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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…