Results 21 to 30 of about 102,749 (268)

Supermassive Black Holes in Active Galactic Nuclei. I. The Consistency of Black Hole Masses in Quiescent and Active Galaxies [PDF]

, 2001
We report the first results of a program to measure accurate stellar velocity dispersions in the bulges of the host galaxies of active galactic nuclei (AGNs) for which accurate black hole (BH) masses have been determined via reverberation mapping.
Amri Wandel, Bender R., Bender R., Bradley M. Peterson, Charles L. Joseph, David Merritt, Krolik J., Laura Ferrarese, Richard W. Pogge, Richstone D., Silk J., Wandel A.   +11 more
core   +2 more sources

Nuclear activity in isolated galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
7 figures, 7 ...
Hernández-Ibarra, Francisco J., Dultzin, Deborah, Krongold, Yair, Olmo, Ascensión del, Perea, Jaime, González, Jesús   +5 more
openaire   +3 more sources

The triggering probability of radio-loud AGN: A comparison of high and low excitation radio galaxies in hosts of different colors [PDF]

, 2012
Low luminosity radio-loud active galactic nuclei (AGN) are generally found in massive red elliptical galaxies, where they are thought to be powered through gas accretion from their surrounding hot halos in a radiatively inefficient manner.
Abazajian, Baldwin, Balogh, Becker, Best, Best, Best, Best, Brinchmann, Condon, Croton, Evans, H. J. A. Röttgering, Hardcastle, Hickox, J. Brinchmann, Kauffmann, Kauffmann, Kauffmann, Martin, Matthews, P. N. Best, R. M. J. Janssen, Schmidt, Stoughton, Strateva, Strauss, Tadhunter, Tasse, Whysong, York   +30 more
core   +3 more sources

Are radio galaxies and quiescent galaxies different? Results from the analysis of HST brightness profiles

, 2005
We present a study of the optical brightness profiles of early type galaxies, using a number of samples of radio galaxies and optically selected elliptical galaxies.
A. Capetti, Bender, Bender, Bender, Bettoni, Bettoni, Byun, Capetti, Capetti, Carollo, Carollo, Chiaberge, Crane, De Koff, de Ruiter, de Ruiter, Djorgovski, Dressler, Faber, Fanti, Ferrarese, Gebhardt, Gonzalez-Serrano, Gonzalez-Serrano, Graham, Graham, H. R. de Ruiter, Jaffe, Kormendy, L. Santantonio, Laine, Lauer, Lauer, Lauer, Lauer, Lucy, Magorrian, Martel, McLure, McLure, Milosavljevic, Morganti, Morganti, P. Parma, Parma, Parma, Parma, Pellegrini, R. Fanti, R. Morganti, Ravindranath, Rest, Richardson, Sandage, Smith, Trujillo, van der Marel, Verdoes Kleijn, Wandel, Wilson, Woo   +60 more
core   +1 more source

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

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

Compact jets as probes for sub-parsec scale regions in AGN

, 2007
Compact relativistic jets in active galactic nuclei offer an effective tool for investigating the physics of nuclear regions in galaxies. The emission properties, dynamics, and evolution of jets in AGN are closely connected to the characteristics of the ...
A. Celotti, A. Königl, A. Königl, A. Merloni, A. Pedlar, A.B. Peck, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Marscher, A.P. Marscher, A.P. Marscher, Andrei Lobanov, C.G. Mundell, D.J. Hutter, D.L. Meier, D.L. Meier, G.B. Field, H.C. Spruit, H.J. Lehto, H.R. Klöckner, I.V. Igumenschev, J.A. Zensus, J.E. Conway, J.F.C. Wardle, J.R. Goicoechea, K. Hirotani, M. Camenzind, M. Hujeirat, M. Sikora, M.J. Valtonen, N. Vlahakis, N.S. Kardashev, P.B. Ivanov, P.B. Ivanov, R.C. Walker, R.D. Blandford, R.D. Blandford, S. Koide, S.D. Bloom, S.S. Komissarov, S.V. Bogovalov, T.G. Arshakian, U. Bach, W. Junor   +49 more
core   +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., Coziol, R., Plauchu-Frayn, I.   +2 more
core   +2 more sources

Comparison of bar strengths in active and non-active galaxies

, 2001
Bar strengths are compared between active and non-active galaxies for a sample of 43 barred galaxies. The relative bar torques are determined using a new technique (Buta and Block 2001), where maximum tangential forces are calculated in the bar region ...
Athanassoula E., Buta R., Combes F., Combes F., Eija Laurikainen, Englmaier P., Heikki Salo, Lutticke R., Maiolino R., Marquez I., Martinet L., Patsis P. A., Persic M., Pfenniger D., Ronald Buta   +14 more
core   +1 more source

LABOCA observations of nearby, active galaxies [PDF]

, 2008
We present large scale 870 micron maps of the nearby starburst galaxies NGC253, NGC4945 and the nearest giant elliptical radio galaxy Centaurus A (NGC 5128) obtained with the newly commissioned Large Apex Bolometer Camera (LABOCA) operated at the APEX ...
A. Kovács, A. Weiß, Alton, Block, Brock, Brookes, Burns, Chou, Condon, Cox, Dahlem, Dahlem, Draine, Dumke, E. Kreysa, Eckhart, Engelbracht, F. Schuller, Fabbiano, G. Siringo, Gardner, Güsten, Hardcastle, Hardcastle, Harrison, Houghton, Israel, K. M. Menten, Karachentsev, Koribalski, Krügel, Krügel, Leeuw, Madejski, Mauersberger, McCaarthy, Melo, Mirabel, Ott, Pilyugin, Priddey, R. Güsten, Radovich, Rekola, Rieke, Sakamoto, Siebenmorgen, Siringo, Sorai, Unger, Wang   +50 more
core   +1 more source