274 papers
By combining NICER X-ray pulse profile modeling with radio and -ray observations, this study demonstrates that a slightly off-centred dipole augmented by a small-scale dipole on one polar cap successfully explains the multi-wavelength emission and polarization characteristics of the millisecond pulsar PSR~J04374715, suggesting its radio emission originates in regions dominated by a dipolar magnetic field.
This study investigates a blowout jet-like prominence eruption from October 6, 2023, characterizing its multi-stage kinematics, untwisting Alfvénic transverse oscillations, spectroscopic properties, and associated C-class flares and CME.
This study analyzes the covariance spectrum of the black hole X-ray binary MAXI J1820+070 up to 150 keV, revealing a high-energy coherence drop and distinct electron temperature behaviors that support a two-Comptonization model where short-timescale variability originates from an elevated inner region illuminated by cooler disk photons, while long-timescale variability arises from larger radii.
This study investigates how pressure anisotropy, modeled via the Bowers-Liang framework and a quasi-local prescription, significantly enhances the maximum mass and compactness of neutron stars while revealing that internal curvature invariants tied to matter distribution are highly sensitive to anisotropy, unlike the more robust Weyl curvature.
This multi-wavelength study of PKS 1222+216 reveals that its 2014 -ray flare resulted from the interaction between a moving jet component and a stationary feature located approximately 9.2 pc from the central engine, allowing for the estimation of magnetic field strengths (77–134 mG) that decline with distance as under non-equipartition conditions.
This review outlines the fundamental theory and numerical methods for modeling the coupled magnetic and thermal evolution of isolated neutron stars, providing benchmark tests and discussing recent advancements from axisymmetric to fully three-dimensional simulations to explain their diverse observational properties.
This paper investigates how dark dipole radiation from eccentric supermassive black hole binaries can accelerate their inspiral and alter the low-frequency stochastic gravitational-wave background, finding that while it cannot fully resolve the final-parsec problem, it remains detectable through Bayesian analysis of current pulsar timing array data.
This paper introduces a candidate cross-matching algorithm based on spin period and dispersion measure consistency to identify recurring pulsar signals, which was successfully applied to FAST data to discover the binary millisecond pulsar PSR J1647-0156B (M12B) in the globular cluster M12.
This paper investigates how dark matter environments, including minispikes and NFW haloes, modify the nonlinear gravitational memory of intermediate-mass-ratio binaries through effects like dynamical friction and accretion, ultimately demonstrating that these astrophysical surroundings leave a detectable hereditary imprint on gravitational wave signals that could be observed by future space-based detectors.
This paper reports the detection of a narrow X-ray absorption feature at 3.29 keV and candidate pulsations in the ultraluminous X-ray source NGC 4656 ULX-1, which are interpreted as evidence for a proton cyclotron resonant scattering feature indicating a local magnetic field of approximately G near the surface of a highly magnetized neutron star.
The paper proposes a variable ADAF disk model for X-ray binary systems, where the cyclic contraction and expansion of an inner optically thick ADAF torus unifies the explanation of X-ray outburst phases, spectral state transitions, specific emission line features, and the 35-day period in Her X-1, with potential applications to active galactic nuclei.
This paper theoretically and numerically demonstrates that acoustic black holes fabricated from solid materials exhibit superradiance under general conditions, though with significantly weaker amplification than regular cylinders due to material absorption, while also showing behavior consistent with extremal Kerr black holes and offering superior design flexibility.
This paper presents a unified theory demonstrating that a single dimensionless parameter governs the linear mode conversion between Alfvén, ordinary, and extraordinary plasma waves in ultramagnetized neutron star magnetospheres, where magnetic field-line curvature drives efficient, angle-dependent transitions that explain complex polarization features in pulsars and fast radio bursts.
This paper proposes a hybrid Roche-lobe overflow model for Cygnus X-3, where a focused wind-driven accretion stream creates a shock-heated turbulent wall that occults the central funnel to explain the system's deep orbital modulation, phase lag, and spectral features, while simultaneously accounting for its observed secular orbital expansion through non-conservative mass transfer.
Contrary to the prevailing belief that strong relativistic effects rapidly dissipate orbital energy to form prompt accretion disks, general relativistic hydrodynamic simulations reveal that even in strongly relativistic tidal disruption events, debris remains highly eccentric and extended with circularization occurring intrinsically slowly due to stream self-interactions that weaken relativistic shocks.
By employing a state-of-the-art recoil-kick model (gwModel_flow_prec) instead of traditional analytic approximations, this study demonstrates that the retention probability of hierarchical black-hole merger remnants in globular clusters is significantly higher, thereby altering the resulting mass and spin distributions and offering new insights into the formation of massive binaries like GW231123.
This paper reviews recent high-energy neutrino astronomy results from observatories like IceCube and KM3NeT, examining potential cosmic accelerators such as Seyfert galaxies and blazars while emphasizing the critical need for next-generation multi-messenger facilities like IceCube-Gen2 to resolve source associations and probe the ultra-high-energy regime.
This study suggests that the observed X-ray weakness in high-redshift Little Red Dots and JWST-selected AGN likely stems from suppressed hot corona emission in highly accreting supermassive black holes, a phenomenon analogous to local super-Eddington systems, while also noting that high-redshift observational limitations may further contribute to the deficit.
This paper proposes that the time-evolving MeV emission lines detected in the prompt phase of the record-breaking GRB 221009A are Doppler-boosted signatures of radioactive decay from the associated supernova, providing direct spectroscopic evidence linking the burst's prompt emission to stellar nucleosynthesis.
This "unreview" paper shifts focus from established knowledge to critical unresolved questions regarding accretion physics in white dwarfs—such as viscosity, wind launching, and precession—to motivate future research that will advance understanding across all mass scales.