Liyi Gu
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View article: XRISM Spectroscopy of the Stellar-mass Black Hole GRS 1915+105
XRISM Spectroscopy of the Stellar-mass Black Hole GRS 1915+105 Open
GRS 1915+105 was the stellar-mass black hole that best reproduced key phenomena that are also observed in type 1 active galactic nuclei (AGNs). In recent years, however, it has evolved to resemble a type 2 or Compton-thick AGN. Herein we r…
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: 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: XRISM observations of Cassiopeia A: Overview, atomic data, and spectral models
XRISM observations of Cassiopeia A: Overview, atomic data, and spectral models Open
Cassiopeia A (Cas A) is the youngest known core-collapse supernova remnant in the Galaxy and is perhaps the best-studied supernova remnant in X-rays. Cas A has a line-rich spectrum dominated by thermal emission and, given its high flux, it…
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: 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: 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: Knowledge, attitude, and practice of orthodontic treatment among student patients preparing for or undergoing treatment
Knowledge, attitude, and practice of orthodontic treatment among student patients preparing for or undergoing treatment Open
This study aimed to investigate the levels of knowledge, attitude and practice (KAP) of orthodontic treatment among student patients either preparing for or actively undergoing orthodontic treatment. This cross-sectional study was conducte…
View article: XRISM insights for interstellar sulfur
XRISM insights for interstellar sulfur Open
The X-ray Imaging Spectroscopy Mission (XRISM) provides the best spectral resolution with which to study sulfur (S) K-shell photoabsorption features from the interstellar medium (ISM). For the first time, we demonstrate the high-signal det…
View article: Comprehensive Laboratory Benchmark of K-shell Dielectronic Satellites of Fe <scp>xxv</scp>–<scp>xxi</scp> Ions
Comprehensive Laboratory Benchmark of K-shell Dielectronic Satellites of Fe <span>xxv</span>–<span>xxi</span> Ions Open
We report on comprehensive laboratory studies of the K-shell dielectronic recombination resonances of Fe xxv – xxi ions that prominently contribute to the hard X-ray spectrum of hot astrophysical plasmas. By scanning a monoenergetic electr…
View article: I Speak and You Find: Robust 3D Visual Grounding with Noisy and Ambiguous Speech Inputs
I Speak and You Find: Robust 3D Visual Grounding with Noisy and Ambiguous Speech Inputs Open
Existing 3D visual grounding methods rely on precise text prompts to locate objects within 3D scenes. Speech, as a natural and intuitive modality, offers a promising alternative. Real-world speech inputs, however, often suffer from transcr…
View article: A New Shock in the Premerging Cluster Pair 1E2215-2216
A New Shock in the Premerging Cluster Pair 1E2215-2216 Open
The galaxy cluster pair 1E2216.0-0401 and 1E2215.7-0404 represents a major cluster merger in its early stages, a phase that has been scarcely explored in previous studies. Within this system, both axial and equatorial merger shocks have be…
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: 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: Comprehensive Laboratory Benchmark of K-shell Dielectronic Satellites of Fe XXV-XXI Ions
Comprehensive Laboratory Benchmark of K-shell Dielectronic Satellites of Fe XXV-XXI Ions Open
We report on comprehensive laboratory studies of the K-shell dielectronic recombination (DR) resonances of Fe XXV - XXI ions that prominently contribute to the hard X-ray spectrum of hot astrophysical plasmas. By scanning a monoenergetic e…
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…
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: Spectroscopic diagnostics of high-temperature plasma in stellar corona using Fe XXIV--XXVI K-shell lines with XRISM
Spectroscopic diagnostics of high-temperature plasma in stellar corona using Fe XXIV--XXVI K-shell lines with XRISM Open
The RS CVn type binary star GT Mus was observed during its quiescence using the Resolve X-ray microcalorimeter spectrometer onboard XRISM. The main and satellite lines of the Fe XXIV--XXVI K-shell transitions were resolved for the first ti…
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 (SNRs) 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 SNR Cas …
View article: Collision-energy-sensitive State Selectivity and Line Ratios in Charge Exchange between N<sup>5+</sup> and He
Collision-energy-sensitive State Selectivity and Line Ratios in Charge Exchange between N<sup>5+</sup> and He Open
Astrophysical charge-exchange modeling depends on an accurate database of state-resolved and velocity-dependent cross sections. The cross sections, resolved by the quantum state with principal n and orbital angular momentum ℓ , are pivotal…
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…