Most papers are machine-translated to English; some are originally in English.
Showing 44 of 144 papers in Astronomy
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…
Forbush decreases (FDs), defined as abrupt and transient reductions in cosmic ray (CR) flux intensity, are fundamental probes for understanding the complex interplay between solar activity and terrestrial weather systems. While previous studies have predominantly focused on events with absolute size…
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…
The double revolving fiber positioning technology employed in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) represents one of the most successful advancements in large-scale multi-objective spectroscopy. The precision of fiber positioning is crucial, as it directly impacts t…
This paper statistically analyzes the seeing data at the Lenghu site Platform C from 2018 to 2024, during which extensive construction modified the original landscape. The study focuses on the impacts of meteorological factors and building obstructions. The results reveal a progressive degradation i…
Galaxy groups are essential for studying the distribution of matter on a large scale in redshift surveys and for deciphering the link between galaxy traits and their associated halos. In this work, we propose a widely applicable method for identifying groups through machine learning techniques in re…
Most massive stars reside in binary or multi-object systems. Short gamma-ray bursts (sGRBs), the product of the merger of double compact objects, may originate from massive common-envelope binaries. In contrast, the progenitors of long GRBs (lGRBs) are typically considered isolated massive stars. Ho…
In this paper, we determine the photosphere evolution of PTF11rka which is a type Ic supernova (SN) by fitting its spectral energy distributions at different epochs. We find that the photosphere of PTF11rka expanded at a constant velocity at early epochs, and the photosphere temperature increased sl…
As an alternative gravitational theory to General Relativity (GR), Conformal Gravity (CG) can be verified through astronomical observations. Currently, {Mannheim and Kazanas have provided vacuum solutions for cosmological and local gravitational systems, and these solutions may resolve the dark matt…
Planetary surfaces, shaped by billions of years of geologic evolution, display numerous impact craters whose distribution of size, density, and spatial arrangement reveals the celestial body's history. Identifying these craters is essential for planetary science and is currently mainly achieved with…
This paper presents a comprehensive analysis of the photometric system of the University of Chinese Academy of Sciences 70 cm Telescope located at the Yan-qi Lake campus of the University of Chinese Academy of Sciences. We evaluated the linearity, bias stability, and dark current of the camera. Util…
To address the installation challenges of a 2-m ring Gregorian telescope system and similar optical systems with a small width-to-radius ratio, we propose a detection method combining local interferometry with a comparison model. This method enhances the precision of system calibration by establishi…
The Solar Close Observations and Proximity Experiments (SCOPE) mission will send a spacecraft into the solar atmosphere at a low altitude of just 5 R☉ from the solar center. It aims to elucidate the mechanisms behind solar eruptions and coronal heating, and to directly measure the coronal magnetic f…
Exploiting remote sensing data is a promising approach to estimate surface solar irradiance (SSI). In this study, we propose a method to estimate global SSI using a lookup table and Landsat data. Despite the low temporal resolution of the data used, the developed method produces SSI maps with adequa…
We present analog clocks fitted to the Mars solar day. These clocks use the standard Earth-based second of the International System of Units (SI) as their operational unit of time, unlike current practice for Mars timekeeping. We discuss the importance of preserving the SI second. On this basis, we …
Globular clusters harbor numerous millisecond pulsars; however, the detection of long-period pulsars within these clusters has been notably scarce. The search for long-period pulsars encounters significant challenges due to pronounced red noise interference, necessitating the crucial step of red noi…
To improve the pointing and tracking accuracy at the Coude focus of alt-azimuth solar telescopes, this paper first simulates the tracking errors introduced at the Coude focus due to misalignment among the principal optical axis, azimuth axis, altitude axis, and derotator axis in the Coude optical pa…
Phased array feed is a receiver technology that places an array antenna at the focal plane field of a radio telescope to achieve higher gain and more flexible beam control. Given that, like array antennas, it is composed of multiple antenna elements arranged in a certain configuration, electromagnet…
We report the discovery of a massive protostar M17~MIR embedded in a hot molecular core in M17. The multiwavelength data obtained during 1993--2019 show significant mid-IR (MIR) variations, which can be split into three stages: the decreasing phase during 1993.03--mid-2004, the quiescent phase from …
The Lijiang 2.4-meter telescope, as the largest-aperture general-purpose optical telescope currently in China, plays a very important role in nighttime astronomical observations in China. According to the overall observation time allocation in recent years, spectroscopic observations with the Yunnan…
A detailed analysis of RFI mitigation strategies employed by radio observatories both domestically and internationally is presented, specifically addressing the problem of radio frequency interference (RFI) in radio astronomy observations. Based on the RFI issues encountered during actual observatio…
This paper addresses the deficiencies in detection methods for the electromagnetic quiet zone surrounding radio astronomy observations and proposes a radio interference monitoring method based on a four-antenna linear array, aiming to real-time monitor the presence of interference sources in the ele…
High-energy gamma-ray detection represents one of the primary approaches for investigating extreme astrophysical phenomena. Space-based high-energy gamma-ray detection provides exceptional advantages, including wide energy band coverage, excellent temporal continuity, and high energy resolution. Bui…
The volume of candidate diagnostic images generated by FAST pulsar searches is increasing exponentially, posing significant challenges to scientific data management and necessitating urgent research into compression methods to enable efficient storage and accelerated network transmission and sharing…
In large-scale structural health monitoring systems, temperature sensor failures can pose safety hazards. Based on the active reflector health monitoring system of the FAST project, we extracted and analyzed the linear correlations among data from nine measurement points, grouped candidate variables…
The core of the Titius-Bode law is commensurability. According to the principle of commensurability, for earthquakes, the extrapolated commensurable points on their temporal axis correspond to the potential occurrence times of future earthquakes, which constitutes the scientific basis for earthquake…
As the volume of data acquired by space astronomical satellites continues to grow, data applications are playing an increasingly significant role. In existing ground systems for astronomical satellites, data storage methods and organization approaches vary considerably, with data volumes reaching pe…
Remote observatories offer advantages such as high observation efficiency and low operating costs, making remote observation applications increasingly widespread. The development of 5G network technology has enabled remote observation using mobile terminals such as smartphones, while advancements in…
To promote the application of Global Navigation Satellite Systems (GNSS) in the international aviation domain, the International Civil Aviation Organization (ICAO) is conducting research, validation, and upgrade activities for Standards and Recommended Practices (SARPs) applicable to the BeiDou Navi…
