stellar-mass seeds via chaotic accretion
• Enhanced star formation in $z\sim 6$ quasar companions
• The hidden satellites of massive galaxies and quasars at high-redshift
• MaNGA galaxy properties -- II. A detailed comparison of observed and simulated spiral galaxy scaling relations
• A Mixture of LBG Overdensities in the Fields of Three $6<z<7$ Quasars: Implications for the Robustness of Photometric Selection
• An Overdensity of Lyman Break Galaxies Around the Hot Dust-Obscured Galaxy WISE J224607.56$-$052634.9
• What do observations tell us about the highest-redshift supermassive black holes?
• Galaxy and Mass Assembly (GAMA): The Weak Environmental Dependence of Quasar Activity at 0.1<z<0.35
• Extreme Primordial Black Holes
• Are there more galaxies than we see around high-$z$ quasars?
• A candidate quadruple AGN system at $z\sim 3$
• The Diversity of Environments Around Luminous Quasars at Redshift $z\sim 6$
• Quasar clustering at redshift 6