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Stéphane Courteau

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TFR as a Tracer of DM<br />

Pure self-gravitating exponential disks should have<br />

∂logV(<br />

M )<br />

∂logR<br />

( M<br />

exp<br />

r = −<br />

0.<br />

5<br />

but observed spiral disks have<br />

∂logV 2.2<br />

∂logR exp<br />

r<br />

)<br />

= −0.08 ± 0.04

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