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Density wave theory is the preferred explanation for the well-defined structure of grand design spirals, [2] first suggested by Chia-Chiao Lin and Frank Shu in 1964. [3] The term "grand design" was not used in this work, but appeared in the 1966 continuation paper; [4] Lin [5] (along with Yuan and Shu [6]) is usually credited with coining of the term.
NGC 1232 is a face-on spiral galaxy. It can be technically considered a grand-design galaxy and is considered a prototype for multi-arm spiral galaxies. [7] Its galactic bulge is small. While NGC 1232 is classified as an intermediate spiral galaxy, the bulge shows hints of a galactic bar. [7]
NGC 5643 is a grand design spiral galaxy, with two well-defined, symmetric arms. In the circumnuclear region are other dust spirals, but the two main dust arms are wider. [ 4 ] The galaxy is seen nearly face on, at an inclination of ~ 27°.
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NGC 4088 is a grand design spiral galaxy. [5] This means that the spiral arms in the galaxy's disk are sharply defined. In visible light, one of the spiral arms appears to have a disconnected segment. Halton Arp included this galaxy in the Atlas of Peculiar Galaxies as one of several examples where this phenomenon occurs. [6]
M83 is a massive, grand design spiral galaxy. [10] Its morphological classification in the De Vaucouleurs system is SAB(s)c, [ 2 ] where the 'SAB' denotes a weak-barred spiral, '(s)' indicates a pure spiral structure with no ring, and 'c' means the spiral arms are loosely wound. [ 11 ]
This type of galaxy is known as "grand design". [1] NGC 7541 is actually observed to have a higher-than-usual star formation rate, adding weight to the theory that spiral bars act as stellar nurseries, corralling and funneling inwards the material and fuel needed to create and nurture new baby stars . [ 3 ]
Messier 74 (also known as NGC 628 and Phantom Galaxy) is a large spiral galaxy in the equatorial constellation Pisces. [a] It is about 32 million light-years away from Earth. [6] The galaxy contains two clearly defined spiral arms and is therefore used as an archetypal example of a grand design spiral galaxy. [7]