2025A&A...698A.163H

Query : 2025A&A...698A.163H

2025A&A...698A.163H - Astronomy and Astrophysics, volume 698A163 (2025/6-1)

Decoding the cosmological baryonic fluctuations using localized fast radio bursts.

HSU T.-Y., HASHIMOTO T., YANG T.-C., YAMASAKI S., GOTO T., LO J., WANG P.-Y., LIN Y.-W., HO S.C.-C. and RAQUEL B.J.R.

Abstract (from CDS):

Aims. The enigma of the missing baryons poses a prominent and unresolved problem in astronomy. Dispersion measures (DM) serve as a distinctive observable of fast radio bursts (FRBs). They quantify the electron column density along each line of sight and reveal the missing baryons that are described in the Macquart (DM-z) relation. The scatter of this relation is anticipated to be caused by the variation in the cosmic structure. This is not yet statistically confirmed, however. We present statistical evidence that the cosmological baryons fluctuate.
Methods. We measured the foreground galaxy number densities around 14 and 13 localized FRBs with the WISE-PS1-STRM and WISE × SCOS photometric redshift galaxy catalog, respectively. The foreground galaxy number densities were determined through a comparison with measured random apertures with a radius of 1 Mpc.
Results. We found a positive correlation between the excess of DM that is contributed by the medium outside galaxies (DMcosmic) and the foreground galaxy number density. The correlation is strong and statistically significant, with median Pearson coefficients of 0.6 and 0.6 and median p-values of 0.012 and 0.032 for the galaxy catalogs, respectively, as calculated with Monte Carlo simulations.
Conclusions. Our findings indicate that the baryonic matter density outside galaxies exceeds its cosmic average along the line of sight to regions with an excess galaxy density, but there are fewer baryons along the line of sight to low-density regions. This is statistical evidence that the ionized baryons fluctuate cosmologically on a characteristic scale of ≲6 Mpc.

Abstract Copyright: © The Authors 2025

Journal keyword(s): intergalactic medium - large-scale structure of Universe

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 20210603A rB 00 41 05.774 +21 13 34.57           ~ 17 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 FRB 200906 rB 03 33 59.08 -14 04 59.5           ~ 43 0
4 FRB 20220310F rB 08 58 52.920 +73 29 27.00           ~ 25 0
5 FRB 211212 rB 10 30 40.700 +01 40 36.80           ~ 30 0
6 FRB 190714 rB 12 15 55.1 -13 01 16           ~ 64 0
7 FRB 211127 rB 13 19 09.500 -18 49 28.40           ~ 32 0
8 FRB 210320 rB 13 37 16.800 -15 24 37.30           ~ 29 0
9 FRB 190523 rB 13 48 15.6 +72 28 11           ~ 109 0
10 FRB 20220105A rB 13 55 12.94 +22 27 59.4           ~ 19 0
11 FRB 20220418A rB 14 36 25.340 +70 05 45.40           ~ 24 0
12 FRB 200430 rB 15 18 49.54 +12 22 36.8           ~ 59 0
13 FRB 20220920A rB 16 01 01.700 +70 55 07.68           ~ 28 0
14 FRB 20190520B rB 16 02 04.270 -11 17 17.32           ~ 211 0
15 FRB 20221012A rB 18 43 11.690 +70 31 27.15           ~ 25 0
16 FRB 20220914A rB 18 48 13.630 +73 20 12.89           ~ 31 0
17 FRB 20220509G rB 18 50 40.800 +70 14 37.80           ~ 37 0
18 FRB 190102 rB 21 29 39.76 -79 28 32.5           ~ 83 0
19 FRB 191001 rB 21 33 24.373 -54 44 51.40           ~ 64 0
20 FRB 20210410D rB 21 44 20.70 -79 19 05.5           ~ 23 0
21 FRB 190608 rB 22 16 04.74 -07 53 53.6           ~ 102 0
22 FRB 20210117A rB 22 39 55.015 -16 09 05.45           ~ 49 0

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