Based on your analysis of the image and rotation curve of NGC 3198, why is the flatness of the rotation curve beyond the visible edge of the galaxy evidence for dark matter?
Based on your analysis of the image and rotation curve of NGC 3198, why is the flatness of the rotation curve beyond the visible edge of the galaxy evidence for dark matter?
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for 14 i observed the galaxy end aroung 5 kpc.
I need help with 18
Transcribed Image Text:Below is the measured rotation curve for the stars in NGC 3198.
14) Draw and label a vertical line at the radius where you observed the galaxy to end.
NGC 3198
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Radius (kpc)
Rotational
Speed (km/s)
Transcribed Image Text:Many spiral galaxies, including the Milky Way, have rotation curves similar to that of
NGC 3198. The enclosed mass (MR) continues to increase beyond the radius at which the
light of the galaxy stops. (In fact, the enclosed mass curve increases proportional to distance:
MR x R.)
18) Based on your analysis of the image and rotation curve of NGC 3198, why is the flatness
of the rotation curve beyond the visible edge of the galaxy evidence for dark matter?
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