Browsing by Author "Hernquist, Lars"

Now showing items 1-20 of 29

    • The Bright Side of Black Holes: Radiation From Black Hole Accretion Disks 

      Zhu, Yucong (2015-05-15)
      An understanding of radiation is paramount for connecting observations of accretion disks with the theory of black holes. In this thesis, we explore via radiative transfer postprocessing calculations the observational ...

    • The colours of satellite galaxies in the Illustris simulation 

      Sales, L. V.; Vogelsberger, M.; Genel, S.; Torrey, P; Nelson, D.; Rodriguez-Gomez, Vicente; Wang, W.; Pillepich, A.; Sijacki, D.; Springel, V.; Hernquist, Lars Eric (Oxford University Press (OUP), 2014)
      Observationally, the fraction of blue satellite galaxies decreases steeply with host halo mass, and their radial distribution around central galaxies is significantly shallower in massive (M* ≥ 1011 M⊙) than in Milky ...

    • First Results From the IllustrisTNG Simulations: Matter and Galaxy Clustering 

      Springel, Volker; Pakmor, Rüdiger; Pillepich, Annalisa; Weinberger, Rainer; Nelson, Dylan; Hernquist, Lars; Vogelsberger, Mark; Genel, Shy; Torrey, Paul; Marinacci, Federico; Naiman, Jill (Oxford University Press (OUP), 2017-12-22)
      Hydrodynamical simulations of galaxy formation have now reached sufficient volume to make precision predictions for clustering on cosmologically relevant scales. Here, we use our new IllustrisTNG simulations to study the ...

    • Fueling Galaxy Growth Through Gas Accretion in Cosmological Simulations 

      Nelson, Dylan (2015-05-17)
      Despite significant advances in the numerical modeling of galaxy formation and evolution, it is clear that a satisfactory theoretical picture of how galaxies acquire their baryons across cosmic time remains elusive. In ...

    • Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence 

      Genel, Shy; Fall, S. Michael; Hernquist, Lars Eric; Vogelsberger, Mark; Snyder, Gregory F.; Rodriguez-Gomez, Vicente; Sijacki, Debora; Springel, Volker (IOP Publishing, 2015)
      We study the stellar angular momentum of thousands of galaxies in the Illustris cosmological simulation, which captures gravitational and gas dynamics within galaxies, as well as feedback from stars and black holes. We ...

    • Galaxy Mergers and Some Consequences: The Cosmological Context 

      Rodriguez-Gomez, Vicente (2016-05-18)
      The last few years have seen enormous progress in the field of galaxy formation and evolution. The latest generation of hydrodynamic cosmological simulations (e.g., the "Illustris" simulation) has been able to produce ...

    • How to distinguish starbursts and quiescently star-forming galaxies: the ‘bimodal’ submillimetre galaxy population as a case study 

      Hayward, Christopher C.; Jonsson, Patrik; Kere?, Du?an; Magnelli, Benjamin; Hernquist, Lars Eric; Cox, T. J. (Oxford University Press (OUP), 2012)
      In recent work, we have suggested that the high-redshift (z∼ 2–4) bright submillimetre galaxy (SMG) population is heterogeneous, with major mergers contributing both at early stages, where quiescently star-forming discs ...

    • Interior Structure and Chemistry of Solid Exoplanets 

      Zeng, Li (2015-05-08)
      Understanding the interior structures and chemistry of Earth-like exoplanets is crucial for us to characterize exoplanets, and to find potentially habitable planets. First, I provide a model grid of the mass-radius ...

    • Mapping galaxy encounters in numerical simulations: the spatial extent of induced star formation 

      Moreno, J.; Torrey, P; Ellison, S. L.; Patton, D. R.; Bluck, A. F. L.; Bansal, G.; Hernquist, Lars Eric (Oxford University Press (OUP), 2015)
      We employ a suite of 75 simulations of galaxies in idealized major mergers (stellar mass ratio ∼2.5:1), with a wide range of orbital parameters, to investigate the spatial extent of interaction-induced star formation. ...

    • The mass profile of the Milky Way to the virial radius from the Illustris simulation 

      Taylor, Corbin; Boylan-Kolchin, Michael; Torrey, Paul; Vogelsberger, Mark; Hernquist, Lars Eric (Oxford University Press (OUP), 2016)
      We use particle data from the Illustris simulation, combined with individual kinematic constraints on the mass of the Milky Way (MW) at specific distances from the Galactic Centre, to infer the radial distribution of the ...

    • Modeling and Simulation of Circumstellar Disks with the Next Generation of Hydrodynamic Solvers 

      Munoz, Diego Jose (2013-10-18)
      This thesis is a computational study of circumstellar gas disks, with a special focus on modeling techniques and on numerical methods not only as scientific tools but also as a target of study. In particular, in-depth ...

    • Modeling Mid-Infrared Diagnostics of Obscured Quasars and Starbursts 

      Snyder, Gregory; Hayward, Christopher C.; Sajina, Anna; Jonsson, Patrik; Cox, Thomas J.; Hernquist, Lars Eric; Hopkins, Philip F.; Yan, Lin (IOP Publishing, 2013)
      We analyze the link between active galactic nuclei (AGNs) and mid-infrared flux using dust radiative transfer calculations of starbursts realized in hydrodynamical simulations. Focusing on the effects of galaxy dust, we ...

    • Modeling Spatially and Spectrally Resolved Observations to Diagnose the Formation of Elliptical Galaxies 

      Snyder, Gregory Frantz (2013-09-30)
      In extragalactic astronomy, a central challenge is that we cannot directly watch what happens to galaxies before and after they are observed. This dissertation focuses on linking predictions of galaxy time-evolution directly ...

    • Modeling the Dust Properties of z ~ 6 Quasars with ART2—All-Wavelength Radiative Transfer with Adaptive Refinement Tree 

      Li, Yuexing; Hopkins, Philip F.; Hernquist, Lars Eric; Finkbeiner, Douglas; Cox, Thomas J.; Springel, Volker; Jiang, Linhua; Fan, Xiaohui; Yoshida, Naoki (IOP Publishing, 2008)
      The detection of large quantities of dust in z ~ 6 quasars by infrared and radio surveys presents puzzles for the formation and evolution of dust in these early systems. Previously, Li et al. showed that luminous quasars ...

    • Modeling the Evolution of Galaxy Properties across Cosmic Time with Numerical Simulations 

      Torrey, Paul A (2014-06-06)
      We present a series of numerical galaxy formation studies which apply new numerical methods to produce increasingly realistic galaxy formation models. We first investigate the metallicity evolution of a large set of ...

    • Modelling galactic conformity with the colour–halo age relation in the Illustris simulation 

      Bray, Aaron; Pillepich, Annalisa; Sales, Laura V.; Zhu, Emily Chengxi; Genel, Shy; Rodriguez-Gomez, Vicente; Torrey, Paul; Nelson, Dylan; Vogelsberger, Mark; Springel, Volker; Eisenstein, Daniel James; Hernquist, Lars Eric (Oxford University Press (OUP), 2015)
      Comparisons between observational surveys and galaxy formation models find that dark matter haloes’ mass can largely explain their galaxies’ stellar mass. However, it remains uncertain whether additional environmental ...

    • Moving mesh cosmology: the hydrodynamics of galaxy formation 

      Sijacki, Debora; Vogelsberger, Mark; Kere?, Du?an; Springel, Volker; Hernquist, Lars Eric (Oxford University Press (OUP), 2012)
      We present a detailed comparison between the well-known smoothed particle hydrodynamics (SPH) code gadget and the new moving-mesh code arepo on a number of hydrodynamical test problems. Through a variety of numerical ...

    • A moving mesh unstaggered constrained transport scheme for magnetohydrodynamics 

      Mocz, Philip; Pakmor, Rüdiger; Springel, Volker; Vogelsberger, Mark; Marinacci, Federico; Hernquist, Lars Eric (Oxford University Press (OUP), 2016)
      We present a constrained transport (CT) algorithm for solving the 3D ideal magnetohydrodynamic (MHD) equations on a moving mesh, which maintains the divergence-free condition on the magnetic field to machine-precision. Our ...

    • On the assembly of dwarf galaxies in clusters and their efficient formation of globular clusters 

      Mistani, Pouria A.; Sales, Laura V.; Pillepich, Annalisa; Sanchez-Janssen, Rubén; Vogelsberger, Mark; Nelson, Dylan; Rodriguez-Gomez, Vicente; Torrey, Paul; Hernquist, Lars Eric (Oxford University Press (OUP), 2015)
      Galaxy clusters contain a large population of low-mass dwarf elliptical galaxies whose exact origin is unclear: their colours, structural properties and kinematics differ substantially from those of dwarf irregulars in the ...

    • Physically Modeling High-Redshift Ultraluminous Infrared Galaxies 

      Hayward, Christopher (2013-01-02)
      We have used a combination of hydrodynamical simulations, dust radiative transfer, and an empirically based analytical model for galaxy number densities and merger rates in order to physically model the bright high-redshift ...