A5073074589- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Advanced Vision and Imaging
- Plant Water Relations and Carbon Dynamics
- Ion-surface interactions and analysis
- Adaptive optics and wavefront sensing
- Silicon Nanostructures and Photoluminescence
- Ionosphere and magnetosphere dynamics
- Atmospheric aerosols and clouds
- Semiconductor materials and devices
- Astronomical Observations and Instrumentation
- Remote Sensing in Agriculture
- Scientific Research and Discoveries
- Data Visualization and Analytics
- Luminescence and Fluorescent Materials
- Astrophysics and Cosmic Phenomena
- Cancer, Lipids, and Metabolism
- CCD and CMOS Imaging Sensors
- Inertial Sensor and Navigation
- Glutathione Transferases and Polymorphisms
- Lanthanide and Transition Metal Complexes
The First People's Hospital of Zhaoqing
2025
Chinese University of Hong Kong
2022-2024
University of Science and Technology of China
2016-2023
Harbin Institute of Technology
2023
University of Science and Technology Chittagong
2020-2022
Kyushu University
2020-2021
Okinawa Institute of Science and Technology Graduate University
2020-2021
University of Massachusetts Amherst
2020
Chinese Academy of Sciences
1998-2018
Galaxies, Etoiles, Physique et Instrumentation
2018
Classification of galaxy morphology is a challenging but meaningful task for the enormous amount data produced by next-generation telescope. By introducing adaptive polar coordinate transformation, we develop rotationally invariant supervised machine learning (SML) method that ensures consistent classifications when rotating images, which always required to be satisfied physically difficult achieve algorithmically. The compared with conventional augmentation including additional rotated...
Quasar outflows may play a crucial role in regulating the host galaxy, although spatial scale of quasar remain major enigma, with their acceleration mechanism poorly understood. The kinematic information outflow is key to understanding its origin and mechanism. Here, we report galactocentric distances different components for both sample an individual quasar. We find that distance increases velocity, typical value from several parsecs more than one hundred parsecs, providing direct evidence...
In order to obtain morphological information of unlabeled galaxies, we present an unsupervised machine-learning (UML) method for classification which can be summarized as two aspects: (1) the methodology convolutional autoencoder (CAE) is used reduce dimensions and extract features from imaging data; (2) bagging-based multiclustering model proposed classifications with high confidence at cost rejecting disputed sources that are inconsistently voted. We apply this on sample galaxies $H<24.5$...
Although photocatalytic technology is applied in water treatment, the challenge still exists due to its low performance. Herein, a reactor coupled with nanobubbles (NBs) developed degrade organic pollutants wastewater. The contains Ti mesh coated TiO2 nanotube arrays as photocatalyst. introduction of NBs increases dissolved oxygen content enhance exhibits outstanding performance, and degradation ability Rhodamine B 95.39% after 2 h irradiation treatment. also shows excellent photodegradation...
The identification of suitable biomarkers holds significant clinical importance for the early detection benign prostatic hyperplasia (BPH) and prostate cancer (PCa). This study aimed to conduct a comprehensive analysis relationship between BPH blood urine (BUB), as well PCa BUB. Candidate single nucleotide polymorphisms associated with or were derived from recent genome-wide association studies. UK Biobank cohort comprised 363,228 individuals BUB test data, enabling calculation polygenic...
Abstract The high-cadence survey of the Zwicky Transient Facility (ZTF) has completely dominated discovery tidal disruption events (TDEs) in past few years and resulted largest sample TDEs with optical/UV light curves well sampled around their peaks, providing us an excellent opportunity to construct a peak luminosity function (LF) flares (TDFs). new construction is necessary particularly considering that most updated LF reported literature been inferred from only 13 sources five different...
Intense short-wavelength photoluminescence (PL) observed at room temperature from thermal SiO2 films co-implanted with Si and C is reported. A flat profile was first implanted, followed by 1100 °C annealing for 60 min. ions were subsequently used to be implanted into the same depth region. PL as-implanted samples without annealing. The intensity increases temperature. Comparing spectra dynamics of C-implanted, annealed, Si-implanted (CIASI) those Si- C-implanted suggests that interaction in...
Using recently acquired HST NIR observations (J, Pa$\beta$ and H bands) of the nearby galaxy NGC1313, we investigate timescales required by a young star cluster to emerge from its natal cloud. We search for extincted clusters, potentially embedded in their cloud as either: 1. compact sources regions with high H$\alpha$/Pa$\beta$ extinctions; 2. HII that appear point-like emission map. The NUV--optical--NIR photometry candidate clusters is used derive ages, masses extinctions via...
Abstract The Beijing–Arizona Sky Survey (BASS) is a wide and deep imaging survey that covers 5400 deg 2 area in the northern Galactic cap with 2.3 m Bok telescope using two filters ( g r bands). Mosaic z -band Legacy (MzLS) same band 4 Mayall telescope. These surveys will be used for spectroscopic targeting by Dark Energy Spectroscopic Instrument (DESI) northernmost portion of DESI footprint. This paper describes third data release (DR3) BASS, which contains photometric from all BASS MzLS...
The spectra of emission-line galaxies (ELGs) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) Sloan Digit Sky (SDSS) are used to study mass-metallicity relation (MZR) at $z\sim0.8$. selected sample contains about 180,000 massive star-forming with $0.6 < z 1.05$ and $9 {\rm log}(M_{\star}/M_{\odot}) 12$. stacked in bins different parameters including redshift, stellar mass, star formation rate (SFR), specific (sSFR), half-light radius, mass density, optical color. average MZR...
Abstract Morphological classification conveys abundant information on the formation, evolution, and environment of galaxies. In this work, we refine a two-step galaxy morphological framework ( USmorph ), which employs combination unsupervised machine-learning supervised techniques, along with self-consistent robust data-preprocessing step. The updated method is applied to galaxies I mag < 25 at 0.2 z 1.2 in COSMOS field. Based their Hubble Space Telescope/Advanced Camera for Survey -band...
In non-star-forming, passively evolving galaxies, regions with emission lines dominated by low-ionization species are classified as Low-Ionization Emission Regions (LIERs). The ionization mechanism behind such has long been a mystery. Active Galactic Nuclei (AGNs), which were once believed to be the source, have found not dominant mechanism, especially in distant from galaxy nuclei. remaining candidates, photoionization post-Asymtopic Giant Branch (pAGB) stars and interstellar shocks can...
The metallicity and its relationship with other galactic properties is a fundamental probe of the evolution galaxies. In this work, we select about 750,000 star-forming spatial pixels from 1122 blue galaxies in MaNGA survey to investigate global stellar mass - local surface density gas-phase ($M_*$ $\Sigma_*$ $Z$ ) relation. At fixed $M_*$, increases steeply increasing $\Sigma_*$. Similarly, at $\Sigma_*$, strongly $M_*$ low end, while trend becomes less obvious high end. We find be more...
Abstract The stellar mass–metallicity relation ( M ⋆ – Z ; MZR) indicates that the metallicities of galaxies increase with increasing masses. fundamental metallicity (FMR) suggests higher star formation rates (SFRs) tend to have lower for a given mass. To examine whether MZR and FMR still hold at poorer redshifts, we compile sample 35 star-forming (SFGs) 0.6 < z 0.9 using public spectral database (v5_10_0) emission-line from extended Baryon Oscillation Spectroscopic Survey. These are...
Aims: There is a spatially resolved star-forming main sequence (rSFMS) and mass-metallicity relation (rMZR) of galaxies in local universe. We know that the global (MZR) results from integral rMZR, it will evolve with redshift. However, evolution rMZR redshift still unclear due to low spatial resolution signal-to-noise ratio. are currently too few observations beyond universe, only simulations can reproduce Methods: In this work, we select ten emission-line an average $z\sim 0.26$ MUSE-Wide...
Abstract By applying our previously developed two-step scheme for galaxy morphology classification, we present a catalog of H -band-selected massive galaxies in the COSMOS-DASH field, which includes 17,292 with stellar mass M ⋆ > 10 ⊙ at 0.5 < z 2.5. The classification is designed to provide complete via combination two machine-learning steps. We first use an unsupervised method (i.e., bagging-based multiclustering) cluster into five categories: spherical (SPH), early-type disk,...
Abstract By utilizing the spatially resolved photometry of galaxies at 0.2 < z 3.0 in CEERS field, we estimate and unresolved stellar mass via fitting spectral energy distribution (SED) to study discrepancy between them. We first compare M * derived from with without JWST wavelength coverage find that can be overestimated by up dex when lacking rest-frame near-infrared (NIR) data. The SED process tends overestimate both age dust attenuation absence NIR data, consequently leading a larger...
Abstract The spectra of 413 star-forming (or H ii ) regions in M33 (NGC 598) were observed using the multifiber spectrograph Hectospec at 6.5 m Multiple Mirror Telescope. Using this homogeneous sample, we measured intensities emission lines and some physical parameters, such as electron temperatures, densities, metallicities. Oxygen abundances derived via direct method (when available) two empirical strong-line methods, namely, O3N2 N2. At high-metallicity end, oxygen from calibration higher...
Abstract By using the Hectospec 6.5 m Multiple Mirror Telescope and 2.16 telescope of National Astronomical Observatories, Chinese Academy Sciences, we obtained 188 high signal-to-noise ratio spectra <?CDATA ${\rm{H}}\,{\rm{II}}$?> regions in nearby galaxy M101, which is largest spectroscopic sample for this so far. These cover a wide range on enables us to analyze two-dimensional distributions its physical properties. The parameters are derived from emission lines or stellar continua,...
Abstract Hot dust-obscured galaxies (hot DOGs) are a population of hyperluminous, heavily obscured quasars discovered by the Wide-field Infrared Survey Explorer all-sky survey at high redshift. Observations suggested growth these may be driven mergers. Previous environmental studies have statistically shown hot DOGs reside in dense regions. Here we use Very Large Telescope narrowband and broadband imaging to search for Ly α emitters (LAEs) <mml:math...
We investigate the spatially-resolved star formation main sequence in star-forming galaxies (SFGs) using Integral Field Spectroscopic (IFS) observations from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. demonstrate that correlation between stellar mass surface density ($\Sigma_*$) and rate ($\Sigma_{\mathrm{SFR}}$) holds down to sub-galactic scale, leading Sub-Galactic Main Sequence (SGMS). By dividing into two populations based on their recent assembly modes, we find...
Abstract Recent simulation studies suggest that the compaction of star-forming galaxies (SFGs) at high redshift might be a critical process, during which central bulge is being rapidly built, followed by quenching star formation. To explore dust properties SFGs with compact morphology, we investigate dependence temperature, T , on their size and formation activity, using sample massive <?CDATA $\mathrm{log}({M}_{* }/{M}_{\odot })\gt 10$?> 1 < z 3, drawn from 3D-HST/CANDELS database in...
Abstract We study the relations between gas-phase metallicity ( Z ), local stellar mass surface density (Σ * and star formation SFR ) in a sample of 1120 star-forming galaxies from MaNGA survey. At fixed Σ increases as decreases or vice versa for calibrators N2 O3N2. Alternatively, at increases, but high region, trend is flatter. However, dependence on nearly disappears N2O2 N2S2 calibrators. investigate against with different find negative/positive correlations depending choice calibrator....
Abstract The state-of-the-art geometry models of stars/dust suggest that dust attenuation toward nebular regions ( <?CDATA ${A}_{V,\mathrm{gas}}$?> ) is always larger than stellar ${A}_{V,\mathrm{star}}$?> ). Utilizing the newly released integral field spectroscopic data from Mapping Nearby Galaxies at Apache Point Observatory survey, we investigate whether and how ${A}_{V,\mathrm{star}}/{A}_{V,\mathrm{gas}}$?> ratio varies subgalactic to galactic scales. On a scale, report stronger...
We present a sample of 48 metal-poor galaxies at $ z < 0.14$ selected from 92,510 in the LAMOST survey. These are identified for their detection auroral emission line \oiii$\lambda$4363 above $3\sigma$ level, which allows direct measurement electron temperature and oxygen abundance. The fluxes corrected internal dust extinction using Balmer decrement method. With derived \oiii$\lambda\lambda4959,5007/\oiii\lambda4363$ density $\sii\lambda6731/\sii\lambda6717$, we obtain abundances our range...