Results 41 to 50 of about 184,376 (200)
The role of AGN jets in the reionization epoch [PDF]
A&A 617, L3 (2018), 2018 The reionization of the Universe ends the dark ages that started after the recombination era. In the case of H, reionization finishes around $z\sim 6$. Faint star-forming galaxies are the best candidate sources of the H-ionizing radiation, although active galactic nuclei may have also contributed. We have explored whether the termination regions of the
arxiv +1 more source
Polarized Broad‐Line Emission from Low‐Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 1999 28 pages, including 3 tables and 16 figures. Uses the emulateapj latex style file.
Alexei V. Filippenko +2 more
openaire +3 more sources
The Astrophysical Journal, 2023 The early-type galaxy NGC 5195 (alternatively known as M51b) possesses extended gas features detected in the multiwavelength, postulated to be associated with previous activities of the central supermassive black hole.
Xiaoyu Xu, Junfeng Wang
doaj +1 more source
THE DISK EVAPORATION MODEL FOR THE SPECTRAL FEATURES OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2013 Observations show that the accretion flows in low-luminosity active galactic nuclei (LLAGNs) probably have a two-component structure with an inner ADAF and an outer truncated accretion disk. As shown by Taam et al. (2012), the truncation radius as a function of mass accretion rate is strongly affected by including the magnetic field within the ...
Francesca Panessa +3 more
openaire +3 more sources
Detection of a ∼0.1c Radio Knot in M81* Associated with a Moderate X-Ray Flare
The Astrophysical Journal, 2023 Through very long baseline interferometry observations of one of the closest low-luminosity active galactic nuclei, M81*, at multiple frequencies of 8.8, 22, and 44 GHz, a bright discrete knot with an unusual low apparent speed ∼0.1 c was detected ...
Xuezheng Wang +6 more
doaj +1 more source
The Toroidal Obscuration of Active Galactic Nuclei [PDF]
, 2008 Observations give strong support for the unification scheme of active galactic nuclei. The scheme is premised on toroidal obscuration of the central engine by dusty clouds that are individually very optically thick. These lectures summarize the torus properties, describe the handling and implications of its clumpy nature and present speculations about ...
arxiv +1 more source
On the Subparsec-scale Core Composition of FR 0 Radio Galaxies
The Astrophysical Journal Letters, 2023 Although Fanaroff–Riley type 0 (FR 0) radio galaxies are known to be the most numerous jet population in the local Universe, they are much less explored than the well-established class of FR type I (FR I) and FR type II galaxies due to their intrinsic ...
Margot Boughelilba, Anita Reimer
doaj +1 more source
Origin of Radio Emission from Nearby Low‐Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2005 25 pages, some references were added, accepted for publication in ...
Xinwu Cao, Qingwen Wu
openaire +4 more sources
The Correlation between X-ray spectral slope and FeKalpha line energy in radio-quiet active galactic nuclei [PDF]
Astrophys.J. 581 (2002) L71-L76, 2002 A significant correlation between FeKalpha line energy and X-ray spectral slope has been discovered among radio-quiet active galactic nuclei. The ionization stage of the bulk of the FeKalpha emitting material is not the same in all active galactic nuclei and is related to the shape of the X-ray continua.
arxiv +1 more source
Quiescent and active galactic nuclei as factories of merging compact objects in the era of gravitational-wave astronomy [PDF]
, 2023 Galactic nuclei harbouring a central supermassive black hole (SMBH), possibly surrounded by a dense nuclear cluster (NC), represent extreme environments which house a complex interplay of many physical processes that uniquely affect stellar formation, evolution, and dynamics. The discovery of gravitational waves (GW) emitted by merging black holes (BHs)
arxiv +1 more source