English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The intergalactic magnetic field (IGMF) in cosmic voids can be indirectlyprobed through its effect on electromagnetic cascades initiated by a source ofTeV gamma-rays, such as active galactic nuclei (AGN). AGN that are sufficientlyluminous at TeV energies, "extreme TeV blazars" can produce detectable levelsof secondary radiation from inverse Compton (IC) scattering of the electrons inthe cascade, provided that the IGMF is not too large. We review recent work inthe literature which utilizes this idea to derive constraints on the IGMF forthree TeV-detected blazars-1ES 0229+200, 1ES 1218+304, and RGB J0710+591, andwe also investigate four other hard-spectrum TeV blazars in the same framework.Through a recently developed detailed 3D particle-tracking Monte Carlo code,incorporating all major effects of QED and cosmological expansion, we researcheffects of major uncertainties such as the spectral properties of the source,uncertainty in the UV - far IR extragalactic background light (EBL),undersampled Very High Energy (VHE; energy > 100 GeV) coverage, past history ofgamma-ray emission, source vs. observer geometry, and jet AGN Doppler factor.The implications of these effects on the recently reported lower limits of theIGMF are thoroughly examined to conclude that presently available data arecompatible with a zero IGMF hypothesis.

Intergalactic Magnetic Fields and Gamma Ray Observations of Extreme TeV Blazars