Results 191 to 200 of about 38,012 (210)

ON THE DISAPPEARANCE OF THE BROAD-LINE REGION IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI

Astrophysical Journal, 2009
The disk-wind scenario for the broad-line region (BLR) and toroidal obscuration in active galactic nuclei (AGNs) predicts the disappearance of the BLR at low luminosities. In accordance with the model predictions, data from a nearly complete sample of nearby AGNs show that the BLR disappears at luminosities lower than 5 × 1039(M/107 M☉)2/3 ergs-1 ...
Moshe Elitzur, Luis C Ho
exaly   +3 more sources

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Starbursts in Low Luminosity Active Galactic Nuclei

2005
Low 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, Roberto Cid Fernandes   +1 more
openaire   +1 more source

Revealing Low Luminosity Active Galactic Nuclei (ReveaLLAGN)

2021
JWST 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., Boeker, Torsten, Burtscher, Leonard, Davis, Timothy Andrew, Dumont, Antoine Andre, Feldmeier-Krause, Anja, Fernandez Ontiveros, Juan Antonio, Gallo, Elena, Greene, Jenny Emma, Gultekin, Kayhan, Ho, Luis C., Hoenig, Sebastian F., Kamann, Sebastian, Kirkpatrick, Allison, Luetzgendorf, Nora, Markoff, Sera, Neumayer, Nadine, Pellegrini, Eric William, Plotkin, Richard M., Prieto, Almudena, Reines, Amy E., Runnoe, Jessie Caye, Satyapal, Shobita, Strader, Jay, Trump, Jonathan R., Voggel, Karina, Walsh, Jonelle L., Yuan, Feng, van de Ven, Glenn   +28 more
openaire   +1 more source

Ly  constraints on very low luminosity active galactic nuclei

Monthly Notices of the Royal Astronomical Society, 2006
Recent 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
openaire   +1 more source

Physical Conditions in Low-Luminosity Active Galactic Nuclei

1984
Physical 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 ...
openaire   +1 more source

Activity and Feeding in Nearby Low Luminosity Galactic Nuclei [PDF]

, 2014
Throughout the last decades a number of correlations between the proper- ties of the supermassive black holes (SMBH) in the center of galaxies and their hosting galaxies have been found. This suggests that these compo- nents influence each other in their evolution.
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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
openaire   +1 more source

The Luminosity Function of Quasars and Low Luminosity Active Galactic Nuclei

1986
The 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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Emission from the jets of Low-luminosity Active Galactic Nuclei

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), 2023
Gunjan Tomar, Nayantara Gupta, Raj Prince   +2 more
openaire   +1 more source

An X-Ray approach to low luminosity active galactic nuclei

2009
Tesis Univ. Granada. Departamento de Física Teórica y del Cosmos.
openaire   +1 more source