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Dark-ages Reionization & Galaxy Formation Simulation I: The dynamical lives of high redshift galaxies

Poole, Gregory ; Angel, Paul ; Mutch, Simon ; Power, Chris ; Duffy, Alan ; Geil, Paul ; Mesinger, Andrei ; Wyithe, Stuart; Wyithe, Stuart (pacrepositoryorg)

arXiv.org, Mar 21, 2016 [Tạp chí có phản biện]

DOI: 10.1093/mnras/stw674

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  • Nhan đề:
    Dark-ages Reionization & Galaxy Formation Simulation I: The dynamical lives of high redshift galaxies
  • Tác giả: Poole, Gregory ; Angel, Paul ; Mutch, Simon ; Power, Chris ; Duffy, Alan ; Geil, Paul ; Mesinger, Andrei ; Wyithe, Stuart
  • Wyithe, Stuart (pacrepositoryorg)
  • Chủ đề: Stars & Galaxies ; Acquisitions & Mergers ; Star & Galaxy Formation ; Galactic Halos ; Red Shift ; Ionization ; Galaxies ; Recovery Time ; Energy Dissipation ; Galactic Evolution ; Computer Simulation ; Astronomical Models ; Astrophysics of Galaxies ; Cosmology and Nongalactic Astrophysics
  • Là 1 phần của: arXiv.org, Mar 21, 2016
  • Mô tả: We present the Dark-ages Reionization and Galaxy-formation Observables from Numerical Simulations (DRAGONS) program and Tiamat, the collisionless N-body simulation program upon which DRAGONS is built. The primary trait distinguishing Tiamat from other large simulation programs is its density of outputs at high redshift (100 from z=35 to z=5; roughly one every 10 Myr) enabling the construction of very accurate merger trees at an epoch when galaxy formation is rapid and mergers extremely frequent. We find that the friends-of-friends halo mass function agrees well with the prediction of Watson et al. at high masses, but deviates at low masses, perhaps due to our use of a different halo finder or perhaps indicating a break from "universal" behaviour. We then analyse the dynamical evolution of galaxies during the Epoch of Reionization finding that only a small fraction (~20%) of galactic halos are relaxed. We illustrate this using standard relaxation metrics to establish two dynamical recovery time-scales: i) halos need ~1.5 dynamical times following formation, and ii) ~2 dynamical times following a major (3:1) or minor (10:1) merger to be relaxed. This is remarkably consistent across a wide mass range. Lastly, we use a phase-space halo finder to illustrate that major mergers drive long-lived massive phase-space structures which take many dynamical times to dissipate. This can yield significant differences in the inferred mass build-up of galactic halos and we suggest that care must be taken to ensure a physically meaningful match between the galaxy-formation physics of semi-analytic models and the halo finders supplying their input.
  • Ngôn ngữ: English
  • Số nhận dạng: DOI: 10.1093/mnras/stw674

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