Messier 88のRam-Pressure Strippingが、新しいハッブル画像で明らかになった。

Messier 88’s central black hole, about 100 million solar masses, glows in a new Hubble image that also captures the galaxy’s gas being stripped by the Virgo Cluster.

A Black Hole’s Glow

The image shows the bright core of M88, where the supermassive black hole is actively accreting gas and dust. Surrounding the core, red dots trace old stars, while pink and blue patches mark young star clusters and dust clouds. The galaxy stretches roughly 130,000 light‑years across, a size typical for spirals but unusual for a member of a dense cluster.

Ram Pressure in Real Time

Hubble’s view reveals gas on M88’s outer edge being compressed and piled up—a hallmark of ram‑pressure stripping. The Virgo Cluster, home to over 1,000 galaxies, exerts a gravitational pull that removes cold gas from spirals that plunge toward its center. M88’s lack of cold gas, compared to its size, confirms this process is already underway. The compression seen in the image matches the gravitational effects observed as M88 approaches the cluster’s core.

Future Encounter with Messier 87

Astronomers predict that in 200–300 million years M88 will reach its closest point to Messier 87, the cluster’s central giant elliptical. The impending encounter will intensify tidal forces and further strip material. Current observations of gas compression and reduced star‑forming fuel provide a snapshot of the evolutionary path that will culminate in this close approach.

Located about 60 million light‑years away in the constellation Coma Berenices, M88 was discovered by Charles Messier in 1781—one of nine objects he catalogued that night. The new Hubble image not only showcases the galaxy’s dramatic journey but also offers a tangible example of how cluster environments shape galaxy evolution. Future observations will track how the stripped gas disperses and whether any new star formation ignites in the wake of this cosmic interaction.

Source: NASA's Hubble captures gorgeous new photo of a spiral galaxy as it wanders through the Virgo Cluster
Domain: scientificamerican.com