Institute of Cosmology and Gravitation

  • Home
  • News
    • Positions available
  • ICG Members
    • ICG Academic Staff
    • ICG Professional and Support Staff
    • ICG Research Staff
    • ICG Students
  • For The Public
    • New to Cosmology?
    • Upcoming Events
    • Schools Outreach
    • Outreach Resources
      • Cosmic Stroll
    • Research Experience
    • Athena SWAN @ ICG
    • Dignity & Respect
  • Research Overview
    • The Very Early Universe
    • Dark Energy
    • Late-time Acceleration
    • Large Scale Structure
    • Relativistic Cosmology
    • Gravitational Lensing
    • Transients
    • Galaxy Evolution
    • Stellar Population Modelling
    • Gravitational Waves
  • Talks, Lectures, Meetings
    • Colloquia
    • Tuesday Lunch
    • Theoretical Cosmology
    • Lectures
    • Galaxy Breakfast
    • LSS Meetings
    • Lensing Meetings
    • Gravity Meetings
    • UoP Workshops
    • GRADnet
  • Study With Us
    • Physics@Portsmouth
    • SEPnet
    • DISCnet
  • Contact Us

Tyrone Woods (Birmingham), Titans of the Early Universe: The Origin of the Most Massive High-z Quasars

September 18, 2018 By Daniel Whalen


Event Details

  • Date: October 11, 2018 2:30 pm – 3:30 pm
  • Categories: Seminar

The discovery of billion solar mass quasars at redshifts of 6-7 challenges our understanding of the early Universe; how did such massive objects form in the first billion years? Observational constraints and numerical simulations increasingly favour the “direct collapse” scenario. In this case, an atomically-cooled halo of primordial composition accretes rapidly onto a single protostellar core, ultimately collapsing through the Chandrasekhar-Feynman instability to produce a supermassive (~100,000 solar mass) “seed” black hole. In this talk, I’ll present a systematic study of the lives and deaths of these objects, using the 1D implicit hydrodynamics and stellar evolution code KEPLER. We include post-Newtonian corrections to gravity and a detailed treatment of nuclear burning processes using an adaptive network. We find a simple relation between the infall rate and the final mass at collapse, and rule out the existence of rapidly-rotating supermassive stars. I’ll also discuss the possibility of early chemical enrichment from these objects, observational prospects in the era of the JWST, and briefly summarize other future directions agreed upon at our workshop “Titans of the Early Universe” held at the Monash Prato Centre in Italy, in November of last year.


Event Details

  • Date: October 11, 2018 2:30 pm – 3:30 pm
  • Categories: Seminar

promo-button-public1promo-button-partners11promo-button-members1

Latest News

  • Project to help vision impaired people engage with astronomy wins award
  • Bumper crop of black holes in new gravitational wave paper
  • Major EU grant to unravel the mysteries of the Universe
  • Ripples from deep in the Cosmos reveal most massive black hole detected yet
  • Astrophysicists fill in 11 billion years of Universe history.

Coming up

  • Anut Sangka on January 19, 2021 12:00 pm
  • Wentao Luo (IPMU, Japan) on January 20, 2021 1:00 pm
  • Galaxy breakfast on January 21, 2021 12:00 pm
  • Kate Maguire (TCD), TBA on January 21, 2021 2:30 pm
  • Science Chat on January 22, 2021 11:00 am

Quick Links

  • How to get to the ICG
  • Upcoming Events
  • Additional Links

Twitter

Tweets by @UoPCosmology

Facebook

Design by FingerprintDigitalMedia.com
Copyright © 2021 ICG, Portsmouth

Institute of Cosmology and Gravitation Cookies Policy

Our Website uses cookies to improve your experience. Please visit our Cookies and privacy page for more information about cookies and how we use them.

Close