Evolución de Galaxias en Cúmulos

Año de inicio
2004
Unidad organizativa

Subvenciones relacionadas:

    General
    Descripción

    Las estructuras en el Universo, a todas las escalas de masa, se han formado de una forma jerárquica y principalmente producidas por fusiones de galaxias. Sin embargo, esta formación jerárquica de las galaxias está modulada por el entorno en el cual se crean y evolucionan. Mientras que las galaxias de campo presentan una evolución pasiva, los cúmulos de galaxias son entornos de muy alta densidad donde las galaxias interaccionan unas con otras y con el gas intracumular caliente (ICM). Además, la dinámica de los cúmulos está dominada por la alta densidad y cantidad de materia oscura presente en los mismos y que provoca elevados potenciales gravitatorios. Por todo ello, los cúmulos de galaxias son sistemas complejos con múltiples componentes (galaxias, ICM, materia oscura) que evolucionan de manera acoplada. La mezcla de todas estas componentes, así como sus interacciones, hacen de los cúmulos de galaxias laboratorios ideales donde estudiar una gran variedad de mecanismos que provocan que la evolución de galaxias en estos entornos de alta densidad sea muy diferente a la de las galaxias de campo.

    El objetivo de este proyecto es estudiar la formación y evolución de las galaxias en estos entornos densos. Se pretende entender en que entorno domina cada uno de los mecanismos de transformación de galaxias propuestos por las simulaciones numéricas y como se produce la evolución de los diferentes tipos de galaxias (tanto brillantes como enanas) en los cúmulos. Cuantificar observacionalmente la eficiencia de estos mecanismos no es una tarea sencilla ya que se conoce que muchos de ellos actúan a la vez, lo hacen en escalas de tiempo muy diferentes, y en regiones del cúmulo también diversas. Sin embargo, hay una serie de evidencias observacionales que pueden ser directamente contrastadas: i) distribución morfológica y estructural de las galaxias de los cúmulos; ii) función de luminosidad de galaxias en cúmulos; iii) luz difusa (cantidad y distribución); iv) presencia de subestructuras galácticas dentro de los cúmulos; v) propiedades espectro-fotométricas de las galaxias enanas y brillantes; vi) propiedades del ICM. Todos estos observables proporcionan la información necesaria para entender la relación entre entorno y evolución galáctica. Estas son las cantidades que se mediran en este proyecto para muestras amplias de cúmulos de galaxias.

    Investigador principal
    Personal del proyecto
    1. Forma Intrínseca de las Barras Galácticas. Se encontró, por primera vez, que el 52% (16%) de los bulbos son más gruesos (más planos) que la barra circundante. Se sugiere que estos porcentajes podrían ser representativos de la fracción de bulbos clásicas y tipo disco en nuestra muestra, respectivamente.
    2. La Influencia del Medio Ambiente en la Parada de la Formación de Estelar. Nuestros resultados indican que en entornos de baja densidad, las galaxias post-starburst se forman por fusiones menores ricas en gas, mientras que en entornos de alta densidad, las PSB se producirían al eliminar los depósitos de gas de las galaxias de líneas de emisión por presión de arrastre.
    3. Propiedades Morfo-Cinemáticas de los Bulbos Galácticos. Se encontró que los diagnósticos fotométricos para separar diferentes tipos de bulbos (tipo disco vs clásico) podrían no ser útiles para galaxias S0. Usando las propiedades morfo-cinemáticas de los bulbos en S0, se sugiere que estos se forman principalmente por procesos disipativos a alto redshift.

    Publicaciones relacionadas

    • Composite bulges - II. Classical bulges and nuclear discs in barred galaxies: the contrasting cases of NGC 4608 and NGC 4643
      We present detailed morphological, photometric, and stellar-kinematic analyses of the central regions of two massive, early-type barred galaxies with nearly identical large-scale morphologies. Both have large, strong bars with prominent inner photometric excesses that we associate with boxy/peanut-shaped (B/P) bulges; the latter constitute ∼30 per
      Erwin, Peter et al.

      Fecha de publicación:

      4
      2021
      Número de citas
      18
    • Galaxies within galaxies in the TIMER survey: stellar populations of inner bars are scaled replicas of main bars
      Inner bars are frequent structures in the local Universe and thought to substantially influence the nuclear regions of disc galaxies. In this study we explore the structure and dynamics of inner bars by deriving maps and radial profiles of their mean stellar population content and comparing them to previous findings in the context of main bars. To
      Bittner, Adrian et al.

      Fecha de publicación:

      2
      2021
      Número de citas
      10
    • New Observations with Gemini and GTC of the VHE Blazar KUV 00311-1938: About Its Redshift and Environment
      Extragalactic very-high-energy (VHE; E > 100 GeV) sources are unique objects to study the most powerful particle accelerators in nature, as active galactic nuclei are likely sources of ultra-high-energy cosmic rays. BL Lacertae blazars are the most frequent extragalactic objects found in the VHE gamma-ray catalogs. It is very difficult to estimate
      Pichel, A. et al.

      Fecha de publicación:

      1
      2021
      Número de citas
      2
    • The kinematics of young and old stellar populations in nuclear rings of MUSE TIMER galaxies
      Context. Studying the stellar kinematics of galaxies is a key tool in the reconstruction of their evolution. However, the current measurements of the stellar kinematics are complicated by several factors, including dust extinction and the presence of multiple stellar populations. Aims: We use integral field spectroscopic data of four galaxies from
      Rosado-Belza, D. et al.

      Fecha de publicación:

      12
      2020
      Número de citas
      7
    • Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey
      The centres of disc galaxies host a variety of structures built via both internal and external processes. In this study, we constrain the formation and evolution of these central structures, in particular, nuclear rings and nuclear discs, by deriving maps of mean stellar ages, metallicities, and [α/Fe] abundances. We use observations obtained with
      Bittner, Adrian et al.

      Fecha de publicación:

      11
      2020
      Número de citas
      51
    • Kinematic signatures of nuclear discs and bar-driven secular evolution in nearby galaxies of the MUSE TIMER project
      The central regions of disc galaxies hold clues to the processes that dominate their formation and evolution. To exploit this, the TIMER project has obtained high signal-to-noise and spatial resolution integral-field spectroscopy data of the inner few kpc of 21 nearby massive barred galaxies, which allows studies of the stellar kinematics in their
      Gadotti, Dimitri A. et al.

      Fecha de publicación:

      11
      2020
      Número de citas
      65
    • Relations among structural parameters in barred galaxies with a direct measurement of bar pattern speed
      We investigate the relations between the properties of bars and their host galaxies in a sample of 77 nearby barred galaxies, spanning a wide range of morphological types and luminosities, with 34 SB0-SBa and 43 SBab-SBc galaxies. The sample includes all the galaxies with reliable direct measurement of their bar pattern speed based on long-slit or
      Cuomo, V. et al.

      Fecha de publicación:

      9
      2020
      Número de citas
      28
    • Stellar populations across galaxy bars in the MUSE TIMER project
      Stellar populations in barred galaxies save an imprint of the influence of the bar on the host galaxy's evolution. We present a detailed analysis of star formation histories (SFHs) and chemical enrichment of stellar populations in nine nearby barred galaxies from the TIMER project. We used integral field observations with the MUSE instrument to
      Neumann, Justus et al.

      Fecha de publicación:

      5
      2020
      Número de citas
      34
    • Deep spectroscopy in nearby galaxy clusters - V. The Perseus cluster
      Dwarfs are the largest population of galaxies in number in the nearby Universe. Deep spectroscopic data are still missing to obtain a better understanding of their formation and evolution processes. This study shows the results obtained from a spectroscopic campaign in the Perseus cluster. We have obtained 963 new galaxy spectra. We have measured
      Aguerri, J. A. L. et al.

      Fecha de publicación:

      3
      2020
      Número de citas
      16
    • Deconstructing double-barred galaxies in 2D and 3D - II. Two distinct groups of inner bars
      The intrinsic photometric properties of inner and outer stellar bars within 17 double-barred galaxies are thoroughly studied through a photometric analysis consisting of (i) two-dimensional (2D) multicomponent photometric decompositions, and (ii) three-dimensional (3D) statistical deprojections for measuring the thickening of bars, thus retrieving
      de Lorenzo-Cáceres, A. et al.

      Fecha de publicación:

      3
      2020
      Número de citas
      10
    • Trojans in the Solar Neighborhood
      About 20% of stars in the solar vicinity are in the Hercules stream, a bundle of stars that move together with a velocity distinct from the Sun. Its origin is still uncertain. Here, we explore the possibility that Hercules is made of trojans, stars captured at L4, one of the Lagrangian points of the stellar bar. Using GALAKOS─a high-resolution N
      D'Onghia, Elena et al.

      Fecha de publicación:

      2
      2020
      Número de citas
      32
    • Dynamical Structure of Small Bulges Reveals Their Early Formation in ΛCDM Paradigm
      The Λ cold dark matter (ΛCDM) paradigm of galaxy formation predicts that dense spheroidal stellar structures invariably grow at early cosmic time. These primordial spheroids evolve toward a virialized dynamical status as they finally become today's elliptical galaxies and large bulges at the center of disk galaxies. However, observations reveal
      Costantin, Luca et al.

      Fecha de publicación:

      1
      2020
      Número de citas
      12
    • SDSS-IV MaNGA: bar pattern speed estimates with the Tremaine-Weinberg method and their error sources
      Estimating the bar pattern speed (Ω bar) is one of the main challenges faced in understanding the role of stellar bars in galaxy dynamical evolution. This work aims to characterize different uncertainty sources affecting the Tremaine-Weinberg (TW) method to study the correlation between bar and galaxies physical parameters. We use a sample of 15
      Garma-Oehmichen, L. et al.

      Fecha de publicación:

      1
      2020
      Número de citas
      28
    • Using HARPS-N to characterize the long-period planets in the PH-2 and Kepler-103 systems
      We present confirmation of the planetary nature of PH-2b, as well as the first mass estimates for the two planets in the Kepler-103 system. PH-2b and Kepler-103c are both long-period and transiting, a sparsely populated category of exoplanets. We use Kepler light-curve data to estimate a radius, and then use HARPS-N radial velocities to determine
      Dubber, Sophie C. et al.

      Fecha de publicación:

      12
      2019
      Número de citas
      11
    • Growth and disruption in the Lyra complex
      Context. Nearby clusters of galaxies, z ≲ 0.1, are cosmic structures still under formation. Understanding the thermodynamic properties of merging clusters can provide crucial information on how they grow in the local universe. Aims: A detailed study of the intra-cluster medium (ICM) properties of un-relaxed systems is essential to understand the
      Clavico, S. et al.

      Fecha de publicación:

      12
      2019
      Número de citas
      8
    • Fossil group origins. X. Velocity segregation in fossil systems
      Aims: We aim to study how the velocity segregation and the radial profile of the velocity dispersion depend on the prominence of the brightest cluster galaxies (BCGs). Methods: We divided a sample of 102 clusters and groups of galaxies into four bins of magnitude gap between the two brightest cluster members. We then computed the velocity
      Zarattini, S. et al.

      Fecha de publicación:

      11
      2019
      Número de citas
      3
    • Bar pattern speeds in CALIFA galaxies. II. The case of weakly barred galaxies
      Context. About 35% of the nearby disc galaxies host a weak bar for which different formation scenarios, including the weakening of a strong bar and tidal interaction with a companion, have been suggested. Measuring the bar pattern speeds of a sample of weakly barred galaxies is a key step in constraining their formation process, but such a
      Cuomo, Virginia et al.

      Fecha de publicación:

      12
      2019
      Número de citas
      36
    • Stellar populations of galaxies in the ALHAMBRA survey up to z ̃ 1. III. The stellar content of the quiescent galaxy population during the last 8 Gyr
      Aims: We aim at constraining the stellar population properties of quiescent galaxies. These properties reveal how these galaxies evolved and assembled since z ̃ 1 up to the present time. Methods: Combining the ALHAMBRA multi-filter photo-spectra with the fitting code for spectral energy distribution MUFFIT (MUlti-Filter FITting), we built a
      Díaz-García, L. A. et al.

      Fecha de publicación:

      11
      2019
      Número de citas
      12
    • The CALIFA view on stellar angular momentum across the Hubble sequence
      We present the apparent stellar angular momentum over the optical extent of 300 galaxies across the Hubble sequence using integral-field spectroscopic (IFS) data from the CALIFA survey. Adopting the same λ R parameter previously used to distinguish between slow and fast rotating early-type (elliptical and lenticular) galaxies, we show that spiral
      Falcón-Barroso, J. et al.

      Fecha de publicación:

      12
      2019
      Número de citas
      44
    • Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017
      We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013-2017. We use radio-to-optical data obtained by the Whole Earth Blazar Telescope, 15 GHz data from the Owens Valley Radio Observatory, 91 and 103 GHz data from the Atacama Large Millimeter Array, near-infrared data from the Rapid Eye Monitor telescope, as well
      D'Ammando, F. et al.

      Fecha de publicación:

      12
      2019
      Número de citas
      18

    Charlas relacionadas

    No se han encontrado charlas relacionadas.

    Congresos relacionados

    No se han encontrado congresos relacionados.