308 papers
The PACHA project utilizes quasi-simultaneous NuSTAR and XMM-Newton observations of high-redshift AGN to reveal significantly lower coronal temperatures and higher optical depths compared to local AGN, suggesting efficient Compton cooling and consistency with purely thermal radiation MHD simulations.
This paper introduces Proto-NUX, a pathfinder telescope based on a modified Celestron RASA astrograph designed to validate the sensitivity and atmospheric extinction characteristics of the proposed Near-UV-eXplorer (NUX) facility before its scheduled on-sky testing at Pic du Midi Observatory in 2026.
This paper proposes that remnant lobed AGNs in massive clusters are significantly undercounted because their lobes rapidly implode upon jet cessation due to weak support, leading to a substantial underestimation of low-powered jet feedback in these environments.
Using NICER observations of the neutron-star low-mass X-ray binary 4U 1608-52, this study reveals that millihertz quasi-periodic oscillations are driven by marginally stable nuclear burning that ignites at progressively deeper layers as the source transitions to softer spectral states, resulting in reduced energy release consistent with theoretical predictions.
This study utilizes radiative hydrodynamic simulations of Population III star tidal disruption events to demonstrate that, despite redshift and extinction shifting the optical/UV emission to the infrared, these events produce detectable fluxes for the JWST and Roman telescopes, as well as unusually long-lasting radio flares, thereby offering promising avenues for the detection of the first generation of stars.
This study investigates how dark matter and non-magnetized plasma influence the shadow and photon orbits of a Kerr-like black hole, revealing that while dark matter has negligible effects, plasma density significantly alters shadow size and deformation depending on its distribution profile, with these findings being constrained by Event Horizon Telescope observations of M87* and Sgr A*.
This study employs 3D radiation-relativistic magnetohydrodynamic simulations to demonstrate that black hole spin has minimal impact on the accretion dynamics, magnetic flux, and spectral energy distribution of magnetically arrested disk flows in active galactic nuclei, while highlighting the significant role of radiation in driving the flow's luminosity.
Using the EDA2 SKA-Low prototype station, this study presents the largest low-frequency pulsar census in the southern hemisphere (50–250 MHz), reporting 120 detections with comprehensive spectral, polarimetric, and dispersion measure data to advance pulsar population models and ISM characterization.
This paper presents multi-wavelength observations of the normal Type IIP supernova SN 2023axu, revealing a low-density stellar wind interaction that produced a unique spectral feature near 4600 Å while confirming a progenitor mass of approximately 15 solar masses and a nickel yield of 0.055 solar masses.
This study utilizes Fast Radio Burst dispersion measures and Bayesian Markov Chain Monte Carlo analysis to constrain axion mass and axion-photon coupling parameters under the hypothesis that FRBs originate from high-magnetic-field neutron stars, yielding specific bounds on these axion properties alongside a consistent measurement of the intergalactic baryon fraction.
By applying a numerical afterglow model with finite ejecta thickness and Bayesian inference to XRF 080330 and GRB 080710, this study demonstrates that early achromatic peaks are driven by jet dynamical evolution rather than off-axis viewing, revealing a prolonged central engine activity timescale and a preference for generalized circumburst density profiles over idealized models.
This study analyzes high-cadence light curves of nearly 9,500 bright quasars to reveal that continuum reverberation lags remain significantly larger than standard disk theory predictions even at high luminosities, suggesting that the observed anti-correlation with luminosity is driven by wavelength effects and widespread contamination from variable diffuse emission.
This study analyzes archival X-ray data from NGC4051 and NGC4395 to demonstrate that while the bending frequency of their power spectral density remains energy-independent, the high-frequency slope flattens and the amplitude decreases as photon energy increases, providing critical constraints for models of AGN X-ray variability.
This study analyzes high-resolution XMM-Newton spectroscopy of the ultraluminous X-ray source NGC 5204 X-1 to reveal a biconical outflow structure characterized by collisionally-ionized plasma moving at approximately 0.3c, while also inferring the physical properties of the low-velocity emitting plasma and favoring a hybrid ionization model.
This paper demonstrates that in neutron stars, collisional decoherence causes neutron-to-mirror-neutron transitions to undergo rapid exponential relaxation rather than oscillations, thereby keeping the admixture of mirror neutrons negligible compared to ordinary neutrons.
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 $10^{-8}10^{-7}6\times10^{-13}^{-1}$.
This paper proposes that targeted searches for supermassive black hole binaries using Pulsar Timing Arrays can overcome large sky localization uncertainties, enabling the Chinese Pulsar Timing Array to measure the Hubble constant with a precision of 2 km/s/Mpc and potentially resolve the Hubble tension.
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.