Supermassive Black Holes in Active Galactic Nuclei [PDF]
, 2000 This article gives a brief overview of the direct and indirect evidence in support of the standard paradigm that active galactic nuclei are powered by supermassive black holes.
arxiv +1 more source
Fermi-LAT Detection of the Low-luminosity Radio Galaxy NGC 4278 during the LHAASO Campaign
The Astrophysical Journal LettersWe present a study of the high-energy properties of the compact symmetric object NGC 4278, recently associated with a TeV source by the Large High Altitude Air Shower Observatory (LHAASO) collaboration.
Ettore Bronzini +3 more
doaj +1 more source
Discovery of Active Galactic Nuclei in Mid- and Far-Infrared Deep Surveys with ISO [PDF]
arXiv, 2001 We present a summary on the discovery of active galactic nuclei in mid- and far-infrared deep surveys with use of the Infrared Space Observatory.
arxiv
The role of the central stellar cluster in active galactic nuclei. I. Semi-analytical model [PDF]
, 2002 The subject of the paper is the role of the massive stellar cluster in the activity phenomenon and in the structure of active galactic nuclei. We introduce a simple model of stellar dynamics in the internal part of the cluster, which allows us to include both the star-disk and the star-star interactions.
arxiv +1 more source
No Galaxy-scale [C ii] Fast Outflow in the z = 6.72 Red Quasar HSC J1205–0000
The Astrophysical JournalHSC 120505.09-000027.9 (J1205–0000) is one of the highest redshift ( z = 6.72) dust-reddened quasars (red quasars) known to date. We present an improved analysis of Atacama Large Millimeter/submillimeter Array data of the [C ii ] 158 μ m line and the ...
Mahoshi Sawamura +19 more
doaj +1 more source
Gas flows in galactic nuclei: observational constraints on BH-galaxy coevolution [PDF]
, 2016 Galaxy nuclei are a unique laboratory to study gas flows. High-resolution imaging of the gas flows in galactic nuclei are instrumental in the study of the fueling and the feedback of star formation and nuclear activity in nearby galaxies. Several fueling mechanisms can be now confronted in detail with observations done with state-of-the-art ...
arxiv +1 more source
Low-luminosity accretion in black hole X-ray binaries and active galactic nuclei [PDF]
Astrophysics and Space Science, 2005 At luminosities below a few percent of Eddington, accreting black holes switch to a hard spectral state which is very different from the soft blackbody-like spectral state that is found at higher luminosities. The hard state is well-described by a two-temperature, optically thin, geometrically thick, advection-dominated accretion flow (ADAF) in which ...
openaire +4 more sources
Black Holes in Galactic Nuclei: the Promise and the Facts [PDF]
arXiv, 2002 It has long been suspected that Active Galactic Nuclei are powered by accretion of matter onto massive black holes and this belief implies their presence in the nuclei of most nearby galaxies as "relics" of past activity. Just a few years ago this was considered a paradigm but, recently, new ground-based and Hubble Space Telescope observations are ...
arxiv
Multiple Emission Regions in Jets of the Low-Luminosity Active Galactic Nucleus in NGC 4278
The Astrophysical JournalThe Large High Altitude Air Shower Observatory (LHAASO) has detected very-high-energy gamma rays from the low-ionization nuclear emission-line region galaxy NGC 4278, which has a low-luminosity active galactic nucleus (LLAGN) and symmetric, mildly ...
Samik Dutta, Nayantara Gupta
doaj +1 more source
Self-Similar Solution of Hot Accretion Flow with Anisotropic Pressure
Universe, 2019 For the accretion flow in extremely low-luminosity active galactic nuclei, such as our Galactic center (Sgr A*) and M 87, the collisional mean-free path of ions may be much larger than its gyroradius.
De-Fu Bu, Pei-Yao Xu, Bo-Cheng Zhu
doaj +1 more source