Xiaofeng Mai
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View article: Ferric sulfate-modified biochar as a dual-function amendment for methane mitigation and heavy metal risk control in flooded rice systems
Ferric sulfate-modified biochar as a dual-function amendment for methane mitigation and heavy metal risk control in flooded rice systems Open
View article: A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core
A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core Open
High-mass stars, born in massive dense cores (MDCs), profoundly affect the cosmic ecosystem through feedback processes and metal enrichment, yet little is known about how MDCs assemble and transfer mass across scales to form high-mass youn…
View article: The ALMA-QUARKS Survey. III. Clump-to-core Fragmentation and Searches for High-mass Starless Cores
The ALMA-QUARKS Survey. III. Clump-to-core Fragmentation and Searches for High-mass Starless Cores Open
The Querying Underlying mechanisms of massive star formation with ALMA-Resolved gas Kinematics and Structures (QUARKS) survey observed 139 infrared-bright (IR-bright) massive protoclusters at 1.3 mm wavelength with the Atacama Large Millim…
View article: Validating the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
Validating the bright Gaia celestial reference frame with new VLBI astrometry of radio stars Open
Aims . There exist inconsistencies between the bright and faint Gaia Celestial Reference Frame 3 (Gaia-CRF3), which manifests as a systematic rotation and needs to be independently estimated then corrected in future data releases. Methods …
View article: Serial MultiView: An Efficient Approach to Mitigating Atmospheric Spatial-structure Errors for Very-long-baseline-interferometry Astrometry
Serial MultiView: An Efficient Approach to Mitigating Atmospheric Spatial-structure Errors for Very-long-baseline-interferometry Astrometry Open
Atmospheric propagation errors are a main constraint on the accuracy of very-long-baseline-interferometry astrometry. For relative astrometry, differential techniques can mitigate these errors, but their effectiveness diminishes with decre…
View article: FAST HI data of G165 VHVC
FAST HI data of G165 VHVC Open
SourceData_ED_Fig2.fits: The FAST HI cube of G165 VHVC smoothed to a velocity resolution of ~1 km/s. SourceData_Fig1.fits: Mom 0 map of the HI of G165 VHVC. SourceData_ED_Fig7.fits: Mom 0 map of a simulation that fits G165 VHVC.
View article: The ALMA-ATOMS survey: A sample of weak hot core candidates identified through line stacking
The ALMA-ATOMS survey: A sample of weak hot core candidates identified through line stacking Open
Context . 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 of extensive hot core…
View article: The Orbital Period of the Long-period and Colliding-wind Binary WR 146 from Radio Interferometry of the Shock Cone
The Orbital Period of the Long-period and Colliding-wind Binary WR 146 from Radio Interferometry of the Shock Cone Open
We report the first measurement of the orbital period of a long-period colliding-wind-binary system Wolf–Rayet (WR) 146, derived by tracing the rotational morphology of its wind-colliding region (WCR) and the relative orientation of the tw…
View article: Subclustering and Star Formation Efficiency in Three Protoclusters in the Central Molecular Zone
Subclustering and Star Formation Efficiency in Three Protoclusters in the Central Molecular Zone Open
We present the highest-resolution (∼0 04) Atacama Large Millimeter/submillimeter Array 1.3 mm continuum observations so far of three massive star-forming clumps in the Central Molecular Zone (CMZ), namely 20 km s −1 C1, 20 km s −1 C4…
View article: Subclustering and Star Formation Efficiency in Three Protoclusters in the Central Molecular Zone
Subclustering and Star Formation Efficiency in Three Protoclusters in the Central Molecular Zone Open
We present so far the highest resolution ($\sim$0.04") ALMA 1.3 mm continuum observations of three massive star-forming clumps in the Central Molecular Zone, namely 20 km s$^{-1}$ C1, 20 km $^{-1}$ C4, and Sgr C C4, which reveal prevalent …
View article: The orbital period of the long-period and colliding-wind binary WR 146 from radio interferometry of the shock cone
The orbital period of the long-period and colliding-wind binary WR 146 from radio interferometry of the shock cone Open
We report the first measurement of the orbital period of a long-period colliding-wind binary (CWB) system WR 146, derived by tracing the rotational morphology of its wind-colliding region (WCR) and the relative orientation of the two binar…
View article: ALMA Observations of Massive Clouds in the Central Molecular Zone: External-pressure-confined Dense Cores and Salpeter-like Core Mass Functions
ALMA Observations of Massive Clouds in the Central Molecular Zone: External-pressure-confined Dense Cores and Salpeter-like Core Mass Functions Open
We present Atacama Large Millimeter/submillimeter Array Band 6 (1.3 mm) observations of dense cores in three massive molecular clouds within the central molecular zone (CMZ) of the Milky Way, including the Dust Ridge cloud e, Sgr C, and th…
View article: Core mass function in view of fractal and turbulent filaments and fibers
Core mass function in view of fractal and turbulent filaments and fibers Open
We propose that the core mass function (CMF) can be driven by filament fragmentation. To model a star-forming system of filaments and fibers, we develop a fractal and turbulent tree with a fractal dimension of 2 and a Larson's law exponent…
View article: Serial MultiView: an efficient approach to mitigating atmospheric spatial-structure errors for VLBI astrometry
Serial MultiView: an efficient approach to mitigating atmospheric spatial-structure errors for VLBI astrometry Open
Atmospheric propagation errors are a main constraint on the accuracy of Very Long Baseline Interferometry (VLBI) astrometry. For relative astrometry, differential techniques can mitigate these errors, but their effectiveness diminishes wit…
View article: A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core
A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core Open
High-mass stars, born in massive dense cores (MDCs), play a major role in the cosmic ecosystem. Yet, little is known about how MDCs assemble their mass beyond ∼0.1 pc and transport their mass into smaller and denser seeds of stellar embryo…
View article: ALMA Observations of Massive Clouds in the Central Molecular Zone: External-Pressure-Confined Dense Cores and Salpeter-like Core Mass Functions
ALMA Observations of Massive Clouds in the Central Molecular Zone: External-Pressure-Confined Dense Cores and Salpeter-like Core Mass Functions Open
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) of the Milky Way, including the Dust Ridge cloud e, Sgr C,…
View article: The ALMA-QUARKS Survey: Fibers’ Role in Star Formation Unveiled in an Intermediate-mass Protocluster Region of the Vela D Cloud
The ALMA-QUARKS Survey: Fibers’ Role in Star Formation Unveiled in an Intermediate-mass Protocluster Region of the Vela D Cloud Open
In this paper, we present a detailed analysis of the IRS 17 filament within the intermediate-mass protocluster IRAS 08448-4343 (of ∼10 3 L ⊙ ), using ALMA data from the ATOMS 3 mm and QUARKS 1.3 mm surveys. The IRS 17 filament, which spans…
View article: A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz
A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz Open
Extending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific potentials and benefits. However, it was considered quite cha…
View article: The ALMA-QUARKS Survey: Fibers' role in star formation unveiled in an intermediate-mass protocluster region of the Vela D cloud
The ALMA-QUARKS Survey: Fibers' role in star formation unveiled in an intermediate-mass protocluster region of the Vela D cloud Open
In this paper, we present a detailed analysis of the IRS 17 filament within the intermediate-mass protocluster IRAS 08448-4343 (of $\sim\,10^3\,\rm L_{\odot}$), using ALMA data from the ATOMS 3-mm and QUARKS 1.3-mm surveys. The IRS 17 fila…
View article: A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz
A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz Open
Extending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific potentials and benefits. However, it was considered quite cha…
View article: A pilot study of Galactic radio recombination lines using FAST: Identification of diffuse ionized gas clumps and off-arm star-forming regions
A pilot study of Galactic radio recombination lines using FAST: Identification of diffuse ionized gas clumps and off-arm star-forming regions Open
Observing low-frequency decimeter hydrogen radio recombination lines (RRLs) with large single-dish telescopes, such as the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in the L band, is a unique method for probing massive s…
View article: The ALMA-QUARKS Survey. II. The ACA 1.3 mm Continuum Source Catalog and the Assembly of Dense Gas in Massive Star-Forming Clumps
The ALMA-QUARKS Survey. II. The ACA 1.3 mm Continuum Source Catalog and the Assembly of Dense Gas in Massive Star-Forming Clumps Open
Leveraging the high resolution, sensitivity, and wide frequency coverage of the Atacama Large Millimeter/submillimeter Array (ALMA), the QUARKS survey, standing for “Querying Underlying mechanisms of massive star formation with ALMA-Resolv…
View article: VLBI astrometry of radio stars to link radio and optical celestial reference frames: observing strategies
VLBI astrometry of radio stars to link radio and optical celestial reference frames: observing strategies Open
The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrome…
View article: The Magnetic Field in the Colliding Filaments G202.3+2.5
The Magnetic Field in the Colliding Filaments G202.3+2.5 Open
We observe the magnetic field morphology toward a nearby star-forming filamentary cloud, G202.3+2.5, using James Clerk Maxwell Telescope/POL-2 850 μ m thermal dust polarization observations with an angular resolution of 14.″4 (∼0.053 pc). …
View article: Magnetic Fields in the Central Molecular Zone Influenced by Feedback and Weakly Correlated with Star Formation
Magnetic Fields in the Central Molecular Zone Influenced by Feedback and Weakly Correlated with Star Formation Open
Magnetic fields of molecular clouds in the central molecular zone (CMZ) have been relatively under-observed at sub-parsec resolution. Here, we report JCMT/POL2 observations of polarized dust emission in the CMZ, which reveal magnetic field…
View article: Maser Investigation toward Off-Plane Stars (MIOPS): Detection of SiO Masers in the Galactic Thick Disk and Halo
Maser Investigation toward Off-Plane Stars (MIOPS): Detection of SiO Masers in the Galactic Thick Disk and Halo Open
Studying stars that are located off the Galactic plane is important for understanding the formation history of the Milky Way. We searched for SiO masers toward off-plane O-rich asymptotic giant branch (AGB) stars from the catalog presented…
View article: The ALMA-QUARKS Survey: Detection of Two Extremely Dense Substructures in a Massive Prestellar Core
The ALMA-QUARKS Survey: Detection of Two Extremely Dense Substructures in a Massive Prestellar Core Open
Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the Atacama Large Milli…
View article: The magnetic field in colliding filaments G202.3+2.5
The magnetic field in colliding filaments G202.3+2.5 Open
We observe the magnetic field morphology towards a nearby star-forming filamentary cloud, G202.3+2.5, by the JCMT/POL-2 850 μm thermal dust polarization observation with an angular resolution of 14.4" (~0.053 pc). The average magnetic fiel…
View article: The ALMA-QUARKS survey: Detection of two extremely dense substructures in a massive prestellar core
The ALMA-QUARKS survey: Detection of two extremely dense substructures in a massive prestellar core Open
Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the ALMA-ATOMS survey a…
View article: The ALMA Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE): Core Growth, Cluster Contraction, and Primordial Mass Segregation
The ALMA Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE): Core Growth, Cluster Contraction, and Primordial Mass Segregation Open
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 of mass assembly and its connection to high-mass star for…