Chapter 26,27: Galaxies

Question 1

What kind of galaxies are there?

Answer 1

Elliptical, Normal Spiral, Barred Spiral, and Irregular/Peculiar

Question 2

What are spiral galaxies?

Answer 2

Sa = smooth, broad spiral arms and largest central bulge
Sc = narrow, well-defined arms and smallest central bulge

Question 3

What are barred spiral galaxies?

Answer 3

SBa = smoothest spiral arms and largest central bulge
SBc = narrow, well-defined arms and smallest central bulge (milky way)

Question 4

What is an elliptical galaxy?

Answer 4

little rotation, no gas, reddish colors.

Question 5

What are irregular galaxies?

Answer 5

small and large Magellanic clouds.

Question 6

What are active galaxies?

Answer 6

non-stellar radiation (most light does not come from stars). unusual because luminosity is dominated by activity in and around the center.

Question 7

What are Quasars?

Answer 7

Supermassive black hole with a disk (need a spectrum to tell them apart)