Release of protons with energy >1018 eV from intergalactic magnetic field into interstellar magnetic field

1983 ◽  
Vol 94 (1) ◽  
pp. 171-175 ◽  
Author(s):  
Ajoy K. Dasgupta
Keyword(s):  
Magnetic Field ◽  
Intergalactic Magnetic Field

scholarly journals Impact of Plasma Instability on Constraint of the Intergalactic Magnetic Field

2018 ◽  
Vol 870 (1) ◽  
pp. 17 ◽  
Author(s):  
Dahai Yan ◽  
Jianeng Zhou ◽  
Pengfei Zhang ◽  
Qianqian Zhu ◽  
Jiancheng Wang
Keyword(s):  
Magnetic Field ◽  
Plasma Instability ◽  
Intergalactic Magnetic Field

scholarly journals Fisher analysis on wide-band polarimetry for probing the intergalactic magnetic field

2014 ◽  
Vol 66 (1) ◽  
pp. 5 ◽  
Author(s):  
Shinsuke Ideguchi ◽  
Keitaro Takahashi ◽  
Takuya Akahori ◽  
Kohei Kumazaki ◽  
Dongsu Ryu
Keyword(s):  
Magnetic Field ◽  
Wide Band ◽  
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 A Large-scale, Regular Intergalactic Magnetic Field Associated with Stephan’s Quintet?

2020 ◽  
Vol 898 (2) ◽  
pp. 110
Author(s):  
Błażej Nikiel-Wroczyński ◽  
Marian Soida ◽  
George Heald ◽  
Marek Urbanik
Keyword(s):  
Magnetic Field ◽  
Large Scale ◽  
Intergalactic Magnetic Field

scholarly journals The Milky Way Disk Warp

1989 ◽  
Vol 120 ◽  
pp. 537-537 ◽  
Author(s):  
E. Florido ◽  
E. Battaner ◽  
E. Alfaro ◽  
M.L. Sanchez-Saavedra
Keyword(s):  
Magnetic Field ◽  
Milky Way ◽  
Magellanic Clouds ◽  
Open Clusters ◽  
Late Type ◽  
Tidal Interaction ◽  
Different Ages ◽  
Γ Rays ◽  
Intergalactic Magnetic Field

A warped disk in our own galaxy is evident by means of HI, HII, γ-rays and dust observations, but unexistent when star distributions are considered, specially those of late type stars. This fact is in disagreement with the theories which assume a gravitational origin of warps, for instance a tidal interaction with the Magellanic Clouds. We tried to find the z-distribution of open clusters of different ages, for which a warp distribution was neither found nor rejected. Assuming an intergalactic magnetic field origin of the warp, we obtain a direction of the field in the Milky Way neighborhood given by (b,1) = (45°, 74°).

scholarly journals Hilltop Inflation and Generation of Helical Magnetic Field

Universe ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 26
Author(s):  
Sumanta Chakraborty ◽  
Supratik Pal ◽  
Soumitra SenGupta
Keyword(s):  
Magnetic Field ◽  
Power Spectrum ◽  
Quantum Electrodynamics ◽  
Anomaly Cancellation ◽  
Significant Strength ◽  
Intergalactic Magnetic Field ◽  
Helical Magnetic Field ◽  
Sufficient Strength ◽  
Large Parameter Space ◽  
The Magnetic Field

Primordial magnetic field generated in the inflationary era can act as a viable source for the present day intergalactic magnetic field of sufficient strength. We present a fundamental origin for such a primordial generation of the magnetic field, namely through anomaly cancellation of U(1) gauge field in quantum electrodynamics in the context of hilltop inflation. We have analysed at length the power spectrum of the magnetic field, thus generated, which turns out to be helical in nature. We have also found that magnetic power spectrum has significant scale-dependence giving rise to a non-trivial magnetic spectral index, a key feature of this model. Interestingly, there exists a large parameter space, where magnetic field of significant strength can be produced.

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