Two-dimensional Kinematics of a Bar and Central Disk in NGC5448

Details Two-dimensional Kinematics of a Bar and Central Disk in NGC5448 Two-dimensional Kinematics of a Bar and Central Disk in NGC5448

2005-08-04

arxiv.org/abs/astro-ph/0508131v1

Astronomy and Astrophysics

Astrophysics

To appear in the conference proceedings for the Island Universes conference (July 8-11, 2005). Please find the high resolution

Scientific paper

We analyse SAURON kinematic maps of the inner kpc of the early-type (Sa) barred spiral galaxy NGC 5448. The observed morphology and kinematics of the emission-line gas is patchy and perturbed, indicating clear departures from circular motion. The kinematics of the stars is more regular, and displays a small inner disk-like system embedded in a large-scale rotating structure. We focus on the [OIII] gas, and use a harmonic decomposition formalism to analyse the gas velocity field. The higher-order harmonic terms and the main kinematic features of the observed data are consistent with an analytically constructed simple bar model, which is derived using linear theory. Our study illustrates how the harmonic decomposition formalism can be used as a powerful tool to quantify non-circular motions in observed gas velocity fields.

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