316 papers
This study employs unsupervised machine learning techniques, specifically UMAP and DBSCAN, to analyze hydrogen-atmosphere white dwarfs, successfully identifying distinct subpopulations that differentiate magnetized white dwarfs and enabling the estimation of magnetic field strengths for objects lacking direct measurements.
This study presents the first sub-parsec scale VLBI analysis of the FRII radio galaxy 3C 452, revealing a symmetric, parabolically expanding twin-jet system with low Doppler factors indicative of a large viewing angle and demonstrating that narrow-line high-excitation radio galaxies achieve jet collimation at significantly smaller scales than their broad-line counterparts.
This paper presents a forecast study demonstrating that a stacking analysis of very-high-energy gamma-ray observations from active galactic nuclei located behind galaxy clusters can probe Axion-Like Particle dark matter in the $10^{-8}10^{-7}6\times10^{-13}^{-1}$.
Using XMM-Newton and Chandra data, this study identifies a merger shock in the Norma galaxy cluster that significantly enhances ram pressure stripping and alters the morphology of embedded galaxies, including creating a bright X-ray tail and transforming a radio jet into a vortex ring structure.
This paper proposes a targeted search method for supermassive black hole binaries using Pulsar Timing Arrays to overcome sky localization limitations, demonstrating that the Chinese Pulsar Timing Array alone could measure the Hubble constant with 2 km/s/Mpc precision to help resolve the Hubble tension.
Using high-resolution observations from Solar Orbiter, this study reveals that EUV flare kernels are extremely small (sub-1 Mm²) and transient (heating within seconds), indicating that energy injection during solar flares occurs in highly localized regions for very brief durations.
This paper introduces a computationally efficient "shifted-geodesic" framework that approximates gravitational-wave fluxes from spinning bodies orbiting Kerr black holes by incorporating leading spin effects into orbital frequencies while retaining the global structure of geodesic motion, offering a pragmatic tool for rapid EMRI/IMRI flux calculations and LISA parameter-space studies with minimal dephasing error.
This paper proposes a quantum mechanical model of black hole decay via fuzzy sphere tunneling mediated by monopole zero modes, demonstrating that this unitary process reproduces the semi-classical Hawking radiation rate and Boltzmann distribution while offering a framework to determine the full wave function of the emitted quanta.
This paper presents deeper NuSTAR observations of the merging galaxy cluster ZWCL 1856.8+6616, revealing an exceptionally strong X-ray shock (Mach ~3.9) at the northern relic site that significantly exceeds its radio counterpart, while confirming the absence of detectable inverse Compton emission.
This paper investigates energy extraction mechanisms and particle collisions around a rotating dyonic black hole in , gauged supergravity, demonstrating that the gauge coupling constant can significantly enhance Penrose process efficiency and enable infinite center-of-mass energy for extremal cases, thereby positioning this black hole as a more powerful Planck-scale collider than standard Kerr black holes.
Using CROCODILE hydrodynamic simulations with GADGET3/4-OSAKA, this study investigates the cosmic baryon distribution and the impact of AGN feedback by generating FRB light cones to constrain the diffuse baryon mass fraction up to z=1 and quantify how AGN-driven gas ejection reshapes the circumgalactic and intergalactic media.
This paper presents a universal theoretical model that successfully predicts the maximum energy limits of radiation belts across planetary and brown dwarf magnetospheres using only surface magnetic field strength, revealing a 7 TeV asymptotic bound and offering new insights into galactic cosmic ray sources and exoplanet habitability.
Using self-consistent GNC simulations over 12 Gyr, this study investigates the co-evolution of nuclear star clusters and massive black holes to characterize the rates, orbital properties, and mass growth contributions of extreme mass-ratio inspirals and tidal disruption events across diverse stellar populations.
This paper proposes that if neutron star mergers trigger a first-order quantum chromodynamics phase transition, the resulting bubble nucleation and dynamics would generate distinctive megahertz-range gravitational waves, offering a new observational window for future detectors.
This paper advocates for a Bayesian statistical framework based on timescale analysis to derive the most rigorous constraints on ultralight boson masses and self-interactions from black hole spin measurements, demonstrating its application to both stellar-mass and supermassive black holes while highlighting the need for standardized data sharing in the field.
This study presents the first broadband spectral and timing analysis of the Be/X-ray pulsar SXP31.0 during its 2025 giant outburst, revealing a transient 0.8-mHz quasi-periodic oscillation at super-Eddington luminosities that coincides with low soft X-ray pulsed fractions and disappears alongside subsequent timing transitions.
This paper presents a unified framework for constraining extended dark matter compact objects (EDCOs) by modeling their gravitational wakes and gas heating effects as they traverse the interstellar medium, yielding new limits on their abundance in the Leo T dwarf galaxy for masses exceeding one solar mass.
Using the Parkes Pulsar Timing Array's third data release, this study fails to confirm the supermassive black hole binary candidate in 3C 66B, instead establishing upper limits that partially rule out electromagnetic parameter estimates while proposing a new joint likelihood framework for multimessenger analysis and standard siren applications.
This study presents the first systematic analysis of explosive dispersal outflows (EDOs) using 16 years of Fermi-LAT data, revealing that three of seven observed systems, particularly the bright source DR21, emit GeV gamma rays with cosmic-ray acceleration efficiencies consistent with shocks in dense molecular environments, suggesting EDOs may contribute to the Galactic cosmic-ray budget.
This study analyzes the sub-hour spectral evolution of the 2013 Mrk 421 outburst, revealing simultaneous X-ray and VHE hysteresis loops that are best explained by a time-dependent leptonic model involving shock acceleration in a stationary jet feature, despite requiring a jet Lorentz factor higher than current VLBI measurements.