Results 91 to 100 of about 4,214,854 (199)
Evolution of Magnetic Field of the Quasar 1604+159 at parsec Scale
The Astrophysical JournalWe have analyzed the total intensity, spectral index, linear polarization, and rotation measure (RM) distributions at the parsec scale for the quasar 1604+159.
Xu-Zhi Hu +5 more
doaj +1 more source
BLAZAR HALOS AS PROBE FOR EXTRAGALACTIC MAGNETIC FIELDS AND MAXIMAL ACCELERATION ENERGY [PDF]
, 2009 High-energy photons from blazars interact within tens of kpc with the extragalactic photon background, initiating electromagnetic pair cascades. The charged component of such cascades is deflected by extragalactic magnetic fields (EGMFs), leading to ...
K. Dolag +3 more
semanticscholar +1 more source
Modeling the Emission and Polarization Properties of Pulsating Ultraluminous X‐Ray Sources
Astronomische Nachrichten, Volume 346, Issue 1, January 2025.ABSTRACT Pulsating Ultraluminous X‐ray Sources (PULXs) are a class of extragalactic sources with high X‐ray luminosity, in excess of 1039$$ {10}^{39} $$ erg s−1$$ {\mathrm{s}}^{-1} $$, and showing pulsations that associate them with neutron stars accreting at a super‐Eddington rate.
S. Conforti +6 more
wiley +1 more source
GRB 221009A: A Light Dark Matter Burst or an Extremely Bright Inverse Compton Component?
The Astrophysical Journal, 2023 Gamma-ray bursts (GRBs) have been considered as potential very high energy photon emitters due to the large amount of energy released as well as the strong magnetic fields involved in their jets.
M. M. González +7 more
doaj +1 more source
Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum [PDF]
, 2007 Various experiments indicate the existence of a second knee around energy E=3x10{sup 17} eV in the cosmic ray spectrum. This feature could be the signature of the end of the galactic component and of the emergence of the extragalactic one, provided that ...
K. Kotera, M. Lemoine
semanticscholar +1 more source
Cosmic magnetic fields from density perturbations
, 2023 reservedMagnetic fields are observed on nearly all scales in the Universe, from stars and galaxies up to galaxy clusters and even beyond. The origin of cosmic magnetic fields remains an open question; however, a large class of models puts its origin in ...
PAVONE, ELISABETTA
core
Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto +9 more
wiley +1 more source
The Astrophysical Journal LettersWe calculate the arrival direction distribution of ultrahigh-energy cosmic rays (UHECRs) with a new suite of models of the Galactic magnetic field (GMF), assuming sources follow the large-scale structure of the Universe.
Teresa Bister +2 more
doaj +1 more source
Effects of Forbush Decreases on the Global Electric Circuit
Space Weather, Volume 22, Issue 4, April 2024.Abstract The suppression of high‐energy cosmic rays, known as Forbush decreases (FDs), represents a promising factor in influencing the global electric circuit (GEC) system. Researchers have delved into these effects by examining variations, often disruptive, of the potential gradient (PG) in ground‐based measurements taken in fair weather regions.
J. Tacza, G. Li, J.‐P. Raulin
wiley +1 more source
The Astrophysical JournalWe present the first results of one extremely high-resolution, nonradiative magnetohydrodynamical cosmological zoom-in simulation of a massive cluster with a virial mass of M _vir = 2.0 × 10 ^15 solar masses. We adopt a mass resolution of 4 × 10 ^5 M _⊙
Ulrich P. Steinwandel +3 more
doaj +1 more source