G. V. Brown
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View article: Comparing XRISM Cluster Velocity Dispersions with Predictions from Cosmological Simulations: Are Feedback Models Too Ejective?
Comparing XRISM Cluster Velocity Dispersions with Predictions from Cosmological Simulations: Are Feedback Models Too Ejective? Open
The dynamics of the intracluster medium (ICM), the hot plasma that fills galaxy clusters, are shaped by gravity-driven cluster mergers and feedback from supermassive black holes (SMBHs) in the cluster cores. XRISM measurements of ICM veloc…
View article: Comparing XRISM cluster velocity dispersions with predictions from cosmological simulations: are feedback models too ejective?
Comparing XRISM cluster velocity dispersions with predictions from cosmological simulations: are feedback models too ejective? Open
The dynamics of the intra-cluster medium (ICM), the hot plasma that fills galaxy clusters, are shaped by gravity-driven cluster mergers and feedback from supermassive black holes (SMBH) in the cluster cores. XRISM measurements of ICM veloc…
View article: Constraining gas motion and non-thermal pressure beyond the core of the Abell 2029 galaxy cluster with XRISM
Constraining gas motion and non-thermal pressure beyond the core of the Abell 2029 galaxy cluster with XRISM Open
We report on a detailed spectroscopic study of the gas dynamics and hydrostatic mass bias of the galaxy cluster Abell 2029, utilizing high-resolution observations from XRISM Resolve. Abell 2029, known for its cool core and relaxed X-ray mo…
View article: XRISM/Resolve View of Abell 2319: Turbulence, Sloshing, and ICM Dynamics
XRISM/Resolve View of Abell 2319: Turbulence, Sloshing, and ICM Dynamics Open
We present results from XRISM/Resolve observations of the core of the galaxy cluster Abell 2319, focusing on its kinematic properties. The intracluster medium (ICM) exhibits temperatures of approximately 8 keV across the core, with a promi…
View article: Thermal and kinematic properties of ejecta in SN1987A revealed by XRISM
Thermal and kinematic properties of ejecta in SN1987A revealed by XRISM Open
We present an analysis of high-resolution spectra from the shock-heated plasmas in SN 1987A, based on an observation using the Resolve instrument onboard the X-Ray Imaging and Spectroscopy Mission (XRISM). The 1.7–10 keV Resolve spectra ar…
View article: Kinematic Evidence for Bipolar Ejecta Flows in the Galactic Supernova Remnant W49B
Kinematic Evidence for Bipolar Ejecta Flows in the Galactic Supernova Remnant W49B Open
W49B is a unique Galactic supernova remnant with centrally peaked, “bar”-like ejecta distribution, which was once considered evidence for a hypernova origin that resulted in a bipolar ejection of the stellar core. However, chemical abundan…
View article: Constraining gas motion and non-thermal pressure beyond the core of the Abell 2029 galaxy cluster with XRISM
Constraining gas motion and non-thermal pressure beyond the core of the Abell 2029 galaxy cluster with XRISM Open
We report a detailed spectroscopic study of the gas dynamics and hydrostatic mass bias of the galaxy cluster Abell 2029, utilizing high-resolution observations from XRISM Resolve. Abell 2029, known for its cool core and relaxed X-ray morph…
View article: XRISM forecast for the Coma cluster: stormy, with a steep power spectrum
XRISM forecast for the Coma cluster: stormy, with a steep power spectrum Open
The XRISM Resolve microcalorimeter array measured the velocities of hot intracluster gas at two positions in the Coma galaxy cluster: 3'x3' squares at the center and at 6' (170 kpc) to the south. We find the line-of-sight velocity dispersi…
View article: Laboratory Measurements of <i>n</i> >= 3 K-shell Transition Energies of Sulfur Ions from F-like S <scp>viii</scp> to Li-like S <scp>xiv</scp>
Laboratory Measurements of <i>n</i> >= 3 K-shell Transition Energies of Sulfur Ions from F-like S <span>viii</span> to Li-like S <span>xiv</span> Open
Inner-shell transitions are ubiquitous in nonequilibrium collisionally ionized plasmas, such as supernova remnants, and in photoionized plasmas, such as outflows from active galactic nuclei and X-ray binaries. Inner-shell X-ray emission ca…
View article: X-Ray Imaging and Spectroscopy Mission
X-Ray Imaging and Spectroscopy Mission Open
The X-Ray Imaging and Spectroscopy Mission (XRISM) is a joint mission between the Japan Aerospace Exploration Agency (JAXA) and the National Aeronautics and Space Administration (NASA) in collaboration with the European Space Agency (ESA).…
View article: XRISM Reveals Low Nonthermal Pressure in the Core of the Hot, Relaxed Galaxy Cluster A2029
XRISM Reveals Low Nonthermal Pressure in the Core of the Hot, Relaxed Galaxy Cluster A2029 Open
We present XRISM Resolve observations of the core of the hot, relaxed galaxy cluster Abell 2029 (A2029). We find that the line-of-sight bulk velocity of the intracluster medium (ICM) within the central 180 kpc is at rest with respect to th…
View article: Lithium-like O5+ Emission near 19 Å
Lithium-like O5+ Emission near 19 Å Open
Using a high-resolution grating spectrometer on the Livermore EBIT-I electron beam ion trap, we have measured three n=3,4→n=1 K-shell emission lines in lithium-like O5+, which are situated near the O VIII Lyman-α lines at 19 Å. Two of the …
View article: The XRISM/Resolve View of the Fe K Region of Cyg X-3
The XRISM/Resolve View of the Fe K Region of Cyg X-3 Open
The X-ray binary system Cygnus X-3 (4U 2030+40, V1521 Cyg) is luminous but enigmatic owing to the high intervening absorption. High-resolution X-ray spectroscopy uniquely probes the dynamics of the photoionized gas in the system. In this L…
View article: Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations
Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations Open
Sagittarius A East is a supernova remnant with a unique surrounding environment, as it is located in the immediate vicinity of the supermassive black hole at the Galactic center, Sagittarius A$^{*}$. The X-ray emission of the remnant is su…
View article: Upgrades to x-ray microcalorimeter fusion diagnostic to improve calibration, spectral bandwidth selection, and count rate adjustment
Upgrades to x-ray microcalorimeter fusion diagnostic to improve calibration, spectral bandwidth selection, and count rate adjustment Open
This paper presents progress made toward the overarching goal to adapt single-photon-counting microcalorimeters to magnetic fusion energy research and demonstrate the value of such measurements for fusion. Microcalorimeter spectrometers co…
View article: The XRISM first-light observation: Velocity structure and thermal properties of the supernova remnant N 132D
The XRISM first-light observation: Velocity structure and thermal properties of the supernova remnant N 132D Open
We present an initial analysis of the X-Ray Imaging and Spectroscopy Mission (XRISM) first-light observation of the supernova remnant (SNR) N 132D in the Large Magellanic Cloud. The Resolve microcalorimeter has obtained the first high-reso…
View article: Measurement and Flexible Atomic Code (FAC) Computation of Extreme Ultraviolet (EUV) Spectra of Eu
Measurement and Flexible Atomic Code (FAC) Computation of Extreme Ultraviolet (EUV) Spectra of Eu Open
A group of EUV lines of H- and He-like ions of C provides excellent wavelength calibrations for a position-sensitive multichannel detector at a high-resolution spectrograph. We have exploited this setting for a series of spectra of highly …
View article: XRISM Spectroscopy of the Fe Kα Emission Line in the Seyfert Active Galactic Nucleus NGC 4151 Reveals the Disk, Broad-line Region, and Torus
XRISM Spectroscopy of the Fe Kα Emission Line in the Seyfert Active Galactic Nucleus NGC 4151 Reveals the Disk, Broad-line Region, and Torus Open
We present an analysis of the first two XRISM/Resolve spectra of the well-known Seyfert-1.5 active galactic nucleus (AGN) in NGC 4151, obtained in 2023 December. Our work focuses on the nature of the narrow Fe K α emission line at 6.4 keV,…
View article: Energy gain scale calibration of the XRISM Resolve microcalorimeter spectrometer: ground calibration results and on orbit comparison
Energy gain scale calibration of the XRISM Resolve microcalorimeter spectrometer: ground calibration results and on orbit comparison Open
The Resolve instrument aboard the X-ray Imaging and Spectroscopy Mission (XRISM) is a 36-pixel microcalorimeter spectrometer that provides non-dispersive spectroscopy with 5 eV spectral resolution in the soft x-ray waveband. Resolve has a …
View article: Results from a synthetic model of the ITER XRCS-Core diagnostic based on high-fidelity x-ray ray tracing
Results from a synthetic model of the ITER XRCS-Core diagnostic based on high-fidelity x-ray ray tracing Open
A high-fidelity synthetic diagnostic has been developed for the ITER core x-ray crystal spectrometer diagnostic based on x-ray ray tracing. This synthetic diagnostic has been used to model expected performance of the diagnostic, to aid in …
View article: K-shell X-Ray Emission from Lithium-like Nitrogen N v
K-shell X-Ray Emission from Lithium-like Nitrogen N v Open
We present laboratory measurements of n = 3 → n = 1 N v X-ray emission lines situated near 26 Å. The lines are excited by electron-impact collisions and are shown to reach a combined intensity of about a fifth of the combined strong N v 1 …
View article: Electron collisional excitation cross-section measurements and modeling for select Ni-like to Ge-like gold transitions
Electron collisional excitation cross-section measurements and modeling for select Ni-like to Ge-like gold transitions Open
We have experimentally determined the electron collisional excitation cross-sections for several 3d→4f and 3d→5f excitations in Ni- to Ge-like Au at energies of ∼ 0.4, 1, 2, and 3 keV above threshold energy, E T , for the 3d→4f excitations…