Results 11 to 20 of about 126,286 (222)
High Redshift Quasars, Emission Lines and ‘Cloudy’
Open Astronomy, 2011 I describe some of the outstanding “big picture” questions in quasar research and how the development of the plasma simulation code Cloudy is being guided to answer them.
Ferland Gary J.
doaj +1 more source
Nanomaterials, 2018 Resveratrol (RSV) and the ethanol extract of Angelica gigas Nakai (AGN Ex)-based nanoparticles (NPs) were prepared using the nanocrystal concept. AGN/RSV NPs with 224 nm hydrodynamic size, unimodal size distribution, and negative zeta potential values ...
Suyeong Nam +3 more
doaj +1 more source
The cosmic evolution of radio-AGN feedback to z=1 [PDF]
, 2014 This paper presents the first measurement of the radio luminosity function of 'jet-mode' (radiatively-inefficient) radio-AGN out to z=1, in order to investigate the cosmic evolution of radio-AGN feedback.
Best, P. N. +4 more
core +1 more source
The starburst-AGN connection: the role of stellar clusters in AGNs [PDF]
Astrophysics and Space Science, 2008 Nuclear stellar clusters are a common phenomenon in spirals and in starbursts galaxies, and they may be a natural consequence of the star formation processes in the central regions of galaxies. HST UV imaging of a few Seyfert 2 galaxies have resolved nuclear starbursts in Seyfert 2 revealing stellar clusters as the main building blocks of the extended ...
Delgado, R. M. González +4 more
openaire +2 more sources
Open Astronomy, 2011 Multiple images of quasars formed by gravitational lensing are typically seen through the lensing galaxy. The granulation of the galaxy in stars or other compact objects induces local (‘microscopic’) but strong fluctuations in the gravitational potential
Gradolph Teresa Mediavilla +2 more
doaj +1 more source
Mid-Infrared Spectral Diagnostics of Luminous Infrared Galaxies [PDF]
, 2010 We present a statistical analysis of the mid-infrared (MIR) spectra of 248 luminous infrared (IR) galaxies (LIRGs) which comprise the Great Observatories All-sky LIRG Survey (GOALS) observed with the Infrared Spectrograph (IRS) on-board the Spitzer Space
Appleton, P. +24 more
core +3 more sources
Multiband Study of Radio Sources of the RCR Catalogue with Virtual Observatory Tools
Open Astronomy, 2012 We present early results of our multiband study of the RATAN Cold Revised (RCR) catalogue obtained from seven cycles of the “Cold” survey carried with the RATAN-600 radio telescope at 7.6 cm in 1980-1999, at the declination of the SS 433 source.
Zhelenkova O. P. +3 more
doaj +1 more source
Emission-line Diagnostics of Low Metallicity AGN [PDF]
, 2006 Current emission-line based estimates of the metallicity of active galactic nuclei (AGN) at both high and low redshifts indicate that AGN have predominantly solar to supersolar metallicities. This leads to the question: do low metallicity AGN exist?
Groves, Brent +2 more
core +3 more sources
On the Heating of AGN Magnetospheres [PDF]
Universe, 2021 The Langmuir–Landau-Centrifugal Drive (LLCD), which can effectively “convert” gravitational energy into particles, is explored as a driving mechanism responsible for the extreme thermal luminosity acquired by some active galactic nuclei (AGN). For this purpose, we consider equations governing the process of heating of AGN magnetospheres. In particular,
Zaza Osmanov, Swadesh Mahajan
openaire +3 more sources
, 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