The Distribution and Evolution of Quasar Proximity Zone Sizes

Abstract

In this paper, we study the sizes of quasar proximity zones with synthetic quasar absorption spectra obtained by post-processing a Cosmic Reionization On Computers (CROC) simulation. CROC simulations have both relatively large box sizes and high spacial resolution, allowing us to resolve Lyman limit systems, which are crucial for modeling the quasar absorption spectra. We find that before reionization most quasar proximity zone sizes grow steadily for $\sim 10$ Myr, while after reionization they grow rapidly but only for $\sim 0.1$ Myr. We also find a slow growth of $R_{\mathrm{obs}}$ with decreasing turn-on redshift. In addition, we find that $\sim 1-2\%$ of old quasars ($30$ Myr old) display extremely small proximity zone sizes ($<1$ proper Mpc), of which the vast majority are due to the occurrence of a damped Ly$\alpha$ absorber (DLA) or a Lyman limit system (LLS) along the line of sight. These DLAs and LLSs are contaminated with metal, which offers a way to distinguish them from the normal proximity zones of young quasars.

arXiv comment18 pages, 15 figures, comments welcome!

References in corpus (47)

• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• A Multi-Code Analysis Toolkit for Astrophysical Simulation Data
• Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar
• Damped Lyman alpha Systems
• Modelling Primordial Gas in Numerical Cosmology
• Model-independent evidence in favor of an end to reionization by z~6
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• Effects of Baryons and Dissipation on the Matter Power Spectrum
• P3M-SPH simulations of the Lyman-alpha Forest
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Multi--dimensional Cosmological Radiative Transfer with a Variable Eddington Tensor Formalism
• Constrained Simulations of the Real Universe: II. Observational Signatures of Intergalactic Gas in the Local Supercluster Region
• The first ultraviolet quasar stacked spectrum at z=2.4 from WFC3
• Cosmological Radiative Transfer Codes Comparison Project I: The Static Density Field Tests
• New constraints on Lyman-α opacity with a sample of 62 quasars at z > 5.7
• Cosmic Reionization On Computers I. Design and Calibration of Simulations
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• Characterizing Circumgalactic Gas around Massive Ellipticals at z~0.4 - II. Physical Properties and Elemental Abundances
• The nature and evolution of the highly ionized near-zones in the absorption spectra of z~6 quasars
• The Opacity of the Intergalactic Medium Measured Along Quasar Sightlines at $z\sim 6$
• Quasar Strömgren Spheres Before Cosmological Reionization
• The Earliest Luminous Sources and the Damping Wing of the Gunn-Peterson Trough
• Measurements of the z ~ 6 Intergalactic Medium Optical Depth and Transmission Spikes Using a New z > 6.3 Quasar Sample
• Probing the Evolution of IR Properties of z~6 Quasars: Spitzer Observations
• Voigt Profile Fitting to Quasar Absorption Lines: An Analytic Approximation to the Voigt-Hjerting Function
• Secondary ionization and heating by fast electrons
• Quasar Proximity Zones and Patchy Reionization
• Ionization near-zones associated with quasars at z ~ 6
• The physical properties of z>2 Lyman limit systems: new constraints for feedback and accretion models
• Detecting and Characterizing Young Quasars I: Systemic Redshifts and Proximity Zones Measurements
• Evidence for Low Radiative Efficiency or Highly Obscured Growth of $z>7$ Quasars
• The Role of Galaxies and AGN in Reionising the IGM - I: Keck Spectroscopy of 5 < z < 7 Galaxies in the QSO Field J1148+5251
• First Spectroscopic Study of a Young Quasar
• Time-dependent behaviour of quasar proximity zones at $z\sim 6$
• Supermassive Black Holes in the Early Universe
• A metal-poor damped Ly-alpha system at redshift 6.4
• Quasar Ionization Front Lyα Emission in an Inhomogeneous Intergalactic Medium
• Probing the end of reionization with the near-zones of z > 6 QSOs
• Relativistic Ionization Fronts
• Evidence for Short $\sim 1$ Myr Lifetimes from the He II Proximity Zones of $z\sim 4$ Quasars
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z~6
• The Mean Absorption Line Spectra of a Selection of Luminous z~6 Lyman Break Galaxies
• Connecting cosmological accretion to strong Lyman-alpha absorbers
• Cosmic Reionization On Computers: The Galaxy-Halo Connection between $5\le z\le 10$
• The Role of Quasar Radiative Feedback on Galaxy Formation during Cosmic Reionization
• Subaru medium-resolution spectra of a QSO at z=6.62: Three reionization tests

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• Chronicling the reionization history at $6\lesssim z\lesssim 7$ with emergent quasar damping wings
• The need for obscured supermassive black hole growth to explain quasar proximity zones in the epoch of reionization
• Measuring the Density Fields around Bright Quasars at $z\sim 6$ with XQR-30 Spectra
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• Recovering Density Fields inside Quasar Proximity Zones at $z\sim 6$
• Probing Large Scale Ionizing Background Fluctuation with Lyman $\alpha$ Forest and Galaxy Cross-correlation at z=2.4
• A comparison of numerical methods for computing the reionization of intergalacitc hydrogen and helium by a central radiating source
• High-redshift AGN population in radiation-hydrodynamics simulations
• Reconstructing Large-scale Temperature Profiles around $z\sim 6$ Quasars
• Revisiting secondary CMB distortions due to kinetic Sunyaev-Zel'dovich effect from quasar bubbles before reionization
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