Results 11 to 20 of about 90,767 (300)
UNMASKING THE ACTIVE GALACTIC NUCLEUS IN PKS J2310-437 [PDF]
The Astrophysical Journal, 2009 PKS J2310-437 is an AGN with bright X-ray emission relative to its weak radio emission and optical continuum. It is believed that its jet lies far enough from the line of sight that it is not highly relativistically beamed. It thus provides an extreme test of AGN models.
Bliss, A. F. +4 more
openaire +4 more sources
Changing-Look AGNs or Short-Lived Radio Sources? [PDF]
Frontiers in Astronomy and Space Sciences, 2017 The evolution of extragalactic radio sources has been a fundamental problem in the study of active galactic nuclei for many years. A standard evolutionary model has been created based on observations of a wide range of radio sources.
Aleksandra Wołowska +3 more
doaj +6 more sources
Chandraunveils a binary active galactic nucleus in Mrk 463 [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We analyse Chandra, XMM-Newton and HST data of the double-nucleus Ultraluminous Infrared Galaxy (ULIRG), Mrk463. The Chandra detection of two luminous ($\mathrm{L}_\mathrm{2-10 keV}=1.5\times10^{43}$ and $3.8\times10^{42}$ erg cm$^{-2}$ s$^{-1}$), unresolved nuclei in Mrk~463 indicates that this galaxy hosts a binary AGN, with a projected separation of
BIANCHI, STEFANO +4 more
openaire +3 more sources
Asymmetric jet production in the active galactic nucleus of NGC 1052 [PDF]
Astronomy & Astrophysics, 2019 Context. Few active galactic nuclei (AGN) reveal double-sided jet systems. However, these systems are crucial to understand basic physical properties of extragalactic jets. Aims.
A. Baczko +6 more
semanticscholar +5 more sources
Active galactic nucleus outflows in galaxy discs [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 Galactic outflows, driven by active galactic nuclei (AGN), play a crucial role in galaxy formation and in the self-regulated growth of supermassive black holes (BHs).
T. Hartwig, M. Volonteri, G. Dashyan
semanticscholar +5 more sources
Variabilities Driven by Satellite Black Hole Migration in Active Galactic Nucleus Disks
The Astrophysical JournalThe physical origin of active galactic nucleus (AGN) variability remains unclear. Here we propose that the magnetic reconnection induced by the migration of satellite black holes (sBHs) in the AGN disk can be a new plausible mechanism for AGN short-term ...
Jing-Tong Xing +3 more
doaj +2 more sources
3C 273 WITH NuSTAR: 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
K. Madsen +19 more
semanticscholar +6 more sources
Discovery of a dual active galactic nucleus with ∼8 kpc separation [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2017 Targeted searches for dual active galactic nuclei (AGN), with separations 1 -- 10 kpc, have yielded relatively few successes. A recent pilot survey by Satyapal et al.
S. Ellison +4 more
semanticscholar +5 more sources
DETECTION OF A POSSIBLE X-RAY QUASI-PERIODIC OSCILLATION IN THE ACTIVE GALACTIC NUCLEUS 1H 0707–495 [PDF]
, 2016 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 ...
Hai-Wu Pan +6 more
openalex +3 more sources
A Transient “Changing-look” Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data [PDF]
Astrophysical Journal Letters, 2022 We report the discovery of a new “changing-look” active galactic nucleus (CLAGN) event, in the quasar SDSS J162829.17+432948.5 at z = 0.2603, identified through repeat spectroscopy from the fifth Sloan Digital Sky Survey (SDSS-V).
Grisha Zeltyn +34 more
semanticscholar +1 more source