Results 21 to 30 of about 553 (183)
Close stars and accretion in low-luminosity active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 Quasar accretion disks are believed to form stars by self-gravity. Low Luminosity Active Galactic Nuclei (LLAGN) are much dimmer galactic centers, and are often believed to be quasars that ran out of gaseous fuel. LLAGN accretion disks should thus co-exist with thousands to millions of stars or proto-stars left from the previous stronger accretion ...
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X-Ray Observations of Low-Luminosity Active Galactic Nuclei [PDF]
International Astronomical Union Colloquium, 1997 AbstractThrough X-ray observations with ASCA, low-luminosity active galactic nuclei have been found in at least seven near-by spiral galaxies. Some of them exhibit very intense, and possibly broad, Fe-K emission lines. Their time variability is relatively insignificant, in contrast to lowluminosity Seyfert galaxies.
K. Makishima +3 more
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Radio Emission from Low-Luminosity Active Galactic Nuclei [PDF]
International Astronomical Union Colloquium, 1998 AbstractMany nearby galaxies show optical evidence for low-luminosity AGNs that are far less luminous than classical Seyfert nuclei and QSOs. LINERs, the most common variety of such emission-line objects, comprise ~ 1/3 of nearby galaxies, and may serve as an important “missing link“ between normal and Seyfert galaxies.
Schuyler D. Van Dyk, Luis C. Ho
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Polarized Broad‐Line Emission from Low‐Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 1999 28 pages, including 3 tables and 16 figures. Uses the emulateapj latex style file.
Barth, A. J. +2 more
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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 accretion flow at low luminosities and accretion rates.
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A Radio Survey for Linear and Circular Polarization in Low-Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2002 We conducted a Very Large Array survey of eleven low luminosity active galactic nuclei for linear and circular polarization at 8.4 GHz. We detected circular polarization in one source (M81*) and linear polarization in 3 sources. Sensitivity limits were ~0.1% for both modes of polarization in 9 of 11 sources.
Bower, Geoffrey C. +2 more
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THE DISK EVAPORATION MODEL FOR THE SPECTRAL FEATURES OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2013 Observations show that the accretion flows in low-luminosity active galactic nuclei (LLAGNs) probably have a two-component structure with an inner ADAF and an outer truncated accretion disk. As shown by Taam et al. (2012), the truncation radius as a function of mass accretion rate is strongly affected by including the magnetic field within the ...
Qiao, Erlin +3 more
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Advanced Science, EarlyView.The protein aggregates and gene expression in the middle temporal gyrus (MTG) and somatosensory cortex (SOM) of the postmortem brains of 13 Alzheimer's disease patients were studied in detail, revealing that small hyperphosphorylated tau aggregates increase with Braak stage driven by microglial inflammation.
Elizabeth A. English +9 more
wiley +1 more source
Principal Component‐Based Classification of Blazar Candidates of Uncertain Type in the 4FGL/LAT
Astronomische Nachrichten, EarlyView.ABSTRACT We adopted principal component analysis (PCA), linear discriminant analysis (LDA), and support vector machines (SVM), to study classification for a sample of 2708 Fermi blazars: 1142 BL Lac objects (BLLs), 759 flat spectrum radio quasars (FSRQs), and 807 blazar candidates of uncertain type (BCUs).
Wen‐Xin Yang +13 more
wiley +1 more source
Discovery of five low-luminosity active galactic nuclei at the centre of the Perseus cluster [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 According to optical stellar kinematics observations, an over-massive black hole candidate has been reported by van den Bosch et al. (2012) in the normal early-type galaxy NGC 1277. This galaxy is located in the central region of the Perseus cluster. Westerbork Synthesis Radio Telescope (WSRT) observations have shown that NGC 1277 and other early-type ...
Park, S. +3 more
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