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A circumstellar molecular gas structure associated with the massive young star Cepheus A-HW 2We report the detection via VLA-D observations of ammonia of a circumstellar high-density molecular gas structure toward the massive young star related to the object Cepheus A-HW 2, a firm candidate for the powering source of the high-velocity molecular outflow in the region. We suggest that the circumstellar molecular gas structure could be related to the circumstellar disk previously suggested from infrared, H2O, and OH maser observations. We consider as a plausible scenario that the double radio continuum source of HW 2 could represent the ionized inner part of the circumstellar disk, in the same way as proposed to explain the double radio source in L1551. The observed motions in the circumstellar molecular gas can be produced by bound motions (e.g., infall or rotation) around a central mass of about 10-20 solar masses (B0.5 V star or earlier).
Document ID
19930043851
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Torrelles, Jose M.
(CSIC, Inst. de Astrofisica de Andalucia, Granada, Spain; 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)
Ho, Paul T. P.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
February 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 404
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A27848
Funding Number(s)
CONTRACT_GRANT: NAGW-3121
Distribution Limits
Public
Copyright
Other

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