Colloquium on 23 November 2017
Massive stars and intermediate mass black holes in young stellar clusters

Details

Title: Massive stars and intermediate mass black holes in young stellar clusters
Speaker: Sergei Fabrika (SAO RAS)
Date: Thursday, 23 November 2017
Time: 11:00 - 12:00
Venue: SAAO Auditorium

Abstract

It is well known from N-body simulations that in young stellar clusters a very massive star (VMS) could be formed during first 1-2 million years because of direct encounters. Later this VMS will collapse to an intermediate mass black hole (IMBH). In a certain time of its evolution, the IMBH may produce the super-Eddington accretion.
During several million years massive stars must be ejected from young clusters due to three or four not direct encounters. Depending on a stellar mass, and mainly on under-solar abundance, the VMSs may produce pair-instability supernovae (PISNe) or IMBHs. We selected a sample of young stellar clusters, which are located in nearby galaxies with the highest star formation rate and started a new program of direct spectroscopy of this sample using Russian 6m telescope at the Northern hemisphere and SALT telescope at the Southern hemisphere. The observational program is just started, but we will report in our talk on the finding of one IMBH candidate and a few VMS candidates.

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