Results 1 to 10 of about 47,708 (236)
Low-Luminosity Active Galactic Nuclei: Are They UV-Faint and Radio Loud? [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 Low-luminosity AGNs are perceived to be radio loud and devoid of a ``big blue bump'', indicating a transition from a radiatively efficient, geometrically thin, accretion disc in high-luminosity AGNs, to a geometrically thick, radiatively inefficient ...
Maoz, Dan
core +8 more sources
Study of Swift/BAT Selected Low-luminosity Active Galactic Nuclei Observed with Suzaku [PDF]
The Astrophysical Journal, 2016 We systematically analyze the broadband (0.5--200 keV) X-ray spectra of hard X-ray ($>10$ keV) selected local low-luminosity active galactic nuclei (LLAGNs) observed with {\it Suzaku} and {\it Swift}/BAT. The sample consists of ten LLAGNs detected with {\
Kawamuro, Taiki +4 more
core +4 more sources
The Size of the Radio-Emitting Region in Low-luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2005 We have used the VLA to study radio variability among a sample of 18 low luminosity active galactic nuclei (LLAGNs), on time scales of a few hours to 10 days. The goal was to measure or limit the sizes of the LLAGN radio-emitting regions, in order to use
de Bruyn A. G. +12 more
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LINERs as Low-Luminosity Active Galactic Nuclei [PDF]
Advances in Space Research, 1998 Many nearby galaxies contain optical signatures of nuclear activity in the form of LINER nuclei. LINERs may be the weakest and most common manifestation of the quasar phenomenon.
Antonucci +44 more
core +3 more sources
Polarized Broad-Line Emission from Low-Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 1999 In order to determine whether unified models of active galactic nuclei apply to low-luminosity objects, we have undertaken a spectropolarimetric survey of of LINERs and Seyfert nuclei at the Keck Observatory. The 14 objects observed have a median H-alpha
Aaron J. Barth +8 more
core +4 more sources
Are most low-luminosity active galactic nuclei really obscured? [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 At low Eddington ratios (ṁ), two effects make it more difficult to detect certain active galactic nuclei (AGN) given a particular set of selection methods.
Hernquist, Lars +3 more
core +4 more sources
Origin of Radio Emission from Nearby Low-Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2004 We use the observational data in radio, optical and X-ray wavebands, for a sample of active galactic nuclei (AGNs) with measured black hole masses, to explore the origin of radio emission from nearby low-luminosity active galactic nuclei (LLAGNs).
Falcke H. +8 more
core +2 more sources
Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos [PDF]
Nature Communications, 2021 The origins of the soft gamma-ray and high-energy neutrino backgrounds remain unknown. Here, the authors show radiatively inefficient accretion flows of low-luminosity active galactic nuclei can produce the soft gamma ray and high energy neutrino ...
Shigeo S. Kimura +2 more
doaj +2 more sources
Low-Luminosity Accretion in Black Hole X-ray Binaries and Active Galactic Nuclei [PDF]
Astrophysics and Space Science, 2004 At luminosities below a few percent of Eddington, accreting black holes switch to a hard spectral state which is very different from the soft blackbody-like spectral state that is found at higher luminosities.
A. Koratkar +77 more
core +4 more sources
Low-luminosity radio-loud active galactic nuclei [PDF]
Proceedings of 8th European VLBI Network Symposium — PoS(8thEVN), 2007 I review observational properties of low power radio loud AGN. High resolution VLBI observations allow the estimate of the jet velocity and orientation with respect to the line of sight and the determination of the Doppler factor. These data reveal rich structures, including two-sided jets and secondary components. New results on 1144+35, a giant radio
Giovannini, Gabriele +1 more
openaire +3 more sources