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

    • A high fidelity Milky Way simulation with Kraken, Gaia-Enceladus, and Sequoia analogues: clues to their accretion histories
      Within a simulated Milky Way-like galaxy, we identify and analyse analogues of the Gaia-Enceladus (GE), Kraken, and Sequoia mergers that each matches remarkably well observational results, including in velocity and chemical abundance space, and their distributions in the j z-Energy plane. The Kraken analogue is the earliest merger and has the
      García-Bethencourt, Guacimara et al.

      Fecha de publicación:

      11
      2023
      Número de citas
      7
    • Constraining gas metal mixing strength in simulations using observations of the Milky Way's disc
      This work explores the mixing rate of metals in the interstellar medium (ISM), comparing observational constraints from our solar neighbourhood to high resolution cosmological hydrodynamical simulations of Milky Way (MW)-like galaxies. The mixing rate, described by the coefficient C, is varied in simulations between 0 and 0.05, with resultant
      Sarrato-Alós, J. et al.

      Fecha de publicación:

      10
      2023
      Número de citas
      1
    • Cosmic gas highways in C-EAGLE simulations
      Context. A substantial fraction of cosmic baryons is expected to hide in the form of diffuse warm-hot intergalactic medium (WHIM) at X-ray temperatures (T = 10 5 − 10 7 K). Due to the expected low density of WHIM, it has been very difficult to detect so far. A statistically significant sample of credible detections of the WHIM phase might help
      Vurm, I. et al.

      Fecha de publicación:

      5
      2023
      Número de citas
      9
    • On the anticorrelation between pericentric distance and inner dark matter density of Milky Way's dwarf spheroidal galaxies
      An anticorrelation between the central density of the dark matter (DM) halo (ρ 150, DM) and the pericentric distances (r p) of the Milky Way's (MW's) dwarf spheroidal galaxies (dSphs) has been reported in the literature. The existence and origin of such anticorrelation are, however, controversial, one possibility being that only the densest dSphs
      Cardona-Barrero, Salvador et al.

      Fecha de publicación:

      6
      2023
      Número de citas
      5
    • The Undiscovered Ultradiffuse Galaxies of the Local Group
      Ultradiffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are difficult to detect because of their low surface brightness. In the Local Group a handful of UDGs have been found to date, most of which are satellites of the Milky Way and M31, and only two are
      Newton, Oliver et al.

      Fecha de publicación:

      4
      2023
      Número de citas
      8
    • A probabilistic deep learning model to distinguish cusps and cores in dwarf galaxies
      Numerical simulations within a cold dark matter (DM) cosmology form haloes whose density profiles have a steep inner slope ('cusp'), yet observations of galaxies often point towards a flat central 'core'. We develop a convolutional mixture density neural network model to derive a probability density function (PDF) of the inner density slopes of DM
      Expósito-Márquez, J. et al.

      Fecha de publicación:

      3
      2023
      Número de citas
      3
    • A probabilistic deep learning model to distinguish cusps and cores in dwarf galaxies
      Numerical simulations within a cold dark matter (DM) cosmology form halos whose density profiles have a steep inner slope (‘cusp’), yet observations of galaxies often point towards a flat central ‘core’. We develop a convolutional mixture density neural network model to derive a probability density function (PDF) of the inner density slopes of DM

      Fecha de publicación:

      12
      2022
    • Metallicity profiles of ultradiffuse galaxies in NIHAO simulations
      Supernovae feedback driven expansion has proven to be a viable mechanism to explain the average properties, such as size, colour, mass, and internal kinematics, of a large fraction of ultradiffuse galaxies (UDGs). Here, we explore the origin of stellar metallicity gradients in feedback driven simulated UDGs from the NIHAO project and compare them
      Cardona-Barrero, S. et al.

      Fecha de publicación:

      2
      2023
      Número de citas
      6
    • Linking the internal properties of infant globular clusters to their formation environments
      We investigate the formation of infant globular cluster (GC) candidates in high-resolution cosmological simulations from the First Billion Years project. By analysing the evolution of the systems in the energy and angular momentum plane, we identify the redshift at which the infant GCs first became gravitationally bound, and we find evidence of
      Phipps, Frederika et al.

      Fecha de publicación:

      1
      2023
      Número de citas
      1
    • Mesh-free hydrodynamics in PKDGRAV3 for galaxy formation simulations
      We extend the state-of-the-art N-body code PKDGRAV3 with the inclusion of mesh-free gas hydrodynamics for cosmological simulations. Two new hydrodynamic solvers have been implemented, the mesh-less finite volume and mesh-less finite mass methods. The solvers manifestly conserve mass, momentum, and energy, and have been validated with a wide range
      Alonso Asensio, Isaac et al.

      Fecha de publicación:

      2
      2023
      Número de citas
      5
    • The luminosity of cluster galaxies in the Cluster-EAGLE simulations
      We computed the luminosity of simulated galaxies of the C-EAGLE project, a suite of 30 high-resolution zoom-in simulations of galaxy clusters based on the EAGLE simulation. The AB magnitudes are derived for different spectral bands, from ultraviolet to infrared, using the simple stellar population modelling based on the E-MILES stellar spectra
      Negri, Andrea et al.

      Fecha de publicación:

      9
      2022
      Número de citas
      5
    • NIHAO-LG: the uniqueness of Local Group dwarf galaxies
      Recent observational and theoretical studies of the Local Group (LG) dwarf galaxies have highlighted their unique star-formation history, stellar metallicity, gas content, and kinematics. We investigate the commonality of these features by comparing constrained LG and field central dwarf halo simulations in the Numerical Investigation of a Hundred
      Arora, Nikhil et al.

      Fecha de publicación:

      6
      2022
      Número de citas
      11
    • Observed versus simulated halo c-M<SUB>vir</SUB> relations
      The concentration - virial mass relation is a well-defined trend that reflects the formation of structure in an expanding universe. Numerical simulations reveal a marked correlation that depends on the collapse time of dark matter haloes and their subsequent assembly history. However, observational constraints are mostly limited to the massive end

      Fecha de publicación:

      2
      2022
    • FOREVER22: galaxy formation in protocluster regions
      We present results from a new cosmological hydrodynamics simulation campaign of protocluster (PC) regions, FOREVER22: FORmation and EVolution of galaxies in Extremely overdense Regions motivated by SSA22. The simulations cover a wide range of cosmological scales using three different zoom set-ups in a parent volume of $(714.2~\rm cMpc)^{3}$: PCR
      Yajima, Hidenobu et al.

      Fecha de publicación:

      1
      2022
      Número de citas
      35
    • Formation of the first galaxies in the aftermath of the first supernovae
      We perform high-resolution cosmological hydrodynamic simulations to study the formation of the first galaxies that reach the masses of 10 8 - 9 h -1 M ⊙ at z = 9. The resolution of the simulations is high enough to resolve minihaloes and allow us to successfully pursue the formation of multiple Population (Pop) III stars, their supernova (SN)
      Abe, Makito et al.

      Fecha de publicación:

      12
      2021
      Número de citas
      24
    • A Shallow Dark Matter Halo in Ultra-diffuse Galaxy AGC 242019: Are UDGs Structurally Similar to Low-surface-brightness Galaxies?
      A central question regarding ultra-diffuse galaxies (UDGs) is whether they are in a separate category from low-surface-brightness (LSB) galaxies, or just their natural continuation toward low stellar masses. In this Letter, we show that the rotation curve of the gas rich UDG AGC 242019 is well fit by a dark matter halo with an inner slope that
      Brook, Chris B. et al.

      Fecha de publicación:

      9
      2021
      Número de citas
      13
    • Pericentric passage-driven star formation in satellite galaxies and their hosts: CLUES from local group simulations
      Local Group satellite galaxies show a wide diversity of star formation histories (SFHs) whose origin is yet to be fully understood. Using hydrodynamical simulations from the Constrained Local UniversE project, we study the SFHs of satellites of Milky Way-like galaxies in a cosmological context: while in the majority of the cases the accretion on to
      Di Cintio, Arianna et al.

      Fecha de publicación:

      9
      2021
      Número de citas
      35
    • Origin of stellar prolate rotation in a cosmologically simulated faint dwarf galaxy
      Stellar prolate rotation in dwarf galaxies is rather uncommon, with only two known galaxies in the Local Group showing such feature (Phoenix and And II). Cosmological simulations show that in massive early-type galaxies prolate rotation likely arises from major mergers. However, the origin of such kinematics in the dwarf galaxies regime has only
      Cardona-Barrero, Salvador et al.

      Fecha de publicación:

      7
      2021
      Número de citas
      9
    • History of the gas fuelling star formation in EAGLE galaxies
      Theory predicts that cosmological gas accretion plays a fundamental role fuelling star formation in galaxies. However, a detailed description of the accretion process to be used when interpreting observations is still lacking. Using the state-of-the-art cosmological hydrodynamical simulation EAGLE, we work out the chemical inhomogeneities arising
      Scholz-Díaz, Laura et al.

      Fecha de publicación:

      8
      2021
      Número de citas
      9
    • Higher order Hamiltonian Monte Carlo sampling for cosmological large-scale structure analysis
      We investigate higher order symplectic integration strategies within Bayesian cosmic density field reconstruction methods. In particular, we study the fourth-order discretization of Hamiltonian equations of motion (EoM). This is achieved by recursively applying the basic second-order leap-frog scheme (considering the single evaluation of the EoM)
      Hernández-Sánchez, Mónica et al.

      Fecha de publicación:

      4
      2021
      Número de citas
      8

    Charlas relacionadas

    No se han encontrado charlas relacionadas.

    Congresos relacionados

    No se han encontrado congresos relacionados.