A Thin Disc Galaxy: NGC3198
Not a point source, extending over 200,000 light years across.
Outside the core region
- Velocity is constant at 150,000 m/s.
-
Mass density decreases exponentially,
mass/area = 37 Exp (-R'/2.23') solar masses/pc2.
-
Total mass is 1.0 x 1040 kg.
![](http://www.TheWorld.com/~sweetser/Images/40.jpg)
![](http://www.TheWorld.com/~sweetser/Images/NGC3198_pic_profile.jpg)
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