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X-WR-CALNAME;VALUE=TEXT:ITC Seminar - Ben Bar-Or (IAS)
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SUMMARY:ITC Seminar - Ben Bar-Or (IAS)
DESCRIPTION:<p> </p><div>Feeding central black holes with stars</div><div> </div><div>Abstract:</div><div> </div><div>Galactic nuclei and the Massive black holes in their centers are rich</div><div>environments, where the complex stellar dynamics plays an important role in</div><div>many physical phenomena. We show how the dynamics of this nearly-Keplerian</div><div>N-body system, where the angular momentum evolution is accelerated by resonant</div><div>relaxation, can be described and studied in a formal statistical mechanics</div><div>framework. We combine the Fokker-Plank description of two-body relaxation and</div><div>resonant relaxation to study the loss-cone dynamics in Galactic nuclei. We show</div><div>that low-mass black hole seeds that grow in a locally dense environment by</div><div>accreting stars in galactic nuclei that follow a universal M-sigma relation,</div><div>all grow over the age of the universe above a present-day mass scale M ~</div><div>10^5-10^6 Msun. This can explain why no Intermediate-mass black holes were</div><div>found to date, and implies that most present-day galaxies with sigma &lt; 50 lack</div><div>a central black hole. AGNs in low mass galaxies may provide evidence for</div><div>central black holes which grow mainly by accrediting stars, and their velocity</div><div>dispersion distribution can be used to test this model.</div><p> </p>
LOCATION:Phillips
STATUS:CONFIRMED
DTSTART:20170207T170000Z
DTEND:20170207T180000Z
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