Results 11 to 20 of about 3,447,628 (240)
Jetted Active Galactic Nuclei [PDF]
, 2018 The term "blazar" refers to a cosmic source with a relativistic jet viewed at a small angle, so that the electromagnetic emission is affected by beaming.
Foschini, Luigi (5113958) +1 more
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Letter to Nature: An ultra-relativistic outflow from a neutron star accreting gas from a companion. [PDF]
, 2004 Collimated relativistic outflows—also known as jets—are amongst the most energetic phenomena in the Universe. They are associated with supermassive black holes in distant active galactic nuclei1, accreting stellar-mass black holes and neutron stars in ...
Johnston, H. +27 more
core +1 more source
Is There a Metallicity-Luminosity Relationship in Active Galactic Nuclei? The Case of Narrow-Line Seyfert 1 Galaxies [PDF]
, 2002 This article discusses the relationship between metallicity and luminosity in active galactic nuclei by introducing new metallicity measurements for a sample of narrow-line Seyfert 1 ...
Netzer, Hagai +3 more
core +1 more source
Obscured active galactic nuclei [PDF]
AIP Conference Proceedings, 2001 The properties of the absorption in type 2, narrow line AGNs are reviewed by focusing on the X-ray indicators. I discuss the properties of the cold absorbing medium (the putative torus) and of the reprocessed components, as well as their implications for the unified model.
openaire +2 more sources
THE EVOLUTION OF ACTIVE GALACTIC NUCLEI AND THEIR SPINS [PDF]
The Astrophysical Journal, 2013 ApJ, in ...
Volonteri, M. +3 more
openaire +4 more sources
JETTED ACTIVE GALACTIC NUCLEI [PDF]
International Journal of Modern Physics: Conference Series, 2012 Most of the electromagnetic output of blazars (BL Lac objects and Flat Spectrum Radio Quasars) comes out in the γ–ray band, making the Large Area Telescope [0.1–100 GeV] onboard the Fermi satellite and the Cherenkov telescopes crucial for gather crucial data and thus to understand their physics.
openaire +2 more sources
VARIABILITY OF ACTIVE GALACTIC NUCLEI [PDF]
, 2001 Continuum and emission-line variability of active galactic nuclei provides a powerful probe of microarcsecond scale structures in the central regions of these sources. In this contribution, we review basic concepts and methodologies used in analyzing AGN variability.
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Modelling accretion disk winds in quasars
, 2014 Outflows are ubiquitous in active galactic nuclei (AGN). They can take the form of either dramatic radio jets, which extend vast distances into the inter-galactic medium, or of much smaller scale winds - whose existence can be inferred only indirectly ...
Nick Higginbottom +1 more
core +2 more sources
The Astrophysical Journal Supplement Series, 2022 We present the BAT AGN Spectroscopic Survey (BASS) Near-infrared Data Release 2 (DR2), a study of 168 nearby ( $\bar{z}=0.04$ , z < 0.6) active galactic nuclei (AGN) from the all-sky Swift Burst Array Telescope X-ray survey observed with the Very Large ...
Jakob S. den Brok +22 more
doaj +1 more source
Serching for AGNs with VST: optical variability in the COSMOS and CDFS regions
, 2016 Active Galactic Nuclei (AGN) are characterised by strong variability at all wavelengths. We exploited 3 years of VST monitoring observations of the COSMOS and CDFS regions, performed within the SUDARE/VOICE surveys, to assemble a sample of AGN candidates
Falocco, S. (5201278) +12 more
core +1 more source