Results 21 to 30 of about 184,376 (200)
The Astrophysical Journal, 2023 To understand the formation and growth of supermassive black holes (SMBHs) and their coevolution with host galaxies, it is essential to know the impact of environment on the activity of active galactic nuclei (AGNs).
Zhensong Hu +16 more
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NuSTAR Observes Two Bulgeless Galaxies: No Hard X-Ray AGN Detected in NGC 4178 or J0851+3926
The Astrophysical Journal, 2023 The discovery over the last several decades of low- and moderate-luminosity active galactic nuclei (AGNs) in disk-dominated galaxies—which show no “classical” bulges—suggests that secular mechanisms represent an important growth pathway for supermassive ...
Ryan W. Pfeifle +7 more
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Hydrodynamical Simulations of the Triggering of Nuclear Activities by Minor Mergers of Galaxies [PDF]
2019, Research in Astronomy and Astrophysics, 19, 177, 2021 Major mergers of galaxies are considered to be an efficient way to trigger Active Galactic Nuclei and are thought to be responsible for the phenomenon of quasars. This has however recently been challenged by observations of a large number of low luminosity Active Galactic Nuclei at low redshift ($z\lesssim1$) without obvious major merger signatures ...
arxiv +1 more source
Study of Torus Structures in Low-luminosity Active Galactic Nuclei with Suzaku [PDF]
Proceedings of 10th INTEGRAL Workshop: A Synergistic View of the High-Energy Sky — PoS(Integral2014), 2015 T. Kawamuro
openalex +2 more sources
The Spectral Energy Distributions of Low‐Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 1999 To appear in The Astrophysical Journal.
Luis C. Ho, Luis C. Ho
openaire +4 more sources
Broadband Modeling of Low-luminosity Active Galactic Nuclei Detected in Gamma Rays [PDF]
The Astrophysical Journal, 2021 Abstract Low-luminosity active galactic nuclei are more abundant and closer to us than the luminous ones but harder to explore as they are faint. We have selected the four sources, NGC 315, NGC 4261, NGC 1275, and NGC 4486, which have been detected in γ-rays by Fermi-LAT.
Gunjan Tomar +2 more
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THE LOW-LUMINOSITY END OF THE RADIUS-LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2013 We present an updated and revised analysis of the relationship between the Hbeta broad-line region (BLR) radius and the luminosity of the active galactic nucleus (AGN). Specifically, we have carried out two-dimensional surface brightness decompositions of the host galaxies of 9 new AGNs imaged with the Hubble Space Telescope Wide Field Camera 3.
Alexei V. Filippenko +18 more
openaire +5 more sources
X-Ray Flares in the Long-term Light Curve of Low-luminosity Active Galactic Nucleus M81*
The Astrophysical Journal, 2023 Most active galactic nuclei at the center of the nearby galaxies have supermassive black holes accreting at sub-Eddington rates through hot accretion flows or radiatively inefficient accretion flows, which efficiently produce jets.
Gunjan Tomar, Nayantara Gupta
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EVIDENCE OF PARSEC-SCALE JETS IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2014 The nuclear radio emission of low-luminosity active galactic nuclei (LLAGN) is often associated with unresolved cores. In this paper we show that most LLAGN present extended jet radio emission when observed with sufficient angular resolution and sensitivity. They are thus able to power, at least, parsec-scale radio jets.
M. A. Prieto +4 more
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Low-Luminosity Active Galactic Nuclei [PDF]
Symposium - International Astronomical Union, 1989 I review the basic properties of low-luminosity active galactic nuclei (LLAGNs) — objects in which activity similar to, but intrinsically milder than, that in QSOs and luminous Seyferts is believed to be present. Until recently, most LLAGNs were first recognized as such and studied at optical wavelengths, but evidence for activity and valuable ...
openaire +2 more sources