Results 21 to 30 of about 37,389 (216)

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

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

The Changing Active Galactic Nucleus Population

The Astrophysical Journal, 2003
We investigate how the fraction of broad-line sources in the active galactic nucleus (AGN) population changes with X-ray luminosity and redshift. We first construct the rest-frame hard-energy (2-8 keV) X-ray luminosity function (HXLF) at z = 0.1-1 using Chandra Lockman Hole-Northwest wide-area data, Chandra Deep Field-North 2 Ms data, other Chandra ...
A. T. Steffen, A. J. Barger, L. L. Cowie, R. F. Mushotzky, Y. Yang   +4 more
openaire   +1 more source

3C 273 WITHNuSTAR: UNVEILING THE ACTIVE GALACTIC NUCLEUS [PDF]

The Astrophysical Journal, 2015
We present results from a 244 ks NuSTAR observation of 3C 273 obtained during a cross-calibration campaign with the Chandra, INTEGRAL, Suzaku, Swift, and XMM-Newton observatories. We show that the spectrum, when fit with a power-law model using data from all observatories except INTEGRAL over the 1–78 keV band, leaves significant residuals in the ...
Kristin K. Madsen, Felix Fürst, Dominic J. Walton, Fiona A. Harrison, Krzysztof Nalewajko, David R. Ballantyne, Steve E. Boggs, Laura W. Brenneman, Finn E. Christensen, William W. Craig, Andrew C. Fabian, Karl Forster, Brian W. Grefenstette, Matteo Guainazzi, Charles J. Hailey, Greg M. Madejski, Giorgio Matt, Daniel Stern, Roland Walter, William W. Zhang   +19 more
openaire   +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

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 outflows in galaxy discs [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
22 pages, 22 figures, published in ...
Hartwig, Tilman, Volonteri, Marta, Dashyan, Gohar   +2 more
openaire   +3 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

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