Results 41 to 50 of about 90,767 (300)

Galaxies hosting an active galactic nucleus: a view from the CALIFA survey [PDF]

, 2019
We study the presence of optically-selected Active Galactic Nuclei (AGNs) within a sample of 867 galaxies extracted from the extended {\it Calar-Alto Legacy Integral Field spectroscopy Area} (eCALIFA) spanning all morphological classes.
E. Lacerda, S. S'anchez, R. Cid Fernandes, C. López-Cobá, C. Espinosa-Ponce, L. Galbany   +5 more
semanticscholar   +1 more source

AN OFF-CENTERED ACTIVE GALACTIC NUCLEUS IN NGC 3115 [PDF]

The Astrophysical Journal, 2014
NGC 3115 is an S0 galaxy that has always been considered to have a pure absorption-line spectrum. Some recent studies have detected a compact radio-emitting nucleus in this object, coinciding with the photometric center and with a candidate for the X-ray nucleus. This is evidence of the existence of a low-luminosity active galactic nucleus (AGN) in the
R. B. Menezes, J. E. Steiner, T. V. Ricci   +2 more
openaire   +2 more sources

ALMA captures feeding and feedback from the active galactic nucleus in NGC 613 [PDF]

Astronomy & Astrophysics, 2019
We report ALMA observations of CO(3–2) emission in the Seyfert/nuclear starburst galaxy NGC 613, at a spatial resolution of 17 pc, as part of our NUclei of GAlaxies (NUGA) sample.
A. Audibert, F. Combes, S. García-Burillo, L. Hunt, A. Eckart, S. Aalto, V. Casasola, F. Boone, M. Krips, S. Viti, Sebastien Muller, K. Dasyra, P. Werf, Sarah Martin   +13 more
semanticscholar   +1 more source

A quasi-periodic oscillation in the blazar J1359+4011 [PDF]

, 2013
The OVRO 40-m telescope has been monitoring the 15 GHz radio flux density of over 1200 blazars since 2008. The 15 GHz light curve of the flat spectrum radio quasar J1359+4011 shows a strong and persistent quasi-periodic oscillation. The time-scale of the
Hovatta, T., King, O. G., Max-Moerbeck, W., Meier, D. L., Pearson, T. J., Readhead, A. C. S., Reeves, R., Richards, J. L., Shepherd, M. C.   +8 more
core   +4 more sources

ACTIVE GALACTIC NUCLEUS PAIRS: CHANCE SUPERPOSITIONS OR BLACK HOLE BINARIES? [PDF]

The Astrophysical Journal, 2010
Several active galactic nuclei (AGNs) with multiple sets of emission lines (ELs) separated by over 2000 km s-1 have been observed recently. These have been interpreted as being due to massive black hole (MBH) recoil following a black hole merger, MBH binaries, or chance superpositions of AGNs in galaxy clusters. Moreover, a number of double-peaked AGNs
Dotti, M, Ruszkowski, M
openaire   +3 more sources

The parsec scale region of Active Galactic Nuclei in the IR [PDF]

, 2004
First results from the AGN-Heidelberg program aimed at spatially resolving the central pc region of the closest Active Galactic Nuclei are presented. The core region of prototype active nuclei are clearly unveiled at IR waves and at distances from the ...
Meisenheimer, Klaus, Prieto, M. Almudena
core   +2 more sources

Magnetic acceleration of relativistic active galactic nucleus jets [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
We present numerical simulations of axisymmetric, magnetically driven relativistic jets. Our special-relativistic, ideal-magnetohydrodynamics numerical scheme is specifically designed to optimize accuracy and resolution and to minimize numerical dissipation.
Komissarov, S.S., Barkov, M.V., Vlahakis, N., Königl, A.   +3 more
openaire   +2 more sources

A Possible ∼20 yr Periodicity in Long-term Optical Photometric and Spectral Variations of the Nearby Radio-quiet Active Galactic Nucleus Ark 120 [PDF]

Astrophysical Journal Supplement Series, 2017
We study the long-term variability in the optical monitoring database of Ark 120, a nearby radio-quiet active galactic nucleus (AGN) at a distance of 143 Mpc (z = 0.03271). We compiled the historical archival photometric and spectroscopic data since 1974
Yan-Rong Li, Jian-Min Wang, Zhi-Xiang Zhang, Kai Wang, Ying-Ke Huang, K. Lu, Chen Hu, P. Du, E. Bon, L. Ho, J. Bai, W. Bian, Ye-Fei Yuan, H. Winkler, E. Denissyuk, R. Valiullin, N. Bon, L. Popović   +17 more
semanticscholar   +1 more source

THE IMPACT OF GALAXY INTERACTIONS ON ACTIVE GALACTIC NUCLEUS ACTIVITY IN zCOSMOS [PDF]

The Astrophysical Journal, 2011
Close encounters between galaxies are expected to be a viable mechanism, as predicted by numerical simulations, by which accretion onto supermassive black holes can be initiated. To test this scenario, we construct a sample of 562 galaxies (M_* > 2.5 × 10^(10) M_☉) in kinematic pairs over the redshift range 0.25 2 × 10^(42) erg s^(–1)) detected by ...
Maier, C., Mignoli, M., Pello, R., Pérez-Montero, E., Ricciardelli, E., Peng, Y., Scodeggio, M., Tanaka, M., Tasca, L., Tresse, L., Vergani, D., Zucca, E., Brusa, M., Cappelluti, N., Comastri, A., Finoguenov, A., Fu, H., Gilli, R., Hao, H., Ho, L.~c., Salvato, M., Silverman, J.~d., Kampczyk, P., Jahnke, K., Andrae, R., Lilly, S.~j., Elvis, M., Civano, F., Mainieri, V., Vignali, C., Zamorani, G., Nair, P., Le Fèvre, O., Ravel, L., Bardelli, S., Bongiorno, A., Bolzonella, M., Cappi, A., Caputi, K., Carollo, C.~m., Contini, T., Coppa, G., Cucciati, O., Torre, S., Franzetti, P., Garilli, B., Halliday, C., Hasinger, G., Iovino, A., Knobel, C., Koekemoer, A.~m., Kovač, K., Lamareille, F., Le Borgne, J.-F., Le Brun, V.   +54 more
openaire   +5 more sources

Active galactic nucleus and dwarf galaxy gas kinematics [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT We present spatially resolved kinematic measurements of stellar and ionized gas components of dwarf galaxies in the stellar mass range $10^{8.5}\!-\!10^{10} \, \mathrm{M}_{\odot }$, selected from Sloan Digital Sky Survey DR7 and DR8 and followed up with Keck/Low-Resolution Imaging Spectrometer spectroscopy.
Christina M Manzano-King, Gabriela Canalizo   +1 more
openaire   +1 more source