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The Importance of the Magnetic Field from an SMA-CSO-Combined Sample of Star-Forming Regions
Patrick M. Koch, Ya-Wen Tang, Paul T. P. Ho +14
Submillimeter dust polarization measurements of a sample of 50 star-forming regions, observed with the SMA and the CSO covering pc-scale clouds to mpc-scale cores, are analyzed in…
Hot Ammonia around Young O-type Stars. II. JVLA imaging of highly-excited metastable ammonia masers in W51-North
Ciriaco Goddi, Christian Henkel, Qizhou Zhang +2
We have used the JVLA at the 1 cm band to map five highly-excited metastable inversion transitions of ammonia, (J,K)=(6,6), (7,7), (9,9), (10,10), and (13,13), in W51 IRS2 with ~0.…
Follow-up observations toward Planck cold clumps with ground-based radio telescopes
Tie Liu, Yuefang Wu, Diego Mardones +26
The physical and chemical properties of prestellar cores, especially massive ones, are still far from being well understood due to the lack of a large sample. The low dust temperat…
Hot Ammonia around O-type Young Stars. I. JVLA imaging of Ammonia (6,6) to (14,14) in NGC7538 IRS1
Ciriaco Goddi, Qizhou Zhang, Luca Moscadelli
To constrain theoretical models of high-mass star formation, observational signatures of mass accretion in O-type forming stars are desirable. Using the JVLA, we have mapped the ho…
Submillimeter Array Observations of Magnetic Fields in G240.31+0.07: an Hourglass in a Massive Cluster-forming Core
Keping Qiu, Qizhou Zhang, Karl M. Menten +3
We report the first detection of an hourglass magnetic field aligned with a well-defined outflow-rotation system in a high-mass star-forming region. The observations were performed…
Magnetic Fields and Massive Star Formation
Qizhou Zhang, Keping Qiu, Josep M. Girart +17
Massive stars ( \msun) typically form in parsec-scale molecular clumps that collapse and fragment, leading to the birth of a cluster of stellar objects. We investigate the r…
VLA observations of ammonia in high-mass star formation regions
Xing Lu, Qizhou Zhang, Hauyu Baobab Liu +2
We report systematic mapping observations of the NH (1,1) and (2,2) inversion lines towards 62 high-mass star-forming regions using VLA in its D and DnC array configurations.…
Shaping a high-mass star-forming cluster through stellar feedback. The case of the NGC 7538 IRS 1-3 complex
Pau Frau, Josep M Girart, Qizhou Zhang +1
Context: NGC 7538 IRS 1-3 is a high-mass star-forming cluster with several detected dust cores, infrared sources, (ultra)compact H regions, molecular outflows, and maser…
Core and filament formation in magnetized, self-gravitating isothermal layers
Sven Van Loo, Eric Keto, Qizhou Zhang
We examine the role of the gravitational instability in an isothermal, self-gravitating layer threaded by magnetic fields on the formation of filaments and dense cores. Using numer…
ALMA Results of the Pseudodisk, Rotating disk, and Jet in Continuum and HCO+ in the Protostellar System HH 212
Chin-Fei Lee, Naomi Hirano, Qizhou Zhang +3
HH 212 is a nearby (400 pc) Class 0 protostellar system showing several components that can be compared with theoretical models of core collapse. We have mapped it in 350 GHz conti…
A sub-arcsecond study of the hot molecular core in G023.01-00.41
A. Sanna, R. Cesaroni, L. Moscadelli +5
(Abridged) METHODS: We performed SMA observations at 1.3 mm with both the most extended and compact array configurations, providing sub-arcsecond and high sensitivity maps of vario…
Hierarchical fragmentation and differential star formation in the Galactic "Snake": infrared dark cloud G11.11-0.12
Ke Wang, Qizhou Zhang, Leonardo Testi +8
We present Submillimeter Array (SMA) 0.88 and 1.3 mm broad band observations, and the Jansky Very Large Array (VLA) observations in up to ,…
Fragmentation of massive dense cores down to ~1000 AU: Relation between fragmentation and density structure
Aina Palau, R. Estalella, J. M. Girart +10
In order to shed light on the main physical processes controlling fragmentation of massive dense cores, we present a uniform study of the density structure of 19 massive dense core…
Star Cluster Formation and Feedback
Mark R. Krumholz, Matthew R. Bate, Hector G. Arce +6
Stars do not generally form in isolation. Instead, they form in clusters, and in these clustered environments newborn stars can have profound effects on one another and on their pa…