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Unformatted text preview: molecular ring
– Page 2 of 4 – around the galactic center, which is not a part of this model.
b. Now, make a different galaxy model where the rotation velocity drops as a
Keplerian model (r-1/2), this involves changing the .csv file. Explain how
you created the .csv file. By this I mean describe how you made the data
file from a mathematical point of view, not a technical point of view.
c. Using this alternative “Keplerian” model, run the IPython notebook to the
end. What changes do you see in the l-v diagram, compared to the
“realistic” Milky Way model results? Is it obvious that the Keplerian
model doesn’t work at reproducing the observed l-v diagram? Include
copies of the images (the IPython notebook does export the final image as
a PNG). 3. [C&O 25.4] Neglecting the effects of extinction and the K-correction (which
takes into account cosmological redshift changing the bandpass of the emitted
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- Spring '14