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The Astrophysical Journal Letters
Scopus
ISSN 2041-8205 · IOP Publishing · 3.223 artikel di indeks
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Artikel Jurnal
Bridging Scales: How Much Do Supermassive Black Holes Grow in the Suppressed Bondi Regime?
The coevolution of supermassive black holes (SMBHs) and their host galaxies remains one of the central open questions in cosmology, rooted in the coupling between accretion, feedback, and the multiscale physics that links the event horizon to the circumgalactic medium. Here we bridge these scales…
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Dark-matter-deficient Galaxies from Collisions: A New Probe of Bursty Feedback and Dark Matter Physics
High-velocity collisions between gas-rich ultradiffuse galaxies present a promising formation channel for dark-matter-deficient galaxies (DMDGs). Using hydrodynamical simulations, we show that the progenitors’ baryonic binding energy, ∣ E _bind ∣, critically controls the outcome. Repeated potential…
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CECILIA: Gas-phase Physical Conditions and Multielement Chemistry at Cosmic Noon
Galaxies at Cosmic Noon ( z ∼ 2–3) are characterized by rapid star formation that will lead to significant metal enrichment in the interstellar medium (ISM). While much observational evidence suggests that these galaxies are chemically distinct from those in the local Universe, directly measuring…
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Extreme-ultraviolet Synthesis of Nanojet-like Ejections due to Coalescing Flux Ropes
Detection and characterization of small-scale energetic events such as nanoflares and nanojets remain challenging owing to their short lifetimes, small spatial extent, and relatively low energy release, despite their potential role in coronal heating. Recent observations have identified nanojets as…
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Artikel Jurnal
The Maximum Particle Energy Gain during Magnetic Reconnection
The factors that control the maximum energy attained by protons and electrons during magnetic reconnection are investigated analytically and using large-scale simulations with the kglobal model. Previous work revealed that a strong ambient guide field strongly impacts particle energy gain during…
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Artikel Jurnal
On the Ultralong Gamma-Ray Transient GRB 250702B/EP 250702a
GRB 250702B/EP 250702a is an interesting long-duration gamma-ray transient whose nature is in debate. To obtain a full picture in the gamma-ray band, we implement a comprehensive targeted search of burst emission in a wide window of 30 days jointly with Insight-HXMT, GECAM, and Fermi Gamma-ray…
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Using Gravity as an Age Indicator for Young Stars
The age of a young star is difficult to measure and yet is a fundamental property that is essential for understanding stellar evolution. Accurate age indicators across the early phases of low-mass stars are scarce and often rely on properties of the circumstellar environment. We investigate stellar…
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Composition and Space-weathering Characteristics of the Tianwen-2 Mission’s First Target: Near-Earth Asteroid (469219) Kamo‘oalewa
The near-Earth asteroid Kamo‘oalewa, a quasi-satellite of the Earth and the first target for sample return by China’s Tianwen-2 mission, exhibits distinctive spectral characteristics. This study reanalyzes the visible and near-infrared reflectance spectrum of Kamo‘oalewa published by B. N. L…
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IK Pegasi and the Double-merger Path to Type Ia Supernovae
Recent Gaia astrometry has revealed thousands of main-sequence + white dwarf (MS+WD) binaries at separations of ∼0.1–10 au, including a subset hosting unusually massive (≳0.8 M _⊙ ) WDs. We argue that s -process enrichment in the nondegenerate companion provides a powerful diagnostic for…
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Artikel Jurnal
Discovery of a Dwarf Planet Candidate in an Extremely Wide Orbit: 2017 OF201
We report the discovery of a dwarf planet candidate, 2017 OF201, currently located at a distance of 90 au. Its orbit is extremely wide and extends to the inner Oort cloud, with a semimajor axis of 830 au and a perihelion of 45 au, precisely determined from 24 observations over 20 yr. Assuming a…
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Artikel Jurnal
Intruder Alert: Breaking Resonant Chains with Planetesimal Flybys
The orbital architectures of compact “Kepler-multi” (KM) exoplanet systems record their complicated dynamical histories. The “breaking-the-chains” hypothesis proposes that compact systems typically form in chains of mean-motion resonances and subsequently break out on a ∼100 Myr timescale. We…
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Artikel Jurnal
Brightest Gamma-Ray-burst Flare Observed in GRB 221009A: Bridging the Last Gap between the Prompt Emission and Flare in Gamma-Ray Bursts
Flares are usually observed during the afterglow phases of Gamma-ray bursts (GRBs) in the soft-X-ray, optical, and radio bands—but rarely in the gamma-ray band. Despite its extraordinary brightness, GECAM-C has accurately measured both the bright prompt emission and flare emission of GRB 221009A…
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Artikel Jurnal
Reexamining Evidence of a Pair-instability Mass Gap in the Binary Black Hole Population
The fourth Gravitational-Wave Transient Catalog (GWTC-4) has enabled empirical probes of the theorized pair-instability gap in the higher end of the binary black hole (BBH) mass spectrum. In this Letter, using flexibly parameterized models, we show that, at present, there is no evidence of a sharp…
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Artikel Jurnal
On Schur Decomposition of Magnetic and Velocity Gradient Tensors in Space Plasma Turbulence
The study of the statistics of gradient tensors’ invariants is useful to characterize the morphological/topological features of magnetic flux and plasma velocity flow lines in turbulent space plasmas. In the recent past, some studies of the statistics of the gradient tensors’ invariants have been…
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Water Production of Interstellar Comet 3I/ATLAS from SOHO/SWAN Observations after Perihelion
The Solar Wind Anisotropies all-sky hydrogen Lyman-alpha camera on the Solar and Heliosphere Observatory observed the hydrogen coma of interstellar comet 3I/ATLAS, also called C/2025 N1 (ATLAS), beginning on 2025 November 6, 9 days after perihelion. Water production rates were calculated from each…
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Artikel Jurnal
A 2 au Resolution View by ALMA of the Planet-hosting WISPIT 2 Disk
We present deep, high-spatial-resolution interferometric observations of 0.88 mm continuum emission from the TYC 5709-354-1 system, hereafter WISPIT 2, obtained with the goal of detecting circumplanetary emission in the vicinity of the newly discovered WISPIT 2b planet. Observations with the most…
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Artikel Jurnal
Secular Evolution of PSR J2021+4026: Long-term γ-Ray Flux and Spin-down Variability beyond State Transitions
PSR J2021+4026 is a remarkable γ -ray pulsar exhibiting repeated transitions between high γ -ray flux (HGF) and low γ -ray flux (LGF) states. With 17 yr Fermi Large Area Telescope monitoring, we reveal persistent secular evolution and enhanced spin-down rate variability within individual emission…
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Artikel Jurnal
Molecular Gas Morphological Analogs for the Milky Way
Complete catalogs of molecular clouds in the Milky Way allow analysis of the molecular medium and the star formation properties of the Milky Way that closely follows the method used for nearby galaxies. We explore whether the big dip in the radial distribution of molecular gas in the Milky Way is…
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Artikel Jurnal
Hour-scale Variations of Water Molecules in the Lunar Soil Revealed by Chang’e-6 In Situ Observations
The speciation, inventory, and dynamic changes of water (OH/H _2 O) on the lunar surface remain poorly constrained. The Chang’e-6 (CE-6) mission conducted in situ spectroscopic measurements of lunar water over time intervals shorter than one lunar local hour (10:00–11:00 a.m.). By integrating…
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Artikel Jurnal
A Cool Earth-sized Planet Candidate Transiting a Tenth Magnitude K-dwarf From K2
The transit method is currently one of our best means for the detection of potentially habitable “Earth-like” exoplanets. In principle, given sufficiently high photometric precision, cool Earth-sized exoplanets orbiting Sun-like stars could be discovered via single transit detections; however, this…
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