Meizhu Liu
A5091411706- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Spectroscopy and Laser Applications
- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Advanced Combustion Engine Technologies
- Astronomy and Astrophysical Research
- Advanced Chemical Physics Studies
- Gas Dynamics and Kinetic Theory
Yunnan University
2023-2024
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 Atacama Large Millimeter/submillimeter Array Band 6 (1.3 mm) observations of dense cores in three massive molecular clouds within the central zone (CMZ) Milky Way, including Dust Ridge cloud e, Sgr C, and 20 km s −1 cloud, at a spatial resolution 2000 au. Among 834 identified from 1.3 mm continuum, we constrain temperatures linewidths 253 using local thermodynamic equilibrium methods to fit H 2 CO and/or CH 3 CN spectra. determine their masses dust continuum derived...
Abstract The Atacama Large Millimeter/submillimeter Array (ALMA) Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE) aims to investigate the process mass assembly its connection high-mass star formation theories protoclusters a dynamic view. We observed 11 massive ( M clump ≳ 10 3 ⊙ ), luminous L bol 4 blue-profile (infall signature) clumps by ALMA resolution ∼2200–5500 au (median value 3500 au) at 350 GHz (870 μ m). identified 248 dense cores,...
Hot cores represent critical astrophysical environments for high-mass star formation, distinguished by their rich spectra of organic molecular emission lines. Nevertheless, comprehensive statistical analyses extensive hot core samples remain relatively scarce in current astronomical research. We aim to utilize high-angular-resolution line data from the Atacama Large Millimeter and Submillimeter Array (ALMA) identify cores, with a particular focus on weak-emission candidates, provide one...
Abstract Investigating the temperature and density structures of gas in massive protoclusters is crucial for understanding chemical properties therein. In this study, we present observations continuum thioformaldehyde (H 2 CS) lines at 345 GHz 11 using Atacama Large Millimeter/submillimeter Array telescope. High spatial resolution sensitivity have detected 145 cores from sources. H CS line transitions are observed 72 out cores, including line-rich warm cold cores. The column densities...
We report the first detection of radio recombination lines (RRLs) ions heavier than helium. In a highly sensitive multi-band (12–50 GHz) line survey toward Orion KL with TianMa 65-m Radio Telescope (TMRT), we successfully detected more fifteen unblended α RRLs singly ionized species (X II ) recombined from X III . The Ka -band (26–35 spectrum also shows tentative signals β ions. can be crossmatched rest frequencies C and/or O This finding greatly expands scope our understanding ion RRLs,...
Abstract We present Atacama Large Millimeter/submillimeter Array subarcsecond-resolution observations of both continuum and molecular lines at 345 GHz toward the massive star-forming region IRAS 16351-4722 (hereafter I16351). A total 12 dust cores were detected based on high-spatial-resolution continuum. Among them, a high-mass core (11.6 M ⊙ ) low-mass (1.7 show abundant line emissions. 164 transitions from 29 species 104 25 are identified in cores, respectively. Complex organic molecules...
Abstract We conducted a Ka -band (26.1–35 GHz) line survey toward Orion KL using the TianMa 65 m Radio Telescope (TMRT). It is first blind in band and achieves sensitivity at mK level (1–3 spectral resolution of ∼1 km s −1 ). In total, 592 Gaussian features are extracted. Among them, 257 radio recombination lines (RRLs) identified. The maximum Δ n RRLs H, He, C 20, 15, 5, respectively. Through stacking, we have detected β ion (RRLs + with possible contribution other ions like O ) for time,...
ABSTRACT We present high-spatial resolution (0.7–1.0 arcsec) submillimeter observations of continuum and molecular lines CH$_{3}$OCHO, CH$_{3}$OCH$_{3}$, H$_{2}$CCO toward 11 high-mass star-forming regions using the Atacama large millimetre/submillimetre array (ALMA). A total 19 separate cores from nine are found to be line-rich, including high-, intermediate-, low-mass line-rich cores. The three molecules detected in these map emission regions. spatial distribution is very similar...
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 (1.3 mm) observations of dense cores in three massive molecular clouds within the Central Molecular Zone (CMZ) Milky Way, including Dust Ridge cloud e, Sgr C, and 20 km s-1 cloud, at a spatial resolution 2000 au. Among 834 identified from 1.3 mm continuum, we constrain temperatures linewidths 253 using local thermodynamic equilibrium (LTE) methods to fit H2CO and/or CH3CN spectra. determine their masses dust continuum...
We report the first detection of radio recombination lines (RRLs) ions heavier than helium. In a highly sensitive multi-band (12--50 GHz) line survey toward Orion KL with TianMa 65-m Radio Telescope (TMRT), we successfully detected more fifteen unblended $α$ RRLs singly ionized species (XII) recombined from XIII. The Ka-band (35--50 spectrum also shows tentative signals $β$ ions. can be crossmatched rest frequencies CII and/or OII. This finding greatly expands connotation ion RRLs, since...
The ALMA Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE) aims to investigate the process mass assembly its connection high-mass star formation theories protoclusters a dynamic view. We observed 11 massive (Mclump>1000 Msun), luminous (Lbol>10,000 Lsun), blue-profile (infall signature) clumps by resolution 2200-5500 au at 350 GHz (870 um) continuum line emission. 248 dense cores were identified, including 106 showing protostellar signatures 142...
Investigating the temperature and density structures of gas in massive protoclusters is crucial for understanding chemical properties therein. In this study, we present observations continuum thioformaldehyde (H2CS) lines at 345 GHz 11 using Atacama Large Millimeter/submillimeter Array (ALMA) telescope. High spatial resolution sensitivity have detected 145 cores from sources. H2CS line transitions are observed 72 out cores, including line-rich warm cold cores. The H2 column densities...
We present ALMA sub-arcsecond-resolution observations of both continuum and molecular lines at 345 GHz towards the massive star-forming region IRAS 16351-4722 (hereafter I16351). A total 12 dust cores were detected based on high spatial resolution continuum. Among them, a high-mass core (11.6 Msun) low-mass (1.7 show abundant line emissions. 164 transitions from 29 species 104 25 are identified in cores, respectively. Complex organic molecules (COMs) such as CH3OH, CH3OCHO, CH3OCH3, C2H5OH,...