Automatically translated preprints from the Chinese arXiv (ChinaXiv).
Showing 50 of 224 papers in Earth & Space
Iron low-ionization broad absorption line quasars (Fe Low-ionization Board Absorption Line Quasar, FeLoBALQ) represent one of the rarest subclasses of quasars. The radiation from these objects violently expels surrounding material, forming powerful high-velocity outflows in which low-ionization spec…
To address the problem of low computational efficiency in calculating thermally induced deformation of large reflector antennas, a method for rapidly predicting antenna thermal deformation is proposed. The method first establishes a thermal analysis model for a single antenna panel, then analyzes th…
For the catalog management of large batches of space debris, the correlation matching between wide-area surveillance orbit measurement data and cataloged targets is a prerequisite and key factor. The correlation accuracy rate not only affects normal catalog processing but also influences observation…
Galaxy structural parameters are fundamental to understanding galaxy formation and evolution. Existing galaxy fitting software, such as GALFIT and 2DPHOT, suffer from limitations including slow runtime performance, heavy reliance on manual intervention, and sensitivity to initial values. To circumve…
In response to the current situation of inconsistent conclusions among existing asteroid collision monitoring systems, this study investigates the linear approximation method employed by line of variation collision monitoring systems, concluding that the deviation between the orbital distribution ob…
Within the atmospheric isoplanatic angle, simultaneous measurement of interference fringes from both the scientific target and the tracking target enables microarcsecond-level astrometric precision through precise determination of the optical path difference between the two fringe patterns. For high…
This study defines entropy related to mass ordering in multi-planetary systems and investigates the impact of planetary system dynamical evolution on planetary mass-ordering entropy using Monte Carlo simulations and $N$-body dynamical numerical simulations. The results demonstrate that behaviors suc…
In the hierarchical clustering model of galaxy formation and evolution, interactions and merger processes between galaxies serve as important mechanisms for galaxy mass growth, producing low surface brightness tidal structures around galaxies. Observationally, long exposure times combined with speci…
Employing the standard MIT bag model, we investigate the influence of non-Newtonian gravitational effects on the structure of color-flavor locked phase strange stars. The results demonstrate that the maximum mass of color-flavor locked phase strange stars increases not only with increasing color-sup…
Using molecular line mapping with the Institut de Radioastronomie Millimétrique (IRAM) 30 m radio telescope in the 1.3–4.0 mm band, combined with 70–870 μm continuum data and mapping of the $ {\rm{NH}}3$$(J, K)=(1, 1)$ and $(2, 2)$ lines with the Green Bank Telescope (GBT) (where $J$ is the total an…
Dark matter detection has long been a major scientific objective in modern astronomy and physics. Among these, the axion in Quantum Chromodynamics (QCD) is considered a natural candidate for dark matter. Currently, electromagnetic response detection of axions with micro-electronvolt-scale mass has r…
Searching for primordial gravitational waves in the cosmic microwave background (CMB) polarization signal is one of the key topics in modern cosmology. Cutting-edge CMB telescopes require thousands of pixels to maximize mapping speed. Using a modular design, the telescope focal plane is simplified t…
The availability of large data sets containing stellar parameters, distances, and extinctions for stars in the Milky Way, particularly within the Galactic disk, is essential for advancing our understanding of the Galaxy's stellar populations, structure, kinematics, and chemical evolution. In this st…
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) has become a crucial resource in astronomical research, offering a vast amount of spectral data for stars, galaxies, and quasars. This paper presents the data processing methods used by LAMOST, focusing on the classification and …
Before solar eruptions, a short-term slow-rise phase is often observed, during which the pre-eruption structure ascends at speeds much greater than the photospheric motions but much less than those of the eruption phase. Numerical magnetohydrodynamic (MHD) simulations of the coronal evolution driven…
The China Space Station Telescope (CSST) is primarily designed for large-scale multi-color imaging and seamless spectroscopic survey, while also accommodating observations with an integral field spectrograph (IFS), multi-channel imaging, direct imaging of exoplanets, and terahertz-band observations.…
Photometric redshifts of galaxies obtained from multi-wavelength data are widely used in photometric surveys due to their high efficiency. Although various methods have been developed, template fitting remains one of the most popular approaches. Its accuracy strongly depends on the quality of spectr…
We present the application of a machine learning based galaxy group finder to real observational data from the Sloan Digital Sky Survey Data Release 13 (SDSS DR13). Originally designed and validated using simulated galaxy surveys in redshift space, our method utilizes deep neural networks to recogni…
δ Scuti (δ Sct) stars are potential distance tracers for studying the Milky Way structure. We conduct a comprehensive analysis of the period–luminosity (PL) and period–luminosity–metallicity (PLZ) relations for δ Sct stars, integrating data from the Zwicky Transient Facility, the Transiting Exoplane…
In this manuscript, we report evidence to support the dependence of Dn4000 (4000 Å break strength to trace stellar ages) on central active galactic nuclei (AGN) activity traced by narrow emission line properties in local Type-2 AGN in SDSS DR16. Based on the measured Dn4000 and flux ratios of [O iii…
The study of multiple molecular spectral lines in gas infalling sources can provide the physical and chemical properties of these sources and help us estimate their evolutionary stages. We report line detections within the 3 mm band using the FTS wide-sideband mode of the IRAM 30 m telescope toward …
The central compact object XMMU J173203.3−344518 in the supernova remnant HESS J1731−347 challenges conventional neutron star models due to its low mass and high redshifted surface temperature eV (). We investigate the observational properties of XMMU J173203.3−344518 within a color-flavor-locked(CF…
LB-1 is a binary system that has drawn great attention since its discovery in 2019. The two components of LB-1 are suggested to be a B-type star plus a black hole (BH). In this paper, we first calculate the wind mass-loss rate of the B-type star. We then calculate the mass capture rate by the BH, wi…
We demonstrate by three-dimensional hydrodynamical simulations of energy deposition into the envelope of a red supergiant model the inflation of a Rayleigh–Taylor unstable envelope that forms a compact clumpy circumstellar material (CSM). Our simulations mimic vigorous core activity years to months …
The Spectral Imaging CoronaGraph (SICG) serves as the optical observation equipment of E-corona in the Chinese Meridian Project Phase II, which aims at monitoring the initial source of solar activities. For the purpose of in-depth exploration and space weather forecast in the full chain of Sun–Earth…
The study of carbon-enhanced metal-poor (CEMP) stars is of great significance for understanding the chemical evolution of the early universe and stellar formation. CEMP stars are characterized by carbon overabundance and are classified into several subclasses based on the abundance patterns of neutr…
Numerous experiments have been designed to investigate the Cosmic Dawn (CD) and Epoch of Reionization (EoR) by examining redshifted 21 cm emissions from neutral hydrogen. Detecting the global spectrum of redshifted 21 cm signals is typically achieved through single-antenna experiments. However, this…
Accurate measurements of stellar positions and velocities are crucial for studying galactic and stellar dynamics. We aim to create a Cartesian catalog from Gaia DR3 to serve as a high-precision database for further research using stellar coordinates and velocities. To avoid the negative parallax val…
Recent JWST observations have revealed that dwarf galaxies start to cease star formation at redshifts z > 1, yet the quenching process remains unclear. In this study, we selected a large sample of 3405 dwarf galaxies with stellar masses below 10^9.5 M⊙ and redshifts ranging from 1.0 to 1.5 across al…
We explore the feasibility of H i galaxy redshift surveys with the Five-hundred-meter Aperture Spherical Telescope (FAST) and its proposed Core Array interferometry. Using semi-analytical simulations, we compare the performance of the FAST single-dish and Core Array modes in drift scan (DS) and on-t…
Pulsar candidate identification is an indispensable task in pulsar science. Based on the characteristics of imbalanced and diverse pulsar data sets, and the lack of a unified processing framework, we first used dimensionality reduction and visualization to analyze potential deficiencies caused by th…
In this paper, new light curve fitting and orbital period change analysis of two contact binaries NSVS 9023048 and NSVS 2461789 are presented. We found that both of them are totally eclipsing contact binaries. Our photometric solutions suggest that NSVS 9023048 is a deep contact binary (q = 10.14, f…
This study addresses the critical technical need to enhance the 1–10 day prediction accuracy of polar motion (PM) in satellite autonomous navigation and deep space exploration, with a focus on optimizing the convolution input accuracy within the least squares and autoregression with effective angula…
The surface particle size and distribution characteristics of celestial bodies (e.g., the Moon, asteroids, etc.) will affect the interpretation of hyperspectral remote sensing data and the implementation of sampling missions. Currently, the estimation of the surface particle sizes is mainly focusing…
Integrating available instrumental records with meteorite analysis could build a link between meteorite chemical groups and their original parent bodies. However,such comprehensive source region-tracing studies have not been conducted for any meteorite fall events in China. On 2022 December 15 at 09…
We present a comprehensive analysis of AstroSat/LAXPC data of the second spin-up and second spin-down phases of the persistent X-ray pulsar 4U 1626-67. Flares followed by a broad dip are detected in the spin-up observations. The pulse profiles changed from a shoulder-like structure to a broad sinuso…
We present a polarization study of 25 globular cluster (GC) pulsars observed with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), including 15 profiles measured for the first time. The pulse width–period relationships for millisecond pulsars (MSPs) in GCs follow power-law indices o…
We present the results of a multi-epoch, detailed spectral and temporal analysis of the ultraluminous X-ray source (ULX), ULX-1, in the galaxy NGC 4088 using XMM-Newton, Chandra, and Swift observations. The presence of a hard powerlaw spectral slope supports the interpretation of ULX-1 as a hard ULX…
In this study, we used the f(T) gravity framework with the energy-momentum tensor for a perfect fluid to derive key cosmological parameters, including the Hubble parameter H, deceleration parameter q and Statefinder diagnostics. Model parameters were optimized using an R2 test, resulting in , , and …
This is the second paper in a series that utilizes integral field spectroscopy from MaNGA, NUV imaging from Swift/UVOT, and NIR imaging from 2MASS to investigate dust attenuation properties on kpc scales in nearby galaxies. We apply the method developed in our previous work to the updated SwiM_v4.2 …
Superluminous supernovae (SLSNe) and luminous supernovae (LSNe) exhibit extreme luminosities, which require additional energy supply mechanisms such as central engines or circumstellar interaction. In the central-engine scenario, jets inject energy into the polar ejecta, modifying its evolution and …
When a planet is ejected from its star-planet system due to dynamical interactions, its satellite may remain gravitationally bound to the planet. The Chinese Space Station Telescope (CSST) will be capable of detecting a large number of low-mass free-floating planet events (FFPs) from a bulge microle…
We present the first high-precision model for the group-scale strong lensing systemCASSOWARY 19 (CSWA19), utilizing images from the Hubble Space Telescope. Sixteen member galaxies identified via the red-sequence method, and the main halo, all modeled as the dual Pseudo Isothermal Elliptical profile,…
We use a simple dynamical scheme to simulate the ejecta of type Ia supernova (SN Ia) scenarios with two exploding white dwarfs (WDs) and find that the velocity distribution of the ejecta has difficulties accounting for bimodal emission line profiles with a large separation between the two emission p…
The identification of specific galaxy populations in large-scale spectroscopic surveys represents an essential yet challenging task, particularly for rare or anomalous galaxies that deviate from the typical galaxy distributions. Traditional methods based on template-fitting or predefining spectral f…
We present an analysis of the cross-correlation between optical brightness and polarization degree in different types of blazars. The aim is to identify objects with simultaneous and consistent changes in characteristics and to determine if this behavior relates to the types of objects studied. The …
Previous X-ray and optical studies of the galaxy cluster pair A222/223 suggested the possible presence of a filamentary structure connecting the two clusters, a result that appears to be supported by subsequent weak-lensing analyses. This filament has been reported to host a primordial warm-hot inte…
In this work, we investigate a joint fitting approach based on theoretical models of power spectra associated with density-field reconstruction. Specifically, we consider the matter auto-power spectra before and after baryon acoustic oscillations (BAO) reconstruction, as well as the cross-power spec…
Exoplanet imaging using the solar gravitational lens is an enticing prospect. The fundamental physical properties of the lens, including its angular resolution and light amplification, promise exceptional capabilities. These expectations, however, are tempered by the realization of numerous challeng…
Imaging serves as an important method for astronomical research. In practice, original images acquired by a telescope are often convolved and blurred by the point-spread function (PSF), which is highly detrimental to many scientific studies, including astronomy. This paper introduces a single-equati…
