Results 91 to 100 of about 238,671 (290)
Berichte zur Wissenschaftsgeschichte, EarlyView.Abstract Short‐lived, unobservable, and not subject to the usual rules of conservation of energy and momentum, virtual particles—an integral part of the conceptual framework of quantum field theory (QFT)—exhibit a number of curious characteristics which, in recent decades, have in part fueled important discussions about their ontological status ...
Jean‐Philippe Martinez
wiley +1 more source
Active galactic nuclei and the origin of IceCube's diffuse neutrino flux [PDF]
Journal of Cosmology and Astroparticle Physics, 2018 The excess of neutrino candidate events detected by IceCube from the direction of TXS 0506+056 has generated a great deal of interest in blazars as sources of high-energy neutrinos.
D. Hooper, T. Linden, A. Vieregg
semanticscholar +1 more source
The Astrophysical Journal Supplement SeriesWe present the active galactic nuclei (AGN) catalog from the fourth data release (HDR4) of the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey.
Chenxu Liu +9 more
doaj +1 more source
Effect of Background Magnetic Field on Ion Weibel Instability With High‐Intensity Short‐Pulse Lasers
Contributions to Plasma Physics, EarlyView.ABSTRACT The effect of finite background magnetic field on magnetic field amplification by Weibel instability using high‐intensity short‐pulse lasers is investigated. We consider Weibel instability for counter‐streaming sub‐relativistic plasma flows generated by shooting pure carbon targets with short‐pulse lasers.
Taiki Jikei +3 more
wiley +1 more source
Space Densities and Emissivities of Active Galactic Nuclei at z > 4
Astrophysical Journal, 2019 The study of the space density of bright active galactic nuclei (AGNs) at z > 4 has been subject to extensive effort given its importance in the estimation of cosmological ionizing emissivity and growth of supermassive black holes.
E. Giallongo +13 more
semanticscholar +1 more source
Dust in Active Galactic Nuclei [PDF]
arXiv, 2008 Dust plays an essential role in the unification theory of active galactic nuclei (AGNs). This review summarizes our current understanding of the extinction and infrared emission properties of the circumnuclear dust in AGNs as well as the inferred dust composition and size distribution.
arxiv
, 2018 I will review the current understanding of the observational and physical properties of jetted active galactic nuclei.
openaire +3 more sources
Variability in Active Galactic Nuclei [PDF]
International Astronomical Union Colloquium, 1993 AbstractAGN (Active Galactic Nuclei) have their profound time variability over a wide range of time scales. Although many results of AGN variability have been provided from wide band wavelength observations, I would like to concentrate the recent problems concerning a nearby region of their central engine based on the X-ray observations which are most ...
openaire +2 more sources
The incidence of obscuration in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 We study the incidence of nuclear obscuration on a complete sample of 1310 AGN selected on the basis of their rest-frame 2-10 keV X-ray flux from the XMM-COSMOS survey, in the redshift range 0 ...
Vincenzo Mainieri +26 more
openaire +6 more sources
ATAC‐seq in Emerging Model Organisms: Challenges and Strategies
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.Principle of ATAC‐seq (left), overview of arthropod species with published ATAC‐seq data (middle), summary of experimental design (right). ABSTRACT The Assay for Transposase‐Accessible Chromatin with sequencing (ATAC‐seq) is a versatile and widely utilized method for identifying potential regulatory regions, such as promoters and enhancers, within a ...
Duğçar Ebrar Erdoğan +13 more
wiley +1 more source