On the Rotation of Supermassive Stars

摘要: Supermassive stars born from pristine gas in atomically-cooled haloes are thought to be the progenitors of supermassive black holes at high redshifts. However, way they accrete their mass is still an unsolved problem. In particular, for accretion proceed, a large amount angular momentum has extracted collapsing gas. Here, we investigate constraints stellar evolution imposes on this We present model Population III star including simultaneously and rotation. find that, form by accretion, accreted about 1% Keplerian momentum. This tight constraint comes $\Omega\Gamma$-limit, which combination radiation pressure centrifugal force cancels gravity. It implies that slow rotators, with surface velocity less than 10-20% first critical velocity, alone At such low velocities, deformation due rotation negligible.