Results 11 to 20 of about 643 (219)
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
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The Astrophysical JournalDisk continuum reverberation mapping is one of the primary ways we learn about active galactic nuclei (AGN) accretion disks. Reverberation mapping assumes that time-varying X-rays incident on the accretion disk drive variability in UV–optical light ...
Amy Secunda +2 more
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Observational Evidence for Hot Wind Impact on Parsec Scales in Low-luminosity Active Galactic Nuclei [PDF]
The Astrophysical JournalSupermassive black holes in galaxies spend the majority of their lifetime in the low-luminosity regime, powered by hot accretion flow. Strong winds launched from the hot accretion flow have the potential to play an important role in active galactic ...
Fangzheng Shi +4 more
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Comparing Observed Properties of Winds in Low-luminosity Active Galactic Nuclei with Theoretical Predictions [PDF]
The Astrophysical JournalTheoretical and numerical simulations of black hole hot accretion flows have shown the ubiquitous existence of winds and predicted their properties, such as velocity and mass flux.
Fangzheng Shi +3 more
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Do LINER 2 galaxies harbour low-luminosity active galactic nuclei? [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We use ROSAT HRI spatial data and ASCA spectral measurements for a sample of seven nearby, early type spiral galaxies, to address the question of whether a low-luminosity Active Galactic Nucleus (LLAGN) is present in galaxies that have a LINER 2 classification.
T. P. Roberts +2 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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Evidence That Shocks Destroy Small PAH Molecules in Low-luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2022 Abstract We combined mapping-mode mid-infrared Spitzer spectra with complementary infrared imaging to perform a spatially resolved study of polycyclic aromatic hydrocarbon (PAH) emission from the central regions of 66 nearby galaxies, roughly evenly divided into star-forming systems and low-luminosity active galactic nuclei (AGNs).
Lulu Zhang, Luis C. Ho, Aigen Li
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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.
D. Maoz
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Emission from the jets of Low-luminosity Active Galactic Nuclei
Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), 2023 Gunjan Tomar +2 more
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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 ...
Sergei Nayakshin
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