Structural Components and Dynamics The architecture of a spiral galaxy is more complex than its appearance suggests. M81, M100 S or SBc Loose, fragmented arms with a small central bulge.
Spiral Galaxies Definition Rotation Curve Evidence
These are designated as SBa, SBb, and SBc, and they represent a distinct phase in galactic evolution, believed to channel gas toward the central black hole. This structure is traversed by one or more prominent spiral arms that wind outward from the center, creating a distinct visual pattern reminiscent of a pinwheel.
Surrounding the bulge is the galactic disk, a flattened structure where the spiral arms reside. Normal spirals, designated Sa, Sb, and Sc, feature a central bulge that grows larger and a disk that becomes more rectangular as the classification moves from 'a' to 'c'.
Spiral Galaxies Definition Rotation Curve Evidence
The primary components include the central bulge, the disk, and the halo. The bulge is a tightly packed group of older stars that often contains a supermassive black hole at its core.
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