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SUMMARY:The Final Mass and Early Growth of the Intermediate-Mass Black Hol
 e in Omega Centauri
DTSTART;VALUE=DATE-TIME:20261028T181600Z
DTEND;VALUE=DATE-TIME:20261028T181700Z
DTSTAMP;VALUE=DATE-TIME:20261025T203407Z
UID:indico-contribution-3700@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Mackenzie Hayduk (Saint Mary's University)\nIntermed
 iate-mass black holes (IMBHs)\, with masses between $10^2$ and $10^5$$M_\\
 odot$\, may represent a missing link between stellar and supermassive blac
 k holes\, yet few compelling candidates are known. In the Milky Way globul
 ar cluster Omega Centauri ($\\omega$ Cen)\, Häberle et al. (2024) recentl
 y identified several stars near the cluster centre with projected velociti
 es exceeding the escape velocity\, implying the presence of a central comp
 act object with a mass $M_\\bullet$ ≳ $8\\times$ $10^3 M_\\odot$ and mak
 ing it a strong IMBH candidate. We follow up on previous work in which we 
 jointly modelled the orbits of the five most reliably measured fast-moving
  stars. Simultaneously fitting Keplerian orbits to their sky positions\, p
 roper motions\, and line-of-sight velocities yielded an IMBH mass of $M_\\
 bullet = (6.4^{+0.8}_{-0.7}) \\times 10^4$ $M_\\odot$. We predict that sky
 -plane accelerations for the three innermost stars will become detectable 
 ($>3\\sigma$) by 2030\, which can confirm an IMBH and constrain its proper
 ties with greater precision. Our inferred mass agrees with Monte Carlo $N$
 -body simulations of $\\omega$ Cen (González Prieto et al. 2025)\, which 
 grow IMBHs to around ~ $50{\,}000$$M_\\odot$ over 12 Gyr from initial blac
 k hole seeds of $500$ - $5000$$M_\\odot$. However\, the formation mechanis
 ms for such massive seeds early in the cluster's evolution are an open que
 stion. Using rapid cluster-evolution models motivated by the initial condi
 tions of $\\omega$ Cen\, we identify viable seed-formation pathways throug
 h runaway stellar collisions and hierarchical black hole mergers.\n\nhttps
 ://nyx.physics.mcgill.ca/event/587/contributions/3700/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3700/
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