Ehud Behar
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View article: A Sharper View of the X-Ray Spectrum of MCG–6-30-15 with XRISM, XMM-Newton, and NuSTAR
A Sharper View of the X-Ray Spectrum of MCG–6-30-15 with XRISM, XMM-Newton, and NuSTAR Open
We present a time-averaged spectral analysis of the 2024 XRISM observation of the narrow-line Seyfert-1 galaxy MCG–6-30-15, taken contemporaneously with XMM-Newton and NuSTAR. Our analysis leverages a unique combination of broadband and hi…
View article: Probing Accretion Disk Winds of Stratified Nature with Fe <scp>xxvi</scp> Doublet in Black Hole X-Ray Binaries
Probing Accretion Disk Winds of Stratified Nature with Fe <span>xxvi</span> Doublet in Black Hole X-Ray Binaries Open
Powerful ionized accretion disk winds are often observed during episodic outbursts in Galactic black hole transients. Among those X-ray absorbers, Fe xxvi doublet structure (Ly α 1 +Ly α 2 with ∼20 eV apart) has a unique potential to bette…
View article: XRISM view of a stellar flare: High-resolution Fe K spectra of HR 1099, an RS CVn-type star
XRISM view of a stellar flare: High-resolution Fe K spectra of HR 1099, an RS CVn-type star Open
A high-resolution X-ray spectroscopic observation was made of the RS CVn-type binary star HR 1099 using the Resolve instrument onboard XRISM for its calibration purposes. During the $\sim$400 ks telescope time covering 1.5 binary orbit, a …
View article: Discovery of Powerful Multivelocity Ultrafast Outflows in the Starburst Merger Galaxy IRAS 05189–2524 with XRISM
Discovery of Powerful Multivelocity Ultrafast Outflows in the Starburst Merger Galaxy IRAS 05189–2524 with XRISM Open
We observed the X-ray-bright ultraluminous infrared galaxy IRAS 05189−2524 with XRISM during its performance verification phase. The unprecedented energy resolution of the onboard X-ray microcalorimeter revealed complex spectral features a…
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: Elemental Abundances in X-Ray Binary Outflows
Elemental Abundances in X-Ray Binary Outflows Open
Line-resolved X-ray spectra of outflows from X-ray binaries are interesting since they provide quantifiable measures of the accreted material onto the compact object (black hole or neutron star), which can not be observed directly in the a…
View article: Benchmark of the Fe <scp>xxv</scp> 𝓡 ratio in photoionized plasma during eclipse of Centaurus X-3 with XRISM/Resolve
Benchmark of the Fe <span>xxv</span> 𝓡 ratio in photoionized plasma during eclipse of Centaurus X-3 with XRISM/Resolve Open
The $\mathcal {R}$ ratio is a useful diagnostic of the X-ray emitting astrophysical plasmas and is defined as the intensity ratio of the forbidden over the inter-combination lines in the K$\alpha$ line complex of He-like ions. The value is…
View article: Radio emission from absorption-line quasars
Radio emission from absorption-line quasars Open
Absorption Line Quasars (ALQs) generally exhibit significant outflows that may interact with the surrounding medium, resulting in radio emission. We selected a sample of 13 powerful radio-quiet (RQ) ALQs, where the UV outflow kinetic power…
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: X-Ray Observations of Nova Sco 2023: Spectroscopic Evidence of Charge Exchange
X-Ray Observations of Nova Sco 2023: Spectroscopic Evidence of Charge Exchange Open
The supersoft source phase of a nova eruption, observed a few days after the outburst, usually displays an absorbed X-ray thermal continuum with absorption features, emitted by the white dwarf atmosphere. However, the X-ray spectra of many…
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: XRISM Spectroscopy of Accretion-driven Wind Feedback in NGC 4151
XRISM Spectroscopy of Accretion-driven Wind Feedback in NGC 4151 Open
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 spectroscopy is the ideal tool to understand this feedback mode, as i…
View article: XRISM Spectroscopy of the Stellar-mass Black Hole 4U 1630-472 in Outburst
XRISM Spectroscopy of the Stellar-mass Black Hole 4U 1630-472 in Outburst Open
We report on XRISM/Resolve spectroscopy of the recurrent transient and well-known black hole candidate 4U 1630−472 during its 2024 outburst. The source was captured at the end of a disk-dominated high/soft state at an Eddington fraction of…
View article: Spatially Resolved Modeling of Galactic H<i>α</i> Emission for Galaxy Clustering
Spatially Resolved Modeling of Galactic H<i>α</i> Emission for Galaxy Clustering Open
Near-infrared spectroscopic surveys target high-redshift emission-line galaxies (ELGs) to probe cosmological scenarios. Understanding the clustering properties of ELGs is essential to derive optimal constraints. We present a simple radiati…
View article: Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM Open
Multiple clumpy wind components ($v_\mathrm{out}\sim 0.2\!-\!0.3c$) in the luminous quasar PDS 456 have recently been resolved in the Fe K band for the first time, thanks to the high-resolution X-ray spectrometer Resolve onboard XRISM. In …
View article: The unusual spectrum of the X-ray transient source XRISM J174610.8-290021 near the Galactic center
The unusual spectrum of the X-ray transient source XRISM J174610.8-290021 near the Galactic center Open
The Galactic center region was observed with the XRISM X-ray observatory during the performance verification phase in 2024 and a point-like X-ray source was detected with the X-ray imager Xtend at a position of (RA, Dec)=(17h46m10.8s, -29°…
View article: Elemental Abundances in X-ray Binary Outflows
Elemental Abundances in X-ray Binary Outflows Open
Line resolved X-ray spectra of outflows from X-ray binaries are interesting since they provide quantifiable measures of the accreted material on to the compact object (black hole or neutron star), which can not be observed directly in the …
View article: Mapping Cassiopeia A’s silicon/sulfur Doppler velocities with XRISM/Resolve
Mapping Cassiopeia A’s silicon/sulfur Doppler velocities with XRISM/Resolve Open
Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities are influenced by the dynamics of the circumstellar medium…
View article: Spectroscopic diagnostics of high-temperature plasma in stellar coronae using Fe <scp>xxiv</scp>–<scp>xxiv</scp> K-shell lines with XRISM
Spectroscopic diagnostics of high-temperature plasma in stellar coronae using Fe <span>xxiv</span>–<span>xxiv</span> K-shell lines with XRISM Open
The RS CVn type binary star GT Muscae was observed during its quiescence using the Resolve X-ray microcalorimeter spectrometer onboard XRISM. The main and satellite lines of the Fe xxiv–xxiv K-shell transitions were resolved for the first …
View article: XRISM Reveals a Remnant Torus in the Low-luminosity AGN M81*
XRISM Reveals a Remnant Torus in the Low-luminosity AGN M81* Open
Up to 40% of galaxies in the local Universe host a low-luminosity active galactic nucleus (LLAGN), making it vital to understand this mode of black hole accretion. However, the presence or absence of Seyfert-like geometries—an accretion di…
View article: Measuring the asymmetric expansion of the Fe ejecta of Cassiopeia A with XRISM/Resolve
Measuring the asymmetric expansion of the Fe ejecta of Cassiopeia A with XRISM/Resolve Open
The expansion structure of supernova remnants is important for understanding not only how heavy elements are distributed into space, but also how supernovae explode. The ejecta expansion structure of the young core-collapse supernova remna…
View article: XRISM Reveals a Remnant Torus in the Low-Luminosity AGN M81*
XRISM Reveals a Remnant Torus in the Low-Luminosity AGN M81* Open
Up to 40% of galaxies in the local universe host a low-luminosity active galactic nucleus (LLAGN), making it vital to understand this mode of black hole accretion. However, the presence or absence of Seyfert-like geometries - an accretion …
View article: Evidence for charge exchange emission in supernova remnant N 132D from XRISM/Resolve observations
Evidence for charge exchange emission in supernova remnant N 132D from XRISM/Resolve observations Open
XRISM has delivered one of its first light observations on N 132D, the X-ray brightest supernova remnant in the Large Magellanic Cloud. Utilizing 193 ks of high-resolution X-ray spectroscopy data, we conduct a comprehensive search for char…
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: Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve
Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve Open
Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities are influenced by the dynamics of the circumstellar medium…