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The warped disk of Centaurus A in the near-infraredWe present infrared images of Cen A (NGC 5128) in the J, H, and K bands. The infrared morphology is primarily determined by the presence of a thin absorptive warped disk. By integrating the light of the underlying prolate galaxy through such a disk, we construct models which we compare with infrared and X-ray data. The geometry of the warped disk needed to fit the IR data is consistent with a warped disk which has evolved as a result of differential precession in a prolate potential. The disk has an inclination, with respect to the principal axis of the underlying elliptical galaxy, that is higher at larger radii than in the inner region. A scenario is proposed where a small gas-rich galaxy infalling under the force of dynamical friction is tidally stripped. Stripping occurs at different times during its infall. The orientation of the resulting gas disk depends upon the angular momentum of the infalling galaxy. We find that the resulting precession angle of the disk is well described by the precession model, but that the inclination angle may vary as a function of radius. We propose an orbit for the infalling galaxy that is consistent with the geometry of the warped disk needed to fit our infrared data, and rotation observed in the outer part of the galaxy.
Document ID
19930066688
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Quillen, A. C. (California Inst. of Technology Pasadena, United States)
Graham, James R. (California Univ. Berkeley, United States)
Frogel, Jay A. (Ohio State Univ. Columbus, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 412
Issue: 2
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-2144
CONTRACT_GRANT: NSF AST-AST-90-15755
CONTRACT_GRANT: NAGW-2142
Distribution Limits
Public
Copyright
Other