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On the Spiral Structure of NGC 5248: An Analytic Approach

In English

Författare

  • Chi Yuan
  • Chao-Chin Yang

Summary, in English

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.

Publiceringsår

2006

Språk

Engelska

Sidor

180-187

Publikation/Tidskrift/Serie

The Astrophysical Journal

Volym

644

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

American Astronomical Society

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • Galaxies: Individual: NGC Number: NGC 5248 Galaxies: Kinematics and Dynamics Galaxies: Spiral Galaxies: Structure

Status

Published