Intermediate_spiral_galaxy

Intermediate spiral galaxy

Intermediate spiral galaxy

Galaxy type intermediate between a spiral galaxy and barred spiral galaxy

An intermediate spiral galaxy is a galaxy that is in between the classifications of a barred spiral galaxy and an unbarred spiral galaxy. It is designated as SAB in the galaxy morphological classification system devised by Gerard de Vaucouleurs.[1] Subtypes are labeled as SAB0, SABa, SABb, or SABc, following a sequence analogous to the Hubble sequence for barred and unbarred spirals. The subtype (0, a, b, or c) is based on the relative prominence of the central bulge and how tightly wound the spiral arms are.

Diagram of the Hubble - de Vaucouleurs morphological classification system illustrating the class of intermediate spirals.
Messier 83 is an intermediate spiral galaxy of type SABc located in the constellation Hydra.

Examples

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References

  1. [1]
    de Vaucouleurs, Gerard (1963). "Revised Classification of 1500 Bright Galaxies". Astrophysical Journal Supplement. 8: 31. Bibcode:1963ApJS....8...31D. doi:10.1086/190084.


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