Results 51 to 60 of about 4,398,607 (320)
High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects
Galaxies, 2023 Observational studies of GHz peaked spectrum (GPS) sources contribute to the understanding of the radiative properties and interstellar environment of host galaxies.
Xiaopeng Cheng +3 more
doaj +1 more source
THE BLACK HOLE MASS SCALE OF CLASSICAL AND PSEUDO BULGES IN ACTIVE GALAXIES [PDF]
, 2014 The mass estimator used to calculate black hole (BH) masses in broad-line active galactic nuclei (AGNs) relies on a virial coefficient (the “f factor”) that is determined by comparing reverberation-mapped (RM) AGNs with measured bulge stellar velocity ...
L. Ho +5 more
semanticscholar +1 more source
Spectral Properties of AGN with Very Weak [O III] Lines [PDF]
Serbian Astronomical Journal, 2011 The spectral properties of a sample of 58 Active GalacticNuclei (AGN) spectra, in which emission [O~III] $lambdalambda$4959, 5007 AA lines are weak or totally absent, are analyzed.
Kovacevic, J.
doaj +3 more sources
The host galaxies of active galactic nuclei
, 2003 We examine the properties of the host galaxies of 22 623 narrow-line active galactic nuclei (AGN) with 0.02 < z < 0.3 selected from a complete sample of 122 808 galaxies from the Sloan Digital Sky Survey.
G. Kauffmann +12 more
semanticscholar +1 more source
Starburst–AGN mixing – II. Optically selected active galaxies [PDF]
, 2014 We use 4 galaxies from the Calar Alto Legacy Integral Field Area (CALIFA) survey with clear signs of accretion onto supermassive black holes to investigate the relative contribution of star-formation and active galactic nucleus (AGN) activity to the line-
R. Davies, L. Kewley, I. Ho, M. Dopita
semanticscholar +1 more source
Larger $λ_R$ in the disc of isolated active spiral galaxies than in their non-active twins [PDF]
A&A 639, L9 (2020), 2020 We present a comparison of the spin parameter $\lambda_R$, measured in a region dominated by the galaxy disc, between 20 pairs of nearby (0.005$<$z$<$0.03) seemingly isolated twin galaxies differing in nuclear activity. We find that 80--82% of the active galaxies show higher values of $\lambda_R$ than their corresponding non-active twin(s), indicating ...
arxiv +1 more source
Galaxy Evolution in the Radio Band: The Role of Star-forming Galaxies and Active Galactic Nuclei [PDF]
, 2017 We investigate the astrophysics of radio-emitting star-forming galaxies and active galactic nuclei (AGNs) and elucidate their statistical properties in the radio band, including luminosity functions, redshift distributions, and number counts at sub-mJy ...
C. Mancuso +8 more
semanticscholar +1 more source
The host galaxies and classification of active galactic nuclei [PDF]
, 2006 We present an analysis of the host properties of 85224 emission-line galaxies selected from the Sloan Digital Sky Survey. We show that Seyferts and LINERs form clearly separated branches on the standard optical diagnostic diagrams.
L. Kewley +5 more
semanticscholar +1 more source
Dichotomy in host environments and signs of recycled AGN [PDF]
, 2009 We analyse the relation between AGN host properties and large scale environment for a representative red and blue AGN host galaxy sample selected from the DR4 SDSS. A comparison is made with two carefully constructed control samples of non-active galaxies, covering the same redshift range and color baseline.
arxiv +1 more source
The star formation rates of active galactic nuclei host galaxies [PDF]
, 2016 Using artificial neural network (ANN) predictions of total infra-red luminosities (LIR), we compare the host galaxy star formation rates (SFRs) of ~21,000 optically selected active galactic nuclei (AGN), 466 low excitation radio galaxies (LERGs) and 721 ...
S. Ellison +3 more
semanticscholar +1 more source