Constraints on the intergalactic magnetic field from<i>Fermi</i>/LAT observations of the ‘pair echo’ of GRB 221009A

Vovk, Ie.; Korochkin, A.; Neronov, A.; Semikoz, D.

doi:10.1051/0004-6361/202347310

A&A

2024

DOI: 10.1051/0004-6361/202347310

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Constraints on the intergalactic magnetic field fromFermi/LAT observations of the ‘pair echo’ of GRB 221009A

Ie. Vovk,

A. Korochkin,

A. Neronov

et al.

Abstract: Delayed `pair-echo' signal from interactions of very-high-energy s in the intergalactic medium can be used for the detection of the intergalactic magnetic field (IGMF). We used the data of the Fermi/LAT telescope coupled with LHAASO observatory measurements to confirm the presence of IGMF along the line of sight to the burst Comparing the Fermi/LAT measurements with the expected level of the pair-echo flux, set by the multi-TeV LHAASO detection, we derived a lower bound $ $ G on the IGMF with correlation lengt… Show more

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Prospects for detection of the pair-echo emission from TeV gamma-ray bursts

Miceli,

Da Vela,

Prandini

2024

A&A

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The intergalactic magnetic field (IGMF) present in the voids of large-scale structures is considered to be the weakest magnetic field in the Universe. Gamma-ray observations of blazars in the GeV-TeV domain have led to lower limits on the IGMF strength based on the search for delayed or extended emission. Nevertheless, these results have been obtained with strong assumptions placed on the unknown source properties. The recent discovery of TeV radiation from gamma-ray bursts (GRBs) has paved the way for IGMF studies with these bright transients. Among the current TeV-detected GRBs, GRB\,190114C, located at a redshift of $z = 0.42$, is the best sampled. Therefore, it can be considered to be representative of the properties of GRBs in the VHE domain. In addition GRB\,221009A ($z = 0.151$) is the brightest event ever detected. We present a phenomenological model based on the intrinsic properties of GRB\,190114C and GRB\,221009A to predict the delayed emission component (pair-echo) in the GeV-TeV band. We investigate the detectability of this component from low-redshift ($z 1$) GRBs for three values of IGMF strength ($10^ $ G, $10^ $ G and $10^ $ G) different observational times ($3$ hrs, $6$ hrs, and $9$ hrs) and source intrinsic properties. We find that for current and future generation gamma -ray instruments extending the observation for at least 3 hours after the GRB detection is a viable strategy for probing the IGMF. We also confirm that GeV-TeV observations of GRBs can probe IGMF strengths on the order of $10^ $ G, representing a competitive alternative to the current studies performed with active galactic nuclei (AGNs)

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Prospects for detection of the pair-echo emission from TeV gamma-ray bursts

Miceli,

Da Vela,

Prandini

2024

A&A

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LiteBIRD science goals and forecasts: primordial magnetic fields

Paoletti,

Rubino-Martin,

Shiraishi

et al. 2024

J. Cosmol. Astropart. Phys.

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We present detailed forecasts for the constraints on the characteristics of primordial magnetic fields (PMFs) generated prior to recombination that will be obtained with the LiteBIRD satellite. The constraints are driven by some of the main physical effects of PMFs on the CMB anisotropies: the gravitational effects of magnetically-induced perturbations; the effects on the thermal and ionization history of the Universe; the Faraday rotation imprint on the CMB polarization spectra; and the non-Gaussianities induced in polarization anisotropies. LiteBIRD represents a sensitive probe for PMFs. We explore different levels of complexity, for LiteBIRD data and PMF configurations, accounting for possible degeneracies with primordial gravitational waves from inflation. By exploiting all the physical effects, LiteBIRD will be able to improve the current limit on PMFs at intermediate and large scales coming from Planck. In particular, thanks to its accurate B-mode polarization measurement, LiteBIRD will improve the constraints on infrared configurations for the gravitational effect, giving B n B=-2.9 1 Mpc< 0.8 nG at 95% C.L., potentially opening the possibility to detect nanogauss fields with high significance. We also observe a significant improvement in the limits when marginalized over the spectral index, B n Bmarg 1 Mpc< 2.2 nG at 95 % C.L. From the thermal history effect, which relies mainly on E-mode polarization data, we obtain a significant improvement for all PMF configurations, with the marginalized case, √⟨B 2⟩marg<0.50 nG at 95 % C.L. Faraday rotation constraints will take advantage of the wide frequency coverage of LiteBIRD and the high sensitivity in B modes, improving the limits by orders of magnitude with respect to current results, B n B=-2.9 1 Mpc < 3.2 nG at 95 % C.L. Finally, non-Gaussianities of the B-mode polarization can probe PMFs at the level of 1 nG, again significantly improving the current bounds from Planck. Altogether our forecasts represent a broad collection of complementary probes based on widely tested methodologies, providing conservative limits on PMF characteristics that will be achieved with the LiteBIRD satellite.

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Constraints on the intergalactic magnetic field fromFermi/LAT observations of the ‘pair echo’ of GRB 221009A

Cited by 2 publications

References 42 publications

Prospects for detection of the pair-echo emission from TeV gamma-ray bursts

Prospects for detection of the pair-echo emission from TeV gamma-ray bursts

LiteBIRD science goals and forecasts: primordial magnetic fields

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