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<p>The extragalactic magnetic field could be detected by searching for signatures of the electromagnetic cascade initiated by high-energy photons on the intergalactic radiation and deflected by the field. This process produces a time delay and an extended gamma-ray halo around the source, which are looked for. We propose a new signature of electromagnetic echoes: the asymmetry of the gamma-ray distribution around blazars. As a measure of asymmetry, we use the offset of the gamma-ray distribution to the location of the blazar. This offset is due to the tilt of the jet of the blazar relative to the line of sight. Using a subsample of the ten brightest BL Lacs, we exclude the range of extragalactic magnetic fields from 10<sup>–16</sup> to 10<sup>–14</sup> G, assuming that these objects have maintained a constant average luminosity over hundreds of thousands of years.</p>

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New Method for Investigating the Presence of Extragalactic Magnetic Fields

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月9日

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  • B. Stern,
  • I. Tkachev

摘要

The extragalactic magnetic field could be detected by searching for signatures of the electromagnetic cascade initiated by high-energy photons on the intergalactic radiation and deflected by the field. This process produces a time delay and an extended gamma-ray halo around the source, which are looked for. We propose a new signature of electromagnetic echoes: the asymmetry of the gamma-ray distribution around blazars. As a measure of asymmetry, we use the offset of the gamma-ray distribution to the location of the blazar. This offset is due to the tilt of the jet of the blazar relative to the line of sight. Using a subsample of the ten brightest BL Lacs, we exclude the range of extragalactic magnetic fields from 10–16 to 10–14 G, assuming that these objects have maintained a constant average luminosity over hundreds of thousands of years.