Investigating Gas and Stellar Kinematics using Marvin

We're going to study a galaxy (8711-6102) with an inner gas disk that is rotating faster than the stellar disk.

1. Get the Halpha velocity and stellar velocity maps

2. Create a map of the difference between the Halpha and stellar velocities

Hint: copy one of the maps and modify the value, mask, and property_name attributes.

3. Plot the difference map using the Marvin Maps plot function

4. Stack spectra in inner gas disk

5. Plot stacked spectra from red and blue sides using Marvin Spectrum plot functionality

Hint: divide the Halpha spectrum flux by 2 to get similar normalizations