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SUMMARY:ULXs as progenitors of merging compact binary systems
DTSTART;VALUE=DATE-TIME:20230706T080000Z
DTEND;VALUE=DATE-TIME:20230706T082000Z
DTSTAMP;VALUE=DATE-TIME:20260606T230222Z
UID:indico-contribution-8873@events.saip.org.za
DESCRIPTION:Speakers: Lutendo Nyadzani (Centre for Astro-Particle Physics 
 and Department of Physics\, University of Johannesburg\, Auckland Park 200
 6\, South Africa)\nUsing Ultra-Luminous X-ray (ULX) sources as progenitors
  of compact binary systems\, we estimate the coalescence rate of compact b
 inary systems. ULXs are extra-galactic X-ray sources with apparent luminos
 ity > 10^{39} erg/s. They are thought to be accreting NS or BH. The mechan
 ism of how these systems reach such high luminosity is still unknown. 10^{
 39} erg/s is above the Edington accretion limit for a 10M_{\\odot} BH. The
 re are a few explanations for such high luminosities: (1) NS/BH accreting 
 at super-Eddington accretion rate\, (2) highly beamed emission\, and (3) e
 mission from an intermediate-mass black hole with a mass of 100M_{\\odot} 
 to 10^5M_{\\odot} at sub-Eddington accretion. Observation of some ULX syst
 ems suggests NSs accreting with beamed emission with massive companions. E
 ventually\, some of these companion stars will become compact objects\, fo
 rming compact binary systems which are potential progenitors of gravitatio
 nal waves and short GRBs. Assuming all merging compact binary systems unde
 rgo a ULX phase\, we simulate a population of binary stars and follow thei
 r evolutionary history. We compute the merger rate from the compact binari
 es that went through a ULX phase.\n\nhttps://events.saip.org.za/event/239/
 contributions/8873/
LOCATION:University of Zululand
URL:https://events.saip.org.za/event/239/contributions/8873/
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