each of the nine galaxies shown above.
the inclination of the galaxy or explain why you cant in each case.
galaxy B above, you measure the Doppler shift of the 21 cm to be 60km/s at a point near
the bottom of the image. Convert to estimated orbital velocity of the gas.
observe some galaxy spectroscopically and determine its metallicity to be
1.5. What type of galaxy should you
expect it to be, and why?
generic galaxy rotation curve has the velocity rise linearly from 0 at the center to
200km/s at 5kpc from the center. Then it
remains constant at 200km/s out to 15kpc beyond which it cant be measured. a) Make a
plot of M(r), the total mass internal to the radius as a function of radius. Use grams for
y coordinate. b) Make a plot of the density
of the dark matter in g/cc vs radius, assuming the dark matter is spherically symmetric.
the same galaxy described in problem 5, estimate k/w as a function
of radius, where k is the epicycle frequency and w is the orbit