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Anunbarred spiral galaxy[1][2] is a type ofspiral galaxy without a central bar, or one that is not abarred spiral galaxy. It is designated with anSA in thegalaxy morphological classification scheme. A nearby example of an unbarred spiral is theTriangulum Galaxy.
Barless spiral galaxies are one of three general types of spiral galaxies under thede Vaucouleurs system classification system, the other two beingintermediate spiral galaxy and barred spiral galaxy. Under theHubble tuning fork, it is one of two general types of spiral galaxy, the other being barred spirals.
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| Example | Type | Image | Information | Notes |
|---|---|---|---|---|
| SA0- | SA0- is a type oflenticular galaxy | |||
| SA0 | SA0 is a type oflenticular galaxy | |||
| SA0+ | SA0+ is a type oflenticular galaxy | |||
| NGC 3593 | SA0/a |  | SA0/a can also be considered a type ofunbarred lenticular galaxy | NGC 3593 is an "SA(s)0/a" |
| NGC 3169 | SAa |  | NGC 3169 is an "SA(s)a pec" | |
| Messier 81 | SAab |  | M81 is an "SA(s)ab" | |
| Messier 88 | SAb |  | M88 is an "SA(rs)b" | |
| NGC 3949 | SAbc |  | NGC 3949 is an "SA(s)bc" | |
| NGC 4414 | SAc | .jpg) | NGC 4414 is an "SA(rs)c" | |
| Triangulum Galaxy | SAcd |  | Triangulum is an "SA(s)cd" | |
| NGC 300 | SAd |  | NGC 300 is an "SA(s)d" | |
| NGC 45 | SAdm |  | SAdm can also be considered a type ofunbarred Magellanic spiral | NGC 45 is an "SA(s)dm" |
| NGC 4395 | SAm |  | SAm is a type ofMagellanic spiral (Sm) | NGC 4395 is an "SA(s)m" |
Anunbarred lenticular galaxy is alenticular version of an unbarred spiral galaxy. They have theHubble type ofSA0.
An example of this is the galaxyAM 0644-741. For other examples, seeCategory:Unbarred lenticular galaxies.
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