In Part 6 of this course you read about Hubble’s “tuning fork” diagram for classifying galaxies according as their shapes and features. In this assignment you will classify 10 galaxies and give brief justifications for your choices. Each galaxy is worth 4 points: 2 for the classification and 2 for the description

Requirements: good

Galaxy Classification

Overview: In Part 6 of this course you read about Hubble’s “tuning fork” diagram for classifying galaxies according as their shapes and features. In this assignment you will classify 10 galaxies and give brief justifications for your choices. Each galaxy is worth 4 points: 2 for the classification and 2 for the description.

A copy of Hubble’s diagram appears below. Recall that elliptical (E) galaxies are classified according as their ellipticity: E0 for spherical ones through E7 for very elliptical ones; a football would be about an E5. “Normal” spiral galaxies appear along the top of the “fork”: Sa through Sc, with increasing openness and “choppiness” of the spiral pattern and decreasing size of the central bulge. “Barred” spirals appear along the bottom of the fork: SBa through SBc, again with increasing openness of the spiral pattern and decreasing size of the central bulge, but accompanied by a central linear bar that passes through the galactic centre and often connects directly to a couple of major spiral arms. S0 galaxies are flattish with no distinct features; we did not address them in Part 6 of the course and so none will appear in this assignment. Some galaxies are “intermediate,” as in Sab; there is an element of “judgement call” involved here. Not shown in the diagram below is a catch-all “Irregular” (Irr) class for those that aren’t of type E or S.

Take a look at the galaxy pictures below and formulate your classifications and comments. They appear in no particular order. When you click on the Moodle quiz for this assignment, you will see these same pictures of galaxies again and for each one, you’ll be offered a place to choose a classification type and space to type or paste your comments. Remember that, as mentioned above, there is often some room for judgement in galaxy classification. If your classification is different from the accepted one, I’ll be looking at your justification comments to see how you arrived at your decision. Partial credit is definitely possible.

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