What is a SBA type of galaxy?

An SBA galaxy, or spiral barred galaxy, is a type of galaxy characterized by the presence of a central bar-like structure made up of stars, which extends from the nucleus into the spiral arms. This bar structure influences the motion of stars and gas within the galaxy, often leading to enhanced star formation in the spiral arms. SBA galaxies are categorized under the Hubble classification system and include well-known examples like the Milky Way. Their distinctive morphology contributes to their unique dynamics and evolutionary processes.