Strong Clustering of Lyman Break Galaxies around Luminous Quasars at z~4

Abstract

In the standard picture of structure formation, the first massive galaxies are expected to form at the highest peaks of the density field, which constitute the cores of massive proto-clusters. Luminous quasars (QSOs) at z~4 are the most strongly clustered population known, and should thus reside in massive dark matter halos surrounded by large overdensities of galaxies, implying a strong QSO-galaxy cross-correlation function. We observed six z~4 QSO fields with VLT/FORS exploiting a novel set of narrow band filters custom designed to select Lyman Break Galaxies (LBGs) in a thin redshift slice of Delta_z~0.3, mitigating the projection effects that have limited the sensitivity of previous searches for galaxies around z>~4 QSOs. We find that LBGs are strongly clustered around QSOs, and present the first measurement of the QSO-LBG cross-correlation function at z~4, on scales of 0.1<~R<~9 Mpc/h (comoving). Assuming a power law form for the cross-correlation function xi=(r/r0_QG)^gamma, we measure r0_QG=8.83^{+1.39}_{-1.51} Mpc/h for a fixed slope of gamma=2.0. This result is in agreement with the expected cross-correlation length deduced from measurements of the QSO and LBG auto-correlation function, and assuming a linear bias model. We also measure a strong auto-correlation of LBGs in our QSO fields finding r0_GG=21.59^{+1.72}_{-1.69} Mpc/h for a fixed slope of gamma=1.5, which is ~4 times larger than the LBG auto-correlation length in random fields, providing further evidence that QSOs reside in overdensities of LBGs. Our results qualitatively support a picture where luminous QSOs inhabit exceptionally massive (M_halo>10^12 M_sun) dark matter halos at z~4.

25 pages, 22 figures, submitted to the ApJ

References in corpus (18)

• EAZY: A Fast, Public Photometric Redshift Code
• A Catalog of Quasar Properties from SDSS DR7
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
• The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe
• Clustering of High Redshift ($z\ge 2.9$) Quasars from the Sloan Digital Sky Survey
• The Direct Detection of Lyman-Continuum Emission from Star-forming Galaxies at z~3
• A massive proto-cluster of galaxies at a redshift of z {\approx} 5.3
• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• Lyman Alpha Emitters at Redshift 5.7 in the COSMOS Field
• 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
• No excess of bright galaxies around the redshift 7.1 quasar ULAS J1120+0641
• A Robust Estimator of the Small-Scale Galaxy Correlation Function
• Large-scale structure of Lyman break galaxies around a radio galaxy protocluster at z~4

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• A unified model for the clustering of quasars and galaxies at $z\approx 6$
• The clustering of X-ray AGN at 0.5 < z < 4.5: host galaxies dictate dark matter halo mass
• A Mixture of LBG Overdensities in the Fields of Three $6<z<7$ Quasars: Implications for the Robustness of Photometric Selection
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• Conditions for direct black hole seed collapse near a radio-loud quasar 1 Gyr after the Big Bang
• An Overdensity of Lyman Break Galaxies Around the Hot Dust-Obscured Galaxy WISE J224607.56$-$052634.9
• APEX at the QSO MUSEUM: molecular gas reservoirs associated with $z\sim$3 quasars and their link to the extended Ly$\alpha$ emission
• Stochastic Processes as the Origin of the Double-Power Law Shape of the Quasar Luminosity Function
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• Connecting the growth of galaxies to the large-scale environment in a massive node of the Cosmic Web at z~3
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• Overdensity of Lyman-Break Galaxy Candidates Around Hot Dust-Obscured Galaxies
• Euclid preparation. Exploring the properties of proto-clusters in the Simulated Euclid Wide Survey
• Quantifying the Impact of Incompleteness on Identifying and Interpreting Galaxy Protocluster Populations with the TNG-Cluster Simulation
• The Diversity of Environments Around Luminous Quasars at Redshift $z\sim 6$
• A cosmic dance at z~3: Detecting the host galaxies of the dual AGN system LBQS0302-0019 and Jil with HAWK-I+GRAAL
• ALMA survey of a massive node of the Cosmic Web at $z\sim 3$. II. A dynamically cold and massive disk galaxy in the proximity of a hyperluminous quasar
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