Infalling gas streamers, not disk self-gravity, can produce the convergent velocity signature around the AB Aur spiral arms that was used as evidence for gravitational instability.
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Infall Explains the Disk Kinematics of AB Aur Without Gravitational Instability
Infalling gas streamers, not disk self-gravity, can produce the convergent velocity signature around the AB Aur spiral arms that was used as evidence for gravitational instability.