871 papers
This paper demonstrates that while traditional global VTEC maps significantly overestimate Ionospheric Faraday Rotation for the VLA and MeerKAT, utilizing the ALBUS software with local GNSS station data yields highly accurate corrections, while also establishing the intrinsic electric vector position angles of standard calibrators 3C286 and 3C138 across a broad frequency range.
This paper presents a new image-segmentation methodology to construct homogeneous HII region catalogues in NGC 2403 and NGC 628, revealing low volume filling factors and tentative scaling relations between electron densities and galaxy properties that offer new constraints for massive cluster formation models and high-redshift interpretations.
This study employs rotating stellar models with dynamically varying magnetic field strength and mixing-length parameters to successfully reproduce observed lithium abundances and general rotational trends in solar-type stars, though it currently overestimates the Sun's present-day rotation rate and magnetic field, highlighting the need for additional angular momentum loss mechanisms.
This paper presents new astrometric measurements for 13 nearby cold brown dwarfs using combined Spitzer and HST data, revealing significant intrinsic scatter in their photometric properties that renders distance estimates unreliable and underscores the necessity of direct parallax measurements for accurate characterization.
This paper demonstrates that the commonly used frequency range of for predicting solar-like oscillation detectability is suboptimal, and recommends adopting a narrower range of to maximize detection probabilities and yields for asteroseismic surveys.
This paper combines advanced stellar evolution and atmosphere modeling to predict the synthetic spectral characteristics of fast-rotating, very metal-poor massive stars, revealing a transition from early-O type giants/supergiants to WO-type spectral classes as they evolve, with the goal of validating these predictions against upcoming Hubble Space Telescope observations.
Using tailored N-body simulations across various Milky Way mass models, this study reconstructs the infall mass of the Sextans dwarf spheroidal galaxy to range between $1.223.14\times10^9\rm\,M_\odot$, demonstrating that its current stellar kinematics provide robust dynamical constraints while its dark matter tidal loss is primarily driven by the host galaxy's mass.
This study utilizes simultaneous NuSTAR, NICER, and Insight-HXMT observations of GX 339-4's 2021 outburst to demonstrate that incorporating a warm Comptonization component in the hard state resolves discrepancies in disk normalization, thereby supporting a dual-corona accretion geometry where the disk is physically truncated and cooler compared to the soft state.
By analyzing a sample of 241 Swift long gamma-ray bursts, this study demonstrates that the Amati and Yonetoku relations exhibit no significant redshift evolution and actually yield better fits at high redshifts, confirming their reliability as cosmological probes.
This paper introduces a new method using Gaussian process regression to define curved STIS secondary echelle mode traces, which improves flux throughput by approximately 4% and has been used to update reference files for nine different modes across pre- and post-Servicing Mission 4 observations.
This paper presents a straightforward scaling method, derived from updated CALSPEC stellar models, to recalibrate pre-SM4 STIS echelle throughputs for eight modes, achieving typical flux accuracy improvements of 0.5–2.4% in the FUV and NUV.
By applying self-supervised contrastive learning and spectral energy distribution fitting to DESI Legacy Survey images, researchers overcame the challenge of foreground contamination to identify and spectroscopically confirm 16 new high-redshift quasars (–6.45), including three missed by traditional methods, thereby demonstrating a scalable framework for uncovering rare early-universe sources.
This study demonstrates that asteroseismic analysis of low-mass red giants, specifically through the comparison of seismic signatures like the diagnostic and ratios, provides a powerful method for distinguishing primordial, metal-free Population III stars from metal-enriched analogues despite surface pollution.
This paper predicts that the accretion-induced collapse of magnetized white dwarfs produces distinctive gamma-ray signatures from both r-process and iron-peak nuclei, which planned MeV gamma-ray telescopes could detect out to distances of approximately 30 Mpc, thereby offering a unique observational method to distinguish these events from binary neutron star mergers.
By analyzing all-sky kinematics of outer halo stars out to 160 kpc using Simulation Based Inference on 32,000 rigid MW-LMC simulations, this study quantifies the Milky Way's and LMC's masses while characterizing the reflex motion induced by the LMC's recent pericentric passage, revealing that the LMC's mass is at least 20% of the Milky Way's and that neglecting this interaction biases mass estimates.
This paper presents new JWST mid-infrared detections of the nearby cold gas giant Ind Ab, combining them with three decades of astrometric data to precisely determine its dynamical mass and construct its first full 4–25 m spectral energy distribution, thereby establishing it as a benchmark system that validates evolutionary models for low-mass, old exoplanets.
New JWST/MIRI observations of the cold super-Jupiter Eps Ind Ab confirm the presence of ammonia while revealing a suppressed feature and fainter-than-expected near-infrared emission, which the authors attribute to the presence of thick water-ice clouds in its atmosphere.
The paper introduces **unxt**, a Python package built on the **quax** framework that integrates **astropy.units** with **JAX** to enable seamless, high-performance, unit-aware scientific computing.
This paper demonstrates how introductory physics students can use thermodynamic principles, specifically the analogy between black hole area and entropy, to derive bounds on energy emitted during black hole mergers and understand how these concepts are applied in modern gravitational wave research.
This paper utilizes 2D3V PIC simulations to demonstrate that in freely decaying sub-ion turbulence, intermittent regions with non-zero drive helicity reduction, motivating a new history-dependent helicity density that reveals time-invariant intermediate-scale plateaus consistent with kinetic decay constraints.