2018ApJ...865..147Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.21CET07:27:00

2018ApJ...865..147Z - Astrophys. J., 865, 147-147 (2018/October-1)

The scattering of FRBs by the intergalactic medium: variations, strength, and dependence on dispersion measures.

ZHU W., FENG L.-L. and ZHANG F.

Abstract (from CDS):

The scattering of fast radio bursts (FRBs) by the intergalactic medium (IGM) is explored using cosmological hydrodynamical simulations. We confirm that the scattering by the clumpy IGM has significant line-of-sight variations. We demonstrate that the scattering by the IGM in the voids and walls of the cosmic web is weak, but it can be significantly enhanced by the gas in clusters and filaments. The observed nonmonotonic dependence of the FRB widths on the dispersion measures (DM) cannot determine whether the IGM is an important scattering matter or not. The IGM may dominate the scattering of some FRBs, and the host galaxy dominates others. For the former case, the scattering should be primarily caused by the medium in clusters. A mock sample of 500 sources shows that τIGM∝DMIGM1.6–2.1 at z < 1.5. Assuming that the turbulence follows Kolmogorov scaling, we find that an outer scale of L0 ∼ 5 pc is required to make τIGM ∼ 1-10 ms at ν = 1 GHz. The required L0 ∼ 5 pc can alleviate the tension in the timescales of turbulent heating and cooling but is still ∼4 orders of magnitude lower than the presumed injection scale of turbulence in the IGM. The gap is expected to be effectively shortened if the simulation resolution is further increased. The mechanisms that may further reduce the gap are shortly discussed. If future observations can justify the role of the IGM in the broadening of FRBs, it can help to probe the gas in clusters and filaments.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): intergalactic medium - radio continuum: general - turbulence

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 FRB 010724 rB 01 18 06.0 -72 12 19           ~ 54 0
2 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1904 1
3 FRB 121102 rB 05 32 09.60 +33 05 13.4           ~ 258 0
4 FRB 170107 Rad 11 23 10 -05 01.0           ~ 17 0
5 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4129 2
6 FRB 160102 Rad 22 38 49.0 -30 10 50           ~ 13 0
7 FRB 150807 Rad 22 41 33.75 -53 05 39.9           ~ 44 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018ApJ...865..147Z and select 'bookmark this link' or equivalent in the popup menu


2020.01.21-07:27:00

© Université de Strasbourg/CNRS

    • Contact