From bipolar to quadrupolar - The collimation processes of the Cepheus A outflow

Astronomy and Astrophysics – Astrophysics

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Ammonia, Interstellar Gas, Molecular Clouds, Molecular Flow, Interstellar Matter, Red Shift, Spectral Emission, Stellar Activity, Stellar Envelopes, Very Large Array (Vla)

Scientific paper

Results of new K-band observations of the (1, 1) and (2, 2) ammonia lines toward Cepheus A are reported. The lines are mapped with approximately 2 arcsec of angular resolution and 0.3 km/s of velocity resolution. A sensitivity of 10 mJy has been achieved. The observations reveal details of the spatial and kinematics structure of the ambient high-density gas. It is suggested that the interstellar high-density gas is diverting and redirecting the outflow in the sense that the quadrupolar structure of the molecular outflow is produced by the interaction with the ammonia condensationss, with Cep A-1 and Cep A-3 splitting in two halves, respectively the blue- and redshifted lobes of an east-west bipolar molecular outflow.

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