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CO Structure of the 21 μm Source IRAS 22272+5435: A Sign of a Jet Launch?

Nakashima, Jun-Ichi and Koning, Nico and Volgenau, Nikolaus H. and Kwok, Sun and Yung, Bosco H. K. and Zhang, Yong (2012) CO Structure of the 21 μm Source IRAS 22272+5435: A Sign of a Jet Launch? Astrophysical Journal, 759 (1). Art. No. 61. ISSN 0004-637X. doi:10.1088/0004-637X/759/1/61.

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We report the results of radio interferometric observations of the 21 μm source IRAS 22272+5435 in the CO J = 2-1 line. 21 μm sources are carbon-rich objects in the post-asymptotic-giant-branch phase of evolution, which show an unidentified emission feature at 21 μm. Since 21 μm sources usually also have circumstellar molecular envelopes, the mapping of CO emission from the envelope will be useful in tracing the nebular structure. From observations made with the Combined Array for Research in Millimeter-wave Astronomy, we find that a torus and spherical wind model can explain only part of the CO structure. An additional axisymmetric region created by the interaction between an invisible jet and ambient material is suggested.

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Additional Information:© 2012 American Astronomical Society. Received 2012 July 19; accepted 2012 September 18; published 2012 October 17. This work is supported by a grant awarded to J.N. and S.N. from the Research Grants Council of Hong Kong (project code: HKU 704710P; HKU 703110P) and the Small Project Funding of the University of Hong Kong (project code: 201007176004). Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, and by the CARMA partner universities. The authors thank Hiroshi Imai for stimulating discussions and valuable comments.
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU 704710P
Research Grants Council of Hong KongHKU 703110P
University of Hong Kong Small Project Funding201007176004
Gordon and Betty Moore FoundationUNSPECIFIED
Kenneth T. and Eileen L. Norris FoundationUNSPECIFIED
James S. McDonnell FoundationUNSPECIFIED
Caltech AssociatesUNSPECIFIED
University of ChicagoUNSPECIFIED
CARMA partner universitiesUNSPECIFIED
States of California, Illinois, and MarylandUNSPECIFIED
Subject Keywords:circumstellar matter; ISM: jets and outflows; stars: AGB and post-AGB; stars: imaging; stars: individual (IRAS 22272+5435); stars: mass-loss
Issue or Number:1
Record Number:CaltechAUTHORS:20121218-073813213
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Official Citation:CO Structure of the 21 μm Source IRAS 22272+5435: A Sign of a Jet Launch? Jun-ichi Nakashima, Nico Koning, Nikolaus H. Volgenau, Sun Kwok, Bosco H. K. Yung, and Yong Zhang doi:10.1088/0004-637X/759/1/61
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36018
Deposited By: Ruth Sustaita
Deposited On:18 Dec 2012 16:05
Last Modified:09 Nov 2021 23:19

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