Dispersion measures of fast radio burst host galaxies derived from IllustrisTNG simulation

Zhang, G. Q.; Yu, Hai; He, Jingliang; Wang, F. Y.

doi:10.48550/arxiv.2007.13935

Cited by 4 publications

(3 citation statements)

References 64 publications

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“…[22,48,49]). On the other hand, it was argued in [73] that the median of DM HG, loc is about 30 ∼ 70 pc cm −3 , while the uncertainty 20 pc cm −3 was frequently used in the literature (e.g. [25,35,36]).…”

Section: Simulating Frbsmentioning

confidence: 99%

Effect of Redshift Distributions of Fast Radio Bursts on Cosmological Constraints

Qiang,

Wei

2021

Preprint

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Nowadays, fast radio bursts (FRBs) have been a promising probe for astronomy and cosmology. However, it is not easy to identify the redshifts of FRBs to date. Thus, no sufficient actual FRBs with identified redshifts can be used to study cosmology currently. In the past years, one has to use the simulated FRBs with " known " redshifts instead. To simulate an FRB, one should randomly assign a redshift to it from a given redshift distribution. But the actual redshift distribution of FRBs is still unknown so far. In the present work, we study the effect of various redshift distributions on cosmological constraints. We find that different redshift distributions lead to different constraining abilities from the simulated FRBs. This result emphasizes the importance to find the actual resdshift distribution of FRBs, and reminds us of the possible bias in the FRB simulations due to the redshift distributions.

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Section: Simulating Frbsmentioning

confidence: 99%

Effect of Redshift Distributions of Fast Radio Bursts on Cosmological Constraints

Qiang,

Wei

2021

Preprint

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“…These large-box simulations are suitable for studying the cosmological distribution of free electrons, but to study the interiors of galaxies, finer-resolution (but smaller-box) runs-such as TNG50 and TNG100-are more suitable. Zhang et al (2020) and Jaroszynski (2020) recently studied the host-galaxy contribution using TNG100.…”

Section: Host-galaxy Contributionmentioning

confidence: 99%

Statistical modelling of the cosmological dispersion measure

Takahashi,

Ioka,

Mori

et al. 2020

Preprint

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We have investigated the basic statistics of the cosmological dispersion measure (DM)such as its mean, variance, probability distribution, angular power spectrum and correlation function-using the state-of-the-art hydrodynamic simulations, IllustrisTNG300, for the fast radio burst (FRB) cosmology. To model the DM statistics, we first measured the free-electron abundance and the power spectrum of its spatial fluctuations. The free-electron power spectrum turns out to be consistent with the dark matter power spectrum at large scales, but it is strongly damped at small scales ( 1Mpc) owing to the stellar and active galactic nucleus feedback. The free-electron power spectrum is well modelled using a scale-dependent bias factor (the ratio of its fluctuation amplitude to that of the dark matter). We provide analytical fitting functions for the free-electron abundance and its bias factor. We next constructed mock sky maps of the DM by performing standard ray-tracing simulations with the TNG300 data. The DM statistics are calculated analytically from the fitting functions of the free-electron distribution, which agree well with the simulation results measured from the mock maps. We have also obtained the probability distribution of source redshift for a given DM, which helps in identifying the host galaxies of FRBs from the measured DMs. The angular two-point correlation function of the DM is described by a simple power law, 𝜉 (𝜃) ≈ 2400(𝜃/deg) −1 pc 2 cm −6 , which we anticipate will be confirmed by future observations when thousands of FRBs are available.

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“…After this article had been submitted, the work on the same subject, also based on IllustrisTNG simulation, but using different methods was published by Zhang et al (2020).…”

Section: A Amentioning

confidence: 99%

FRBs: the Dispersion Measure of Host Galaxies

Jaroszynski

2020

Preprint

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Using the results of the IllustrisTNG simulation we estimate the dispersion measure which may be attributed to halos of so called host galaxies of fast radio bursts sources (FRBs). Our results show that in contradiction to assumptions used to show the applicability of FRBs to cosmological tests, both the dispersion measure and its standard deviation calculated for host galaxies with given stellar mass in general increase with the redshift. The effect is not strong and cosmological tests using FRBs will be possible, but to preserve the level of statistical uncertainty the number of FRBs with known redshift in a sample should be increased by 15%-35% depending on circumstances. We show various statistical characteristics of ionized gas surrounding galaxies, the resulting dispersion measure and their dependence on the host galaxy stellar mass, redshift, and the projected distance of a FRB source from its host center.

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Dispersion measures of fast radio burst host galaxies derived from IllustrisTNG simulation

Cited by 4 publications

References 64 publications

Effect of Redshift Distributions of Fast Radio Bursts on Cosmological Constraints

Effect of Redshift Distributions of Fast Radio Bursts on Cosmological Constraints

Statistical modelling of the cosmological dispersion measure

FRBs: the Dispersion Measure of Host Galaxies

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