The above visual wavelength image of a counter-clockwise rotating spiral galaxy indicates that the blueshifted emission lines are the dashed lines above the solid black horizontal line in the right panel and the redshifted emission lines are the dashed lines below the solid black horizontal line.

Question

Quizplus · Accepted Answer

The image does not provide any clear indication of which emission lines are blueshifted or redshifted, so it is not possible to determine based on the image alone.

The Above Visual Wavelength Image of a Counter-Clockwise Rotating Spiral