SIMBAD references

2016MNRAS.456.2681Q - Mon. Not. R. Astron. Soc., 456, 2681-2691 (2016/March-1)

SMA observations of the W3(OH) complex: Dynamical differentiation between W3(H2O) and W3(OH).

QIN S.-L., SCHILKE P., WU J., LIU T., WU Y., SANCHEZ-MONGE A. and LIU Y.

Abstract (from CDS):

We present Submillimeter Array observations of the HCN (3-2) and HCO+ (3-2) molecular lines towards the W3(H2O) and W3(OH) star-forming complexes. Infall and outflow motions in the W3(H2O) have been characterized by observing HCN and HCO+ transitions. High-velocity blue/red-shifted emission, tracing the outflow, show multiple knots, which might originate in episodic and precessing outflows. `Blue-peaked' line profiles indicate that gas is infalling on to the W3(H2O) dust core. The measured large mass accretion rate, 2.3x10–3 M/yr, together with the small free-fall time-scale, 5x103 yr, suggest W3(H2O) is in an early evolutionary stage of the process of formation of high-mass stars. For the W3(OH), a two-layer model fit to the HCN and HCO+ spectral lines and Spizter/Infrared Array Camera (IRAC) images support that the W3(OH) HII region is expanding and interacting with the ambient gas, with the shocked neutral gas being expanding with an expansion time-scale of 6.4x103 yr. The observations suggest different kinematical time-scales and dynamical states for the W3(H2O) and W3(OH).

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: formation - ISM: individual objects: W3(H2O) - ISM: individual objects: W3(OH) - ISM: kinematics and dynamics

Simbad objects: 5

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2019.12.11-23:40:49

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