active galactic nuclei (AGN)
Unveiling the Structure of Active Galactic Nuclei with Hard X ray Spectroscopy
... of active galactic nuclei (AGN) is thought to be produced in the immediate vicinity of the central black ...of AGN coronae are currently poorly constrained due to the lack of direct ...
291
The central engine of Active Galactic Nuclei
... of Active Galactic Nuclei (AGN) began in the early 1940’s with the advancement in radio astronomy, the detection of powerful radio sources and radio jets, and the discovery of spiral Galaxies ...
201
Variability of Active Galactic Nuclei From Differential Photometry
... Seoul AGN Monitoring Project, or SAMP for short, is an international project (PI Jonghak Woo from Korea) with the goal of measuring the masses of black holes residing in the center of massive active ...
37
A multifrequency study of X-ray selected active galactic nuclei from the HEAO-1 survey
... both galactic and extragalactic ...diffuse galactic emission and a new class of “super luminous” infrared galaxy emit ting greater than 95% of their luminosity in the infrared (see Beichman 1987, Soifer et ...
334
Triggering active galactic nuclei in galaxy clusters
... role active galactic nuclei (AGN) play in regulating the cosmic star formation histories of their host galaxies and larger scale environments ...between AGN presence and host galaxy ...
14
Relationship Between Spectral Indices and Flux Variability of the Active Galactic Nuclei 3C 273
... 3C 273, one of the best monitored active galactic nuclei (AGNs), has been observed for more than one hundred years. The multi-wavelength spectral variability of 3C 273 are variable with time. The ...
5
Extragalactic Background Light expected from photon-photon absorption on spectra of distant Active Galactic Nuclei
... As the TeV gamma rays can be absorbed due to interac- tion of low-energy photons of Extragalactic Background Light (EBL), the observations of active galactic nuclei can also be used for the study ...
5
Aspects of Supermassive Black Hole Growth in Nearby Active Galactic Nuclei
... Super-massive black holes (SBHs) have long been identified as the en- gines of active galactic nuclei (AGNs) and are now considered to play a key role in galaxy evolution. In this dissertation I ...
293
The broad line region of active galactic nuclei: A self-consistent 3-dimensional model
... T he ionization param eter and density were normalized to U = 10“ ^ and N = 10^^ cm “ ^ at a radius of 10 light-days, typical of the lag between th e continuum and emission-line variations found for a number of low ...
298
Are luminous radio-loud active galactic nuclei triggered by galaxy interactions?
... Thus, if we only consider the galaxies classified in groups 1, 2 and 3, we find that 62 per cent of the PRGs at z < 0.2 show signs of interactions. However, it is worth considering the percentage of dis- turbance ...
19
A semi-analytic model for the co-evolution of galaxies, black holes and active galactic nuclei
... and AGN in the context of CDM-based semi-analytic models of varying complex- ity (Efstathiou & Rees 1988; Kauffmann & Haehnelt 2000; Wyithe & Loeb 2002; Bromley et ...of AGN feedback on galaxy ...
33
The role of environment in the observed Fundamental Plane of radio active galactic nuclei
... trace AGN bolometric luminosity (Heckman et ...the AGN-only ...luminosity AGN (LINERs) by Nisbet & Best ...these AGN are found in different accretion modes, and have different scalings ...
7
Galaxy and Mass Assembly (GAMA): active galactic nuclei in pairs of galaxies
... an AGN to be of a particu- lar type dependent upon the presence or absence of a nearby galaxy, Villarroel & Korn (2014) have conducted a thorough census of the properties of AGN ...in ...
16
Metals in the circumgalactic medium are out of ionization equilibrium due to fluctuating active galactic nuclei
... recent AGN activity is required to account for the degree of ionization of the emitting ...the Galactic Centre roughly ∼1 Myr ago ...Furthermore, AGN variability has been invoked to explain the ...
19
Delayed triggering of radio active galactic nuclei in gas rich minor mergers in the local Universe
... (2012) AGN classification was based on radio continuum imaging rather than optical emission-line luminosity, potentially probing a later phase in post-merger evo- lution of the host galaxy (Cowley et ...older ...
15
Studying the potential of the [OII] emission line as a surrogate for stellar velocity dispersion in Active Galactic Nuclei
... To better understand the differences between the [OII] and [OIII] emission lines we perform an initial visual inspection of the emission lines for each galaxy. We first look for asymmetric line profiles, indicating red ...
35
Time but no space : resolving the structure and dynamics of active galactic nuclei using time domain astronomy
... In addition to applying this technique to actual light curves (see following chapters), and making the code sufficiently user friendly to be publicly available, I would like to overcome one of the assumptions CREAM makes ...
208
Constraining the Size of the Dusty Torus in Active Galactic Nuclei: An Optical/Infrared Reverberation Lag Study
... for AGN Reverberations (SPEAR) method provides a statistical framework for determining time lags under the assumption that the underlying physical variable process has an exponential correlation function ...
200
X-ray Evolution and Variability of Active Galactic Nuclei
... line AGN is shown for z < ...of AGN if th e local NELG population is (at least in p a rt) descended from ...line AGN when they are at higher X -ray lum inosities, this lack of high redshift NELGs ...
206
X-ray and optical studies of active galactic nuclei
... in AGN are thought to arise in two physically distinct regions, called the Broad line region (BLR) and the Narrow line region (NLR) ...the AGN (~ ...the AGN (see ...of AGN can throw some light ...
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