On the Spiral Structure of NGC 5248: An Analytic Approach
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4361462
- author
- Yuan, Chi and Yang, Chao-Chin LU
- publishing date
- 2006
- 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
- American Astronomical Society
- 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
- 2016-04-04 12:18:45
- date last changed
- 2022-01-29 23:14:14
@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}},
keywords = {{Galaxies: Individual: NGC Number: NGC 5248 Galaxies: Kinematics and Dynamics Galaxies: Spiral Galaxies: Structure}},
language = {{eng}},
number = {{1}},
pages = {{180--187}},
publisher = {{American Astronomical Society}},
series = {{The Astrophysical Journal}},
title = {{On the Spiral Structure of NGC 5248: An Analytic Approach}},
url = {{http://dx.doi.org/10.1086/503519}},
doi = {{10.1086/503519}},
volume = {{644}},
year = {{2006}},
}