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Constraint on intergalactic magnetic field from Fermi/LAT observations of the "pair echo" of GRB 221009A

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arxiv 2306.07672 v1 pith:TBZISDMQ submitted 2023-06-13 astro-ph.HE

Ie.Vovk , A.Korochkin , A.Neronov , D.Semikoz This is my paper · ORCID
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keywords igmfechofermipairboundcorrelationdetectionfield
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abstract

Delayed "pair echo" signal from interactions of very-high-energy gamma rays in the intergalactic medium can be used for detection of the inter-galactic magnetic field (IGMF). We use the data of Fermi/LAT telescope coupled with LHAASO observatory measurements to confirm the presence of IGMF along the line of sight to the gamma-ray burst GRB221009A. Comparing the Fermi/LAT measurements with the expected level of the pair echo flux, set by the multi-TeV LHAASO detection, we derive a lower bound $10^{-19}$ G on the IGMF with correlation length $l$ larger than 1 Mpc, improving as $l^{-1/2}$ for shorter correlation lengths. This provides an independent verification of existence of a lower bound on IGMF in the voids of the Large Scale Structure, previously derived from the observations of active galactic nuclei.

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Cited by 3 Pith papers

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  1. Cosmologies with a magnetic field, dust, and Lambda

    gr-qc 2025-05 conditional novelty 5.0 of 10

    The paper writes the most general two-scale-factor Bianchi type III universe with dust, an aligned magnetic field, and Lambda in closed quadratures, and evaluates the last remaining integral with elliptic functions.

  2. On the nature of LOFAR RMs and new constraints on magnetic fields in cosmic filaments and on magnetogenesis scenarios

    astro-ph.CO 2024-11 conditional novelty 5.0 of 10

    LOFAR rotation measures imply filament magnetic fields of 11-15 nG at z=0 that strengthen as (1+z)^2.3-2.6, favoring primordial magnetogenesis.

  3. Forward cascade of large-scale primordial magnetic fields during structure formation

    astro-ph.CO 2025-08 conditional novelty 4.0 of 10

    A flux-conservation advection equation reproduces the qualitative forward cascade of primordial magnetic field spectra during structure formation.

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