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Tracking Protostellar Variability in Massive Protoclusters with ALMA: I. Insights from QUARKS and MaMMOtH
Yuhan Yang, Tie Liu, Sheng-Yuan Liu +22
Millimeter/submillimeter variability is often attributed to dynamical disk-mediated accretion, yet detection is limited to low-mass protostars in nearby clouds. Recent observations…
ALMAGAL VII. Cataloging Hierarchical Mass Structure from Cores to Clumps across the Galactic Disk
Jennifer Wallace, Taevis Kolz, Cara Battersby +42
Investigating the multi-scale fragmentation of dense clumps into compact cores is essential for understanding the processes that govern the initial distribution of mass in stellar…
A Multi-Scale Picture of Magnetic Field and Gravity from Large-Scale Filamentary Envelope to Core-Accreting Dust Lanes in the High-Mass Star-Forming Region W51
Patrick M. Koch, Ya-Wen Tang, Paul T. P. Ho +6
We present 230 GHz continuum polarization observations with the Atacama Large Milimeter/Submillimeter Array (ALMA) at a resolution of 0$\farcs1$ (~au) in the high-mass st…
Exploring the 100 au Scale Structure of the Protobinary System NGC 2264 CMM3 with ALMA
Yoshiki Shibayama, Yoshimasa Watanabe, Yoko Oya +8
We have observed the young protostellar system NGC 2264 CMM3 in the 1.3 mm and 2.0 mm bands at a resolution of about 0.1 (70 au) with ALMA. The structures of two distinct compon…
K-band High-Resolution Spectroscopy of Embedded Massive Protostars
Tien-Hao Hsieh, Michihiro Takami, Michael S. Connelley +7
A classical paradox in high-mass star formation is that powerful radiation pressure can halt accretion, preventing further growth of a central star. Disk accretion has been propose…
ALMA View of the Infalling Envelope around a Massive Protostar in S255IR SMA1
Sheng-Yuan Liu, Yu-Nung Su, Igor Zinchenko +4
The massive young stellar object S255IR NIRS3 embedded in the star forming core SMA1 has been recently observed with a luminosity burst, which is conjectured as a disc-mediated var…
Dense Cores, Filaments and Outflows in the S255IR Region of High Mass Star Formation
Igor I. Zinchenko, Sheng-Yuan Liu, Yu-Nung Su +2
We investigate at a high angular resolution the spatial and kinematic structure of the S255IR high mass star-forming region, which demonstrated recently the first disk-mediated acc…
Implications of a hot atmosphere/corino from ALMA observations towards NGC1333 IRAS 4A1
Dipen Sahu, Sheng-Yuan Liu, Yu-Nung Su +4
We report high angular resolution observations of NGC1333 IRAS4A, a protostellar binary including A1 and A2, at 0.84 mm with the Atacama Large Millimeter/submillimeter Array. From…
A Submillimeter Burst of S255IR~SMA1 - The Rise And Fall Of Its Luminosity
Sheng-Yuan Liu, Yu-Nung Su, Igor Zinchenko +2
Temporal photometric variations at near infrared to submillimeter wavelengths have been found in low-mass young stellar objects. These phenomena are generally interpreted as accret…
Disks and outflows in the S255IR area of high mass star formation from ALMA observations
I. Zinchenko, S. -Y. Liu, Y. -N. Su +1
We describe the general structure of the well known S255IR high mass star forming region, as revealed by our recent ALMA observations. The data indicate a physical relation of the…
Polarization Properties and Magnetic Field Structures in the High-Mass Star-Forming Region W51 Observed with ALMA
Patrick M. Koch, Ya-Wen Tang, Paul T. P. Ho +3
We present the first ALMA dust polarization observations towards the high-mass star-forming regions W51 e2, e8, and W51 North in Band 6 (230 GHz) with a resolution around 0.26" ($\…
Magnetic Fields from Filaments to Cores
Patrick M. Koch, Ya-Wen Tang, Nicholas L. Chapman +7
How important is the magnetic (B-) field when compared to gravity and turbulence in the star-formation process? Does its importance depend on scale and location? We summarize submm…
Multiline observations of S255IR with ALMA
Igor Zinchenko, Sheng-Yuan Liu, Yu-Nung Su +1
We present preliminary results of the high resolution observations of the high mass star forming region S255IR with ALMA in sev…
Discovery of Striking Difference of Molecular-Emission-Line Richness in the Potential Proto-Binary System NGC 2264 CMM3
Yoshimasa Watanabe, Nami Sakai, Ana Lopez-Sepulcre +5
We have conducted an interferometric line survey in the 0.8 mm band toward the young high-mass protostar candidate NGC 2264 CMM3 with ALMA. CMM3 is resolved into the two continuum…
ALMA reveals sequential high-mass star formation in the G9.62+0.19 complex
Tie Liu, John Lacy, Pak Shing Li +15
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 re…
A Hot and Massive Accretion Disk around the High-Mass Protostar IRAS 20126+4104
Huei-Ru Vivien Chen, Eric Keto, Qizhou Zhang +3
We present new spectral line observations of the CH3CN molecule in the accretion disk around the massive protostar IRAS 20126+4104 with the Submillimeter Array that for the first t…
The disk-outflow system in the S255IR area of high mass star formation
I. Zinchenko, S. -Y. Liu, Y. -N. Su +7
We report the results of our observations of the S255IR area with the SMA at 1.3 mm in the very extended configuration and at 0.8 mm in the compact configuration as well as with th…
Spectral Line Survey toward Young Massive Protostar NGC 2264 CMM3 in the 4 mm, 3 mm, and 0.8 mm Bands
Yoshimasa Watanabe, Nami Sakai, Ana Lopez-Sepulcre +6
Spectral line survey observations are conducted toward the high-mass protostar candidate NGC 2264 CMM3 in the 4 mm, 3 mm, and 0.8 mm bands with the Nobeyama 45 m telescope and the…
The Processing of the Clumpy Molecular Gas in the Galactic Center and the Star-Formation
Hauyu Baobab Liu, Paul T. P. Ho, Melvyn C. H. Wright +5
We present the Green Bank 100m Telescope (GBT) mapping observations of CS 1-0, and the Submillimeter Array (SMA) 157-pointings mosaic of the 0.86 mm dust continuum emission as well…
ISM Processing in the Inner 20 pc in Galactic center
Hauyu Baobab Liu, Paul T. -P. Ho, Melvyn C. H. Wright +5
We present the Submillimeter Array (SMA) 157-pointing mosaic in 0.86 mm dust continuum emission with 5.2 angular resolution, and the NRAO Green Bank 100m Telescope (GB…
Milky Way Supermassive Black Hole: Dynamical Feeding from the Circumnuclear Environment
Hauyu Baobab Liu, Pei-Ying Hsieh, Paul T. P. Ho +4
The supermassive black hole (SMBH), Sgr A*, at the Galactic Center is surrounded by a molecular circumnuclear disk (CND) lying between 1.5-4 pc radii. The irregular and clumpy stru…
A Multi-Wavelength High Resolution Study of the S255 Star Forming Region. General structure and kinematics
I. Zinchenko, S. -Y. Liu, Y. -N. Su +4
We present observational data for two main components (S255IR and S255N) of the S255 high mass star forming region in continuum and molecular lines obtained at 1.3 mm and 1.1 mm wi…
Deuterium Fractionation as an Evolutionary Probe in Massive Proto-stellar/cluster Cores
Huei-Ru Chen, Sheng-Yuan Liu, Yu-Nung Su +1
Clouds of high infrared extinction are promising sites of massive star/cluster formation. A large number of cloud cores discovered in recent years allows investigation of possible…
The Hot and Clumpy Molecular Cocoon Surrounding the Ultracompact HII Region G5.89-0.39
Y. -N. Su, S. -Y. Liu, K. -S. Wang +2
We present observations of CH3CN (12-11) emission at a resolution of 2" toward the shell-like ultracompact HII region G5.89-0.39 with the Submillimeter Array. The integrated CH3CN…