Results 31 to 40 of about 184,376 (200)
The Size of the Radio‐Emitting Region in Low‐Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2005 61 pages, 17 figures, 10 tables.
James S. Ulvestad +3 more
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Observational Constraints on Direct Electron Heating in the Hot Accretion Flows in Sgr A* and M87*
The Astrophysical Journal, 2022 An important parameter in the theory of hot accretion flows around black holes is δ , which describes the fraction of “viscously” dissipated energy in the accretion flow that goes directly into heating electrons.
Fu-Guo Xie, Ramesh Narayan, Feng Yuan
doaj +1 more source
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.
Y. Terashima +3 more
openaire +2 more sources
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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THE NUCLEAR INFRARED EMISSION OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI
The Astronomical Journal, 2012 Accepted for publication in ...
Itziar Aretxaga +12 more
openaire +6 more sources
A Candidate for the Least-massive Black Hole in the First 1.1 Billion Years of the Universe
The Astrophysical Journal Letters, 2023 We report a candidate of a low-luminosity active galactic nucleus (AGN) at z = 5 that was selected from the first near-infrared images of the JWST CEERS project.
Masafusa Onoue +8 more
doaj +1 more source
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 ...
openaire +5 more sources
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 ...
Songyoun Park +6 more
openaire +5 more sources
The Astrophysical Journal, 2023 The variability of submillimeter emission provides a useful tool to probe the accretion physics in low-luminosity active galactic nuclei. We accumulate four years of observations using the Submillimeter Array for Centaurus A, NGC 4374, NGC 4278, and NGC ...
Bo-Yan Chen +7 more
doaj +1 more source
15-GHz radio emission from nearby low-luminosity active galactic nuclei [PDF]
Astronomy & Astrophysics, 2018 We present a sub-arcsec resolution radio imaging survey of a sample of 76 low-luminosity active galactic nuclei (LLAGN) that were previously not detected with the Very Large Array at 15 GHz. Compact, parsec-scale radio emission has been detected above a flux density of 40 μ Jy in 60% (45 of 76) of the LLAGN sample.
Saikia, Payaswini +7 more
openaire +10 more sources