Hubble Captures M88 on Journey to Center of Virgo Cluster
This NASA/ESA Hubble Space Telescope image features the spiral galaxy Messier 88 (M88). Credit: ESA/Hubble & NASA, D. Thilker
The focus of this NASA/ESA Hubble Space Telescope image is an active spiral galaxy on a journey lasting hundreds of millions of years. The galaxy Messier 88 (M88), also known as NGC 4501, is located about 63 million light-years away in the constellation Coma Berenices (Berenice’s Hair).
M88 is an active galaxy, which means that its center harbors a supermassive black hole that is snacking on gas and dust. Astronomers estimate the black hole is around 100 million times as massive as the Sun, and it appears to be powering outflows of gas from the galaxy’s center.
A population of old, reddish stars around the black hole give M88 its warmly glowing heart. Spreading out from the galaxy’s center are several tightly wound, symmetrical spiral arms, each outlined by sparkling pink and blue star clusters and knotted clouds of dust. We see M88 from an angle that makes it appear elongated, and its spiral arms delicately fan out before it.
M88 is a member of the Virgo Cluster, a collection of more than a thousand galaxies held together by gravity. As this massive galaxy group moves through space, the galaxies themselves are in constant motion as they orbit the cluster’s center of gravity. M88 itself is on a long and somewhat perilous cosmic journey that will bring it to the innermost reaches of the cluster.
As is the case with any epic journey, M88 will be fundamentally changed by its trek to the center of the Virgo Cluster, about two million light-years from where it is today. In 200–300 million years, M88 will make its closest approach to Messier 87, the massive elliptical galaxy that anchors the entire cluster. As it draws close to this gravitational behemoth, M88 will experience intense ram pressure stripping. Ram pressure stripping is a process through which a galaxy’s gas is swept away as it pushes through the ever-present gas between the galaxies in a cluster.
(Source: science.nasa.gov)
