Results 41 to 50 of about 141,201 (236)
, 2001 Active Galactic Nuclei are fueled from material (gas or stars) that are in general far away from the gravitational influence of the central black hole, the engine thought to be responsible for their activity. The required material has a lot of angular momentum, that is a priori quite difficult to evacuate. The various dynamical mechanisms that may play
openaire +2 more sources
Are the hosts of VLBI selected radio-AGN different to those of radio-loud AGN?
, 2016 Recent studies have found that radio-AGN selected by radio-loudness show little difference in terms of their host galaxy properties when compared to non-AGN galaxies of similar stellar mass and redshift.
Herrera-Ruiz, N. +4 more
core +1 more source
The Astrophysical Journal Supplement SeriesWe present the active galactic nuclei (AGN) catalog from the fourth data release (HDR4) of the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey.
Chenxu Liu +9 more
doaj +1 more source
M-σ relations across cosmic time
The Open Journal of Astrophysics, 2023 Feedback from active galactic nuclei (AGN) has long been invoked to explain the correlation between black hole mass and stellar velocity dispersion (M-σ) discovered in low redshift galaxies. We describe the time evolution of AGN in the M-σ plane based on
David Garofalo +5 more
doaj +1 more source
Origin and properties of dual and offset active galactic nuclei in a cosmological simulation at z=2
, 2016 In the last few years, it became possible to observationally resolve galaxies with two distinct nuclei in their centre. For separations smaller than 10kpc, dual and offset active galactic nuclei (AGN) are distinguished: in dual AGN, both nuclei are ...
Comerford, Julia M. +5 more
core +2 more sources
The Open Journal of AstrophysicsGalaxy mergers have been shown to trigger AGN in the nearby universe, but the timescale over which this process happens remains unconstrained. The Multi-Model Merger Identifier (MUMMI) machine vision pipeline has been demonstrated to provide reliable ...
Sara Ellison +8 more
doaj +1 more source
First Measurement of a Rapid Increase in the AGN Fraction in High-Redshift Clusters of Galaxies
, 2007 We present the first measurement of the AGN fraction in high-redshift clusters of galaxies (z~0.6) with spectroscopy of one cluster and archival data for three additional clusters.
Daniel D. Kelson +7 more
core +1 more source
Decoding spectral energy distributions of dust-obscured starburst-AGN
, 2012 We present BayeSED, a general purpose tool for doing Bayesian analysis of SEDs by using whatever pre-existing model SED libraries or their linear combinations.
Asensio Ramos +24 more
core +1 more source
Extragalactic gamma-ray background from AGN winds and star-forming galaxies in cosmological galaxy formation models [PDF]
, 2017 We derive the contribution to the extragalactic gamma-ray background (EGB) from AGN winds and star-forming galaxies by including a physical model for the gamma-ray emission produced by relativistic protons accelerated by AGN-driven and supernova-driven ...
Antonelli, L. A. +6 more
core +2 more sources
The First Triple Radio Active Galactic Nucleus in an Ongoing Galaxy Merger
The Astrophysical Journal LettersGalaxy mergers are predicted to be a critical stage of merger-driven SMBH growth and galaxy evolution. Systems exhibiting multiple active galactic nuclei (AGN) are an important observational tool for constraining the prevalence and properties of merging ...
Emma Schwartzman +9 more
doaj +1 more source