Astrofísica Numérica: Formación y Evolución de Galaxias

    General
    Descripción

    Entre las cuestiones fundamentales en Astronomía y Astrofísica están la formación y evolución de galaxias. Las escalas de tiempo y tamaño son tan astronómicas que su observación en galaxias individuales es imposible. Solo con el uso de simulaciones numéricas es posible entender la formación de estructuras cósmicas dentro del actual marco cosmológico.

    Los principales procesos físicos que rigen la formación y evolución de galaxias son gravedad, hidrodinámica, gas cooling, formación estelar, evolución estelar, y SN y BH feedback, todos ellos no lineales y por ello difíciles de describir con modelos puramente analíticos. Otros modelos, los semi-analíticos, se basan en simulaciones de únicamente materia oscura y están, por tanto, sesgados al igual que éstas. Por todo esto, las simulaciones cosmológicas hidrodinámicas son la mejor herramienta para realizar los “experimentos controlados” de formación y evolución de galaxias.

    Tras tres décadas de mejoras en las simulaciones numéricas, solo ahora los trabajos teóricos pueden reproducir simultáneamente las propiedades observadas de las galaxias y del medio interestelar (e.g. EAGLE, Schaye et al. 2015, MNRAS, 446, 521; ILLUSTRIS, Vogelsberger et al., 2014, Nature, 509, 177); en particular, las funciones de luminosidad y de masa de las galaxias, las relaciones entre tamaño y masa, entre metalicidad y masa, entre otras muchas propiedades están reproducidas en un amplio rango de masas de galaxias.

    El grupo de astrofísica numérica trabaja en una variedad de temas científicos relacionados con la evolución de las galaxias y la estructura a gran escala del universo. La experiencia abarca desde la estructura interna de las galaxias enanas y de bajo brillo superficial, la Vía Láctea y sus galaxias satélite, el estudio de las galaxias en grupos y agrupaciones, hasta las grandes simulaciones cosmológicas de la estructura del universo. El grupo colabora con la mayoría de los grupos de investigación de IAC que trabajan en astrofísica extragaláctica y cosmología.

    Investigador principal
    Co investigador principal

    Publicaciones relacionadas

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      We present results from a subset of simulations from the `Evolution and Assembly of GaLaxies and their Environments' (EAGLE) suite in which the formulation of the hydrodynamics scheme is varied. We compare simulations that use the same subgrid models without recalibration of the parameters but employing the standard GADGET flavour of smoothed
      Schaller, M. et al.

      Fecha de publicación:

      12
      2015
      Número de citas
      209
    • The BaLROG project - I. Quantifying the influence of bars on the kinematics of nearby galaxies
      We present the BaLROG (Bars in Low Redshift Optical Galaxies) sample of 16 morphologically distinct barred spirals to characterize observationally the influence of bars on nearby galaxies. Each galaxy is a mosaic of several pointings observed with the integral-field unit (IFU) SAURON leading to a tenfold sharper spatial resolution (˜100 pc)
      Seidel, M. K. et al.

      Fecha de publicación:

      7
      2015
      Número de citas
      36
    • Hα kinematics of S4G spiral galaxies - II. Data description and non-circular motions
      We present a kinematical study of 29 spiral galaxies included in the Spitzer Survey of Stellar Structure in Galaxies, using Hα Fabry-Perot (FP) data obtained with the Galaxy Hα Fabry-Perot System instrument at the William Herschel Telescope in La Palma, complemented with images in the R band and in Hα. The primary goal is to study the evolution and
      Erroz-Ferrer, S. et al.

      Fecha de publicación:

      7
      2015
      Número de citas
      29
    • Colours and luminosities of z = 0.1 galaxies in the EAGLE simulation
      We calculate the colours and luminosities of redshift z = 0.1 galaxies from the EAGLE simulation suite using the GALAXEV population synthesis models. We take into account obscuration by dust in birth clouds and diffuse interstellar medium using a two-component screen model, following the prescription of Charlot and Fall. We compare models in which
      Trayford, J. W. et al.

      Fecha de publicación:

      9
      2015
      Número de citas
      212
    • Molecular hydrogen abundances of galaxies in the EAGLE simulations
      We investigate the abundance of galactic molecular hydrogen (H2) in the `Evolution and Assembly of GaLaxies and their Environments' (EAGLE) cosmological hydrodynamic simulations. We assign H2 masses to gas particles in the simulations in post-processing using two different prescriptions that depend on the local dust-to-gas ratio and the
      Lagos, C. P. et al.

      Fecha de publicación:

      10
      2015
      Número de citas
      192
    • The alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE and cosmo-OWLS simulations
      We report the alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE (Evolution and Assembly of GaLaxies and their Environments) and cosmo-OWLS (OverWhelmingly Large Simulations) simulations. The combination of these state-of-the-art hydrodynamical cosmological simulations enables us to span four orders of magnitude in
      Theuns, Tom et al.

      Fecha de publicación:

      10
      2015
      Número de citas
      121
    • The effect of baryons on the inner density profiles of rich clusters
      We use the `Evolution and assembly of galaxies and their environments' (EAGLE) cosmological simulation to investigate the effect of baryons on the density profiles of rich galaxy clusters. We focus on EAGLE clusters with M200 > 1014 M⊙ of which we have six examples. The central brightest cluster galaxies (BCGs) in the simulation have steep stellar
      McCarthy, I. G. et al.

      Fecha de publicación:

      9
      2015
      Número de citas
      92
    • Baryon effects on the internal structure of ΛCDM haloes in the EAGLE simulations
      We investigate the internal structure and density profiles of haloes of mass 1010-1014 M⊙ in the Evolution and Assembly of Galaxies and their Environment (EAGLE) simulations. These follow the formation of galaxies in a Λ cold dark matter Universe and include a treatment of the baryon physics thought to be relevant. The EAGLE simulations reproduce
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      Fecha de publicación:

      8
      2015
      Número de citas
      341
    • Spatially adaptive radiation-hydrodynamical simulations of galaxy formation during cosmological reionization
      We present a suite of cosmological radiation-hydrodynamical simulations of the assembly of galaxies driving the reionization of the intergalactic medium (IGM) at z ≳ 6. The simulations account for the hydrodynamical feedback from photoionization heating and the explosion of massive stars as supernovae (SNe). Our reference simulation, which was
      Pawlik, A. H. et al.

      Fecha de publicación:

      8
      2015
      Número de citas
      62
    • The First Billion Years project: the escape fraction of ionizing photons in the epoch of reionization
      Protogalaxies forming in low-mass dark matter haloes are thought to provide the majority of ionizing photons needed to reionize the Universe, due to their high escape fractions of ionizing photons. We study how the escape fraction in high-redshift galaxies relates to the physical properties of the halo in which the galaxies form, by computing
      Paardekooper, J.-P. et al.

      Fecha de publicación:

      8
      2015
      Número de citas
      196
    • Evolution of galaxy stellar masses and star formation rates in the EAGLE simulations
      We investigate the evolution of galaxy masses and star formation rates in the Evolution and Assembly of Galaxies and their Environment (EAGLE) simulations. These comprise a suite of hydrodynamical simulations in a Λ cold dark matter cosmogony with subgrid models for radiative cooling, star formation, stellar mass-loss and feedback from stars and
      Furlong, M. et al.

      Fecha de publicación:

      7
      2015
      Número de citas
      367
    • On the morphology of dust lanes in galactic bars
      The aim of our study is to use dynamical simulations to explore the influence of two important dynamical bar parameters, bar strength and bar pattern speed on the shape of the bar dust lanes. To quantify the shape of the dust lanes we have developed a new systematic method to measure the dust lane curvature. Previous numerical simulations have
      Sánchez-Menguiano, L. et al.

      Fecha de publicación:

      7
      2015
      Número de citas
      12
    • The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
      We present results from 13 cosmological simulations that explore the parameter space of the `Evolution and Assembly of GaLaxies and their Environments' (EAGLE) simulation project. Four of the simulations follow the evolution of a periodic cube L = 50 cMpc on a side, and each employs a different subgrid model of the energetic feedback associated
      Crain, R. A. et al.

      Fecha de publicación:

      6
      2015
      Número de citas
      1000
    • A cosmological context for compact massive galaxies
      To provide a quantitative cosmological context to ongoing observational work on the formation histories and location of compact massive galaxies, we locate and study a sample of exceptionally compact systems in the BOLSHOI simulation, using the dark matter structural parameters from a real, compact massive galaxy (NGC 1277) as a basis for our
      Stringer, M. et al.

      Fecha de publicación:

      5
      2015
      Número de citas
      28
    • Bent by baryons: the low-mass galaxy-halo relation
      The relation between galaxies and dark matter haloes is of vital importance for evaluating theoretical predictions of structure formation and galaxy formation physics. We use hydrodynamic cosmological simulations of the Local Group to show that the widely used method of abundance matching based on dark matter only simulations fails at the low-mass
      Sawala, T. et al.

      Fecha de publicación:

      4
      2015
      Número de citas
      193
    • Made-to-measure models of the Galactic box/peanut bulge: stellar and total mass in the bulge region
      We construct dynamical models of the Milky Way's box/peanut (B/P) bulge, using the recently measured 3D density of red clump giants (RCGs) as well as kinematic data from the Bulge Radial Velocity Assay (BRAVA) survey. We match these data using the NMAGIC made-to-measure method, starting with N-body models for barred discs in different dark matter
      Portail, M. et al.

      Fecha de publicación:

      3
      2015
      Número de citas
      157
    • The EAGLE project: simulating the evolution and assembly of galaxies and their environments
      We introduce the Virgo Consortium's Evolution and Assembly of GaLaxies and their Environments (EAGLE) project, a suite of hydrodynamical simulations that follow the formation of galaxies and supermassive black holes in cosmologically representative volumes of a standard Λ cold dark matter universe. We discuss the limitations of such simulations in
      Schaye, J. et al.

      Fecha de publicación:

      1
      2015
      Número de citas
      1000
    • The First Billion Years project: gamma-ray bursts at z > 5
      Long gamma-ray burst's (LGRB's) association with the death of massive stars suggests that they could be used to probe the cosmic star formation history (CSFH) with high accuracy, due to their high luminosities. We utilize cosmological simulations from the First Billion Years project to investigate the biases between the CSFH and the LGRB rate at z
      Elliott, J. et al.

      Fecha de publicación:

      2
      2015
      Número de citas
      15

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