The Whirlpool Galaxy and its companion satellite. The Whirlpool is an unbarred spiral galaxy.
An unbarred spiral galaxy is a spiral galaxy that does not have a central bar. It is designated with an SA in the galaxy morphological classification scheme. The Sombrero Galaxy is classified as an unbarred spiral galaxy.
Barless spiral galaxies are one of three general types of spiral galaxies under the de Vaucouleurs system classification system, the other two being intermediate spiral galaxy and barred spiral galaxy. Under the Hubble tuning fork, it is one of two general types of spiral galaxy, the other being barred spirals.