234 citations · 1.1k across the 36 of their papers we have counts for
12 papers · 1 filter
Fierce Feedback in an Obscured, Sub-Eddington State of the Seyfert 1.2 Markarian 817
Miranda K. Zak, Jon M. Miller, Ehud Behar +7
Markarian 817 is a bright and variable Seyfert-1.2 active galactic nucleus (AGN). X-ray monitoring of Mrk 817 with the Neil Gehrels Swift Observatory in 2022 revealed that the sour…
Evidence for a dynamic corona in the short-term time lags of black hole X-ray binary MAXI J1820+070
Niek Bollemeijer, Phil Uttley, Arkadip Basak +19
In X-ray observations of hard state black hole X-ray binaries, rapid variations in accretion disc and coronal power-law emission are correlated and show Fourier-frequency-dependent…
NuSTAR Hard X-ray Monitoring of Gravitationally Lensed Quasar RX J1131-1231
Cora A. DeFrancesco, Xinyu Dai, Mark Mitchell +2
The X-ray emission from active galactic nuclei (AGN) is believed to come from a combination of inverse Compton scattering of photons from the accretion disk and reprocessing of the…
Redshifted iron emission and absorption lines in the Chandra X-ray spectrum of Centaurus A
David Bogensberger, Jon Miller, Elias Kammoun +9
Cen A hosts the closest active galactic nucleus to the Milky Way, which makes it an ideal target for investigating the dynamical processes in the vicinity of accreting supermassive…
Systematically Revisiting All NuSTAR Spins of Black Holes in X-Ray Binaries
Paul A. Draghis, Jon M. Miller, Elisa Costantini +4
We extend our recent work on black hole spin in X-ray binary systems to include an analysis of 189 archival NuSTAR observations from 24 sources. Using self-consistent data reductio…
Measuring The Soft Excess Region Size Relative to the Corona in AGN With NICER
A. Zoghbi, J. M. Miller
The soft excess is a significant emission component in the Soft (<1 keV) X-ray spectra of many AGN. It has been explained by disk reflection, a warm corona and other models. Unders…
Evidence of a Massive Stellar Disruption in the X-ray Spectrum of ASASSN-14li
J. M. Miller, B. Mockler, E. Ramirez-Ruiz +7
The proximity and duration of the tidal disruption event (TDE) ASASSN-14li led to the discovery of narrow, blue-shifted absorption lines in X-rays and UV. The gas seen in X-ray abs…
An Extreme Black Hole in the Recurrent X-ray Transient XTE J2012+381
Paul A. Draghis, Jon M. Miller, McKinley C. Brumback +3
The black hole candidate XTE J2012+381 underwent an outburst at the end of 2022. We analyzed 105 NICER observations and 2 NuSTAR observations of the source during the outburst. The…
Negative Lags on the Viscous Timescale in Quasar Photometry and Prospects for Detecting More with LSST
Amy Secunda, Jenny E. Greene, Yan-Fei Jiang +2
The variability of quasar light curves can be used to study the structure of quasar accretion disks. For example, continuum reverberation mapping uses delays between variability in…
A hard look at the X-ray spectral variability of NGC 7582
Mehdy Lefkir, Elias Kammoun, Didier Barret +5
NGC 7582 (z = 0.005264; D = 22.5 Mpc) is a highly variable, changing-look AGN. In this work, we explore the X-ray properties of this source using XMM-Newton and NuSTAR archival obs…
The Black Hole Candidate Swift J1728.93613 and the Supernova Remnant G351.90.9
Mayura Balakrishnan, Paul A. Draghis, Jon M. Miller +12
A number of neutron stars have been observed within the remnants of the core-collapse supernova explosions that created them. In contrast, black holes are not yet clearly associate…
AGN STORM 2. III. A NICER view of the variable X-ray obscurer in Mrk 817
Ethan R. Partington, Edward M. Cackett, Erin Kara +44
The AGN STORM 2 collaboration targeted the Seyfert 1 galaxy Mrk 817 for a year-long multiwavelength, coordinated reverberation mapping campaign including HST, Swift, XMM-Newton, NI…