Sombrero Galaxy

The Sombrero Galaxy is one of the most visually distinctive galaxies in the sky — a broad flat disk of stars bisected by a prominent dark dust lane and topped by a massive bright bulge, resembling the brim and crown of a Mexican sombrero hat. It sits near the southern edge of the Virgo Cluster of galaxies.

The galaxy’s large bulge is unusual for a spiral galaxy — it contains roughly 800 billion solar masses in the bulge alone, and the central region hosts a supermassive black hole with an estimated mass of one billion solar masses, among the largest known in nearby galaxies.

The sharp dark dust lane is a nearly edge-on view of the galaxy’s spiral structure. Closer inspection of the dust lane reveals complex sub-structure: multiple filaments and knots where material is actively condensing into new stars. The outer halo, visible in deeper exposures, contains nearly 2,000 globular clusters — ten times more than the Milky Way — a reflection of the galaxy’s massive, ancient bulge population.

The 2003 Hubble mosaic combined images from six separate ACS pointings and is one of the most detailed images of an external galaxy ever assembled.