A5110673006- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Advanced Optical Sensing Technologies
- Astronomy and Astrophysical Research
- Nonlinear Waves and Solitons
- Optical Systems and Laser Technology
- Stellar, planetary, and galactic studies
- Nonlinear Photonic Systems
- Surface Roughness and Optical Measurements
- Geophysics and Gravity Measurements
- Advanced Fluorescence Microscopy Techniques
- Photonic and Optical Devices
- Scientific Research and Discoveries
- Differential Equations and Numerical Methods
- Pulsars and Gravitational Waves Research
- Quantum Mechanics and Non-Hermitian Physics
- Plant Water Relations and Carbon Dynamics
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
Baise University
2017-2020
Wuhan Donghu University
2016-2019
Abstract Intrinsic associated absorption lines (AALs) in quasar spectra play a crucial role providing insights into the chemical and physical properties of outflows, host galaxies, their surrounding interstellar medium. Affected by complexity overlap with emission profiles, there are still many challenges to effectively measure AALs massive data, which significantly limits benefits spectroscopic surveys. In this study, we first constructed reliable sample 3000 containing only narrow lines,...
Abstract In this Letter, we report the discovery of a strong correlation between variability narrow absorption lines (NALs) and ionizing continuum from two-epoch spectral sample 40 quasars containing 52 variable C iv λλ1548, 1551 doublets. According to concordance index, is classified into two subsamples. Subsample I shows an anti-correlation variations continuum, while II exhibits positive correlation. These results imply that these doublets are intrinsic corresponding their caused...
Abstract Using the quasar spectra from Sloan Digital Sky Survey, all with two-epoch to six-epoch observations, we search for C IV λλ 1548,1551 narrow absorption doublets in spectral data blue wing υ r = 30,000 km s −1 until red of λ 1549 emission lines. We have obtained 21,239 line (NAL) systems, which 647 systems were significantly changed on timescales ΔMJD 0.24 1842.38 days at rest-frame. Both samples NAL multi-epoch observations and variable are largest ones date. The offset velocity...
Abstract Using the SDSS spectra of quasars included in DR7Q or DR12Q catalogs, we search for Mg ii λλ 2796, 2803 narrow absorption doublets data around λ 2798 emission lines. We obtain 17,316 doublets, within redshift range 0.3299 ≤ z abs 2.5663. find that a velocity offset υ r < 6000 km s −1 is safe boundary to constrain vast majority associated systems, although some at > . If absorbers are defined by , ∼33.3% supposed be contaminants intervening systems. Removing 33.3% contaminants,...
Abstract The Gravitational wave burst high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission for monitoring transients. Here we report the design of GECAM Scientific Ground Segment (GSGS) in terms scientific requirements, including architecture, external interfaces, main function, and workflow. Judging from analysis verification results during commissioning phase, GSGS functions well able to monitor status payloads, adjust parameters, develop observation...
Abstract Correlations between the variations of quasar absorption lines and ionizing continuum have been confirmed recently in systematic studies. However, no convincing individual case is reported. We present a statistical analysis variable C iv broad line (BAL) SDSS J141007.74+541203.3, which has observed with 44 epochs by Sloan Digital Sky Survey Data Release 14. Grier et al. concluded that most likely cause variability BAL J141007.74+541203.3 rapid response to changes incident continuum....
We report, for the first time, both strengthening and radial velocity increases of a narrow absorption-line (NAL) system (C iv λλ1548, 1551 N v λλ1239, 1243) from two-epoch spectra quasar SDSS J143530.49+142338.4. First, we speculate that ionization changes outflow clouds are likely cause in its equivalent width (EW) based on obvious weakening continuum, although other interpretations cannot be ruled out current spectra. According to cloudy simulation, asynchronized variations between EWs...
Considering the requirement of measurement for video probe, a method that uses line-structured laser to measure points, lines and surfaces object is presented. The light imaging model built, where linear used as an auxiliary source irradiating on surface object. Compared image, proportional coefficient calibrated with multiplying factor in different distance line position. geometry parameters are calculated based platform. experimental results show measuring error less than 10%, suitable...
Using the SDSS spectra of quasars included in DR7Q or DR12Q catalogs, we search for Mg II narrow absorption doublets data around emission lines. We obtain 17,316 doublets, within redshift range 0.3299<= z_abs <= 2.5663. find that a velocity offset v_r < 6000 km/s is safe boundary to constrain vast majority associated systems, although some at > km/s. If absorbers are defined by km/s, ~33.3% supposed be contaminants intervening systems. Removing 33.3% contaminants, ~4.5% present least one...