Intermediate spiral galaxy

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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.

Examples

Example	Type	Information	Notes
	SAB0-	SAB0- is a type of lenticular galaxy
	SAB0	SAB0 is a type of lenticular galaxy
	SAB0+	SAB0+ is a type of lenticular galaxy
	SAB0/a	SAB0/a can also be considered a type of intermediate lenticular galaxy
Messier 65	SABa		M65 is an "SAB(rs)a"
NGC 4725	SABab		NGC 4725 is an "SAB(r)ab pec"
Messier 66	SABb		M66 is an "SAB(s)b"
Messier 106	SABbc		M106 is an "SAB(s)bc"
Sculptor Galaxy	SABc		Sculptor is an "SAB(s)c"
NGC 2403	SABcd		NGC 2403 is an "SAB(s)cd"
	SABd
	SABdm	SABdm can also be considered a type of intermediate Magellanic spiral
NGC 4625	SABm	SABm is a type of Magellanic spiral (Sm)	NGC 4625 is an "SAB(rs)m pec"
Fireworks Galaxy	SAB(rs)cd		NGC 4625 is an "SAB(rs)cd"

References

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

v t e Galaxies
Morphology	Disc Lenticular barred unbarred Spiral anemic barred flocculent grand design intermediate Magellanic unbarred Dwarf galaxy elliptical irregular spheroidal spiral Elliptical galaxy cD Irregular barred Peculiar Ring Polar
Structure	Active galactic nucleus Bar Bulge Central massive object Galactic Center Dark matter halo Disc Disc galaxy Halo corona Galactic plane Galactic ridge Interstellar medium Protogalaxy Galaxy filament Spiral arm Supermassive black hole Ultramassive
Active nuclei	Blazar BL Lacertae object LINER Little Red Dots Markarian Quasar Radio X-shaped DRAGN Relativistic jet Seyfert
Energetic galaxies	Lyman-alpha emitter Lyman-break Luminous infrared ULIRG HLIRG ELIRG Starburst blue compact dwarf pea faint blue Luminous infrared galaxy Hot dust-obscured Green bean galaxy Hanny's Voorwerp Wolf-Rayet galaxy
Low activity	Low surface brightness Ultra diffuse Dark galaxy Red nugget Blue Nugget Dead disk
Interaction	Field Galactic tide Groups and clusters group cluster Brightest cluster galaxy fossil group Interacting merger collision cannibalism Jellyfish Satellite Stellar stream Superclusters Walls Voids and supervoids void galaxy
Lists	Galaxies Galaxies named after people Largest Nearest Polar-ring Ring Spiral Groups and clusters Large quasar groups Quasars List of the most distant astronomical objects Starburst galaxies Superclusters Voids
See also	Extragalactic astronomy Galactic astronomy Galactic coordinate system Galactic habitable zone Galactic magnetic fields Galactic orientation Galactic quadrant Galaxy color–magnitude diagram Galaxy formation and evolution Galaxy rotation curve Gravitational lens Gravitational microlensing Illustris project Intergalactic dust Intergalactic stars Intergalactic travel Population III stars Galaxy X (galaxy)
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