Unbarred_spiral_galaxy

Unbarred spiral galaxy

Unbarred spiral galaxy

Type of spiral galaxy without a central bar

An unbarred spiral galaxy[1][2] is a type of spiral galaxy without a central bar, or one that is not a barred spiral galaxy. It is designated with an SA in the galaxy morphological classification scheme.

The Whirlpool Galaxy and its companion satellite. The Whirlpool is an unbarred spiral galaxy

Barless spiral galaxies are one of three general types of spiral galaxies under the de Vaucouleurs system classification system, the other two being intermediate spiral galaxy and barred spiral galaxy. Under the Hubble tuning fork, it is one of two general types of spiral galaxy, the other being barred spirals.

Grades

Under the de Vaucouleurs classification system, SA-galaxies are one of three types of spiral galaxy
More information Example, Type ...
An example of this type, imaged by the Hubble Space Telescope

Unbarred lenticular galaxy

An unbarred lenticular galaxy is a lenticular version of an unbarred spiral galaxy. They have the Hubble type of SA0.

An example of this is the galaxy, AM 0644-741. For other examples see Category:Unbarred lenticular galaxies.

References

  1. [1]
    Astronomical Journal, "Near-infrared surface photometry and morphology in virgo cluster spiral galaxy nuclear regions", Bernard J. Rauscher, April 1995, Bibcode:1995AJ....109.1608R, doi:10.1086/117389
  2. [2]
    Astronomy Pictures, "M99" (accessed 18 April 2010)


Stub icon

This spiral galaxy article is a stub. You can help Wikipedia by expanding it.
Share this article:

This article uses material from the Wikipedia article Unbarred_spiral_galaxy, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.