Boosting the 21 cm forest signals by the clumpy substructures

Abstract

We study the contribution of subhalos to the 21 cm forest signal. The halos can host the substructures and including the effects of those small scale clumps can potentially boost the 21 cm optical depth in favor of detecting the 21 cm forest signals. We estimate the boost factor representing the ratio of the optical depth due to the subhalo contribution and that due to the host halo alone (without subhalos). Even though the optical depth boost factor is negligible for a small host halo with the mass of order $10^5{M}_{\odot }$, the subhalo contribution can enhance the optical depth by an order of magnitude for a host halo of order $10^7{M}_{\odot }$. The resultant 21 cm absorption line abundance which is obtained by integrating over the halo mass range relevant for the 21 cm forest signal can be enhanced by up to of order $10\%$ due to the substructures. The larger boost factor for a larger host halo would be of particular interest for the 21 cm forest detection because the the contribution of the larger host halos to the 21 cm forest signals is smaller due to their higher temperature and less abundance than the smaller host halos. The subhalos hence can well help the larger host halos more important for the signal estimation which, without considering the subhalos, may not give appreciable contribution to 21 cm forest signals.

arXiv comment14 pages, 7 figures

References in corpus (62)

• A Universal Density Profile from Hierarchical Clustering
• Large scale bias and the peak background split
• Profiles of dark haloes: evolution, scatter, and environment
• The Aquarius Project: the subhalos of galactic halos
• Ellipsoidal collapse and an improved model for the number and spatial distribution of dark matter haloes
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• Radiative Transfer in a Clumpy Universe: III. The Nature of Cosmological Ionizing Sources
• The subhalo populations of LCDM dark haloes
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• The Formation and Fragmentation of Primordial Molecular Clouds
• Reionization of the Universe and the Early Production of Metals
• Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys
• On the evolution of the HI column density distribution in cosmological simulations
• The Structural Evolution of Substructure
• Probing the Universe with the Lyman-alpha Forest: I. Hydrodynamics of the Low Density IGM
• Cosmological dark matter annihilations into gamma-rays - a closer look
• Disruption of Dark Matter Substructure: Fact or Fiction?
• The Uchuu Simulations: Data Release 1 and Dark Matter Halo Concentrations
• Quenching and ram pressure stripping of simulated Milky Way satellite galaxies
• X-ray gas density profile of clusters of galaxies from the universal dark matter halo
• Ingredients for 21cm intensity mapping
• The Population of Dark Matter Subhaloes: Mass Functions and Average Mass Loss Rates
• Characterization of subhalo structural properties and implications for dark matter annihilation signals
• HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization
• The one-dimensional power spectrum from the SDSS DR14 Ly$\alpha$ forests
• HI 21cm absorption beyond the epoch of re-ionization
• The Clumpiness of Cold Dark Matter: Implications for the Annihilation Signal
• A unified model for the spatial and mass distribution of subhaloes
• Phat ELVIS: The inevitable effect of the Milky Way's disk on its dark matter subhaloes
• Gas Clumping in Self-Consistent Reionisation Models
• Constraining the radio-loud fraction of quasars at z>5.5
• The 21 cm Forest: Radio Absorption Spectra as Probes of Minihalos Before Reionization
• The LOFAR Two Metre Sky Survey: Deep Fields Data Release 1 -- III. Host-galaxy identifications and value added catalogues
• Photon Consumption in Minihalos during Cosmological Reionization
• Gas density and X-ray surface brightness profiles of clusters of galaxies from dark matter halo potentials: beyond the isothermal beta model
• PAPER-64 Constraints On Reionization II: The Temperature Of The z=8.4 Intergalactic Medium
• Modeling evolution of dark matter substructure and annihilation boost
• The discovery of a highly accreting, radio-loud quasar at z=6.82
• A powerful radio-loud quasar at the end of cosmic reionization
• Exploring reionisation and high-z galaxy observables with recent multi-redshift MWA upper limits on the 21-cm signal
• Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
• The atomic Hydrogen content of the post-reionization Universe
• Modeling dark matter subhalos in a constrained galaxy: Global mass and boosted annihilation profiles
• Modeling the Counts of Faint Radio Loud Quasars: Constraints on the Supermassive Black Hole Population and Predictions for High Redshift
• Evolving parsec-scale radio structure in the most distant blazar known
• Probing small-scale cosmological fluctuations with the 21 cm forest: effects of neutrino mass, running spectral index and warm dark matter
• Parsec-scale properties of the radio brightest jetted AGN at z > 6
• Radio Detection of VIK J2318$-$3113, the Most Distant Radio-Loud Quasar ($z$=6.44)
• The impact of inhomogeneous subgrid clumping on cosmic reionization
• The 21 Centimeter Forest
• The earliest galaxies seen in 21 cm line absorption
• The micro-structure of the intergalactic medium I: the 21cm signature from dynamical minihaloes
• The impact of inhomogeneous subgrid clumping on cosmic reionization II: modelling stochasticity
• Constraints on nature of ultra light dark matter particles with 21cm forest
• 21 cm Forest Constraints on Primordial Black Holes
• The detectability of strong 21 centimetre forest absorbers from the diffuse intergalactic medium in late reionisation models
• The galaxy HI-(sub)halo connection and the HI spatial clustering of local galaxies
• VLBI observations of VIK J2318-3113, a quasar at z = 6.44
• 21cm forest probes on the axion dark matter in the post-inflationary Peccei-Quinn symmetry breaking scenarios
• Probing Oscillons of Ultra-Light Axion-like Particle by 21cm Forest

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• Experimental targets for dark photon dark matter
• Analyzing the 21cm forest with Wavelet Scattering Transform: Insight into non-Gaussian features of the 21cm forest
• Prospects of a statistical detection of the 21-cm forest and its potential to constrain the thermal state of the neutral IGM during reionization
• Impact of dark matter-baryon relative velocity on the 21cm forest
• Survival of Gas in Subhalos and Its Impact on the 21 cm Forest Signals: Insights from Hydrodynamic Simulations