A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization

Abstract

We examine the impact of baryon-dark matter relative velocities on intergalactic small-scale structure and the 21 cm signal during reionization. Streaming velocities reduced clumping in the intergalactic medium (IGM) on mass scales of $\sim 10^4-10^8$ M${}_{\odot }$. This effect produced a distinct baryon acoustic oscillation (BAO) feature in the 21 cm power spectrum at wave numbers $k\sim 0.1$ h/Mpc, near which forthcoming surveys will be most sensitive. In contrast to the highly uncertain impact of streaming velocities on star formation, the effect on clumping is better constrained because it is set mainly by cosmology and straightforward gas dynamics. We quantify the latter using coupled radiation-hydrodynamic simulations that capture the Jeans scale of pre-reionization gas. The clumping factor of ionized gas is reduced by 5-10\% in regions with RMS streaming velocities. The suppression peaks $\approx 5$ Myr after a region is reionized, but disappears within 200 Myr due to pressure smoothing. We model the corresponding impact on the 21 cm signal and find that the BAO feature is most likely to appear at $\approx$ 10 \% ionization. During this phase, the feature may appear at the 1 \% (5 \%) level at $k\sim 0.1(0.06)$ h/Mpc with an amplitude that varies by a factor of $<10$ across a range of reionization histories. We also provide a model for the signal originating from streaming velocity's impact on ionizing sources, which can vary by 4 orders of magnitude depending on highly uncertain source properties. We find that the clumping signal probably dominates the source one unless Population III star formation in $10^6-10^8$ M${}_{\odot }$ halos contributed significantly to the first 10\% of reionization.

arXiv comment28 pages, 12 figures

References in corpus (74)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• 21-cm cosmology
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• 21-cm Tomography of the Intergalactic Medium at High Redshift
• 21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
• Radiative Transfer in a Clumpy Universe: III. The Nature of Cosmological Ionizing Sources
• Hydrogen Epoch of Reionization Array (HERA)
• The Growth of HII Regions During Reionization
• Relative velocity of dark matter and baryonic fluids and the formation of the first structures
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• The End of the Reionization Epoch Probed by Ly-alpha Emitters at z=6.5 in the Subaru Deep Field
• Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7
• Keck Spectroscopy of Faint 3<z<8 Lyman Break Galaxies:- Evidence for a Declining Fraction of Emission Line Sources In the Redshift Range 6<z<8
• 21 cm fluctuations from inhomogeneous X-ray heating before reionization
• New observations of z~7 galaxies: evidence for a patchy reionization
• Radiative transfer simulations of cosmic reionization I: methodology and initial results
• The observable signature of late heating of the Universe during cosmic reionization
• Can the intergalactic medium cause a rapid drop in Lyman alpha emission at z>6?
• New constraints on Lyman-α opacity with a sample of 62 quasars at z > 5.7
• Constraints on the Star Formation Efficiency of Galaxies During the Epoch of Reionization
• Impact of the Relative Motion between the Dark Matter and Baryons on the First Stars
• The Formation Rates of Population III Stars and Chemical Enrichment of Halos during the Reionization Era
• The Delay of Population III Star Formation by Supersonic Streaming Velocities
• The Opacity of the Intergalactic Medium Measured Along Quasar Sightlines at $z\sim 6$
• Simulating IGM Reionization
• Large Fluctuations in the High-Redshift Metagalactic Ionizing Background
• Suppression and Spatial Variation of Early Galaxies and Minihalos
• Large-scale BAO signatures of the smallest galaxies
• Observing the tail of reionization: neutral islands in the $z=5.5$ Lyman-$\alpha$ Forest
• The impact of the supersonic baryon-dark matter velocity difference on the z~20 21cm background
• The impact of primordial supersonic flows on early structure formation, reionization and the lowest-mass dwarf galaxies
• The Influence of Streaming Velocities on the Formation of the First Stars
• Simulations of Early Baryonic Structure Formation with Stream Velocity: I. Halo Abundance
• SCORCH I: The Galaxy-Halo Connection in the First Billion Years
• The formation of the first cosmic structures and the physics of the z~20 Universe
• The formation of massive black holes in z~30 dark matter haloes with large baryonic streaming velocities
• PAPER-64 Constraints On Reionization II: The Temperature Of The z=8.4 Intergalactic Medium
• Probing reionization with LOFAR using 21-cm redshift space distortions
• A Minimalist Feedback-Regulated Model for Galaxy Formation During the Epoch of Reionization
• Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn
• SILVERRUSH. VI. A simulation of Ly$\alpha$ emitters in the reionization epoch and a comparison with Subaru Hyper Suprime-Cam survey early data
• The effect of relative velocity and density perturbations between baryons and dark matter on the clustering of galaxies
• Implementing the DC Mode in Cosmological Simulations with Supercomoving Variables
• A Moving Frame Algorithm for High Mach Number Hydrodynamics
• Complete history of the observable 21-cm signal from the first stars during the pre-reionization era
• A new light on 21 cm intensity fluctuations from the dark ages
• The Persistence of Population III Star Formation
• Robust Velocity-induced Acoustic Oscillations at Cosmic Dawn
• Self-consistent Semi-analytic Modeling of Feedback During Primordial Star Formation and Reionization
• Early Structure Formation Constraints on the Ultra-Light Axion in the Post-Inflation Scenario
• Modelling the observed luminosity function and clustering evolution of Lyman-$\alpha$ emitters: growing evidence for late reionization
• Streaming velocities and the baryon-acoustic oscillation scale
• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Position-dependent power spectra of the 21-cm signal from the epoch of reionization
• Supersonic Relative Velocity between Dark Matter and Baryons: A Review
• The impact of spin temperature fluctuations on the 21-cm moments
• The Opacity of the Intergalactic Medium During Reionization: Resolving Small-Scale Structure
• Imprints of temperature fluctuations on the $z\sim 5$ Lyman-$\alpha$ forest: a view from radiation-hydrodynamic simulations of reionization
• The Inhomogeneous Ionizing Background Following Reionization
• The 21-cm BAO signature of enriched low-mass galaxies during cosmic reionization
• Self-consistent semi-analytic models of the first stars
• The observable 21cm signal from reionization may be perturbative
• The wedge bias in reionization 21-cm power spectrum measurements
• Impact of Ly$\alpha$ heating on the global 21-cm signal from the Cosmic Dawn
• The Supersonic Project: Shining Light on SIGOs - a New Formation Channel for Globular Clusters
• Redshift-space streaming velocity effects on the Lyman-$\alpha$ forest baryon acoustic oscillation scale
• Small-scale structure and the Lyman-$\alpha$ forest baryon acoustic oscillation feature
• A Constraint on Quasar Clustering at z=5 from a Binary Quasar
• How Density Environment Changes the Influence of the Dark Matter-Baryon Streaming Velocity on the Cosmological Structure Formation
• Reionisation & Cosmic Dawn Astrophysics from the Square Kilometre Array: Impact of Observing Strategies
• Quantifying EoR delay spectrum contamination from diffuse radio emission
• Formation of First Galaxies inside Density Peaks and Voids under the Influence of Dark Matter-Baryon Streaming Velocity, I: Initial Condition and Simulation Scheme

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• An Effective Bias Expansion for 21 cm Cosmology in Redshift Space
• The impact and response of minihalos and the inter-halo medium on cosmic reionization
• The Supersonic Project: The eccentricity and rotational support of SIGOs and DM GHOSts
• A New Probe of the High-z BAO scale: BAO tomography With CMB $\times$ LIM-Nulling Convergence
• An Alcock-Paczynski Test on Reionization Bubbles for Cosmology
• The Supersonic Project: SIGOs, a Proposed Progenitor to Globular Clusters, and their Connections to Gravitational Wave Anisotropies
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