Results 21 to 30 of about 102,425 (297)
Spectral properties of AGN with very weak [O III] lines [PDF]
Serbian Astronomical Journal, 2011 The spectral properties of a sample of 58 Active Galactic Nuclei (AGN) spectra, in which emission [O III] λλ4959, 5007 Å lines are weak or totally absent, are analyzed.
Kovačević J.
doaj +3 more sources
Nuclear Activity and the Dynamics of Elliptical Galaxies
, 2004 This paper looks for any correlation between the internal dynamics of elliptical galaxies and the relatively mild nuclear activity found in many such systems.
Bender +13 more
core +2 more sources
Are galaxies with AGN a transition population?
, 2007 We present the results of an analysis of a well-selected sample of galaxies with active and inactive galactic nuclei from the Sloan Digital Sky Survey, in the range 0.01 < z < 0.16. The SDSS galaxy catalogue was split into two classes of active galaxies,
Adelman-McCarthy +62 more
core +2 more sources
Mechanical heating by active galaxies [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2005 Jets and winds are significant channels for energy loss from accreting black holes. These outflows mechanically heat their surroundings, through shocks as well as gentler forms of heating. We discuss recent efforts to understand the nature and distribution of mechanical heating by central active galactic nuclei (AGN) in clusters of ...
Begelman, M, Ruszkowski, M
openaire +4 more sources
AGN spiral galaxies in groups: effects of bars [PDF]
, 2014 We explore properties of barred active spiral galaxies in groups selected from the SDSS-DR7, with the aim of assessing the effects of bars on AGN and the role of the high density environment.
Alonso, Sol +2 more
core +4 more sources
Deficiency of `Thin' Stellar Bars in Seyfert Host Galaxies [PDF]
, 2000 Using all available major samples of Seyfert galaxies and their corresponding control samples of closely matched non-active galaxies, we find that the bar ellipticities (or axial ratios) in Seyfert galaxies are systematically different from those in non ...
Knapen, Johan H. +2 more
core +3 more sources
Black hole masses in active galaxies [PDF]
, 2004 This contribution reviews two topics of current interest in the study of black hole demographics in active galaxies: Can the stellar velocity dispersions of quasar host galaxies be measured?
Barth, Aaron J.
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Discovery of a soft X-ray lag in the tidal disruption event AT2021ehb
Astronomy & AstrophysicsIn this Letter, we report the detection of soft X-ray time lags – i.e., variability in the softer photons lagging behind that in the harder photons – in seven XMM–Newton observations of the tidal disruption event (TDE) candidate AT2021ehb.
Zhang Wenjie
doaj +1 more source
Galaxies, 2021 Radio galaxies are known to undergo phases of activity, where the stage after the jets have switched off is referred to as the remnant phase. This state can be followed by a restarted phase when the activity reignites. Remnant and restarted radio sources
Nika Jurlin +3 more
doaj +1 more source
Infrared Surface Brightness Analysis of Galaxies in Compact Groups
, 2006 Images of 7 Compact groups of galaxies (CG) were obtained using the 2.1m telescope in San Pedro Martir (B.C. Mexico) equipped with the NIR camera CAMILA.
Bravo-Alfaro, H. +2 more
core +2 more sources