Bibliographic Details
| Title: |
New Method for Investigating the Presence of Extragalactic Magnetic Fields. |
| Authors: |
Stern, B.1 (AUTHOR) stern@inr.ru, Tkachev, I.1,2 (AUTHOR) |
| Source: |
JETP Letters. Feb2026, Vol. 123 Issue 4, p224-230. 7p. |
| Subjects: |
Cosmic magnetic fields, Gamma rays, Gamma ray astronomy, Active galactic nuclei, Astrophysics |
| Abstract: |
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. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
