Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-23
Astronomy and Astrophysics
Astrophysics
35 pages, 14 figures
Scientific paper
10.1086/590247
NGC 6782 is an early-type barred spiral galaxy exhibiting a rich and complex morphology with multiple ring patterns. To provide a physical understanding of its structure and kinematical properties, two-dimensional hydrodynamical simulations have been carried out. Numerical calculations reveal that the striking features in NGC 6782 can be reproduced provided that the gas flow is governed by the gravitational potential associated with a slowly rotating strong bar. In particular, the response of the gaseous disk to the bar potential leads to the excitation of spiral density waves at the inner Lindblad resonance giving rise to the appearance of a nearly circular nuclear ring with a pair of dust lanes. For a sufficiently strong bar potential, the inner 4:1 spiral density waves are also excited. The interaction of the higher harmonic waves with the waves excited at the inner Lindblad resonance and confined by the outer Lindblad resonance results in the observed diamond-shaped (or pointy oval) inner ring structure. The overall gas morphology and kinematical features are both well reproduced by the model provided that the pattern speed of the bar is $\sim 25$ km s$^{-1}$ kpc$^{-1}$.
Buta Ron
Lin Lien-Hsuan
Yuan Chi
No associations
LandOfFree
Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 6782 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 6782, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 6782 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-500439