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From bipolar to quadrupolar - The collimation processes of the Cepheus A outflowResults 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.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Torrelles, Jose M. (Andalucia, Inst. de Astrofisica, Granada, Spain; Harvard-Smithsonian Center for Astrophysics, Cambridge MA, United States)
Verdes-Montenegro, Lourdes (Andalucia Inst. de Astrofisica, Granada, Spain)
Ho, Paul T. P. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Rodriguez, Luis F. (NASA Headquarters Washington, DC United States)
Canto, Jorge (Univ. Nacional Autonoma de Mexico Coyoacan, United States)
Date Acquired
August 16, 2013
Publication Date
June 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 410
Issue: 1
ISSN: 0004-637X
Subject Category
Funding Number(s)
Distribution Limits