TY - JOUR

T1 - Sensitivity reach of gamma-ray measurements for strong cosmological magnetic fields

AU - Korochkin, Alexander

AU - Kalashev, Oleg

AU - Neronov, Andrii

AU - Semikoz, Dmitri

N1 - Funding Information: This work has been supported by the French National Research Agency (ANR) grant ANR-19-CE31-0020 and Russian Science Foundation grant 20-42-09010. Publisher Copyright: © 2021. The American Astronomical Society. All rights reserved. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/1/10

Y1 - 2021/1/10

N2 - A primordial magnetic field with strength in the 1-10 pG range can resolve the tension between different measurements of the Hubble constant and provide an explanation for the excess opacity in the 21 cm line at redshift 15 < z < 20 if it is present during the recombination and reionization epochs. This field can also survive in the voids of the large-scale structure in the present day universe. We study the sensitivity reach of the gamma-ray technique for measurement of such a relatively strong cosmological magnetic field using deep exposure(s) of the nearest hard spectrum blazar(s) with CTA telescopes. We show that the gamma-ray measurement method can sense the primordial magnetic field with a strength of up to 10−11 G. Combination of the cosmic microwave background and gamma-ray constraints can thus sense the full range of possible cosmological magnetic fields to confirm or rule out their relevance to the problem of the origin of cosmic magnetic fields, as well as their influence on recombination and reionization epochs.

AB - A primordial magnetic field with strength in the 1-10 pG range can resolve the tension between different measurements of the Hubble constant and provide an explanation for the excess opacity in the 21 cm line at redshift 15 < z < 20 if it is present during the recombination and reionization epochs. This field can also survive in the voids of the large-scale structure in the present day universe. We study the sensitivity reach of the gamma-ray technique for measurement of such a relatively strong cosmological magnetic field using deep exposure(s) of the nearest hard spectrum blazar(s) with CTA telescopes. We show that the gamma-ray measurement method can sense the primordial magnetic field with a strength of up to 10−11 G. Combination of the cosmic microwave background and gamma-ray constraints can thus sense the full range of possible cosmological magnetic fields to confirm or rule out their relevance to the problem of the origin of cosmic magnetic fields, as well as their influence on recombination and reionization epochs.

UR - http://www.scopus.com/inward/record.url?scp=85100316674&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/e79a8fd6-887f-3dc3-b31b-03861e337c92/

U2 - 10.3847/1538-4357/abc697

DO - 10.3847/1538-4357/abc697

M3 - Article

AN - SCOPUS:85100316674

VL - 906

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 116

ER -