Results 81 to 90 of about 126,463 (267)

Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei

open access: yesAstronomische Nachrichten, EarlyView.
ABSTRACT Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre‐existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources.
Patrik Milán Veres
wiley   +1 more source

Numerical simulations of mixing conditions and aerosol dynamics in the CERN CLOUD chamber

open access: yes, 2012
To study the effect of galactic cosmic rays on aerosols and clouds, the Cosmics Leaving OUtdoor Droplets (CLOUD) project was established. Experiments are carried out at a 26.1 m3 tank at CERN (Switzerland).
Voigtländer, Jens   +4 more
core   +1 more source

Searches for Neutrinos from Large High Altitude Air Shower Observatory Ultra-high-energy γ-Ray Sources Using the IceCube Neutrino Observatory

open access: yesThe Astrophysical Journal Letters, 2023
Galactic PeV cosmic-ray accelerators (PeVatrons) are Galactic sources theorized to accelerate cosmic rays up to PeV in energy. The accelerated cosmic rays are expected to interact hadronically with nearby ambient gas or the interstellar medium, resulting
R. Abbasi   +389 more
doaj   +1 more source

Ionization of the Venusian atmosphere from Solar and Galactic Cosmic Rays [PDF]

open access: yes, 2015
The atmospheres of the terrestrial planets are exposed to solar and galactic cosmic rays, the most energetic of which are capable of affecting deep atmospheric layers through extensive nuclear and electromagnetic particle cascades.
Desorgher, L   +13 more
core   +1 more source

From Flybys to Sample Return: A Review of Space Probes and Robotic Sampling Technologies for Small Bodies

open access: yesJournal of Field Robotics, EarlyView.
ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang   +3 more
wiley   +1 more source

Electrons in the cosmic radiation [PDF]

open access: yes, 1990
The nature of cosmic ray electrons and their radiation in the Universe has been studied. A convection associated diffusion model is proposed to describe the main characteristics of the large-scale distribution of cosmic ray electrons in the Galaxy: (1) a
Chi, Xinyu, Chi, X
core  

Tillich's Schellingian Styles

open access: yesThe Heythrop Journal, EarlyView.
Abstract In this essay I contend that, whatever one might say about F.W.J. Schelling's historical and conceptual influence on Paul Tillich's doctrines, the overall style of Tillich's project can helpfully be dubbed Schellingian to the extent it mixes together discourses, genres, and vocabularies into an ever‐expanding whole. To the extent that anything
Daniel Whistler
wiley   +1 more source

Shape of spectrum of galactic cosmic ray intensity fluctuations

open access: yesSolar-Terrestrial Physics, 2022
The impact of solar wind plasma on fluxes of galactic cosmic rays (CR) penetrating from the outside into the heliosphere with energies above ~1 GeV leads to temporal variations in the CR intensity in a wide frequency range.
Starodubtsev S. A.
doaj   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty   +7 more
wiley   +1 more source

Galactic cosmic rays

open access: yesJournal of Physics: Conference Series, 2006
In this brief review we describe the theory of the origin of Galactic cosmic rays. The concept that interaction near the source is the dominant source of ?-rays, and spallation secondaries seems best suited to explain the EGRET ?-spectrum of the inner Galaxy, the abundances of light elements, the anti-protons and the positrons.
openaire   +1 more source

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