Simulated 2D intensity and velocity field of a galaxy. The fields are projected according to the inclination and position angle (here i = 40° and θ = 30°). The direction of dispersion is along the y-axis. The exponential intensity profile is depicted in blue colour scale (here the scale length is rd = 5.3 pix). Isophotes corresponding to 50%, 30%, and 15% of the central intensity are superimposed (black dotted ellipses). The coloured curves (spider-diagram) indicate iso-velocity lines ranging from − 60%Vmax(red) to 60%Vmax(blue) in steps of 10%. Right panel: the intensity and velocity field is additionally convolved with a Gaussian point spread function ( pix). The slit (in black) is placed along the apparent major axis of the galaxy. At each spatial position along the x-axis, an intensity-weighted average of the velocity values inside the slit is calculated. The shaded magenta area indicates this velocity range for a certain spatial position (with boxcar smoothing of 3 pixels). Here, the kinematic and the luminous centres coincide.
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