THE FAST UV VARIABILITY OF THE ACTIVE GALACTIC NUCLEUS IN FAIRALL 9 [PDF]
The Astrophysical Journal, 2014 We present results from a new optical/UV/X-ray monitoring campaign of the luminous Seyfert galaxy Fairall 9 using the Swift satellite. Using the UV-Optical Telescope (UVOT) on Swift, we find correlated optical/UV variability on all time scales ranging from the sampling time (4-days) to the length of the campaign (2.5 months).
Richard F. Mushotzky +4 more
openaire +5 more sources
VLBI Observations of NGC6240: resolving the double nuclei and radio supernovae [PDF]
, 2011 The European VLBI Network (EVN) has been used at two epochs in 2003 and 2009 to obtain multi-frequency high-resolution images of the merger galaxy NGC6240 in order to study the radio properties of all compact high-brightness components in the galaxy. Our observations at milli-arcsecond resolution detected the northern and southern nuclei and two radio ...
Baan +27 more
arxiv +3 more sources
Why (inner) bars are important but not sufficient [PDF]
, 2004 I briefly report on the work conducted to probe the gravitational potential of active and non-active disk galaxies using two-dimensional gas and stellar kinematics, first emphasizing the need to make a distinction between ''fuelling the nucleus'' and ''building a gas reservoir''.
Emsellem, Eric
arxiv +4 more sources
Discovery of a dual active galactic nucleus with ∼8 kpc separation [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2017 Abstract Targeted searches for dual active galactic nuclei (AGNs), with separations 1–10 kpc, have yielded relatively few successes. A recent pilot survey by Satyapal et al. has demonstrated that mid-infrared (mid-IR) pre-selection has the potential to significantly improve the success rate for dual AGN confirmation in late stage galaxy ...
Sara L. Ellison +5 more
openaire +5 more sources
COLLIMATION AND SCATTERING OF THE ACTIVE GALACTIC NUCLEUS EMISSION IN THE SOMBRERO GALAXY [PDF]
The Astrophysical Journal, 2013 15 pages, 5 ...
Tiago V. Ricci +2 more
openaire +5 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
Orbital Evolution of Binary Black Holes in Active Galactic Nucleus Disks: A Disk Channel for Binary Black Hole Mergers? [PDF]
Astrophysical Journal, 2021 We perform a series of high-resolution 2D hydrodynamical simulations of equal-mass binary black holes (BBHs) embedded in active galactic nucleus (AGN) accretion disks to study whether these binaries can be driven to merger by the surrounding gas. We find
Ya-Ping Li +4 more
semanticscholar +1 more source
An energetic hot wind from the low-luminosity active galactic nucleus M81* [PDF]
Nature Astronomy, 2021 For most of their lifetime, super-massive black holes (SMBHs) commonly found in galactic nuclei obtain mass from the ambient medium at a rate well below the Eddington limit1, which is mediated by a radiatively inefficient, hot accretion flow2.
Fangzheng Shi +3 more
semanticscholar +1 more source
The Destruction and Recreation of the X-Ray Corona in a Changing-look Active Galactic Nucleus [PDF]
Astrophysical Journal, 2020 We present the drastic transformation of the X-ray properties of the active galactic nucleus (AGN) 1ES 1927+654, following a changing-look event. After the optical/ultraviolet outburst the power-law component, produced in the X-ray corona, disappeared ...
C. Ricci +18 more
semanticscholar +1 more source
THE GALACTIC CENTER: NOT AN ACTIVE GALACTIC NUCLEUS [PDF]
The Astrophysical Journal Supplement Series, 2013 AbstractWe present 10 μm – 35μm Spitzer spectra of the interstellar medium in the central molecular zone (CMZ), the central 210 pc × 60 pc of the Galactic center (GC). We present maps of the CMZ in ionic and H2 emission, covering a more extensive area than earlier spectroscopic surveys in this region.
An, Deokkeun +2 more
openaire +7 more sources