A5073436334- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Advanced Combustion Engine Technologies
- Astronomical Observations and Instrumentation
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Migration, Aging, and Tourism Studies
- Gamma-ray bursts and supernovae
- Phase Equilibria and Thermodynamics
- Astrophysics and Cosmic Phenomena
- Diverse Aspects of Tourism Research
- Photorefractive and Nonlinear Optics
- Atmospheric and Environmental Gas Dynamics
- Quantum, superfluid, helium dynamics
- Solid State Laser Technologies
- Rural development and sustainability
- Cold Atom Physics and Bose-Einstein Condensates
- Cruise Tourism Development and Management
Peking University
2015-2024
Kavli Institute for Theoretical Sciences
2018-2024
Shunde Polytechnic
2016-2023
Beijing Shijitan Hospital
2022
Capital Medical University
2022
Max Planck Institute for Radio Astronomy
2015
Max Planck Society
2015
Nanjing University of Science and Technology
2013
Nanjing Medical University
2013
Sun Yat-sen University
2011-2012
We present Submillimeter Array (SMA) λ = 0.88 and 1.3 mm broad-band observations, Very Large (VLA) observations in NH3 (J, K) (1,1) up to (5,5), H2O CH3OH maser lines towards the two most massive molecular clumps infrared dark cloud (IRDC) G11.11−0.12. Sensitive high-resolution images reveal hierarchical fragmentation dense gas from ∼1 pc clump scale down ∼0.01 condensation scale. At each scale, mass of fragments is orders magnitude larger than Jeans mass. This common all four IRDC we...
A statistical study of the properties molecular outflows is performed based on an up-to-date sample. 391 were identified in published articles or preprints before February 28, 2003. The parameters position, morphology, mass, energy, outflow dynamics and central source luminosity are presented for each source. Outflow lobe polarity known all sources, 84% found to be bipolar. sources divided into low mass high groups according either available bolometric mass. pace discovery over past seven...
ABSTRACT We investigate the presence of hub-filament systems in a large sample 146 active proto-clusters, using H13CO+ J = 1-0 molecular line data obtained from ATOMS survey. find that filaments are ubiquitous and very common dense core scales (∼0.1 pc) to clump/cloud (∼1–10 pc). The proportion proto-clusters containing decreases with increasing dust temperature (Td) luminosity-to-mass ratios (L/M) clumps, indicating stellar feedback H ii regions gradually destroys as evolve. Clear velocity...
ABSTRACT We present ALMA Band-3/7 observations towards ‘the Heart’ of a massive hub-filament system (HFS) SDC335, to investigate its fragmentation and accretion. At resolution ∼0.03 pc, 3 mm continuum emission resolves two dense cores MM1 MM2, with $383(^{\scriptscriptstyle +234}_{\scriptscriptstyle -120})$ M⊙ (10–24 % mass Heart’) $74(^{\scriptscriptstyle +47}_{\scriptscriptstyle -24})$ M⊙, respectively. With down 0.01 0.87 shows further fragments into six condensations multi-transition...
ABSTRACT We present a statistical study of sample 17 hub-filament-system (HFS) clouds high-mass star formation using high-angular resolution (∼1–2 arcsec) ALMA 1.3 and 3 mm continuum data. The includes eight infrared (IR)-dark nine IR-bright types, which correspond to an evolutionary sequence from the IR-dark stage. central massive clumps their associated most cores are observed follow trend increasing mass (M) surface density (Σ) with evolution In addition, mass-segregated cluster young...
We present Submillimeter Array (SMA) \lambda = 0.88mm observations of an infrared dark cloud (IRDC) G28.34+0.06. Located in the quiescent southern part G28.34 cloud, region interest is a massive ($>10^3$\,\msun) molecular clump P1 with luminosity $\sim 10^3$ \lsun, where our previous SMA at 1.3mm have revealed string five dust cores 22-64 \msun\ along 1 pc IR-dark filament. The are well aligned position angle 48 degrees and regularly spaced average projected separation 0.16 pc. new...
Abstract How mass is accumulated from cloud-scale down to individual stars a key open question in understanding high-mass star formation. Here, we present the accumulation process hub-filament cloud G22 that composed of four supercritical filaments. Velocity gradients detected along three filaments indicate they are collapsing with total infall rate about 440 M ⊙ Myr −1 , suggesting hub would be doubled six free-fall times, adding up ∼2 Myr. A fraction masses central clumps C1 and C2 can...
A survey toward 674 Planck cold clumps of the Early Cold Core Catalogue (ECC) in J = 1–0 transitions 12CO, 13CO, and C18O has been carried out using Purple Mountain Observatory 13.7 m telescope. Six hundred seventy-three were detected with 12CO 13CO emission, 68% sample emission. Additional velocity components also identified. close consistency three line peak velocities was revealed for first time. Kinematic distances are given all components, half located within 0.5 1.5 kpc. Excitation...
The "ATOMS," standing for {\it ALMA Three-millimeter Observations of Massive Star-forming regions}, survey has observed 146 active star forming regions with Band 3, aiming to systematically investigate the spatial distribution various dense gas tracers in a large sample Galactic massive clumps, study roles stellar feedback formation, and characterize filamentary structures inside clumps. In this work, observations, data analysis, example science "ATOMS" are presented, using case G9.62+0.19...
A transition in theoretical orientation from migration to mobility the study of geographical and social movement contemporary China highlights resonates with significant political, cultural transformations past 40 years. Changes patterns also reveal a shift production-led peasant worker migration, which has dominated international academic studies on few decades focus working individuals driven by market forces, more individualized diverse consumption-led mobility. Although mobilities...
We present a comprehensive study of the gas kinematics associated with density structures at different spatial scales in filamentary infrared dark cloud, G034.43+00.24 (G34). This makes use H13CO+ (1-0) molecular line data from ALMA Three-millimeter Observations Massive Star-forming regions (ATOMS) survey, which has and velocity resolution 0.04 pc 0.2 km/s, respectively. Several tens dendrogram have been extracted position-position-velocity space H13CO+, include 21 small-scale leaves 20...
We present a survey of the 616-523 H2O maser transition toward sample 140 compact cores in infrared dark clouds using Very Large Array. Strong (>1 Jy) emission was found associated with 17 cores, indicative star formation these cores. infer that masers have embedded protostars. Cores masses 12 to 2 × 103 M☉, similar mass range entire sample. The detection rate (12%) compact, cold is much lower than high-mass protostellar objects and ultracompact H II regions. significantly higher for suggest...
The dense molecular clump P1 in the infrared dark cloud (IRDC) complex G28.34+0.06 harbors a massive protostellar cluster at its extreme youth. Our previous Submillimeter Array (SMA) observations revealed several jet-like CO outflows emanating from protostars, indicative of intense accretion and potential interaction with ambient natal materials. Here we present Expanded Very Large (EVLA) spectral line toward NH3 (J,K) = (1,1), (2,2), (3,3) lines, as well H2O class I CH3OH masers. Multiple...
The low dust temperatures (<14 K) of Planck Galactic cold clumps (PGCCs) make them ideal targets to probe the initial conditions and very early phase star formation. "TOP-SCOPE" is a joint survey program targeting ∼2000 PGCCs in J = 1–0 transitions CO isotopologues ∼1000 850 μm continuum emission. objective surveys (SMT 10 m, KVN 21 NRO 45 m) statistically study occurring during formation evolution molecular clouds, across wide range environments. observations, data analysis, example science...
Stellar feedback from high-mass stars (e.g., H{\sc ii} regions) can strongly influence the surrounding interstellar medium and regulate star formation. Our new ALMA observations reveal sequential formation taking place within one sub-virial filamentary clump (the G9.62 clump) in G9.62+0.19 complex. The 12 dense cores (MM 1-12) detected by are at very different evolutionary stages, starless core phase to UC region phase. Three (MM6, MM7/G, MM8/F) associated with outflows. mass-velocity...
We observed 146 Galactic clumps in HCN (4-3) and CS (7-6) with the Atacama Submillimeter Telescope Experiment (ASTE) 10-m telescope. A tight linear relationship between star formation rate gas mass traced by dust continuum emission was found for both high redshift (z>1) forming galaxies (SFGs), indicating a constant depletion time of ~100 Myr molecular z SFGs. However, low do not follow this relation seem to have longer global time. The correlations total infrared luminosities (L_TIR) line...
We have identified 453 compact dense cores in 3 mm continuum emission maps the ATOMS (ALMA Three-millimeter Observations of Massive Star-forming regions) survey, and compiled three catalogues high-mass star forming cores. One catalogue, referred to as H/UC-HII includes 89 that enshroud hyper/ultra (H/UC) HII regions characterized by associated H40alpha emission. A second pure s-cHMC, 32 candidate Hot Molecular Cores (HMCs) showing rich spectra (N>20lines) complex organic molecules (COMs) but...
The warm neutral medium (WNM) was thought to be subsonically/transonically turbulent, and it lacks a network of intertwined filaments that are commonly seen in both molecular clouds cold (CNM). Here, we report HI~21 cm line observations very-high-velocity (-330 km s$^{-1}$ $<V_{\rm LSR}<$ -250 s$^{-1}$) cloud (VHVC), using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) with unprecedented resolution sensitivity. For first time, such VHVC is clearly revealed supersonic WNM...
Acetone (CH_3COCH_3) is a carbonyl-bearing complex organic molecule, yet interstellar observations of acetone remain limited. Studying the formation and distribution CH_3COCH_3 in medium can provide valuable insights into prebiotic chemistry evolution molecules. We explore spatial its correlation with O-bearing molecules acetaldehyde (CH_3CHO) methanol (CH_3OH), as well N-bearing molecule ethyl cyanide (C_2H_5CN), massive protostellar clumps. observed 11 clumps using ALMA at 345 GHz, an...
We present the Submillimeter Array (SMA) observations of molecular lines at 330 and 340 GHz toward G19.61 − 0.23. The SMA have a spatial resolution ∼2'' bandpass 2 × bandwidth. With data, we detected 131 transitions. Ninety-four transitions from 17 species their isotopomers are identified, including complex organic molecules simple linear molecules. Most (CH3OH, 13CH3OH, C2H5OH, HCOOCH3, HNCO, NH2CHO, CH3CN, CH3CH2CN) sufficient number in this observation to allow analysis using rotational...
Magnetic field is one of the key agents that play a crucial role in shaping molecular clouds and regulating star formation, yet complete information on magnetic not well constrained due to limitations observations. We study massive infrared dark cloud G035.39-00.33 from dust continuum polarization observations at 850 $\micron$ with SCUBA-2/POL-2 JCMT. The tends be perpendicular densest part main filament (F$_{M}$), whereas it has less defined relative orientation rest structure, where...
Abstract We observed 13 Planck cold clumps with the James Clerk Maxwell Telescope/SCUBA-2 and Nobeyama 45 m radio telescope. The N 2 H + distribution obtained telescope is quite similar to SCUBA-2 dust distribution. 82 GHz HC 3 N, CCS, 94 CCS emission are often distributed differently respect emission. emission, which known be abundant in starless molecular cloud cores, very clumpy targets. made deep single-pointing observations DNC, HN C, D , cyclic-C toward nine clumps. detection rate of...
We have identified outflows and bubbles in the Taurus molecular cloud based on $\sim 100$ deg$^2$ Five College Radio Astronomy Observatory $^{12}$CO(1-0) $^{13}$CO(1-0) maps Spitzer young stellar object catalogs. In main 44 area of we found 55 outflows, which 31 were previously unknown. also 37 entire 100 Taurus, all had not been before. The total kinetic energy is estimated to be $\bf \sim 3.9 \times 10^{45}$ erg, \textbf{1\%} turbulent energy. detected 9.2 10^{46}$ 29\% Taurus. injection...
ABSTRACT Hot cores characterized by rich lines of complex organic molecules are considered as ideal sites for investigating the physical and chemical environments massive star formation. We present a search hot using typical nitrogen- oxygen-bearing (C2H5CN, CH3OCHO, CH3OH), based on ALMA Three-millimeter Observations Massive Star-forming regions (ATOMS). The angular resolutions line sensitivities observations better than 2 arcsec 10 mJy beam−1, respectively. A total 60 identified with 45...