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| Radio: The “Spider” Isovelocity |
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| Diagram, interpreting HI maps |
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| Vrad
= Vsys + Vrot sin β cos θ |
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| Where β is the inclination angle, |
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| θ is the angle relative to major axis, |
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| And there are no non-circular velocities |
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| So what might we expect to see for non- |
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| circular velocities?
And from what effects? |
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