Christopher S. Reynolds

TL;DR: The current state of black hole spin measurements is described in this article, highlighting the progress made by X-ray astronomers, as well as the current excitement of gravitational wave and radio astronomy based techniques.

TL;DR: In this paper, the authors present NuSTAR observations of the powerful radio galaxy Cygnus A, focusing on the central absorbed active galactic nucleus (AGN) and show that the absorbed power-law plus reflection model leaves residuals suggesting the absorption/emission from a fast (15,000-26,000km/s), high column-density (N_W>3x10^23 cm^-2), highly ionized (xi~2,500 erg cm/s) wind.

TL;DR: In this article , Kosec et al. performed time-resolved X-ray spectroscopy over the precession phase and detected a strong decrease in the wind column density by three orders of magnitude as our sightline progressively samples the wind at greater heights above the accretion disk.

TL;DR: In this paper , the authors evaluate the potential of future X-ray observatories, particularly Athena and the proposed AXIS, to constrain ALPs via observations of cluster-hosted AGNs, taking NGC 1275 as their exemplar.

TL;DR: In this paper, spectral analysis of long Suzaku observations of five radio-loud AGNs was used to discover the presence of ultra-fast outflows with velocities ~0.1c in three of them, namely 3C 111, 3C 120 and 3C 390.