94 citations · 194 across the 10 of their papers we have counts for
6 papers · 1 filter
Flares in the Changing Look AGN Mrk 590. II: Deep X-ray observations reveal a Comptonizing inner accretion flow
Daniel Lawther, Marianne Vestergaard, Sandra Raimundo +2
Mrk 590 is a Changing Look AGN currently in an unusual repeat X-ray and UV flaring state. Here, we report on deep X-ray observations with XMM-Newton, NuSTAR, and NICER, obtained at…
MUSE observations of a changing-look AGN I: The re-appearance of the broad emission lines
S. I. Raimundo, M. Vestergaard, J. Y. Koay +3
Optical changing-look Active Galactic Nuclei (AGN) are a class of sources that change type within a short timescale of years or decades. This change is characterised by the appeara…
Quantifying the Diffuse Continuum Contribution of BLR Clouds to AGN Continuum Inter-band Delays
Daniel Lawther, Michael R. Goad, Kirk T. Korista +2
Disk reverberation mapping of a handful of nearby AGN suggest accretion disk sizes which are a factor few too large for their luminosities, apparently at odds with the standard mod…
A Hubble Space Telescope Imaging Study of Four FeLoBAL Quasar Host Galaxies
Daniel Lawther, Marianne Vestergaard, Xiaohui Fan
We study the host galaxies of four Iron Low-Ionization Broad Absorption-line Quasars (FeLoBALs) using Hubble Space Telescope imaging data, investigating the possibility that they r…
A catalog of optical to X-ray spectral energy distributions of z~2 quasars observed with Swift. I: First results
Daniel Lawther, Marianne Vestergaard, Sandra Raimundo +1
We present the Swift optical to X-ray spectral energy distributions (SEDs) of 44 quasars at redshifts z~2 observed by Swift, part of a larger program to establish and characterize…
ALMA Probes the Molecular Gas Reservoirs in the Changing-Look Seyfert Galaxy Mrk 590
J. Y. Koay, M. Vestergaard, V. Casasola +2
We investigate if the active galactic nucleus (AGN) of Mrk 590, whose supermassive black hole was until recently highly accreting, is turning off due to a lack of central gas to fu…