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The Astrophysical Journal
Scopus
ISSN 0004-637X · IOP Publishing · 14.515 artikel di indeks
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Artikel Jurnal
Hyperons in Neutron Stars across the Observed Mass Range: Insights from ΛN and ΛΛ Interactions within a Microscopic Framework
We investigate the equation of state (EOS) and macroscopic properties of neutron stars (NSs) and hyperonic stars within the framework of the lowest-order constrained variational (LOCV) method, extended to include interacting Λ hyperons. The nucleon–nucleon interaction is modeled using the AV18…
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Artikel Jurnal
CHIME-o-Grav: Wideband Timing of Four Millisecond Pulsars from the NANOGrav 15 yr Dataset
Wideband timing of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) datasets was first done for the 12.5 yr dataset. This method, where a single time of arrival and a single dispersion measure (DM) are measured using the entire bandwidth of each observation, proved to be…
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Bridging Scales: Modeling Suppressed Bondi Accretion on Black Holes and Its Impact on Galaxy Growth
The accretion and feedback processes governing supermassive black hole (SMBH) growth span an enormous range of spatial scales, from the Event Horizon to the circumgalactic medium. Recent general relativistic magnetohydrodynamic (GRMHD) simulations demonstrate that strong magnetic fields can…
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Artikel Jurnal
Exploring Cosmic Dawn with PANORAMIC. I. The Bright End of the UV Luminosity Function at z ∼ 9–17
In its first 2 yr of operation, the James Webb Space Telescope has enabled the discovery of a surprising number of UV-bright galaxies at z ∼ 10–14. Their number density is still relatively uncertain, due to cosmic variance effects, and the limited survey area with deep imaging. Here, we combine…
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Artikel Jurnal
The Geometric Crisis in Cygnus X-3: Limitations of Wind-fed Accretion and the Case for Roche Lobe Overflow
Cygnus X-3 is a Galactic X-ray binary with a 4.8 hr orbital period operating in the ultraluminous regime. Although the system is viewed at a relatively low inclination ( i ≈ 28°), it exhibits a deep orbital modulation. Recent IXPE observations show strong linear polarization orthogonal to the radio…
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Artikel Jurnal
MINDS. Anatomy of a Water-rich, Inclined, Brown Dwarf Disk: Lack of Abundant Hydrocarbons
2MASS J04381486+2611399 (or J0438) is one of the few young brown dwarfs (BDs) with a highly inclined ( i ∼ 70°) disk. Here we report results from JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectroscopy, Hubble Space Telescope (HST) Advanced Camera for Surveys, and Atacama Large…
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Artikel Jurnal
High-fidelity 3D Reconstruction of Solar Coronal Physics with the Updated CROBAR Method
We present an extension of the Coronal Reconstruction Onto B-Aligned Regions (CROBAR) method to Linear Force Free Field (LFFF) extrapolations, and apply it to the reconstruction of a set of Atmospheric Imaging Assembly, Michelson Doppler Imager, and STEREO EUVI data. The results demonstrate that…
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A Complete Theory for Nondiffusive Field Line Random Walk in Magnetic Turbulence
Previous analytical and numerical investigations of the stochastic properties of field lines in magnetic turbulence have been based on determining the running field-line diffusion coefficient. The latter transport parameter is directly related to the second moment of the field-line distribution…
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Artikel Jurnal
Analysis of Solar Surface Oscillations and Energy Transport with Bispectral Electronic Thermostatistics
The ubiquitous 5 minute solar p -mode oscillations, excited at the photosphere, play a crucial role in driving various coronal instabilities and mediating upward energy transport. These modes are strongly influenced by nonthermal electron populations. To investigate this, we employ a…
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Artikel Jurnal
Footprints in the Wind: Probing X-Ray Outflows in NGC 7469 Using Near-infrared Emission Lines
Active galactic nuclei (AGN) winds play an important role in the coevolution of supermassive black holes and their host galaxies, yet their driving mechanisms and impact on star formation remain subjects of active investigation. Critically, the lack of X-ray integral field units currently limits…
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Artikel Jurnal
Testing Physical and Phenomenological Models to Explain the Origin of the Soft Excess in Type-1 AGN
Active galactic nuclei (AGN) exhibit an excess of X-ray emission below ∼1 keV compared to the 2–10 keV continuum extrapolation. This feature is commonly named soft excess, and its origin is currently debated for type-1 AGN. To investigate the nature of the soft excess, we perform a systematic…
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Numerical Simulations of the Effects of Out-of-plane Velocity Shear on Magnetic Reconnection in the Near-Sun Solar Wind
Motivated by Parker Solar Probe observations of magnetic reconnection exhausts in current sheets near the Sun, we present particle-in-cell simulations of reconnection in the presence of shear flow perpendicular to the plane of reconnection. Increasing the strength of the flow shear decreases the…
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Artikel Jurnal
Interaction of Four Homologous Coronal Mass Ejections near the Sun
Interaction between two coronal mass ejections (CMEs) affects their kinematics, morphology, space-weather effects, etc. For the first time, we report the interaction of four homologous CMEs in the field of view of Large Angle and Spectrometric Coronagraph (LASCO) on board Solar and Heliospheric…
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Artikel Jurnal
Implications of Nonequatorial Relativistic Accretion Flows for Ultrafast Inflows in Active Galactic Nuclei
Motivated by a number of X-ray observations of active galactic nuclei (AGNs) that exhibit a potential signature of ultrafast inflows (UFIs), we consider in this work a scenario that UFIs can be physically identified as weakly magnetized hydrodynamic accretion flows that are guided and channeled by…
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Artikel Jurnal
Particle Acceleration and Pitch-angle Evolution in Relativistic Turbulence
Synchrotron radiation detected from relativistic astrophysical objects such as pulsar-wind nebulae and jets from active galactic nuclei depends on the magnetic fields and the distribution functions of energetic electrons in these systems. Relativistic magnetically dominated turbulence has been…
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Artikel Jurnal
Proposal of a Novel Physical Parameter Characterizing Solar Wind Speed in a Wave-driven Model
Empirical solar wind speed models play an important role in enabling space weather forecasting with low computational cost. Among these, one model (called the Wang–Sheeley model) is based on the asymptotic expansion factor. However, it is known that it fails in the case of pseudostreamers. In this…
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Artikel Jurnal
Preflight Background Estimates for COSI
The Compton Spectrometer and Imager (COSI) is a Compton telescope designed to survey the 0.2–5 MeV sky, consisting of a compact array of cross-strip germanium detectors. It is planned to be launched in 2027 into an equatorial low-Earth (530 km) orbit with a prime mission duration of 2 yr. The…
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Artikel Jurnal
INTEGRAL IBIS Catalog of Magnetar Bursts
One of the distinctive properties of magnetars, young neutron stars powered mainly by magnetic energy, is the emission of short (≲1 s) bursts of hard X-rays. Such bursts have been observed in nearly all the known magnetars, although at different and time-variable rates of occurrence. In the past…
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Artikel Jurnal
Isotopic Compositions and Elemental Abundances of Chromium in Presolar Silicon Carbide Grains from Asymptotic Giant Branch Stars
Isotopes of chromium (Cr) and other iron-group elements are predominantly made in the inner shells of supernovae and are later reprocessed via the slow neutron capture process ( s -process) in asymptotic giant branch (AGB) stars. Nucleosynthetic models of low-mass, solar metallicity AGB stars yield…
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Artikel Jurnal
Extremely Luminous Optical Afterglow of an Energetic Gamma-Ray Burst GRB 230204B
Robotic telescope networks play an important role in capturing early and bright optical afterglows, providing critical insights into the energetics and emission mechanisms of GRBs. In this study, we analyze GRB 230204B, an exceptionally energetic and multipulsed long GRB, detected by the Fermi…
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