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The Structure of the Radio Recombination Line Maser Emission in the Envelope of MWC349A
James M. Moran, Qizhou Zhang, Deanna L. Emery
The Submillimeter Array (SMA) has been used to image the emission from radio recombination lines of hydrogen at subarcsecond angular resolution from the young high-mass star MWC349…
First Detection of Equatorial Dark Dust Lane in a Protostellar Disk at Submillimeter Wavelength
Chin-Fei Lee, Zhi-Yun Li, Paul. T. P Ho +3
In the earliest (so-called "Class 0") phase of sunlike (low-mass) star formation, circumstellar disks are expected to form, feeding the protostars. However, such disks are difficul…
A Massive Prestellar Clump Hosting no High-Mass Cores
Patricio Sanhueza, James M. Jackson, Qizhou Zhang +5
The Infrared Dark Cloud (IRDC) G028.23-00.19 hosts a massive (1,500 Msun), cold (12 K), and 3.6-70 um IR dark clump (MM1) that has the potential to form high-mass stars. We observe…
The Molecular Gas Environment in the 20 km s Cloud in the Central Molecular Zone
Xing Lu, Qizhou Zhang, Jens Kauffmann +9
We recently reported a population of protostellar candidates in the 20 km s cloud in the Central Molecular Zone of the Milky Way, traced by HO masers in gravitationally…
Magnetic fields in the massive dense cores of DR21 filament: weakly magnetized cores in a strongly magnetized filament
Tao-Chung Ching, Shih-Ping Lai, Qizhou Zhang +3
We present Submillimeter Array 880 m dust polarization observations of six massive dense cores in the DR21 filament. The dust polarization shows complex magnetic field structure…
The ALMA view of W33A: A Spiral Filament Feeding the Candidate Disc in MM1-Main
L. T. Maud, M. G. Hoare, R. Galván-Madrid +4
We targeted the massive star forming region W33A using the Atacama Large Sub/Millimeter Array (ALMA) in band 6 (230 GHz) and 7 (345 GHz) to search for a sub-1000au disc around the…
Simultaneous low- and high-mass star formation in a massive protocluster: ALMA observations of G11.92-0.61
C. J. Cyganowski, C. L. Brogan, T. R. Hunter +4
We present 1.05 mm ALMA observations of the deeply embedded high-mass protocluster G11.92-0.61, designed to search for low-mass cores within the accretion reservoir of the massive…
Mass growth in MYSO fed by companion
Xi Chen, Zhiyuan Ren, Qizhou Zhang +2
We present a Submillimeter Array (SMA) observation towards the young massive double-core system G350.69-0.49. This system consists of a northeast (NE) diffuse gas Bubble and a sout…