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The Astrophysical Journal Supplement Series
Scopus
ISSN 0067-0049 · IOP Publishing · 1.449 artikel di indeks
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Artikel Jurnal
Searching for Spectroscopic Multiple-star Systems in the LAMOST Medium-Resolution Spectroscopic Survey
We employed the Gaussian decomposition package Gausspy+ to autonomously identify multipeak features in the cross-correlation functions (CCFs) of spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Medium-Resolution Survey (MRS), enabling the detection of single-lined…
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Artikel Jurnal
Simulations of Global Solar Convection with a Fully Compressible CHORUS++ Code
Fluid-dynamics simulations of global solar convection are a critically important tool for assessing the dynamics of the solar interior. However, simulation studies with a fully compressible hydrodynamics code are not yet common. The Compressible High-Order Unstructured Spectral differencing…
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NEXUS Early Data Release: NIRCam Imaging and WFSS Spectroscopy from the First (Partial) Wide Epoch
We present the early data release of the multicycle JWST-NEXUS treasury program (2024–2028), which includes NIRCam imaging and WFSS observations from the first (partial) NEXUS-Wide epoch covering the central 100 arcmin ^2 of the NEXUS field, located near the north ecliptic pole and within the…
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A Characterization of JWST MIRI Detector Persistence and Implications for High-contrast Imaging
The JWST MIRI detector exhibits a flux-deficit persistence, but its timescales and impacts remain largely uncharacterized, particularly at the longest imaging wavelengths. In this study, we analyze full-field MIRI imager observations at 21 μ m (F2100W) to quantify detector persistence following a…
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Artikel Jurnal
New Single-lined Spectroscopic Binaries Identified from the LAMOST Medium-resolution Spectroscopic Survey
A typical single-lined spectroscopic binary (SB1) consists of two stars with almost the same age but markedly different masses and physical properties. SB1s are essential for obtaining the statistical properties of stars and constraining stellar evolutionary models, particularly when orbital…
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Artikel Jurnal
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XV. Reverberation Mapping of Mg ii Emission Lines
As the 15th paper in a series reporting on a large reverberation mapping (RM) campaign of super-Eddington accreting massive black holes (SEAMBHs) in active galactic nuclei (AGNs), we present the results of measurements of the Mg ii lines in 18 SEAMBHs monitored spectroscopically from 2017 to 2024…
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Artikel Jurnal
GMIMS-DRAGONS: A Faraday Depth Survey of the Northern Sky Covering 350–1030 MHz
Polarized synchrotron emission at meter to centimeter wavelengths provides an effective tracer of the Galactic magnetic field. Calculating Faraday depth, the most useful parameter for mapping the line-of-sight magnetic field, requires observations covering wide frequency bands with many channels…
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Dark Energy Survey Year 6 Results: Photometric Dataset for Cosmology
We describe the photometric dataset assembled from the full 6 yr of observations by the Dark Energy Survey (DES) in support of static-sky cosmology analyses. DES Y6 Gold is a curated dataset derived from DES Data Release 2 (DR2) that incorporates improved measurement, photometric calibration…
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Galactic Interstellar 32S/34S Isotopic Ratio Traced by Sulfur Monoxide
To date, the Galactic interstellar radial ^32 S/ ^34 S gradient has only been studied with the CS isotopologues, which may be affected by uncertainties due to the use of a single tracer. As another abundant S-bearing molecules, SO and its isotopomer ^34 SO could be considered as tracers of the ^32…
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Finite Plasma β Three-dimensional Magnetic Field Extrapolation Based on the Magnetohydrodynamic Relaxation Method
The three-dimensional (3D) magnetic field in the solar atmosphere provides crucial information to help understand explosive phenomena such as solar flares and coronal mass ejections. Since it is still hard to determine the 3D magnetic field from direct observation, a nonlinear force-free field…
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Uncovering Hidden Systematics in Extreme-precision Radial Velocity Measurements
We identify and correct for small but coherent instrumental drifts in 7 yr of radial velocity (RV) data from the EXtreme PREcision Spectrograph (EXPRES). The systematics are most notable for the six months before and after 2022 January, when EXPRES experienced larger temperature variations, and we…
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Artikel Jurnal
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Releases 10 to 12
We present the quasar catalog from Data Releases 10 to 12 of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey, comprising quasars observed between 2021 September and 2024 June. We robustly identified 11,346 quasars, of which 5386 are newly discovered objects not…
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A Core-collapse Supernova Neutrino Parameterization with Enhanced Physical Interpretability
We introduce a novel parameterization of supernova neutrino energy spectra with a clear physical motivation. Its central parameter, τ ( t ), quantifies the characteristic thermal-diffusion area during the explosion. When applied to the historic SN 1987A data, this parameterization yields…
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Artikel Jurnal
LSTM-MDNz: Estimating Quasar Photometric Redshifts with an LSTM-augmented Mixture Density Network
Quasar photometric redshifts are essential for studying cosmology and large-scale structures. However, their complex spectral energy distributions cause significant redshift–color degeneracy, limiting the accuracy of traditional methods. To overcome this, we introduce long short-term memory…
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Artikel Jurnal
Toward a Comprehensive Grid of Cepheid Models with MESA. II. Impact of Physical and Numerical Assumptions on Elemental Abundances
Modern tools for modeling stellar evolution, such as the Modules for Experiments in Stellar Astrophysics, offer state-of-the-art implementations of stellar theories. However, this parametric approach introduces many free parameters that are often not constrained by observations. This is…
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Assessing the Effects of Composition and Surface Roughness on the Photopolarimetric Response of Planetary Regoliths
This study is part of an ongoing project in which we experimentally examine the effect of composition (refractive index) and surface roughness on the scattering matrix elements of a set of well-characterized rough regolith simulants. A set of four cylindrical Mars regolith simulants with controlled…
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Artikel Jurnal
Unveiling the Chemical Complexity and C/O Ratio of the HD 163296 Protoplanetary Disk: Constraints from Multiline ALMA Observations of Organics, Nitriles, and Sulfur-bearing and Deuterated Molecules
The physical and chemical conditions within a protoplanetary disk play a crucial role in determining its chemical composition, which is subsequently inherited by any forming planets. To probe these conditions, high-resolution molecular line observations, coupled with modeling, are essential. In…
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Artikel Jurnal
QHSC: The Quasar Candidate Catalog for the Hyper Suprime-Cam Subaru Strategic Program
The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a deep wide-field multiband imaging survey consisting of three layers (Wide, Deep, and UltraDeep), with the Wide layer covering ∼1470 deg ^2 to a depth of i ∼ 26 mag. We present the QHSC catalog, a machine learning–selected sample of…
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Artikel Jurnal
Stray Light Correction for the Helioseismic and Magnetic Imager
We report a point-spread function (PSF) and deconvolution procedure to remove stray light from the Helioseismic and Magnetic Imager (HMI) data. Prelaunch calibration observations, postlaunch Venus transit, and lunar transit data were used to develop the PSF and evaluate how well it reproduced the…
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Artikel Jurnal
Hunting Very High-energy-emitting (>100 GeV) High-synchrotron-peaked Blazars
Very high-energy (VHE; >100 GeV) γ -ray emission originates via some of the most extreme particle acceleration processes in the Universe. Considering beamed active galactic nuclei, i.e., blazars, only a small fraction, mainly high-synchrotron-peaked BL Lacertae (BL Lac) objects, have been detected…
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