Below are some 3D examples of several prominent galaxies from the GASP sample currently undergoing extreme Ram-Pressure Stripping. The models shown are produced by combining the spatial and velocity distributions of the prominent nebular emission lines as well as the stellar component. The model of JW100 is produced by combining the 2-component fits of the prominent nebular emission lines in order to better trace the complex kinematics within the centre of the galaxy and around the edges of the disk, where line-of-sight stripping produces large offsets in the velocities of the stripped gas and tails along the line of sight.
The x- and y-axes show the two spatial dimensions of the galaxy as it is observed on the sky, and the z-axis describes the velocity structure of the gas along the line of sight.
Interesting features include the offset between the white (stellar) and red (Hydrogen alpha) components, showing the Ram-Pressure affecting the gas without disturbing the stellar component. We can see from the models that there is a large quantity of stripped gas which is ionised by star formation and in some cases, outflowing gas in the centre that is related to the AGN. Rotate the model to view the velocity distribution and the line-of-sight stripping becomes visible; in the cases of JO194 and JW100, distinct tails can be seen stretching out of the plane of the galaxy. Viewing the model for JW100 from the left reveals the rotation curve of the disk and the line-of-sight stripped gas extended toward the observer as the galaxy moves away.
Narrower clumps in the visualisation represent colder, denser regions of gas, while broader regions indicate hotter, diffuse clouds of stripped material. In the case of the galaxy disk, the central spike indicates broadened emission lines associated with the AGN. As mentioned above, this central spike is extremely prominent in OIII and can more easily be explored by hiding the stellar component.
The green component shows the OIII line, often associated with shocks, which reveals the interacting boundary between the intracluster medium and the gas within the galaxy, as well as any emission associated with the AGN. In the case of JW100, the OIII component shows an extremely prominent outflow from the centre of the disk in the line of sight, away from the observer.
Click each frame to activate the model viewer and use the mouse to interact. Fullscreen options are available using the toolbar in the viewer. Users with virtual reality or cardboard headsets have the option to view the model natively in VR by selecting "View in VR" in the viewer toolbar.
Red: Hydrogen alpha,
Blue: NII,
Green: OIII,
White: Stellar Component