博碩士論文 88229010 詳細資訊




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姓名 周美吟( Mei-Yin Chou)  查詢紙本館藏   畢業系所 天文研究所
論文名稱 在剛體自轉氣體盤中的螺旋密度波
(Spiral Density Waves in a Gas Disk of Rigid-body Rotation)
相關論文
★ 三維盤狀星系之結構與穩定
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摘要(英) nearby spiral galaxies can be approximated by a rigid-body rotation.
The density-wave theory of galactic spirals is tailored to handling a
differentially rotating system.
Whether it can survive in a system of rigid-body rotation and, if it can,
how it works in that system deserves a simple answer.
We find indeed it does. Actually, in the linear theory, the waves are
governed by the Bessel equations if the ambient density is constant.
The pitch angle of the spirals increases to reach $90^{circ}$ while the
spirals approaching to the center. These waves are very relevant to the study
of the spiral-bar structures in the gas-dust disk found in the galactic
central regions. We present a linear and a non-linear theory of the spiral
density waves near the center without a driving bar potential.
When it is without the presence of the bar, we believe the waves are caused
by an acoustic-curvature instability (Montenegro, Yuan & Elmergreen 1998).
We compare our results with the HST observations of NGC 2207 and its image
obtained by using the wavelet method.
關鍵字(中) ★ 星系
★ 流體動力學
關鍵字(英) ★ galaxies
★ hydrodynamics
論文目次 1.Introduction
2.Linear Theory for Rigid-body Rotation
3.Numerical Simulation
4.Discussion and Conclusion
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指導教授 鄒志剛(Chih-Kang Chou) 審核日期 2001-7-19
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