The Cosmic Dispersion Measure in the EAGLE Simulations

Abstract

The dispersion measure (DM) of fast radio bursts (FRBs) provides a unique way to probe ionised baryons in the intergalactic medium (IGM). Cosmological models with different parameters lead to different DM-redshift ($\mathrm{DM}-z$) relations. Additionally, the over/under-dense regions in the IGM and the circumgalactic medium of intervening galaxies lead to scatter around the mean $\mathrm{DM}-z$ relations. We have used the Evolution and Assembly of GaLaxies and their Environments (EAGLE) simulations to measure the mean $\mathrm{DM}-z$ relation and the scatter around it using over one billion lines-of-sight between redshifts $0<z<3$. We investigated two techniques to estimate line-of-sight DM: `pixel scrambling' and `box transformations'. We find that using box transformations (a technique from the literature) causes strong correlations due to repeated replication of structure. Comparing a linear and non-linear model, we find that the non-linear model with cosmological parameters, provides a better fit to the $\mathrm{DM}-z$ relation. The differences between these models are the most significant at low redshifts ($z<0.5$). The scatter around the $\mathrm{DM}-z$ relation is highly asymmetric, especially at low redshift $\left(z<0.5\right)$, and becomes more Gaussian as redshift approaches $z\sim 3$, the limit of this study. The increase in Gaussianity with redshift is indicative of the large scale structures that is better probed with longer lines-of-sight. The minimum simulation size suitable for investigations into the scatter around the $\mathrm{DM}-z$ relation is 100~comoving~Mpc. The $\mathrm{DM}-z$ relation measured in EAGLE is available with an easy-to-use python interface in the open-source FRB redshift estimation package FRUITBAT.

arXiv commentSubmitted to MNRAS. 14 pages, 15 figures, Comments Welcome. Data and model will be released upon being accepted

References in corpus (61)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Galactic Stellar and Substellar Initial Mass Function
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The cosmological simulation code GADGET-2
• The Global Schmidt Law in Star Forming Galaxies
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• High Redshift Galaxies in the Hubble Deep Field. Color Selection and Star Formation History to z=4
• A bright millisecond radio burst of extragalactic origin
• Planck 2013 results. I. Overview of products and scientific results
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• A Population of Fast Radio Bursts at Cosmological Distances
• Where are the Baryons?
• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• A Repeating Fast Radio Burst
• Cosmological simulations of the growth of supermassive black holes and feedback from active galactic nuclei: method and tests
• The Host Galaxy and Redshift of the Repeating Fast Radio Burst FRB 121102
• Chemical enrichment in cosmological, smoothed particle hydrodynamics simulations
• On the relation between the Schmidt and Kennicutt-Schmidt star formation laws and its implications for numerical simulations
• A census of baryons in the Universe from localized fast radio bursts
• Fast Radio Bursts
• Simulating galactic outflows with thermal supernova feedback
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• The Baryon Census in a Multiphase Intergalactic Medium: 30% of the Baryons May Still Be Missing
• On the evolution of the HI column density distribution in cosmological simulations
• Fast Radio Bursts: An Extragalactic Enigma
• The EAGLE simulations of galaxy formation: public release of halo and galaxy catalogues
• FRBCAT: The Fast Radio Burst Catalogue
• A repeating fast radio burst source localised to a nearby spiral galaxy
• A single fast radio burst localized to a massive galaxy at cosmological distance
• The Repeating Fast Radio Burst FRB 121102 as Seen on Milliarcsecond Angular Scales
• Evolution of galaxy stellar masses and star formation rates in the EAGLE simulations
• The Gaseous Environment of High-z Galaxies: Precision Measurements of Neutral Hydrogen in the Circumgalactic Medium of z ~ 2-3 Galaxies in the Keck Baryonic Structure Survey
• The Search for the Missing Baryons at Low Redshift
• A fast radio burst localised to a massive galaxy
• CMasher: Scientific colormaps for making accessible, informative and 'cmashing' plots
• Locating the "missing" baryons with extragalactic dispersion measure estimates
• A Second Source of Repeating Fast Radio Bursts
• Cosmic Dispersion Measure from Gamma-Ray Burst Afterglows: Probing the Reionization History and the Burst Environment
• Cosmological implications of Fast Radio Burst / Gamma-Ray Burst Associations
• Probing the Cosmic Reionization History and Local Environment of Gamma-Ray Bursts through Radio Dispersion
• Host Galaxy Properties and Offset Distributions of Fast Radio Bursts: Implications for their Progenitors
• Probing Galactic Halos with Fast Radio Bursts
• The SUrvey for Pulsars and Extragalactic Radio Bursts II: New FRB discoveries and their follow-up
• MoMaF : The Mock Map Facility
• FRB Energetics and detectability from high redshifts
• The onion universe: all sky lightcone simulations in spherical shells
• Quasars Probing Quasars VI. Excess HI Absorption Within One Proper Mpc of z~2 Quasars
• The distribution of neutral hydrogen around high-redshift galaxies and quasars in the EAGLE simulation
• A Distant Fast Radio Burst Associated to its Host Galaxy with the Very Large Array
• Fast Radio Bursts and cosmological tests
• Limits on precursor and afterglow radio emission from a fast radio burst in a star-forming galaxy
• Disentangling the Cosmic Web Towards FRB 190608
• Large host-galaxy dispersion measure of fast radio bursts
• The abundance and physical properties of O VII and O VIII X-ray absorption systems in the EAGLE simulations
• The Future of Fast Radio Burst Science
• Estimates of Fast Radio Burst Dispersion Measures from Cosmological Simulations
• Fruitbat: A Python Package for Estimating Redshifts of Fast Radio Bursts

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• What it Takes to Measure Reionization with Fast Radio Bursts
• A fast radio burst localized at detection to an edge-on galaxy using very-long-baseline interferometry
• Probing the Circum-Galactic Medium with Fast Radio Bursts: Insights from the CAMELS Simulations
• The Dispersion Measure Contributions of the Cosmic Web
• The dispersion measure and scattering of Fast Radio Bursts: contributions from multi-components, and clues for the intrinsic properties
• Fast radio bursts as probes of feedback from active galactic nuclei
• Dispersion Measures of Fast Radio Bursts through the Epoch of Reionization
• A Search for Low-frequency Radio Pulses from Long Gamma-ray Bursts with the Murchison Widefield Array