A quasi-periodic oscillation in the blazar J1359+4011 [PDF]
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.+8 more
core +4 more sources
Dissecting the active galactic nucleus in Circinus, I : peculiar mid-IR morphology explained by a dusty hollow cone [PDF]
Recent high angular resolution observations resolved for the first time the mid-infrared (MIR) structure of nearby active galactic nuclei (AGN). Surprisingly, they revealed that a major fraction of their MIR emission comes from the polar regions. This is
M. Stalevski, D. Asmus, K. Tristram
semanticscholar +1 more source
THE IMPACT OF GALAXY INTERACTIONS ON ACTIVE GALACTIC NUCLEUS ACTIVITY IN zCOSMOS [PDF]
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*>2.5x10^10 M_sun) in kinematic pairs over the redshift range 0.25 < z < 1.05 that are more likely to ...
C. Knobel+55 more
openaire +6 more sources
Mass of the active galactic nucleus black hole XMMUJ134736.6+173403 [PDF]
A recent study of the X-ray source XMMUJ134736.6+173403 has revealed a strong quasi-periodic modulation in the X-ray flux. The observation of two quasiperiodic oscillations (QPOs) that occur on a daily timescale and exhibit a 3:1 frequency ratio strongly supports the evidence for the presence of an active galactic nucleus black hole (AGN BH).
Goluchová, K.+5 more
openaire +4 more sources
MULTI-PHASE NATURE OF A RADIATION-DRIVEN FOUNTAIN WITH NUCLEAR STARBURST IN A LOW-MASS ACTIVE GALACTIC NUCLEUS [PDF]
The structures and dynamics of molecular, atomic, and ionized gases are studied around a low-luminosity active galactic nucleus (AGN) with a small ( 2 × 10 6 M ⊙ ) black hole using three-dimensional (3D) radiation–hydrodynamic simulations.
K. Wada, M. Schartmann, R. Meijerink
semanticscholar +1 more source
A direct image of the obscuring disk surrounding an active galactic nucleus [PDF]
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+30 more
core +2 more sources
Hitomi Observation of Radio Galaxy NGC 1275: The First X-ray Microcalorimeter Spectroscopy of Fe-K{\alpha} Line Emission from an Active Galactic Nucleus [PDF]
The origin of the narrow Fe-K alpha fluorescence line at 6.4 keV from active galactic nuclei has long been under debate; some of the possible sites are the outer accretion disk, the broad line region, a molecular torus, or interstellar/intracluster media.
H. C. F. Aharonian+192 more
semanticscholar +1 more source
COLLIMATION AND SCATTERING OF THE ACTIVE GALACTIC NUCLEUS EMISSION IN THE SOMBRERO GALAXY [PDF]
15 pages, 5 ...
Tiago V. Ricci+2 more
openaire +3 more sources
Imaging the Active Galactic Nucleus Torus in Cygnus A
We present the first direct imaging of what may be the thick torus in the active galactic nucleus (AGN) of the archetype powerful radio galaxy Cygnus A, using the Jansky Very Large Array at 18–48 GHz, with a resolution down to 45 mas.
C. Carilli+3 more
semanticscholar +1 more source
DETECTION OF A POSSIBLE X-RAY QUASI-PERIODIC OSCILLATION IN THE ACTIVE GALACTIC NUCLEUS 1H 0707–495 [PDF]
The quasi-periodic oscillation (QPO) detected in the X-ray radiation of black hole X-ray binaries (BHXBs) is thought to originate from dynamical processes in close vicinity of black holes (BHs), and thus carries important physical information therein ...
H. Pan+6 more
semanticscholar +1 more source