Results 41 to 50 of about 1,204 (229)
Astronomische Nachrichten, Volume 344, Issue 1-2, January-February 2023., 2023 Abstract Star‐forming and starburst galaxies (SBGs), which are well‐known cosmic‐ray (CR) reservoirs, are expected to emit gamma rays and neutrinos predominantly via hadronic collisions. In this work we analyze the 10‐year Fermi‐Low Energy Technique (LAT) spectral energy distributions of 13 nearby galaxies by means of a physical model that accounts for
Antonio Marinelli +5 more
wiley +1 more source
A Wideband Polarization Observation of Hydra A with the Jansky Very Large Array
The Astrophysical Journal, 2023 We present the results of a wideband high-resolution polarization study of Hydra A, one of the most luminous FR I radio galaxies known and among the most well studied. The radio emission from this source displays extremely large Faraday rotation measures
Lerato Baidoo +5 more
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LRS Bianchi Type‐I String Cosmological Models in f(Q) Gravity
Journal of Mathematics, Volume 2023, Issue 1, 2023., 2023 In the current study, we studied a f(Q)‐gravitational, anisotropic, locally rotationally symmetric (LRS), Bianchi type‐I spacetime universe. We have adopted the freely chosen function fQ=Q+αQ, where α is a model‐free parameter. We assumed that the universe is filled with dusty string fluid and that the shear scalar (σ) and the expansion scalar (θ) are ...
Mukesh Kumar +5 more
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Soft X‐Ray Imaging of Magnetopause Reconnection Outflows Under Low Plasma‐β Solar Wind Conditions
Geophysical Research Letters, Volume 49, Issue 19, 16 October 2022., 2022 Abstract We examined soft X‐ray emission by the solar wind charge‐exchange process around the Earth's magnetosphere using a global magnetohydrodynamic simulation model. The dayside magnetopause reconnection heats and accelerates the plasma whereby the X‐ray emission becomes as bright as ∼6 × 10−6 eV cm−3 s−1 under the southward interplanetary magnetic ...
Yosuke Matsumoto, Yoshizumi Miyoshi
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Space Weather, Volume 20, Issue 3, March 2022., 2022 Abstract High‐energetic charged particles, such as solar protons, and phenomena such as Forbush decreases are eligible candidates to affect the global electric circuit. These effects have been studied by analyzing disturbances of the potential gradient in ground‐based measurements in fair weather regions. In this paper, we investigate deviations in the
J. Tacza +6 more
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Probing UHECR production in Centaurus A using secondary neutrinos and gamma-rays
European Physical Journal C: Particles and Fields, 2021 In this paper the production of neutrinos and photons by ultra high energy cosmic rays (UHECR) interacting with the extragalactic background radiation is studied.
Cainã de Oliveira, Vitor de Souza
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The quest for extragalactic magnetic fields [PDF]
Proceedings of Neutrino Oscillation Workshop — PoS(NOW2016), 2017 3 pages, 1 figure, Proceeding of Neutrino Oscillation Workshop, 4-11 September 2016, Otranto (Italy)
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New Insights in Extragalactic Magnetic Fields [PDF]
Proceedings of the International Astronomical Union, 2018 AbstractIn this contribution we introduce the motivation and goals of IAU Focus Meeting 8, “New Insights in Extragalactic Magnetic Fields”. We provide a background for the nine contributions included in these proceedings, as well as the online contributions.
Luigina Feretti +4 more
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Inflationary and Phase-transitional Primordial Magnetic Fields in Galaxy Clusters
The Astrophysical Journal, 2023 Primordial magnetic fields (PMFs) are possible candidates for explaining the observed magnetic fields in galaxy clusters. Two competing scenarios of primordial magnetogenesis have been discussed in the literature: inflationary and phase-transitional.
Salome Mtchedlidze +6 more
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Core shifts, magnetic fields and magnetization of extragalactic jets [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 We study the effect of radio-jet core shift, which is a dependence of the position of the jet radio core on the observational frequency. We derive a new method of measuring the jet magnetic field based on both the value of the shift and the observed radio flux, which complements the standard method that assumes equipartition.
Zdziarski, Andrzej A. +3 more
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