A5047750405- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Molecular Spectroscopy and Structure
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Radio Astronomy Observations and Technology
- Fungal Biology and Applications
- Astronomical Observations and Instrumentation
- Advanced Combustion Engine Technologies
- Pulsars and Gravitational Waves Research
- Fire Detection and Safety Systems
- Atomic and Molecular Physics
- Light effects on plants
- Spectroscopy and Laser Applications
- Image Enhancement Techniques
- Video Surveillance and Tracking Methods
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- GNSS positioning and interference
- Quantum, superfluid, helium dynamics
Beijing Forestry University
2024
State Forestry and Grassland Administration
2024
Tianjin University of Science and Technology
2024
Max Planck Institute for Astronomy
2010-2021
Chinese Academy of Sciences
2012-2017
Purple Mountain Observatory
2010-2017
Yunnan Observatories
2016
University of Geneva
2015
Wuhan Botanical Garden
2012
University of Chinese Academy of Sciences
2010-2012
Context: The past decade has witnessed a large number of Galactic plane surveys at angular resolutions below 20". However, no comparable high-resolution survey exists long radio wavelengths around 21cm in line and continuum emission. Methods: Employing the Very Large Array (VLA) C-array configuration program, we observe HI line, four OH lines, nineteen Halpha recombination lines as well emission from 1 to 2GHz full polarization over part first quadrant. Results: Covering longitudes 14.5...
Abstract We have performed a multiwavelength study of supernova remnant (SNR) G57.2+0.8 and its environment. The SNR hosts the magnetar SGR 1935+2154, which emitted an extremely bright millisecond-duration radio burst on 2020 April 28. used 12 CO 13 J = 1–0 data from Milky Way Image Scroll Painting line survey to search for molecular gas associated with G57.2+0.8, in order constrain physical parameters (e.g., distance) magnetar. report that is likely impacting clouds (MCs) at local standard...
There is a considerable deficiency in the number of known supernova remnants (SNRs) Galaxy compared to that expected. Searches for extended low-surface brightness radio sources may find new Galactic SNRs, but confusion with much larger population HII regions makes identifying such features challenging. SNRs can, however, be separated from using their significantly lower mid-infrared (MIR) continuum intensity ratios. We use combination high-resolution 1-2 GHz data The HI, OH, Recombination...
With the $Karl~G.~Jansky$ Very Large Array (VLA) in C-configuration, we observed a large portion of first Galactic quadrant ($l=14.0-67.4^\circ $ and $\lvert b \rvert \leq 1.25^\circ $) achieving an angular resolution $\leq 40^{\prime\prime}$. At $L$ Band, WIDAR correlator at VLA was set to cover 21~cm HI line, four OH transitions, series H$n\alpha$ radio recombination lines (RRLs; $n=151$ 186), eight 128~MHz wide continuum spectral windows (SPWs) simultaneously. The emission shows clear...
We present near-infrared multi-object spectroscopy and JHKs imaging of the massive stellar content Galactic star-forming region W3 Main, obtained with LUCI at Large Binocular Telescope. confirm 15 OB stars in Main derive spectral types between O5V B4V from their absorption line spectra. Three Young Stellar Objects are identified by emission spectra excess. The color-color diagram detected sources allows a detailed investigation slope extinction law towards Main. Analysis Hertzsprung Russell...
We present 13 high-precision and four additional light curves of bright southern-hemisphere transiting planetary systems: WASP-22, WASP-41, WASP-42 WASP-55. In the cases WASP-55, these are first follow-up observations since their discovery papers. refined measurements physical properties orbital ephemerides all systems. No indications transit timing variations were seen. All planets have radii inflated above those expected from theoretical models gas-giant planets; WASP-55b is most...
We report the results of our observations S255IR area with SMA at 1.3 mm in very extended configuration and 0.8 compact as well IRAM-30m mm. The best achieved angular resolution is about 0.4 arcsec. dust continuum emission several tens molecular spectral lines are observed. majority detected only towards S255IR-SMA1 clump, which represents a rotating structure (probably disk) around young massive star. still insufficient for conclusions Keplerian or non-Keplerian character rotation....
Radio continuum surveys of the Galactic plane can find and characterize HII regions, supernova remnants (SNRs), planetary nebulae (PNe), extragalactic sources. A number at high angular resolution (<25") different wavelengths exist to study interstellar medium (ISM), but no comparable high-resolution high-sensitivity survey exists long radio around 21cm. We observed a large fraction in first quadrant Milky Way (l=14.0-67.4deg |b| < 1.25deg) with Karl G. Jansky Very Large Array (VLA)...
We introduce the histogram of oriented gradients (HOG), a tool developed for machine vision that we propose as new metric systematic characterization spectral line observations atomic and molecular gas study cloud formation models. In essence, HOG technique takes input extended spectral-line from two tracers provides an estimate their spatial correlation across velocity channels. characterized using synthetic H I 13 CO ( J = 1 → 0) emission numerical simulations magnetohydrodynamic (MHD)...
The GLOSTAR survey will study the star formation in Galactic plane between $-2^{\circ}< \textit{l}< 85^{\circ}$ and $|b| < 1^{\circ}$ with unprecedented sensitivity both, flux density ($\sim$ 40 $μJy$ beam$^{-1}$) range of angular scales 1."5 to largest radio structures Galaxy). In this paper we present first results obtained from a continuum map 16 square degree sized region centered on $\textit{l} = 32^{\circ}$ $b 0^{\circ}$ ($28^{\circ} \textit{l} 36^{\circ}$ 1^{\circ}$). This...
We present a study of the filamentary structure in emission from neutral atomic hydrogen (H I ) at 21 cm across velocity channels 40′′ and 1.5-km s −1 resolution position-position-velocity cube, resulting combination single-dish interferometric observations The H /OH/recombination-line survey inner Milky Way. Using Hessian matrix method with tools circular statistics, we find that majority structures are aligned Galactic plane. Part this trend can be assigned to long coherent several...
Cordyceps militaris is widely cultivated for functional food in China and Southeast Asia. Daylight was commonly used development of C. fruit bodies. In this study, effects light wavelengths (pink = 1/3,450–460 nm + 2/3,620–630 nm; red 620–630 blue 450–460 nm) on body's production contents bioactive components were investigated. The results are: pink increased dried matter bioefficiency bodies to the highest (40.06/6.77%) compared with (24.44/4.86%), daylight (22.69/4.55%) (22.06/4.17%),...
Abstract We present a new large-scale (2° × 2°) simultaneous 12 CO, 13 and C 18 O ( J = 1–0) mapping of L1188 with the Purple Mountain Observatory 13.7 m telescope. Our observations have revealed that consists two nearly orthogonal filamentary molecular clouds at clearly separated velocities. Toward intersection showing large velocity spreads, we find several bridging features connecting in velocity, an open arc structure exhibits high excitation temperatures, enhanced CO emission, broad...
Molecular clouds form from the atomic phase of interstellar medium. However, characterizing transition between and molecular medium (ISM) is a complex observational task. Here we address cloud formation processes by combining H I self absorption (HISA) with line data. Column density probability functions (N-PDFs) are common tool for examining clouds. One scenario proposed numerical simulations that N-PDF evolves log-normal shape at early times to power-law-like later times. To date,...
To understand evolutionary and environmental effects during the formation of high-mass stars, we observed three regions massive star at different stages that reside in same natal molecular cloud. Methods. The S255IR, S255N S255S were 1.3 mm with Submillimeter Array (SMA) followup short spacing information was obtained IRAM 30m telescope. Near infrared (NIR) H + K-band spectra continuum observations taken for S255IR VLT-SINFONI to study stellar populations this region. combination millimeter...
As a part of the Milky Way Imaging Scroll Painting (MWISP) survey, we performed simultaneous 12CO(1-0), 13CO(1-0), C18O(1-0) mapping toward molecular clouds in region encompassing 3.75 square degrees. We reveal three clouds, 15 km/s cloud, 27 and 50 surveyed region. The cloud is resolved with an angular resolution around 1' for first time. Investigating their morphology velocity structures, find that likely affected by feedback from stellar association Mon OB3 characterised large expanding...
Context: Atomic and molecular cloud formation is a dynamical process. However, kinematic signatures of these processes are still observationally poorly constrained. Methods: Targeting the cloud-scale environment prototypical infrared dark G28.3, we employ spectral line imaging observations two atomic lines HI [CI] as well in 13CO 1--0 3--2 transitions. The analysis comprises investigations properties different tracers, estimates mass flow rates, velocity structure functions, Histogram...
Context. The hydroxyl radical (OH) is present in the diffuse molecular and partially atomic phases of interstellar medium (ISM), but its abundance relative to hydrogen not clear. Aims. We aim evaluate OH with respect using absorption against cm-continuum sources over first Galactic quadrant. Methods. This study part H I /OH/Recombination line survey inner Milky Way (THOR). THOR a Karl G. Jansky Very Large Array (VLA) large program atomic, ionized gas range 15° ≤ l 67° | b |≤ 1°. It...
The physical and chemical properties of cold dense molecular clouds are key to understanding how stars form. Using the IRAM 30 m NRO 45 telescopes, we carried out a Multiwavelength line-Imaging survey 70 $\mu$m dark bright clOuds (MIAO). At linear resolution 0.1--0.5 pc, this work presents detailed study parsec-scale CO depletion $\rm HCO^+$ deuterium (D-) fractionation toward four sources (G11.38+0.81, G15.22-0.43, G14.49-0.13, G34.74-0.12) included in our full sample. In each source with...
Embedded clusters like W3 Main are complex and dynamically evolving systems that represent an important phase of the star formation process. We aim at characterization entire stellar content in a statistical sense to identify possible differences evolutionary populations find clues about mechanism this massive embedded cluster. Methods. Deep JHKs imaging is used derive disk fraction, Ks-band luminosity functions mass for several subregions Main. A two dimensional completeness analysis using...
Temporal photometric variations at near infrared to submillimeter wavelengths have been found in low-mass young stellar objects. These phenomena are generally interpreted as accretion events of star-disk systems with varying rates. There is growing evidence suggesting that similar luminosity flaring also occurs high-mass star/cluster-forming regions. We report this Letter the rise and fall 900 ${\mu}$m continuum emission newly 349.1 GHz methanol maser massive star forming region S255IR~SMA1...
We investigate at a high angular resolution the spatial and kinematic structure of S255IR mass star-forming region, which demonstrated recently first disk-mediated accretion burst in massive young stellar object. The observations were performed with ALMA Band 7 an $ \sim 0.1^{\prime\prime}$, corresponds to 180 AU. 0.9 mm continuum, C$^{34}$S(7-6) CCH $N=4-3$ data show presence very narrow ($ 1000 AU), dense ($n\sim 10^7$ cm$^{-3}$) warm filamentary structures this area. At least some them...
We present first results for Faraday rotation of compact polarized sources (1 to 2 GHz continuum) in The HI/OH/Recombination line (THOR) survey the inner Galaxy. In Galactic longitude range 39 degr < l 52 degr, we find measures -310 rad/m2 RM +4219 rad/m2, with highest values concentrated within a degree = 48 degrees at Sagittarius arm tangent. Most high RMs arise diffuse plasma, along lines sight that do not intersect HII regions. For > 49 drops off rapidly, while 47 mean is higher larger...