Barred spiral galaxy

This article was the featured article on 27 August 2023.

A barred spiral galaxy, classified SB is a spiral-galaxy with a central bar-shaped structure as the galactic-core composed of old stars.

Examples

The Milky Way, which the Sun and earth are in, is a barred spiral galaxy.

Some face-on barred spiral galaxies are ngc-4921, ngc-1073, m91, m95, and ugc-12158.

Classification

The classification for barred spiral galaxies is SB (spiral, barred).

There are 6 subtypes:

• SBa has tightly bound spiral-arms
• SBb, SBc, and SBd have increasingly looser arms
• SB0 is a barred lenticular-galaxy
• SBm is a magellanic-spiral - a barred irregular-galaxy

While the last 2 aren't spiral galaxies, they are still considered as barred spiral galaxies. Template:Wr