24 citations · 118 across the 18 of their papers we have counts for
20 papers
X-ray Flaring and Variability in NGC 1275, the Heart of the Perseus Cluster
Sarah Ketchum, Jon M. Miller, S. W. Allen +6
NGC 1275 is the central galaxy in the Perseus Cluster. The active galactic nucleus (AGN) within NGC 1275 is notable for its strong and variable radio activity, tied to the producti…
XRISM Spectroscopy of Variable Accretion-driven Disk Winds in NGC 4151: When, Where, and How Fast Outflows are Launched
Xin Xiang, Jon Miller, Missagh Mehdipour +12
X-ray observations probe the inner accretion flow within active galactic nuclei, revealing the highest gas column densities and fastest winds. The most diverse winds yet revealed w…
Dissecting the Nuclear Structure of NGC 5548 with XRISM. I. Physical Properties of the Highly Ionized Outflows
Missagh Mehdipour, Jon M. Miller, Jelle S. Kaastra +21
We present a detailed spectral analysis of an X-Ray Imaging and Spectroscopy Mission (XRISM) observation of the prototypical Seyfert 1 galaxy NGC 5548. XRISM's Resolve microcalorim…
Reverberation in the Narrow Fe K Line in the Seyfert Galaxy NGC 4151 with XRISM
Jon M. Miller, Aberahmen Zoghbi, Xin Xiang +11
Emission lines that "echo" variations in the ionizing flux produced close to black holes are powerful probes of the central engine. In the Seyfert-1.5 galaxy NGC 4151, high-resolut…
The 0.9 Megasecond XRISM/Resolve Spectrum of the Seyfert-1 AGN NGC 4151
Jon M. Miller, Xin Xiang, Missagh Mehdipour +13
NGC 4151 is the brightest Seyfert-1 active galaxy in the pass band of the Resolve calorimeter spectrometer aboard XRISM. It has been observed on 14 occasions, resulting in a total…
Multi-layered Fast Wind observed in XMM-Newton snapshot of Seyfert 1 Markarian 877
Xin Xiang, Jon M. Miller, Ehud Behar +4
Ultra Fast Outflows (UFOs) are powerful, highly ionized winds launched from the innermost regions of Active Galactic Nuclei (AGNs), reaching velocities of 0.03 -- 0.3 c and playing…
XRISM Spectroscopy of Accretion-Driven Wind Feedback in NGC 4151
Xin Xiang, Jon M. Miller, Ehud Behar +17
The hottest, most ionized, and fastest winds driven by accretion onto massive black holes have the potential to reshape their host galaxies. Calorimeter-resolution X-ray spectrosco…
The distance of quasar outflows from the central source: The first consistent values from emission and absorption determinations
Mayank Sharma, Nahum Arav, Qinyuan Zhao +8
Measuring the distance of quasar outflows from the central source () is essential for determining their importance for AGN feedback. There are two methods to measure : 1) A d…
Physical characterization of the FeLoBAL outflow in SDSS J0932+0840: Analysis of VLT/UVES observations
Mayank Sharma, Nahum Arav, Kirk T. Korista +5
Context: The study of quasar outflows is essential in understanding the connection between active galactic nuclei (AGN) and their host galaxies. We analyze the VLT/UVES spectrum of…
Determining the absolute chemical abundance of nitrogen and sulfur in the quasar outflow of 3C298
Maryam Dehghanian, Nahum Arav, Mayank Sharma +2
Context. Quasar outflows are key players in the feedback processes that influence the evolution of galaxies and the intergalactic medium. The chemical abundance of these outflows p…
AGN STORM 2: VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations
Maryam Dehghanian, Nahum Arav, Gerard A. Kriss +39
We observed the Seyfert 1 galaxy Mrk817 during an intensive multi-wavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lin…
Narrow absorption line Outflow in Seyfert 1 galaxy J1429+4518: Outflow's distance from the central source and its energetics
Maryam Dehghanian, Nahum Arav, Doyee Byun +2
In the HST/COS spectrum of the Seyfert 1 galaxy 2MASX J14292507+4518318, we have identified a narrow absorption line (NAL) outflow system with a velocity of -151 km s This o…
Extreme FeLoBAL Outflow in the VLT/UVES Spectrum of Quasar SDSS J1321-0041
Doyee Byun, Nahum Arav, Mayank Sharma +2
Context. Quasar outflows are often analyzed to determine their ability to contribute to active galactic nucleus (AGN) feedback. We identified a broad absorption line (BAL) outflow…
BAL Outflow in Quasar B0254-3327B: Analysis and Comparison with Other Extreme UV Outflows
Doyee Byun, Nahum Arav, Maryam Dehghanian +2
We have identified a broad absorption line (BAL) outflow in the HST/STIS spectrum of the quasar QSO B0254-3327B at velocity $v=-3200\text{ km s$^{-1}$}$. The outflow has absorption…
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…
High Mass Flow Rate in a BAL Outflow of Quasar SDSS J1130+0411
Andrew Walker, Nahum Arav, Doyee Byun
We present the analysis of the absorption troughs of six outflows observed in quasar SDSS J1130+0411 () with radial velocities ranging from to km…
VLT/UVES Observation of the SDSS J2357-0048 Outflow
Doyee Byun, Nahum Arav, Patrick B. Hall
We found a broad absorption line (BAL) outflow in the VLT/UVES spectrum of the quasar SDSS J235702.54-004824.0, in which we identified four subcomponents. We measured the column de…
VLT/UVES Observation of the Outflow in Quasar SDSS J1439-0106
Doyee Byun, Nahum Arav, Andrew Walker
We analyze the VLT/UVES spectrum of the quasar SDSS J143907.5-010616.7, retrieved from the UVES Spectral Quasar Absorption Database. We identify two outflow systems in the spectrum…
The Farthest Quasar Mini-BAL Outflow from its Central Source: VLT/UVES Observation of SDSSJ0242+0049
Doyee Byun, Nahum Arav, Patrick B. Hall
We analyze VLT/UVES observations of the quasar SDSS J024221.87+004912.6. We identify four absorption outflow systems: a CIV BAL at , and three n…
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…