What are head-tail galaxies?

Answer 1

Head-tail galaxies are a type of galaxy that exhibit a distinctive asymmetrical structure, characterized by a dense central region (the "head") and a long, trailing tail of stars and gas. This unique morphology often results from interactions with the intergalactic medium, particularly when a galaxy moves rapidly through a cluster of galaxies, causing gas to be stripped away. The tail can extend for a significant distance, creating a striking visual appearance. These galaxies provide insights into the effects of gravitational interactions and the dynamics of galaxy clusters.