A5011507862- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- GNSS positioning and interference
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Advanced Electrical Measurement Techniques
- Antenna Design and Optimization
- Transportation Safety and Impact Analysis
- Inertial Sensor and Navigation
- Scientific Research and Discoveries
- Scientific Measurement and Uncertainty Evaluation
- Magnetic Bearings and Levitation Dynamics
- Electrical and Electromagnetic Research
- Geotechnical and Geomechanical Engineering
- Geophysics and Gravity Measurements
Shandong University
2012-2024
Chinese Academy of Sciences
2006-2021
National Astronomical Observatories
2006-2021
Australian National University
2016-2017
Weihai Science and Technology Bureau
2008-2013
The spiral structure of our Milky Way Galaxy is not yet known. HII regions and giant molecular clouds are the most prominent tracers. We collected tracer data from literature, namely, (GMCs). With weighting factors based on excitation parameters or masses GMCs, we fitted distribution these tracers with models two, three, four spiral-arms polynomial arms. distances tracers, if available stellar direct measurements, were estimated kinetically standard rotation curve Brand & Blitz (1993)...
(Abridged) Polarization measurements of the Galactic plane at lambda6 cm probe interstellar medium (ISM) to larger distances compared longer wavelengths, hence enable us investigate properties magnetic fields and electron density. We are conducting a new continuum polarization survey covering 10degr < l 230degr |b|<5degr. Missing large-scale structures in U Q maps restored based on extrapolated K-band from WMAP satellite. The data analyzed together with other bands. discuss some...
<i>Context. <i/>Linearly polarized Galactic synchrotron emission provides valuable information about the properties of magnetic field and interstellar magneto-ionic medium, when Faraday rotation along line sight is properly taken into account.<i>Aims. <i/>We aim to survey plane at <i>λ<i/>6 cm including linear polarization. At such a short wavelength effects are in general small can be probed larger distances than long wavelengths.<i>Methods. <i/>The Urumqi 25-m telescope used for sensitive...
ABSTRACT We reanalyse the recent compilation of distance measurements to M87 by collecting data from published literature. Different traditional statistical methods, based on principle minimum information loss, we use a robust most frequent value (MFV) procedure estimate M87, irrespective Gaussian or non-Gaussian distributions. The MFV-based for modulus is given $31.09^{+0.04}_{-0.03}$ (statistical) $^{+0.05}_{-0.07}$ (systematic) mag corresponding 68.27 per cent confidence interval, whereas...
Context. Evidence for a spectral flattening of the supernova remnant (SNR) HB3 (G132.7+1.3) was recently claimed in literature based on previously published total flux density data, and further interpreted as discovery thermal bremsstrahlung emission shell HB3.
We constructed a comprehensive model atom for NeI -- NeII using the most up-to-date atomic data available and evaluated non-local thermodynamic equilibrium (NLTE) line formation in classical 1D models representing atmospheres of B-type stars. find that large NLTE strengthening lines corresponding to 2p$^5$3p $-$ 2p$^5$3s transitions array occurs due extremely small photoionization cross-sections levels leads strong overpopulation these relative their LTE populations. The deviations from are...
Due to an error in the plotting software B-bars Figs.3,9 and 13 paper were not correctly displayed.The problem
Aims. We aim to measure the metallicity distribution and velocity of red giant branch (RGB) stars along Sagittarius dwarf galaxy (Sgr) streams. Thanks large number Sloan Digital Sky Survey (SDSS) sample, we can study properties streams as a function Λ⊙ from Sgr core.
We have finished the 6cm polarization survey of Galactic plane using Urumqi 25m radio telescope. It covers 10deg<l<230deg in longitude and |b| <5deg latitude. The new maps not only reveal properties diffuse magnetized interstellar medium, but also are very useful for studying individual objects such as Hii regions, which may act Faraday screens with strong regular magnetic fields inside, supernova remnants their spectra. high sensitivity enables us to discover two SNRs G178.2-4.2 G25.3-2.1 a...
Abstract We investigated the observational properties of Triangulum-Andromeda (TriAnd), Monoceros Ring (MRi), and Anti-Center Stream (ACS) in anticenter region using K giants, M RGB stars from LAMOST SDSS survey. The Friends algorithm was applied to select member these structures. found a new spur TriAnd at l ∼ 133° based on selected this work compiled literature. distributions radial velocity proper motion its indicate that is gradually moving away Sun. comparisons [Fe/H] [ α /Fe] between...
Aims . Double white dwarf (DWD) binaries are one of the channels through which type Ia supernovae explosions occur. With release more and sky survey data, search for additional DWDs has become a possibility. We utilized spectroscopic data from SDSS DR14 to DWD based on variations in radial velocities (RVs). Methods obtained sample 4089 DA dwarfs (WDs) with two or spectra DR14, their RVs were derived using cross-correlation function. Using chi-squared ( χ 2 ) distribution as base, we...
We discovered three large HII regions: G148.8+2.3, G149.5+0.0 and G169.9+2.0 in the Sino-German λ6 cm polarization survey of Galactic plane. They have been identified based on flat spectral indexes strong infrared emission properties.
We have observed 79 supernova remnants (SNRs) with the Urumqi 25m telescope at 6cm during Sino-German polarization survey of Galactic plane. measured flux densities SNRs 6cm, some which are first ever or measurements highest frequency, so that we can determine improve spectra SNRs. Our observations ruled out spectral breaks flattening were suggested for a few SNRs, and confirmed break S147. By combining our maps 11cm 21cm from Effelsberg 100 m telescope, calculated index several large For...
We select 947 star-forming galaxies from SDSS-DR7 with [O~{\sc iii}]$\lambda$4363 emission lines detected at a signal-to-noise {ratio }larger than 5$\sigma$. Their electron temperatures and direct oxygen abundances are {then }determined. {W}e compare the results different methods. $t_2${, the} temperature in {the }low ionization region{,} estimated $t_3${, that} }high {is} compared {using} three analysis relations between $t_2-t_3${. These} show obvious differences, which result some ionic...
After Prof. R. Wielebinski visited China in 1999, we started to plan the Sino-German λ6 cm polarization survey of Galactic plane, using Urumqi 25-m radio telescope Xinjiang (formerly Urumqi) Astronomical Observatory, Chinese Academy Sciences. It is a high-frequency complement previous Effelsberg 21-cm and 11-cm surveys, same observing processing methods. The located at an altitude 2029 m above sea level geographic longitude 87°E latitude 43°N. dual-channel receiver with polarimeter bandwidth...
By using Data Analysis Pipeline (DAP) products of Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), which are publicly available from the SDSS Release 15, we analyze local properties SN explosion sites and global different types host galaxies to explore environments SNe. In our sample, there 67 in field view MaNGA, including 32 Type Ia, 29 CCSNe, 1 super-luminous (SLSN), I 4 unclassified type SNe, with can perform K-S test for analysis derive statistically robust results. Due...
<p indent=0mm>Radio continuum polarization observation is a powerful tool to study the properties of Galactic interstellar medium. By using 25-m radio telescope Xinjiang Astronomical Observatories Chinese Academy Sciences Sino-German 6 cm survey plane was carried out by National and Max-Planck-Institute for Radio Astronomy. The observed sky coverage in region from 10° 230° longitude within ±5° latitude. far at highest frequency conducted ground-based telescope. Through ten-year efforts...
Abstract We gather a sample of both metal-rich and low metallicity galaxies. Both them have oxygen abundances estimated from electron temperature (Te). They spread in wide stellar mass range 10 6 M ⊙ to 11 . Then, consistent relation are derived for such masses. This also shows clearly the discrepancy Te-based those strong-line method.
We obtained spectroscopy data for 761 Degenerate A (DA)white dwarfs (WDs) with multiple LAMOST observations. The radial velocity (RV) of each spectrum was calculated using the cross-correlation function method (CCF), and 60 DA WD binary candidates were selected based on variation RV. Then, atmosphere parameter Teff, logg, mass these WDs estimated by Balmer line fitting interpolation in theoretical evolution tracks, respectively. Our parameters are consistent those from SDSS Gaia common...