Results 31 to 40 of about 38,366 (276)

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

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

A direct image of the obscuring disk surrounding an active galactic nucleus [PDF]

, 1997
Active galactic nuclei (AGN) are generally accepted to be powered by the release of gravitational energy in a compact accretion disk surrounding a massive black hole. Such disks are also necessary to collimate powerful radio jets seen in some AGN.
A Capetti, A Efstathiou, A Lawrence, A Lawrence, CF Reynolds, Christopher P. O'Dea, DA Neufeld, DB Sanders, EA Pier, EA Pier, G Ferland, Jack F. Gallimore, JE Gunn, JF Gallimore, JF Gallimore, JF Gallimore, JH Krolik, JH Krolik, JH Krolik, JS Mulchaey, KI Kellerman, MC Begelman, MC Begelman, MJ Rees, PG Mezger, RRJ Antonucci, RRJ Antonucci, S Ueno, Stefi A. Baum, T Cornwell, TWB Muxlow   +30 more
core   +2 more sources

GIANT GAMMA-RAY BUBBLES FROMFERMI-LAT: ACTIVE GALACTIC NUCLEUS ACTIVITY OR BIPOLAR GALACTIC WIND? [PDF]

The Astrophysical Journal, 2010
Data from the Fermi-LAT reveal two large gamma-ray bubbles, extending 50° above and below the Galactic center (GC), with a width of about 40° in longitude. The gamma-ray emission associated with these bubbles has a significantly harder spectrum (dN/dE ~ E –2) than the inverse Compton emission from electrons in the Galactic disk, or the gamma rays ...
Su, Meng, Slatyer, Tracy R., Finkbeiner, Douglas P.   +2 more
openaire   +3 more sources

A Candidate Dual Active Galactic Nucleus At Z=1.175 [PDF]

, 2012
The X-ray source CXOXBJ142607.6+353351 (CXOJ1426+35), which was identified in a 172 ks Chandra image in the Bootes field, shows double-peaked rest-frame optical/UV emission lines, separated by 0.''69 (5.5 kpc) in the spatial dimension and by 690 km s(-1)
Assef, Roberto J., Barrows, R. Scott, Comerford, Julia M., Cushing, Michael C., Fassnacht, Christopher D., Gonzalez, Anthony H., Griffith, Roger, Harrison, Fiona, Hickox, Ryan, Kirkpatrick, J. Davy, Lagattuta, David J., Madsen, Kristin, Stern, Daniel   +12 more
core   +2 more sources

The Nuclear Spectral Energy Distribution of NGC 4395, The Least Luminous Type 1 Seyfert Galaxy [PDF]

, 1999
We present X-ray (ROSAT), infrared, and radio observations of NGC 4395, which harbors the optically least luminous type 1 Seyfert nucleus discovered thus far.
Alexei V. Filippenko, Andrea Comastri, Casali M. M., Edward C. Moran, Hasinger G., Joseph C. Shields, Luis C. Ho, Padovani P., Pfeffermann E., Reynolds C. S., Richard A. Sramek, Steven L. Snowden, Tomaso Belloni, Walter R.   +13 more
core   +2 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

Extreme variability in an active galactic nucleus: Gaia16aax [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT We present the results of a multiwavelength follow-up campaign for the luminous nuclear transient Gaia16aax, which was first identified in 2016 January. The transient is spatially consistent with the nucleus of an active galaxy at z = 0.25, hosting a black hole of mass ${\sim }6\times 10^8\, \mathrm{M}_\odot$.
G Cannizzaro, M Fraser, P G Jonker, J E Pringle, S Mattila, P C Hewett, T Wevers, E Kankare, Z Kostrzewa-Rutkowska, Ł Wyrzykowski, F Onori, J Harmanen, K E S Ford, B McKernan, C J Nixon   +14 more
openaire   +6 more sources

Modeling Nearby Low-Luminosity Active-Galactic-Nucleus Jet Images at All VLBI Scales

Galaxies, 2022
Relativistic jets from nearby low-luminosity active-galactic-nuclei (LLAGN) were observed by Very-Long Baseline Interferometry (VLBI) across many orders of magnitude in space, from milliparsec to sub-parsec scales, and from the jet base in the vicinity ...
Hung-Yi Pu, Keiichi Asada, Masanori Nakamura   +2 more
doaj   +1 more source