Vía Láctea y galaxias cercanas

Año de inicio
1994
Año fin
2021
Unidad organizativa
    General
    Descripción

    El objetivo general del Proyecto es el estudio de la estructura, historia evolutiva y proceso de formación de galaxias a través de sus poblaciones estelares resueltas, tanto a partir de fotometría como espectroscopia. El proyecto puede dividirse en cuatro líneas principales:

    I. Historia de formación estelar en el Grupo Local.

    El objetivo de esta línea es la caracterización de la estructura espacio-temporal de las galaxias del Grupo Local mediante la observación de sus estrellas individuales. Un objetivo fundamental es la determinación de las historias de la formación estelar (HFE) detalladas y extendidas a toda la historia evolutiva de la galaxia con objeto de determinar el grado de importancia que los procesos cosmológicos (tales como la reionización o self-shielding) o locales (barrido de gas por supernovas, fuerzas de marea, migración estelar) tuvieron en su formación.

    II. Multipoblaciones estelares en cúmulos globulares.

    De forma contraria al paradigma clásico, hay evidencias de que los cúmulos globulares (CG) albergan más de una población estelar de diferente composición química. Observaciones fotométricas de los CG usando el HST muestran fuertes evidencias de múltiples secuencias principales en el DCM. El objetivo de la línea es caracterizar dichas multipoblaciones en CG.

    III. Formación y estructura de la Vía Láctea.

    Esta línea tiene como eje principal el estudio de la Vía Láctea a través de los datos que proporcionará GAIA (espacio) y el survey ESO-VVV . Este tipo de datos van a dar una oportunidad única de conocer la historia de formación estelar en el disco y en el bulbo galáctico. En este marco, es necesario adecuar las herramientas desarrolladas por nuestro grupo para el análisis de poblaciones estelares al tipo de datos que está suministrando ambos surveys.

    IV. Evolución estelar y diagrama color-magnitud sintético.

    Nuestro grupo ha liderado el desarrollo de una nueva librería de evolución estelar. Hay una necesidad en la comunidad científica de mejorar la confianza y exactitud de la computación de modelos estelares mediante la incorporación de las últimas mejoras en el campo de la física tales como la Ecuación de Estado, nuevos cálculos en tablas de opacidades o en secciones nucleares effectivas.

    1. Desarrollo de la web http://basti-iac.oa-teramo.inaf.it de la librería BaSTI
    2. Obtención de fotometría PSF en el IR próximo de la región completa del disco galáctico procedente de VVV (220 grados cuadrados entre 294.7° ≤ l ≤ 350.0° y |b| ≤ 2.25°) en J y K
    3. Elaboración de una base de datos completa de "mapas cromosómicos", de acceso público, para todos los objetos del "HST Legacy Project on Globular Clusters".
    4. Determinación de las Historias de Formación Estelar de tres galaxias ultra-débiles (UFD): Bootes I, Canes Venatici II y Leo IV

    Publicaciones relacionadas

    • Internal rotation of Milky Way dwarf spheroidal satellites with Gaia Early Data Release 3

      We present an analysis of the kinematics of 14 satellites of the Milky Way (MW). We use proper motions (PMs) from the Gaia Early Data Release 3 (EDR3) and line-of-sight velocities (vlos) available in the literature to derive the systemic 3D motion of these systems. For six of them, namely the Carina, Draco, Fornax, Sculptor, Sextans, and Ursa Minor

      Martínez-García, Alberto Manuel et al.

      Fecha de publicación:

      8
      2021
    • Constraining the solar neighbourhood age-metallicity relation from white dwarf-main sequence binaries

      The age-metallicity relation (AMR) is a fundamental tool for constraining the chemical evolution of the Galactic disc. In this work, we analyse the observational properties of this relation using binary stars that have not interacted consisting of a white dwarf (WD) - from which we can derive the total age of the system - and a main sequence (MS)

      Rebassa-Mansergas, A. et al.

      Fecha de publicación:

      8
      2021
    • Exploring nine simultaneously occurring transients on April 12th 1950

      Nine point sources appeared within half an hour on a region within ∼? 10 arcmin of a red-sensitive photographic plate taken in April 1950 as part of the historic Palomar Sky Survey. All nine sources are absent on both previous and later photographic images, and absent in modern surveys with CCD detectors which go several magnitudes deeper. We

      Villarroel, Beatriz et al.

      Fecha de publicación:

      0
      2021
    • The Cluster HEritage project with XMM-Newton: Mass Assembly and Thermodynamics at the Endpoint of structure formation. I. Programme overview

      The Cluster HEritage project with XMM-Newton - Mass Assembly and Thermodynamics at the Endpoint of structure formation (CHEX-MATE) is a three-mega-second Multi-Year Heritage Programme to obtain X-ray observations of a minimally-biased, signal-to-noise-limited sample of 118 galaxy clusters detected by Planck through the Sunyaev-Zeldovich effect. The

      CHEX-MATE Collaboration et al.

      Fecha de publicación:

      6
      2021
    • Interactions between large-scale radio structures and gas in a sample of optically selected type 2 quasars

      Context. The role of radio mode feedback in non radio-loud quasars needs to be explored in depth to determine its true importance. Its effects can be identified based on the evidence of interactions between the radio structures and the ambient ionised gas. Aims: We investigate this interaction in a sample of 13 optically selected type 2 quasars

      Villar Martín, M. et al.

      Fecha de publicación:

      6
      2021
    • A Case against a Significant Detection of Precession in the Galactic Warp

      Recent studies of warp kinematics using Gaia DR2 data have produced detections of warp precession for the first time, which greatly exceeds theoretical predictions of models. However, this detection assumes a warp model derived for a young population (few tens of megayears) to fit velocities of an average older stellar population of the thin disk

      Chrobáková, Ž. et al.

      Fecha de publicación:

      5
      2021
    • Exact Semianalytical Calculation of Rotation Curves with Bekenstein-Milgrom Nonrelativistic MOND

      Astronomers derive MOdified Newtonian Dynamics (MOND) rotation curves using the simple algebraic rule of calculating the acceleration as equal to the Newtonian acceleration (a) divided by some factor μ(a). However, there are velocity differences between this simple rule and the calculation derived from more sophisticated MOND versions such as AQUAL

      López-Corredoira, M. et al.

      Fecha de publicación:

      3
      2021
    • Multiple Populations in Low-mass Globular Clusters: Palomar 13

      Since the discovery of chemically peculiar stars in globular clusters in the last century, the study of multiple populations has become increasingly important, given that chemical inhomogeneity is found in almost all globular clusters. Despite various proposed theories attempting to explain this phenomenon, fitting all the observational evidence in

      Tang, Baitian et al.

      Fecha de publicación:

      2
      2021
    • Updated BaSTI Stellar Evolution Models and Isochrones. II. α-enhanced Calculations

      This is the second paper of a series devoted to presenting an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library. Following the publication of the updated solar-scaled library, here we present the library for an α-enhanced heavy element distribution. These new α-enhanced models account for all

      Pietrinferni, Adriano et al.

      Fecha de publicación:

      2
      2021
    • PSR B0656+14: the unified outlook from the infrared to X-rays

      We report detection of PSR B0656+14 with the Gran Telescopio Canarias in narrow optical F657, F754, F802, and F902 and near-infrared JHKs bands. The pulsar detection in the Ks band extends its spectrum to 2.2 $\mu$ m and confirms its flux increase towards the infrared. We also present a thorough analysis of the optical spectrum obtained by us with

      Zharikov, S. et al.

      Fecha de publicación:

      4
      2021
    • HST Survey of the Orion Nebula Cluster in the H<SUB>2</SUB>O 1.4 μm Absorption Band. III. The Population of Substellar Binary Companions

      We present new results concerning the substellar binary population in the Orion Nebula Cluster (ONC). Using the Karhunen-Loève Image Projection algorithm, we have reprocessed images taken with the IR channel of the Wide Field Camera 3 mounted on the Hubble Space Telescope to unveil faint, close companions in the wings of the stellar point-spread

      Strampelli, Giovanni M. et al.

      Fecha de publicación:

      6
      2020
    • Statistical analysis of Galactic globular cluster type properties

      The analysis of pseudo-colour diagrams, the so-called chromosome maps, of Galactic globular clusters (GCs) permits to classify them into type I and type II clusters. Type II GCs are characterized by an above-the-average complexity of their chromosome maps and some of them are known to display star-to-star variations of slow neutron-capture reaction

      Simioni, M. et al.

      Fecha de publicación:

      4
      2020
    • The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of Single and Multiple Stellar Populations in Seven Bulge Globular Clusters

      In the present work we analyzed seven globular clusters (GCs) selected from their location in the Galactic bulge and with metallicity values in the range -1.30 ≲ [Fe/H] ≲ -0.50. The aim of this work is first to derive cluster ages assuming single stellar populations and second to identify the stars from first (1G) and second generations (2G) from

      Oliveira, R. A. P. et al.

      Fecha de publicación:

      3
      2020
    • The star formation history of the Sculptor dwarf spheroidal galaxy

      We present the star formation history (SFH) of the Sculptor dwarf spheroidal galaxy based on deep g, r photometry taken with Dark Energy Camera at the Blanco telescope, focusing our analysis on the central region of the galaxy extended up to ˜3 core radii. We have investigated how the SFH changes radially, subdividing the sampled area into four

      Bettinelli, M. et al.

      Fecha de publicación:

      8
      2019
    • Mapping the stellar age of the Milky Way bulge with the VVV. II. Deep JKs catalog release based on PSF photometry

      Context. The bulge represents the best compromise between old and massive Galactic components, and as such its study is a valuable opportunity to understand how the bulk of the Milky Way formed and evolved. In addition, being the only bulge in which we can individually resolve stars in all evolutionary sequences, the properties of its stellar

      Surot, F. et al.

      Fecha de publicación:

      9
      2019
    • Mapping the stellar age of the Milky Way bulge with the VVV. I. The method

      Context. Recent observational programs are providing a global view of the Milky Way bulge that serves as a template for detailed comparison with models and extragalactic bulges. A number of surveys (VVV, GIBS, GES, ARGOS, BRAVA, APOGEE) are producing comprehensive and detailed extinction, metallicity, kinematics, and stellar density maps of the

      Surot, F. et al.

      Fecha de publicación:

      3
      2019
    • The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XVII. Public Catalogue Release

      In this paper, we present the astrophotometric catalogues of 56 globular clusters and one open cluster. Astrometry and photometry are mainly based on images collected within the `HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation' (GO-13297, PI: Piotto), and the `ACS Survey of Galactic Globular

      Nardiello, D. et al.

      Fecha de publicación:

      12
      2018
    • The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XV. The Dynamical Clock: Reading Cluster Dynamical Evolution from the Segregation Level of Blue Straggler Stars

      The parameter A +, defined as the area enclosed between the cumulative radial distribution of blue straggler stars (BSSs) and that of a reference population, is a powerful indicator of the level of BSS central segregation. As part of the Hubble Space Telescope UV Legacy Survey of Galactic globular clusters (GCs), here we present the BSS population

      Ferraro, F. R. et al.

      Fecha de publicación:

      6
      2018
    • The Updated BaSTI Stellar Evolution Models and Isochrones. I. Solar-scaled Calculations

      We present an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library for a solar-scaled heavy element distribution. The main input physics that have been changed from the previous BaSTI release include the solar metal mixture, electron conduction opacities, a few nuclear reaction rates, bolometric

      Hidalgo, S. L. et al.

      Fecha de publicación:

      4
      2018
    • The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XIII. ACS/WFC parallel-field catalogues

      As part of the Hubble Space Telescope UV Legacy Survey of Galactic globular clusters, 110 parallel fields were observed with the Wide Field Channel of the Advanced Camera for Surveys, in the outskirts of 48 globular clusters, plus the open cluster NGC 6791. Totalling about 0.3 deg2 of observed sky, this is the largest homogeneous Hubble Space

      Simioni, M. et al.

      Fecha de publicación:

      5
      2018

    Charlas relacionadas

    No se han encontrado charlas relacionadas.

    Congresos relacionados

    No se han encontrado congresos relacionados.