638 citations · 8.2k across the 118 of their papers we have counts for
118 papers
Is there a background population of high-albedo objects in geosynchronous orbits around Earth?
Beatriz Villarroel, Enrique Solano, Hichem Guergouri +11
Old, digitized astronomical images taken before the human spacefaring age offer a unique view of the sky devoid of known artificial satellites. In this paper, we have carried out t…
A glint in the eye: photographic plate archive searches for non-terrestrial artefacts
Beatriz Villarroel, Lars Mattsson, Hichem Guergouri +4
In this paper, we present a simple strategy to identify Non-Terrestrial artefacts \citep[NTAs;][]{Kopparapu} in or near geosynchronous Earth orbits (GEOs). We show that even the sm…
Hubble Space Telescope [O III] Emission-Line Kinematics in Two Nearby QSO2s: A Case for X-ray Feedback
Anna Trindade Falcão, S. B. Kraemer, T. C. Fischer +15
We present a dynamical study of the narrow-line regions in two nearby QSO2s. We construct dynamical models based on detailed photoionization models of the emission-line gas, includ…
AGN STORM 2: I. First results: A Change in the Weather of Mrk 817
Erin Kara, Missagh Mehdipour, Gerard A. Kriss +69
We present the first results from the ongoing, intensive, multi-wavelength monitoring program of the luminous Seyfert 1 galaxy Mrk 817. While this AGN was, in part, selected for it…
Broad He I 1.08 μm absorption from the obscurer in the active galaxy NGC 5548
Conor Wildy, Hermine Landt, Martin J. Ward +2
The nucleus of the active galaxy NGC 5548 was the target of two intensive spectroscopic monitoring campaigns at X-ray, ultraviolet (UV), and optical frequencies in 2013/14. These c…
Launching the VASCO citizen science project
Beatriz Villarroel, Kristiaan Pelckmans, Enrique Solano +25
The Vanishing & Appearing Sources during a Century of Observations (VASCO) project investigates astronomical surveys spanning a time interval of 70 years, searching for unusual and…