Spherically-symmetric Accretion onto a Black Hole at the Center of a Young Stellar Cluster

Details Spherically-symmetric Accretion onto a Black Hole at the Center of a Young Stellar Cluster Spherically-symmetric Accretion onto a Black Hole at the Center of a Young Stellar Cluster

2008-06-18

arxiv.org/abs/0806.3054v1

Astronomy and Astrophysics

Astrophysics

23 pages, 9 figures, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/591226

We present a self-consistent, bimodal stationary solution for spherically symmetric flows driven by young massive stellar clusters with a central supermassive black hole. We demonstrate that the hydrodynamic regime of the flow depends on the location of the cluster in the 3D (star cluster mechanical luminosity - BH mass - star cluster radius) parameter space. We show that a threshold mechanical luminosity (L_crit) separates clusters which evolve in the BH dominated regime frome those whose internal structure is strongly affected by the radiative cooling. In the first case(below the threshold energy) gravity of the BH separates the flow into two distinct zones: the inner accretion zone and the outer zone where the star cluster wind is formed. In the second case (above the critical luminosity), catastrophic cooling sets in inside the cluster. In this case the injected plasma becomes thermally unstable that inhibits a complete stationary solution. We compared the calculated accretion rates and the BH luminosities with those predicted by the classic Bondi accretion theory and found that Bondi's theory is in good agreement with our results in the case of low mass clusters. However, it substantially underestimates the accretion rates and BH luminosities if the star cluster mechanical luminosity, L_sc, approaches the threshold value (L_sc > 0.1 L_crit).

Affiliated with

Also associated with

No associations

Rating

Spherically-symmetric Accretion onto a Black Hole at the Center of a Young Stellar Cluster does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spherically-symmetric Accretion onto a Black Hole at the Center of a Young Stellar Cluster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spherically-symmetric Accretion onto a Black Hole at the Center of a Young Stellar Cluster will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-273397