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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…
G11.92-0.61 MM1: A Keplerian disc around a massive young proto-O star
J. D. Ilee, C. J. Cyganowski, P. Nazari +4
The formation process of massive stars is not well understood, and advancement in our understanding benefits from high resolution observations and modelling of the gas and dust sur…
Hot ammonia around young O-type stars. III. High-mass star formation and hot core activity in W51~Main
Ciriaco Goddi, Adam Ginsburg, Qizhou Zhang
This paper is the third in a series of ammonia multilevel imaging studies in well-known high-mass star forming regions. Using the JVLA, we have mapped the hot and dense molecular g…
Helical Magnetic Fields in the NGC1333 IRAS 4A Protostellar Outflows
Tao-Chung Ching, Shih-Ping Lai, Qizhou Zhang +3
We present Submillimeter Array (SMA) polarization observations of the CO = 3--2 line toward the NGC1333 IRAS 4A. The CO Stokes maps at an angular resolution of 1$\arc…
Next Generation Very Large Array Memo No. 6, Science Working Group 1: The Cradle of Life
Andrea Isella, Charles L. H. Hull, Arielle Moullet +33
This paper discusses compelling science cases for a future long-baseline interferometer operating at millimeter and centimeter wavelengths, like the proposed Next Generation Vary L…
SMA observations of C2H in High-Mass Star Forming Regions
Xue-Jian Jiang, Hauyu Baobab Liu, Qizhou Zhang +5
CH is a representative hydrocarbon that is abundant and ubiquitous in the interstellar medium (ISM). To study its chemical properties, we present Submillimeter Array (SMA) obse…
Extremely Energetic Outflow and Decelerated Expansion in W49N
Tie Liu, Kee-Tae Kim, Yuefang Wu +10
W49N is a mini-starburst in the Milky Way and thus an ideal laboratory for high-mass star formation studies. Due to its large distance (11.1 kpc), the kinematics 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…
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…
Time Monitoring of Radio Jets and Magnetospheres in the Nearby Young Stellar Cluster R Coronae Australis
Hauyu Baobab Liu, Roberto Galván-Madrid, Jan Forbrich +9
We report JVLA 8-10 GHz (=3.0-3.7 cm) monitoring observations toward the YSO cluster R Coronae Australis (R\,CrA), taken in 2012, from March 15 to September 12. These observatio…
Molecular Jet of IRAS 04166+2706
Liang-Yao Wang, Hsien Shang, Yu-Nung Su +5
The molecular outflow from IRAS 04166+2706 was mapped with the Submillimeter Array (SMA) at 350 GHz continuum and CO J = 32 at an angular resolution of ~1 arcsec. The field of v…
Gas kinematics and the Dragged Magnetic Field in the High-mass Molecular Outflow Source G192.163.84: An SMA View
Hauyu Baobab Liu, Keping Qiu, Qizhou Zhang +2
We report the Submillimeter Array (SMA) observations of the polarized 0.88\,mm thermal dust emission and various molecular line transitions toward the early B-type ($L_{*}\sim2\tim…
SMA Observations of Class 0 Protostars: A High-Angular Resolution Survey of Protostellar Binary Systems
Xuepeng Chen, Hector G. Arce, Qizhou Zhang +8
We present high angular resolution 1.3 mm and 850 um dust continuum data obtained with the Submillimeter Array toward 33 Class 0 protostars in nearby clouds (distance < 500 pc), wh…
AFGL 5157 NH: A new stellar cluster in the forming
Z. Jiang, Z. Chen, Y. Wang +4
We present the analysis of Spitzer/IRAC and NIR imaging observation of AFGL 5157, an active star forming region. In the IRAC images, this region shows strong PAH emissions in chann…
A new radio recombination line maser object toward the MonR2 HII region
I. Jimenez-Serra, A. Baez-Rubio, V. M. Rivilla +4
We report the detection of a new radio recombination line (RRL) maser object toward the IRS2 source in the MonR2 ultracompact HII region. The continuum emission at 1.3mm and 0.85mm…
A Double-Jet System in the G31.41+0.31 Hot Molecular Core
Luca Moscadelli, Jing Jing Li, Riccardo Cesaroni +3
This work presents a detailed study of the gas kinematics towards the "Hot Molecular Core" (HMC) G31.41+0.31 via multi-epoch VLBI observations of the H2O 22 GHz and CH3OH 6.7 GHz m…
Fragmentation and OB Star Formation in High-Mass Molecular Hub-Filament System
Hauyu Baobab Liu, Izaskun Jiménez-Serra, Paul T. -P. Ho +3
Filamentary structures are ubiquitously seen in the interstellar medium. The concentrated molecular mass in the filaments allows fragmentation to occur in a shorter timescale than…
Different Evolutionary Stages in the Massive Star Forming Region W3 Main Complex
Yuan Wang, Henrik Beuther, Qizhou Zhang +4
We observed three high-mass star-forming regions in the W3 high-mass star formation complex with the Submillimeter Array and IRAM 30 m telescope. These regions, i.e. W3 SMS1 (W3 IR…
Chemical segregation toward massive hot cores: The AFGL2591 star forming region
I. Jimenez-Serra, Q. Zhang, S. Viti +2
We present high angular resolution observations (0.5"x0.3") carried out with the Submillimeter Array (SMA) toward the AFGL2591 high-mass star forming region. Our SMA images reveal…
SMA and Spitzer Observations of Bok Glouble CB17: A Candidate First Hydrostatic Core?
Xuepeng Chen, Hector G. Arce, Michael M. Dunham +5
We present high angular resolution SMA and Spitzer observations toward the Bok globule CB17. SMA 1.3mm dust continuum images reveal within CB17 two sources with an angular separati…
Discovery of A Binary System in IRAM 04191+1522
Xuepeng Chen, Hector G. Arce, Michael M. Dunham +1
We present high angular resolution observations of the Class 0 protostar IRAM04191+1522, using the Submillimeter Array (SMA). The SMA 1.3 mm continuum images reveal within IRAM0419…