Galactic nuclei
The central engine of Active Galactic Nuclei
... 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 with bright ...
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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 spectral ...
5
Unveiling the Structure of Active Galactic Nuclei with Hard X ray Spectroscopy
... active galactic nuclei (AGN) in the hard X-ray band (> 10 keV) results in both the least contaminated and the least obscuration-biased samples of AGN in the local ...Seyfert nuclei for short ...
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Differential Photometry of Active Galactic Nuclei using Time Resolved Observations with the 1m Nickel Telescope of Lick Observatory
... Active Galactic Nuclei (AGN) are objects that reside in the center of galaxies and exhibit energies 100 - 1000 times greater than the collective light of the host galaxies they occupy and cannot be simply ...
35
Dielectronic recombination of Fe 3pq ions: a key ingredient for describing x-ray absorption in active galactic nuclei
... The resultant total (DR+RR) rate coefficients are then an order of magnitude larger than those cur- rently in use by photoionized plasma modeling codes such as cloudy, ion and xstar. These rate coefficients, together ...
7
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 ...
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Studying the potential of the [OII] emission line as a surrogate for stellar velocity dispersion in Active Galactic Nuclei
... Active Galactic Nuclei were first observed in the form of Seyfert galaxies and Quasars, short for Quasi- stellar ...Active Galactic Nuclei or ...
35
The many lives of active galactic nuclei II: the formation and evolution of radio jets and their impact on galaxy evolution
... We describe new efforts to model radio active galactic nuclei (AGN) in a cosmological context using the Semi-Analytic Galaxy Evolution (SAGE) semi-analytic galaxy model. Our new method tracks the physical ...
13
Extragalactic Background Light expected from photon-photon absorption on spectra of distant Active Galactic Nuclei
... Active Galactic Nuclei will be observed in the energy spectrum of electromagnetic ...active galactic nuclei re- quires the detection of a large sample of very high en- ergy gamma-ray objects ...
5
Clear evidence for the early triggering of a luminous quasar-like active galactic nuclei in a major, gas-rich merger
... implying that the latest episode of star formation and quasar activity have been triggered quasi-simultaneously. The lack of reddening deduced from both continuum modelling and the measured Balmer decrements (E(B − V) ...
9
Variability of Active Galactic Nuclei From Differential Photometry
... The 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 galactic ...
37
Stellar dynamics and tidal disruption events in galactic nuclei
... This is a brief, informal review of the stellar dynamical mechanisms that play a role in the tidal destruction (TD) of stars by massive black holes (MBHs) in galactic nuclei. The key issue is to determine ...
7
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 present ...
293
Triggering active galactic nuclei in galaxy clusters
... Recent decades have brought recognition of the important role active galactic nuclei (AGN) play in regulating the cosmic star formation histories of their host galaxies and larger scale environments (e.g. ...
14
The interaction between feedback from active galactic nuclei and supernovae
... active galactic nuclei (AGN), are thought to regulate the star formation rates (SFRs) of low- and high-mass galaxies, respectively (for a review see ...
5
Time but no space : resolving the structure and dynamics of active galactic nuclei using time domain astronomy
... 47 2.12 Parameters inferred by the CREAM fits to the u, g, r, i, z light curves as a function ˙ of driving light curve power spectrum slope.. The lower plot shows the M M parameter again[r] ...
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Constraining the Size of the Dusty Torus in Active Galactic Nuclei: An Optical/Infrared Reverberation Lag Study
... Astronomers discovered in the early 20th century that certain galaxies exhibit spectral emission lines in their nuclei. Carl Seyfert in his 1943 pa- per Nuclear Emission in Spiral Nebulae (Seyfert, 1943) that in ...
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The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-Ray Background
... The measured NuSTAR counts lie significantly above simple extrapolation with a Euclidian slope to low flux of the Swift/BAT 15–55 keV number counts measured at higher fluxes S15–55 keV 10[r] ...
8
X-ray Evolution and Variability of Active Galactic Nuclei
... T he X -ray selected NELGs are probably a mixed bag of objects, and some m ay be powered by star form ation and not related to AGN activity at all. However, NELGs do appear to be undergoing evolution which (at least at ...
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Guillard, Nicolas (2018): Growth and fuelling of galactic nuclei. Dissertation, LMU München: Fakultät für Physik
... Perhaps one of the most interesting behavior of nuclear clusters (aside from their unique location in the galactic disc) is their apparent co-evolution with their host galaxy. Indeed, it has been pointed out that ...
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