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SUMMARY:Early Black-Hole Growth Constraints from JWST
DTSTART;VALUE=DATE-TIME:20261028T164500Z
DTEND;VALUE=DATE-TIME:20261028T165500Z
DTSTAMP;VALUE=DATE-TIME:20261024T125544Z
UID:indico-contribution-3649@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Nicole Jiang (University of Toronto)\n**Aims.** Mass
 ive black holes in the early Universe had limited time to assemble. We ide
 ntify which JWST black-hole candidates place the strongest constraints on 
 early growth models and assess how these constraints depend on mass estima
 tes and growth assumptions. **Methods.** We compile 350 published measurem
 ents at $z\\geq4$ and analyse a primary sample of 220 objects with broad B
 almer-line masses. An expanded sample adds 13 tentative or conditional Bal
 mer-line candidates and GN-z11\, whose mass is inferred from ultraviolet l
 ines. We propagate reported mass uncertainties and test mass-scale shifts 
 and alternative growth assumptions. **Results.** For $100\\\,M_\\odot$ see
 ds formed at $z=30$\, radiative efficiency $\\epsilon=0.1$\, and no merger
  boost\, 8 of the 220 objects require a lifetime-average Eddington ratio $
 \\overline{f}_{\\mathrm{Edd\,req}}>1$. Five exceed unity in at least 95% o
 f Monte Carlo draws using the reported mass uncertainties. For UNCOVER-204
 66\, COSMOS3D-13852\, and RUBIES-EGS-55604\, at least 95% of draws still r
 equire an average Eddington ratio above 1 after reducing each mass by $0.5
 $ dex (a factor of approximately 3.2). Delaying seeding to $z=20$ gives GN
 -z11 the highest required average Eddington ratio. At $\\epsilon=0.05719$\
 , the ideal thin-disc efficiency for a non-spinning black hole\, all 234 c
 entral mass estimates are reachable from $100\\\,M_\\odot$ seeds formed at
  $z=30$ without lifetime-average accretion above the Eddington limit.\n\nh
 ttps://nyx.physics.mcgill.ca/event/587/contributions/3649/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3649/
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