2022ApJ...940L..29Y

Query : 2022ApJ...940L..29Y

2022ApJ...940L..29Y - Astrophys. J., 940, L29 (2022/December-1)

Finding the Missing Baryons in the Intergalactic Medium with Localized Fast Radio Bursts.

YANG K.B., WU Q. and WANG F.Y.

Abstract (from CDS):

The missing baryon problem is one of the major unsolved problems in astronomy. Fast radio bursts (FRBs) are bright millisecond pulses with unknown origins. The dispersion measure of FRBs is defined as the electron column density along the line of sight, and accounts for every ionized baryon. Here we measure the baryon content of the universe using 22 localized FRBs. Unlike previous works that fixed the value of dispersion measure of FRB host galaxies and ignored the inhomogeneities of the intergalactic medium (IGM), we use the probability distributions of dispersion measures contributed by host galaxies and IGM from the state-of-the-art IllustrisTNG simulations. We derive the cosmic baryon density of ${{\rm{\Omega }}}_{b}={0.0490}_{-0.0033}^{+0.0036}$ (1σ), with a precision of 7.0%. This value is dramatically consistent with other measurements, such as the cosmic microwave background and Big Bang nucleosynthesis. Our work supports that the baryons are not missing, but residing in the IGM.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radio transient sources - Intergalactic medium - Baryon density

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 FRB 010724 rB 01 18 06.0 -72 12 19           ~ 94 1
2 FRB 20180916B rB 01 58 00.750 +65 43 00.30           ~ 457 0
3 FRB 200906 rB 03 33 59.08 -14 04 59.5           ~ 43 0
4 FRB 20190614D rB 04 20 18.13 +73 42 24.3           ~ 37 0
5 FRB 20201124A rB 05 07 57.600 +26 11 24.00           ~ 307 0
6 FRB 20181119D rB 05 31 58.6980 +33 08 52.588           ~ 933 0
7 FRB 180301 rB 06 12 43.40 +04 33 44.8           ~ 125 0
8 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
9 FRB 20200120E rB 09 57 56.7 +68 49 32           ~ 219 0
10 NAME FRB 181030.J1054+73 rB 10 33 24.0000 +73 47 24.000           ~ 79 0
11 FRB 190714 rB 12 15 55.1 -13 01 16           ~ 64 0
12 FRB 190523 rB 13 48 15.6 +72 28 11           ~ 109 0
13 FRB 200430 rB 15 18 49.54 +12 22 36.8           ~ 59 0
14 FRB 20190520B rB 16 02 04.270 -11 17 17.32           ~ 211 0
15 FRB 190611 rB 21 22 58.91 -79 23 51.3           ~ 82 0
16 FRB 190102 rB 21 29 39.76 -79 28 32.5           ~ 83 0
17 FRB 191001 rB 21 33 24.373 -54 44 51.40           ~ 64 0
18 FRB 180924 rB 21 44 25.255 -40 54 00.10           ~ 140 0
19 FRB 181112 rB 21 49 23.630 -52 58 15.39           ~ 131 0
20 FRB 20190711A rB 21 57 40.7 -80 21 29           ~ 114 0
21 FRB 190608 rB 22 16 04.74 -07 53 53.6           ~ 102 0
22 FRB 191228 rB 22 57 43.30 -29 35 38.7           ~ 37 0

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