Results 201 to 210 of about 643 (219)
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Accretion properties of low‐luminosity active galactic nuclei
Astronomische Nachrichten, 2021AbstractWe aim to leverage the transformational science enabled by the Event Horizon Telescope (EHT) to study the physics of, and near, the black holes in a sample of galaxies covering a large parameter space in supermassive black hole mass, accretion rate, and jet power. To this end, we work on a sample of nearby galaxies whose directly measured black
Venkatessh Ramakrishnan +2 more
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Starbursts in Low Luminosity Active Galactic Nuclei
2005Low Luminosity Active Galactic Nuclei (LLAGN), which comprise low-ionization nuclear emission-line regions (LINERs) and transition-type objects (TOs), represent the most common type of nuclear activity. Here, we search for spectroscopic signatures of starbursts and post-starbursts in LLAGN, and investigate their relationship to the ionization mechanism
Rosa M. González Delgado +1 more
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11.17. Radio emission from low-luminosity active galactic nuclei
Symposium - International Astronomical Union, 1998“Low-luminosity” active galactic nuclei (LLAGNs) typically have ≳ mag, as opposed to −18 to −30 mag for luminous Seyfert 1 nuclei and QSOs. The physical origin of the class of emission-line nuclei known as low-ionization nuclear emission-line regions (LINERs; Heckman 1980) remains controversial.
Schuyler D. Van Dyk, Luis C. Ho
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Revealing Low Luminosity Active Galactic Nuclei (ReveaLLAGN)
2021JWST will be the most sensitive tool ever built for studying the accretion onto supermassive black holes (SMBHs) at the centers of galaxies. While quasars and bright active galactic nuclei (AGN) provide spectacular examples of this accretion, a vast majority of galaxies have black holes accreting at much lower rates.
Seth, Anil C. +28 more
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Ly constraints on very low luminosity active galactic nuclei
Monthly Notices of the Royal Astronomical Society, 2006Recent surveys have detected Lya emission from z = 4.5 to 6.5 at luminosities as low as 10 41 erg s -1 . There is good evidence that low numbers of active galactic nuclei (AGN) are among observed faint Lya emitters. Combining these observations with an empirical relation between the intrinsic Lya and B-band luminosities of AGN, we obtain an upper ...
M. Dijkstra, J. Stuart, B. Wyithe
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Physical Conditions in Low-Luminosity Active Galactic Nuclei
1984Physical conditions in the nuclei of emission-line galaxies are investigated by analyzing their continua and optical emission lines. The strength and shape of the nonstellar continuum is derived for nine Seyfert galaxies. As in QSOs, it is described by a power law with slope ~ -1.1, and in the most luminous objects it flattens at blue and UV ...
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Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 γ-ray Galactic sources
Nature, 2021Zhen Cao, Felix Aharonian, Yiwei Bao
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The Luminosity Function of Quasars and Low Luminosity Active Galactic Nuclei
1986The quasar luminosity function is extended to include the nuclear luminosities of Seyfert 1 galaxies. The model is fitted to the (total) luminosity data for the active galaxies from a complete flux-limited survey. A good fit is obtained with dN/dL∝L-1.2, matching onto the steeper quasar luminosity function near MB=-22.
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All-sky dynamical response of the Galactic halo to the Large Magellanic Cloud
Nature, 2021Charlie Conroy +2 more
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Large metallicity variations in the Galactic interstellar medium
Nature, 2021Annalisa De Cia +2 more
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