All Figures

Figure 1: In the left panel a) the velocity field contours in the bar region, projected onto the plane of the sky, using i = 45 and major axis of the galaxy at 57 northwest (values from WSW01). Superposed are the isovelocity contours of the projected velocity field as derived in this work, with levels corresponding to intervals of 30 km s-1. In the right panel b) density distribution from WSW01, superposed are the isodensity contours from the particle distribution of the SPH for the mass distribution of NGC 4123 derived from the I-band after 4 bar rotations. The non-axisymmteric component is fully grown after three bar rotations and the bar pattern speed is rotating clockwise in the inertial frame. Notice the agreement in the regions of high density within the bar region.

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In the text

Figure 2: Two cuts across the high velocity gradient region for the deprojected velocity maps of both models. The top panels show the projected velocity. The position corresponds to the velocity going from the leading side towards the trailing side of the shock region in a 30 pixel range (23.4 arcsec), with a cut at a distance along the shock of 30 pixels from the centre ( left panel) and a distance of 35 pixels from the centre ( right panel). The middle panels correspond to the residuals of both line-of-sight velocity distributions. The bottom panels shows the position of the cuts (two parallel black lines) shown in the above panels perpendicular to the shock region on top of the general gas distribution.

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In the text