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02164_Field_galaxy.txt
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1995-11-04
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617b
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17 lines
spiral pattern. The classification
system is as follows: an ΓÇ£SΓÇ¥ for
ΓÇ£spiral,ΓÇ¥ is followed by an ΓÇ£a,ΓÇ¥ ΓÇ£b,ΓÇ¥
ΓÇ£c,ΓÇ¥ or ΓÇ£d,ΓÇ¥ to indicate the tightness
of the spiral, with ΓÇ£aΓÇ¥ being tightly
wound and ΓÇ£dΓÇ¥ being loose. Varying
degrees of compactness are indicated
by additional letters (e.g., an Scd
galaxy is between an Sc and an Sd). A
barred spiral is indicated with an
ΓÇ£SBΓÇ¥ followed by the corresponding a,
b, c, or d.
S0 galaxies are spirals that closely
resemble ellipticals; the spiral arms
are so tightly wound around the
bulge, which itself is very large, that