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On the Spiral Structure of NGC 5248: An Analytic Approach

Yuan, Chi and Yang, Chao-Chin LU (2006) In The Astrophysical Journal 644(1). p.180-187
Abstract
An improved nonlinear asymptotic theory of spiral density waves is developed. It extends the theory developed by Yuan & Kuo to a global theory, not just one limited to the vicinity of the resonance. It can then be applied to the recent high-resolution observations of CO and HST NICMOS of nearby spiral galaxies. As an example, we apply the theory to the nearby grand-design spiral galaxy NGC 5248, which has excellent CO observations in the central regions and exhibits a continuous optical spiral pattern from about 7 kpc to about 100 pc. Using the improved nonlinear asymptotic theory, we confirm the earlier results that the inner two-arm spiral structure of NGC 5248 is driven by a slowly rotating bar potential at the outer inner Lindblad... (More)
An improved nonlinear asymptotic theory of spiral density waves is developed. It extends the theory developed by Yuan & Kuo to a global theory, not just one limited to the vicinity of the resonance. It can then be applied to the recent high-resolution observations of CO and HST NICMOS of nearby spiral galaxies. As an example, we apply the theory to the nearby grand-design spiral galaxy NGC 5248, which has excellent CO observations in the central regions and exhibits a continuous optical spiral pattern from about 7 kpc to about 100 pc. Using the improved nonlinear asymptotic theory, we confirm the earlier results that the inner two-arm spiral structure of NGC 5248 is driven by a slowly rotating bar potential at the outer inner Lindblad resonance and is a continuation of the outer optical spiral arms. Using the new theory, we calculate the streamlines, surface density, and line-of-sight velocity contours of the bar-driven flow in the central gas disk, and these results are in good agreement with the observations. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Galaxies: Individual: NGC Number: NGC 5248 Galaxies: Kinematics and Dynamics Galaxies: Spiral Galaxies: Structure
in
The Astrophysical Journal
volume
644
issue
1
pages
180 - 187
publisher
University of Chicago Press
external identifiers
  • Scopus:33747034717
DOI
10.1086/503519
language
English
LU publication?
no
id
4f112680-8f26-4535-9769-4139fb4eba1f (old id 4361462)
date added to LUP
2014-03-20 16:52:28
date last changed
2017-01-01 08:08:06
@article{4f112680-8f26-4535-9769-4139fb4eba1f,
  abstract     = {An improved nonlinear asymptotic theory of spiral density waves is developed. It extends the theory developed by Yuan & Kuo to a global theory, not just one limited to the vicinity of the resonance. It can then be applied to the recent high-resolution observations of CO and HST NICMOS of nearby spiral galaxies. As an example, we apply the theory to the nearby grand-design spiral galaxy NGC 5248, which has excellent CO observations in the central regions and exhibits a continuous optical spiral pattern from about 7 kpc to about 100 pc. Using the improved nonlinear asymptotic theory, we confirm the earlier results that the inner two-arm spiral structure of NGC 5248 is driven by a slowly rotating bar potential at the outer inner Lindblad resonance and is a continuation of the outer optical spiral arms. Using the new theory, we calculate the streamlines, surface density, and line-of-sight velocity contours of the bar-driven flow in the central gas disk, and these results are in good agreement with the observations.},
  author       = {Yuan, Chi and Yang, Chao-Chin},
  keyword      = {Galaxies: Individual: NGC Number: NGC 5248 Galaxies: Kinematics and Dynamics Galaxies: Spiral Galaxies: Structure},
  language     = {eng},
  number       = {1},
  pages        = {180--187},
  publisher    = {University of Chicago Press},
  series       = {The Astrophysical Journal},
  title        = {On the Spiral Structure of NGC 5248: An Analytic Approach},
  url          = {http://dx.doi.org/10.1086/503519},
  volume       = {644},
  year         = {2006},
}