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Title:
The Formation of Massive Counterrotating Disks in Spiral Galaxies
Authors:
Thakar, Aniruddha R.
Affiliation:
AA(The Ohio State University)
Publication:
American Astronomical Society, 188th AAS Meeting, #83.04; Bulletin of the American Astronomical Society, Vol. 28, p.959
Publication Date:
05/1996
Origin:
AAS
Bibliographic Code:
1996AAS...188.8304T

Abstract

The detection of significant populations of stars and/or gas orbiting in a retrograde manner in several spiral galaxies during the last few years has posed a daunting challenge to galaxy formation theorists, particularly because these galaxies do not show disturbed morphologies, thick disks, or other signatures of unusual kinematics. In an attempt to explain the origin of such counterrotating disks in spiral galaxies, I have developed numerical simulations which incorporate gas dynamics into a tree N-body code. I present the results of these simulations and discuss the origin of massive counterrotating disks by gas infall and spiral-dwarf mergers. I compare the simulation results from two different gas dynamics schemes: sticky particles and smoothed particle hydrodynamics (SPH). I also discuss a case-study of NGC 4138, an Sa(r) galaxy where a counterrotating disk appears to be still forming.
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