Images of a Galaxy Undergoing Ram Pressure Stripping
Joachim Köppen Kiel Feb. 2017
This tool shows a false colour 'image' of the surface density of
the gas in a galaxy, as it would appear to an external observer, when it
is tilted with respect to the plane of the sky.
The parameters are:
Galactic disk:
- outer radius: of the gas disk
- radial scale: the gas surface density follows an exponential law
- central density: gas volume density at the centre of the disk
Gas tail:
- outer radius: the tail is assumed to be a cylinder whose inner radius
is equal to the galaxy's outer radius, and whose outer radius is given here
- length: is the length of the cylinder, downstream from the disk
- wind tilt: the angle of the incoming wind with respect to the normal of the
galactic plane, and hence the tilt of the cylinder
- tail flare: as simulations show that the gas tail does not follow
directly the wind direction, but flares out. This is modelled by
this parameter (about 10..20°)
- sheet flare: the gas sheet which makes the cylinder may also expand
due to the thermal pressure of the gas. This parameter models
such expansion (about 10..25°)
View:
- inclination: is the angle between the galaxy's normal and the line-of-sight
of the observer
- min, max: give the lower and upper limits for the rainbow colour band which
codes the observed surface density
- linear/logarithmic: one may chose the way in which the false colour band
codes the surface density between the two limit values
- Mouse position:
- gives the X and Y coordinates and the surface density (as Z) at the current
position of the mouse
Enter a value in one of the input fields and click the 'Enter' key of your keyboard.
Changes of the parameters of the galaxy or the gas tail require creating a new model,
which takes some seconds. Changes of the display options are faster.