The first series of images refers to NGC 1672, a barred spiral. Velocity Field of NGC 1672.
Different colors refer to different velocities as the galaxy is rotating.
Note that the core also shows strong rotation. The following image is an H-alpha intensity map of the spiral galaxy NGC 1292. The Bright Red spots are prominent H II regions and the blue represents more diffuse emission. Virtually every place in the disk of this galaxy emits H-alpha radiation. This next image is an H-alpha intensity map of the spiral galaxy NGC 1406.