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Supermassive Black Holes and their Environments

Supermassive Black Holes and their Environments. J örg M. Colberg with Tiziana Di Matteo Carnegie-Mellon University. The Simulation. Simulation just introduced by Tiziana 3,547 BHs at z=1 , plus all their progenitors (4.5m total) Using haloes and full particle sets at some redshifts.

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Supermassive Black Holes and their Environments

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  1. Supermassive Black Holes and their Environments Jörg M. Colberg with Tiziana Di Matteo Carnegie-Mellon University

  2. The Simulation • Simulation just introduced by Tiziana • 3,547 BHs at z=1, plus all their progenitors (4.5m total) • Using haloes and full particle sets at some redshifts

  3. So what does a BH merger tree look like?

  4. The Black Hole-Halo Connection Open circles: satellites, with (generally) low accretion • Most massive haloes host most massive BHs • At z=1, most active BHs live in haloes of mass 1012 Msun or less

  5. The next step: BHs-Haloes-Environment Satellite BHs in massive haloes low-mass haloes and low-mass BHs in underdense regions Low-mass haloes/BHs in wide range of environments!

  6. A bit of an aside: When do BHs form? Hierarchical growth along this line Most massive BHs do not follow hierarchical formation scenario

  7. More on environments and evolution z=3 reduced accretion sat’s z=1

  8. Smallest BHs oblivious of environment Large number of m < 107 Msun BHs in 1011 – 1012 Msun haloes grow very slowly, independent of environment

  9. BH Assembly: Mergers vs. Accretion • Only for the largest BHs, environmental effect on mergers vs. accretion: BHs in denser regions have slightly higher fractions of “merged” mass

  10. Summary • The most massive BHs live in the most massive haloes etc. • BUT the most massive z=1 BHs aren’t necessarily the most massive BHs at higher redshifts (c.f. Tiziana’s talk) • Environmental dependencies strongest for massive (> 108 Msun) BHs, both in mass, accretion rate, and mass assembly, and for satellite BHs (whose behaviour is consistent with their parent subhaloes having lost all their gas after infall into the larger halo) • Most small (< 107 Msun) BHs grow thru very slow accretion, with no mergers, independent of environment, with high zf > 2.5 • Massive (> 108 Msun) BHs form anti-hierarchically, whereas smaller BHs form hierarchically

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