Results 1 to 10 of about 178,844 (250)
Ionizing Spotlight of Active Galactic Nucleus [PDF]
Galaxies, 2023 Ionization cones and relativistic jets give us one of the most large-scale example of active galactic nuclei (AGN) influence on the surrounding gas environment in galaxies and beyond.
Alexei V. Moiseev +1 more
doaj +4 more sources
Neural Networks and the Classification of Active Galactic Nucleus Spectra [PDF]
Publications of the Astronomical Society of Australia, 1996 The use of Artificial Neural Networks (ANNs) as a classifier of digital spectra is investigated. Using both simulated and real data, it is shown that neural networks can be trained to discriminate between the spectra of different classes of active galactic nucleus (AGN) with realistic sample sizes and signal-to-noise ratios.
Daya M. Rawson +2 more
arxiv +6 more sources
NGC 4151 - A unified active galactic nucleus [PDF]
arXiv, 1996 We present a unified picture of active galactic nuclei which we construct from a detailed model of line emission in the active source in NGC 4151. In this scheme NGC 4151 can be regarded as a typical active nucleus, special only in its orientation. This alleviates a number of problems with a unified picture based on a dusty molecular torus with a fixed
I. Cassidy, Derek Raine
arxiv +5 more sources
Active galactic nucleus feedback in clusters of galaxies. [PDF]
Proc Natl Acad Sci U S A, 2010 Observations made during the last ten years with the Chandra X-ray Observatory have shed much light on the cooling gas in the centers of clusters of galaxies and the role of active galactic nucleus (AGN) heating. Cooling of the hot intracluster medium in cluster centers can feed the supermassive black holes found in the nuclei of the dominant cluster ...
Blanton EL +4 more
europepmc +6 more sources
Active Galactic Nucleus Quenching in Simulated Dwarf Galaxies
The Astrophysical Journal, 2023 We examine the quenching characteristics of 328 isolated dwarf galaxies $\left({10}^{8}\lt {M}_{\mathrm{star}}/{M}_{\odot }\lt {10}^{10}\right)$ within the Romulus25 cosmological hydrodynamic simulation.
Ray S. Sharma +4 more
doaj +2 more sources
The Fundamental Plane Evolution of Active Galactic Nucleus Host Galaxies [PDF]
The Astrophysical Journal, 2004 We measured the stellar velocity dispersions of 15 active galactic nucleus (AGN) host galaxies at redshifts as high as $\sim 0.34$. Combining these with published velocity dispersion measurements from the literature, we study the Fundamental Plane of AGN host galaxies and its evolution.
Jong‐Hak Woo +4 more
openalex +6 more sources
An Active Galactic Nucleus Identification for 3EG J2006−2321 [PDF]
The Astrophysical Journal, 2002 We present a multiwavelength analysis of the high-energy gamma-ray source 3EG J2006-2321 (l = 1882, b = -2626). The flux of this source above 100 MeV is shown to be variable on timescales of days and months. Optical observations and careful examination of archived radio data indicate that its most probable identification is with PMN J2005-2310, a flat ...
Paul Wallace +3 more
openalex +3 more sources
Extreme variability in an active galactic nucleus: Gaia16aax [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We present the results of a multiwavelength follow-up campaign for the luminous nuclear transient Gaia16aax, which was first identified in 2016 January. The transient is spatially consistent with the nucleus of an active galaxy at z = 0.25, hosting a black hole of mass ${\sim }6\times 10^8\, \mathrm{M}_\odot$.
Jussi Harmanen +22 more
openaire +7 more sources
Molecular emission in the active galactic nucleus of NGC 1068 [PDF]
Proceedings of the International Astronomical Union, 2004 E. Galliano, D. Alloin
openalex +3 more sources
X-ray Insight into High-Energy Processes in Extreme Galactic Nuclear Environment
Universe, 2022 Nuclear regions of galaxies apparently play a disproportionately large role in regulating their formation and evolution. How this regulation works, however, remains very uncertain.
Q. Daniel Wang
doaj +1 more source