COMA BERENICES — The Hubble Space Telescope captured an image of the spiral galaxy Messier 88 (M88), which is currently undergoing ram pressure stripping as it moves toward the center of the Virgo Cluster. Researchers have already observed this process affecting the galaxy, with its disk of gas appearing truncated and compressed on its leading edge, where gas and dust are piling up like snow before a plough.
Messier 88 is located about 63 million light-years away in the constellation Coma Berenices and is a member of the Virgo Cluster, a gravitationally bound collection of more than a thousand galaxies. The galaxy, also known as NGC 4501, is an active galaxy with a supermassive black hole at its center estimated to be around 100 million times as massive as the Sun. This black hole appears to be powering outflows of gas from the galaxy’s core.
Messier 88 has several tightly wound, symmetrical spiral arms outlined by pink and blue star clusters and knotted clouds of dust. A population of old, reddish stars surrounds the central black hole, giving the galaxy a warmly glowing heart. The galaxy is viewed from an angle that makes it appear elongated, with its spiral arms fanning outward.
The Virgo Cluster moves through space, with its constituent galaxies orbiting the cluster’s center of gravity. Messier 88 is on a journey that will bring it to the innermost reaches of the cluster, about two million light-years from its current position. In 200–300 million years, Messier 88 will make its closest approach to Messier 87, the massive elliptical galaxy at the cluster’s core.
As Messier 88 approaches Messier 87, it will experience intense ram pressure stripping. This process occurs when a galaxy’s gas is swept away as it moves through the intergalactic gas present in a cluster. The effects of this phenomenon are already visible in Hubble’s image, demonstrating how environmental forces in dense galaxy clusters can shape galactic evolution.