X-Ray Emission of Ultraviolet Variable Active Galactic Nucleus Candidates
The Astronomical Journal, 2023 We analyze the X-ray properties of a sample of 23 high-probability active galactic nucleus (AGN) candidates with ultraviolet variability identified in Wasleske et al.
Erik J. Wasleske, Vivienne F. Baldassare
doaj +1 more source
Neutron Star Mergers in Active Galactic Nucleus Accretion Disks: Cocoon and Ejecta Shock Breakouts
, 2021 Neutron star mergers are believed to occur in accretion disks around supermassive black holes. Here we show that a putative jet launched from the merger of a binary neutron star (BNS) or a neutron star–black hole (NSBH) merger occurring at the migration ...
Jin-Ping Zhu +3 more
semanticscholar +1 more source
Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 3516 [PDF]
, 2020 The changes of broad emission lines should be a crucial issue in understanding the physical properties of changing-look active galactic nuclei (CL-AGNs).
H. Feng +9 more
semanticscholar +1 more source
Evolution of Retrograde Orbiters in an Active Galactic Nucleus Disk [PDF]
, 2020 Active galactic nucleus (AGN) disks have been proposed as promising locations for the mergers of stellar-mass black hole binaries (BBHs). Much recent work has been done on this merger channel, but the majority focuses on stellar-mass black holes (BHs ...
Amy Secunda +6 more
semanticscholar +1 more source
An Active Galactic Nucleus Identification for 3EG J2006−2321
The Astrophysical Journal, 2002 We present a multiwavelength analysis of the high-energy gamma-ray source 3EG J2006-2321 (l = 1882, b = -2626). The flux of this source above 100 MeV is shown to be variable on timescales of days and months. Optical observations and careful examination of archived radio data indicate that its most probable identification is with PMN J2005-2310, a flat ...
Paul Wallace +3 more
openalex +3 more sources
FRAMEx. IV. Mechanical Feedback from the Active Galactic Nucleus in NGC 3079
The Astrophysical Journal, 2023 Using the Very Long Baseline Array, we observed the active galactic nucleus (AGN) in NGC 3079 over a span of six months to test for variability in the two main parsec-scale radio components, A and B , which lie on either side of the AGN.
Luis C. Fernandez +3 more
doaj +1 more source
Black hole variability and the star formation-active galactic nucleus connection : do all star-forming galaxies host an active galactic nucleus? [PDF]
, 2014 We investigate the effect of active galactic nucleus (AGN) variability on the observed connection between star formation and black hole accretion in extragalactic surveys.
Alexander, D.M. +6 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 +2 more
openaire +2 more sources
Dissecting the active galactic nucleus in Circinus – II. A thin dusty disc and a polar outflow on parsec scales [PDF]
Monthly notices of the Royal Astronomical Society, 2019 Recent observations which resolved the mid-infrared (MIR) emission of nearby active galactic nuclei (AGNs), surprisingly revealed that their dust emission appears prominently extended in the polar direction, at odds with the expectations from the ...
M. Stalevski, K. Tristram, D. Asmus
semanticscholar +1 more source
The Ionization Fraction in the Obscuring “Torus” of an Active Galactic Nucleus [PDF]
The Astrophysical Journal, 1998 In this paper, we report VLBA radio maps at three frequencies and an ASCA X-ray spectrum of the water megamaser galaxy NGC 2639, which is believed to contain an edge-on viewed accretion disk. The radio observations reveal a compact ($
M. Matsuoka +11 more
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