What transformation does ram-pressure stripping cause in a spiral galaxy?
Transitioning from spiral to elliptical, becoming red and dead
Ram-pressure stripping is a powerful environmental effect that dramatically alters the internal state and morphology of galaxies residing in the dense intracluster medium (ICM). Spiral galaxies rely on their cooler interstellar gas to fuel ongoing star formation. When these spirals move rapidly through the dense, hot ICM, the pressure exerted strips away this crucial star-forming fuel. Without this gas reservoir, the ongoing process of creating new, blue stars ceases, causing the galaxy to become 'quenched' or 'red and dead.' Furthermore, the disruptive process, coupled with frequent mergers typical in cluster cores, often leads to a morphological transformation, with the spiral structure giving way to a more rounded elliptical galaxy shape.

#Videos
Why Are Galaxy Clusters Important For Understanding The Universe?