Results 81 to 90 of about 238,671 (290)
Reconfinement and Loss of Stability in Jets from Active Galactic Nuclei [PDF]
Nature Astronomy volume 2, pages 167-171 (2018), 2018 Jets powered by active galactic nuclei appear impressively stable compared with their terrestrial and laboratory counterparts-they can be traced from their origin to distances exceeding their injection radius by up to a billion times. However, some less energetic jets get disrupted and lose their coherence on the scale of their host galaxy.
arxiv +1 more source
Proton Acceleration with Relativistic Electromagnetic Shock
Advanced Science, EarlyView.New Ion Acceleration Mechanism! A novel cosmic‐ray proton acceleration mechanism is proposed, where relativistic electromagnetic shocks accelerate protons transversely. Hamiltonian analysis yields a scaling law linking the proton energy to the minimum longitudinal thickness of the shock.
Ting Xiao +5 more
wiley +1 more source
Dusty Winds in Active Galactic Nuclei: Reconciling Observations with Models [PDF]
, 2017 This Letter presents a revised radiative transfer model for the infrared (IR) emission of active galactic nuclei (AGNs). While current models assume that the IR is emitted from a dusty torus in the equatorial plane of the AGNs, spatially resolved ...
S. Hönig, M. Kishimoto
semanticscholar +1 more source
The Slow‐Rotating Nucleus of Comet C/2013 R1 (Lovejoy)
Astronomische Nachrichten, EarlyView.ABSTRACT The close approach of comet C/2013 R1 (Lovejoy) allowed us to conduct an in‐depth study of the morphology of the inner coma. From the measurement of the dust emission structures expanding near the cometary nucleus in November–December 2013, we derived a slow rotation period of 47.8±1.2$$ 47.8\pm 1.2 $$ h.
Federico Manzini +12 more
wiley +1 more source
The dust covering factor in active galactic nuclei [PDF]
, 2016 The primary source of emission of active galactic nuclei (AGNs), the accretion disc, is surrounded by an optically and geometrically thick dusty structure ('the so-called dusty torus').
M. Stalevski +5 more
semanticscholar +1 more source
The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei
The Astrophysical JournalIt has previously been found that the galaxy cluster environment can affect the fueling and evolution of active galactic nuclei (AGN). This work examines the effect of the merging cluster environment on the properties of radio AGN by comparing the radio ...
Mary Rickel +6 more
doaj +1 more source
Does the Radiative Avalanche Fueling Work in Any Active Galactic Nuclei ? [PDF]
, 1997 Recently Umemura, Fukue, & Mineshige (1997) proposed the radiative avalanche fueling to active galactic nuclei; gas accretion is driven by radiation drag exerted by stellar radiation from circumnuclear starburst regions. This mechanism is also interesting in terms of starburst-AGN connections.
arxiv +1 more source
Astronomische Nachrichten, EarlyView.ABSTRACT The physics of heavy‐ion collisions is one of the most exciting and challenging directions of science for the last four decades. On the theoretical side one deals with a non‐abelian field theory, while on the experimental side today's largest accelerators are needed to enable these studies.
Marcus Bleicher, Elena Bratkovskaya
wiley +1 more source
Active Galactic Nuclei: Boon or Bane for Biota? [PDF]
Astrophysical Journal, 2019 Active galactic nuclei (AGNs) emit substantial fluxes of high-energy electromagnetic radiation, and have therefore attracted some recent attention for their negative impact on galactic habitability.
M. Lingam, I. Ginsburg, S. Bialy
semanticscholar +1 more source
The Pan-STARRS1 z > 5.6 Quasar Survey. II. Discovery of 55 Quasars at 5.6 < z < 6.5
The Astrophysical Journal Supplement Series, 2023 The identification of bright quasars at z ≳ 6 enables detailed studies of supermassive black holes, massive galaxies, structure formation, and the state of the intergalactic medium within the first billion years after the Big Bang.
Eduardo Bañados +22 more
doaj +1 more source