The dispersion measure and rotation measure from fast radio burst host galaxies based on the IllustrisTNG50 simulation

Abstract

Fast radio bursts (FRB) will become important cosmological tools, as the number of observed FRBs is increasing rapidly with more surveys being carried out. A large sample of FRBs with dispersion measures (DM) and rotation measures (RM) can be used to study the intergalactic magnetic field. However, the observed DM and RM of FRBs have multiple contributors which must be quantified to obtain the intergalactic medium's (IGM) DM and RM. In this paper, we estimate one such contribution to DM and RM: that of FRB host galaxies. We show how it changes with redshift, galaxy type, and the stellar mass of the galaxies, inclination, and FRB's projected offset. Using the IllustrisTNG50 simulations, we selected 16500 galaxies at redshifts of 0<=z<=2, with stellar masses in the range 9<=log(M*/Msun)<=12. In each galaxy, we calculate the DM and RM contributions of 1000 sightlines, and construct DM and RM probability density functions. We find that the rest frame DM distributions of all galaxies at a given redshift can be fitted by a lognormal function, and the rest frame RM distribution is symmetric around 0 rad m${}^{-2}$, and can be fitted by the combination of a Lorentzian and two Gaussian functions. The parameters of these functions change for different subsets of galaxies with different redshift, stellar mass, inclination, and FRB offset. These changes are due to an increasing $n_e$ with redshift, SFR, and stellar mass, and we find a more ordered B field at lower z compared to higher z, suggested by more galaxies with B field reversals and B fields dominated by random B field at higher z. We estimate the FRB host DM and RM contributions, which can be used in the future to isolate the IGM's contribution from the observed DM and RM of FRBs. We predict that to constrain an ${\sigma }_{\mathrm{RM},\mathrm{IGM}}$ of 2 rad m${}^{-2}$ to 95% confidence level we need to observe 95000 FRBs at z=0.5, but only 9500 FRBs at z=2.

24 pages, 15 figures Accepted for publication in A&A

References in corpus (22)

• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• The direct localization of a fast radio burst and its host
• A census of baryons in the Universe from localized fast radio bursts
• Fast Radio Bursts
• The Evolution of Galaxy Structure over Cosmic Time
• A single fast radio burst localized to a massive galaxy at cosmological distance
• The outer scale of turbulence in the magneto-ionized Galactic interstellar medium
• Magnetism in the spiral galaxy NGC 6946: magnetic arms, depolarization rings, dynamo modes and helical fields
• Evolution of magnetic fields in galaxies and future observational tests with the Square Kilometre Array
• High time resolution and polarisation properties of ASKAP-localised fast radio bursts
• Panic! At the Disks: First Rest-frame Optical Observations of Galaxy Structure at $z>3$ with JWST in the SMACS 0723 Field
• Evolution of Primordial Magnetic Fields from Phase Transitions
• The COSMOS [OII] Survey: Evolution of Electron Density with Star Formation Rate
• Magnetic field strength in cosmic web filaments
• Comparing galaxy formation in semi-analytic models and hydrodynamical simulations
• Propagation of Ultra High Energy Cosmic Rays in Extragalactic Magnetic Fields: A view from cosmological simulations
• Magnetic field evolution in cosmic filaments with LOFAR data
• Fast radio bursts to be detected with the Square Kilometre Array
• The dispersion measure of Fast Radio Bursts host galaxies: estimation from cosmological simulations
• Monte Carlo Physarum Machine: Characteristics of Pattern Formation in Continuous Stochastic Transport Networks