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Title: Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, Sb ... Post by: symbo on Mar 21, 2017 Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, Sb and Sc. However, many spiral galaxies are aligned edge-on and their spiral arms cannot be seen. Which other parameter that can be easily seen edge-on, is directly related to spiral arm tightness and can be used to provide this classification?
(a) The size of the nuclear bulge. (b) The overall diameter of the galaxy. (c) The overall intrinsic brightness of the galaxy, or its absolute magnitude. Title: Re: Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types ... Post by: hyponotica on Mar 21, 2017 Content hidden
Title: Re: Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, Sb ... Post by: symbo on Jul 10, 2017 This did it for me! Thank you
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