scholarly journals Gamma-ray observations of blazars and the intergalactic magnetic field spectrum

2015 ◽  
Vol 91 (12) ◽  
Author(s):  
C. Caprini ◽  
S. Gabici
Keyword(s):  
Magnetic Field ◽  
Gamma Ray ◽  
Field Spectrum ◽  
Intergalactic Magnetic Field

scholarly journals Prospect on intergalactic magnetic field measurements with gamma-ray instruments

2012 ◽  
Vol 8 (S294) ◽  
pp. 459-470
Author(s):  
Hélène Sol ◽  
Andreas Zech ◽  
Catherine Boisson ◽  
Henric Krawczynski ◽  
Lisa Fallon ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gamma Ray ◽  
Field Measurements ◽  
High Energy ◽  
Wide Field ◽  
Extragalactic Background Light ◽  
Spatially Extended ◽  
Very High Energy ◽  
Energy Gamma ◽  
Intergalactic Magnetic Field

AbstractObserving high-energy gamma-rays from Active Galactic Nuclei (AGN) offers a unique potential to probe extremely tiny values of the intergalactic magnetic field (IGMF), a long standing question of astrophysics, astroparticle physics and cosmology. Very high energy (VHE) photons from blazars propagating along the line of sight interact with the extragalactic background light (EBL) and produce e+e− pairs. Through inverse-Compton interaction, mainly on the cosmic microwave background (CMB), these pairs generate secondary GeV-TeV components accompanying the primary VHE signal. Such secondary components would be detected in the gamma-ray range as delayed “pair echos” for very weak IGMF (B < 10−16G), while they should result in a spatially extended gamma-ray emission around the source for higher IGMF values (B > 10−16G). Coordinated observations with space (i.e. Fermi) and ground-based gamma-ray instruments, such as the present Cherenkov experiments H.E.S.S., MAGIC and VERITAS, the future Cherenkov Telescope Array (CTA) Observatory, and the wide-field detectors such as HAWC and LHAASO, should allow to analyze and finally detect such echos, extended emission or pair halos, and to further characterize the IGMF.

scholarly journals CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS

2015 ◽  
Vol 814 (1) ◽  
pp. 20 ◽  
Author(s):  
Justin D. Finke ◽  
Luis C. Reyes ◽  
Markos Georganopoulos ◽  
Kaeleigh Reynolds ◽  
Marco Ajello ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gamma Ray ◽  
Intergalactic Magnetic Field

scholarly journals Constraints on the Intergalactic Magnetic Field from Bow Ties in the Gamma-Ray Sky

2020 ◽  
Vol 892 (2) ◽  
pp. 123 ◽  
Author(s):  
Paul Tiede ◽  
Avery E. Broderick ◽  
Mohamad Shalaby ◽  
Christoph Pfrommer ◽  
Ewald Puchwein ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gamma Ray ◽  
Intergalactic Magnetic Field

scholarly journals Search for UHE gamma ray sources in the Magellanic Clouds

1991 ◽  
Vol 148 ◽  
pp. 337-338
Author(s):  
I. A. Bond
Keyword(s):  
Magnetic Field ◽  
Gamma Ray ◽  
High Energy ◽  
Magellanic Clouds ◽  
Ultra High Energy ◽  
Intergalactic Magnetic Field ◽  
Γ Ray ◽  
Experimental Survey

An experimental survey of ultra-high-energy γ-ray sources in the Magellanic Clouds is described. Results of the survey may be used to study the intergalactic magnetic field.

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