Grupo de Estudios de Formación Estelar GEFE

    General
    Descripción

    El proyecto interno GEFE está enmarcado en el proyecto coordinado, ESTALLIDOS, financiado por el plan nacional desde el año 2001. El ultimo proyecto aprobado es ESTALLIDOS 6.0 (AYA2016- 79724-C4-2-P). En el proyecto GEFE trabajamos en base al caso científico del proyecto ESTALLIDOS 6.0.

    Los estallidos de formación estelar (Starbursts o SB) son clave la evolución de las galaxias y en la historia de formación estelar (FE) del Universo, la producción de metales, y en los procesos de retroalimentación que acoplan las galaxias con la red cósmica. Nuestro proyecto tiene como meta el estudio completo de la física de las regiones masivas del universo local, con objeto de entender el funcionamiento de las galaxias más lejanas y de los SBs más extremos. Combinamos estudios observacionales (usando telescopios terrestres y espaciales) con nuestros modelos teóricos. Entre las instalaciones que usaremos destacan los nuevos instrumentos de GTC, EMIR y MEGARA, en los que el equipo investigador participa y EMIR y MEGARA que entrarán en funcionamiento durante el periodo que cubre este proyecto.

    Hemos estructurado nuestra investigación de los próximos tres años alrededor de cinco objetivos:

    1) La interacción entre la FS masiva y el medio interestelar.

    2) El gas en la formación de las galaxias disco.

    3) El papel del entorno en la FS masiva y la evolución de galaxias.

    4) Formación estelar en el Universo temprano.

    5) Participación en la construcción de nueva instrumentación y en su verificación científica.

    Los resultados que esperamos son: i) mejorar la comprensión de la evolución química de las galaxias usando datos de IFUs y modelos bi-dimensionales, ii) entender el papel del gas molecular y los fotones energéticos de fondo, iii) desarrollar una técnica para hacer imagen del gas de la red cósmica que alimenta la formación estelar en galaxias, iv) caracterizar las propiedades químicas y dinámicas del gas que cae sobre las galaxias, v) descifrar las distintas formas en las que fecta a la formación estelar a lo largo de la vida del Universo, prestando especial atención al disparo de la FE en las galaxias con menos metales, vi) explicar como SB masivos evolucionan en modo de 'positive feedback', para entender los SB extremos en el Universo primitivo, vii) estudiar la FS en galaxias Ly-alpha y Ly-break, viii) buscar candidatos a ser estrellas de población III en galaxias extremadamente pobres en metales, locales y a alto 'redshift', ix) desarrollar las técnicas que permitan un uso eficiente de EMIR y MEGARA. Lideraremos casos científicos en los que se usan estos instrumentos, tanto durante la fase de verificación como en su explotación posterior.

    Investigador principal
    Personal del proyecto
    Colaboradores
    Dr.
    Nieves D. Castro Rodriguez
    Dr.
    Daniel Reverte Paya
    Dr.
    Ricardo Amorin Barbieri
    Dr.
    Rafael Guzmán Llorente
    Dr.
    Jesus Gallego Maestro
    Dr.
    Pablo Perez Gonzalez
    Dr.
    Bruce Elmegreen
    Dr.
    Debra Elmegreen
    1. Se ha descubierto la anticorrelación entre la tasa de formación estelar y la metalicidad del gas en discos de galaxias.
    2. Descubrimiento una galaxia de baja masa y alta metalicidad, que confirma la estocaticidad de la red cósmica alimentando la formación estelar.
    3. El polvo producido en las supernovas puede sobrevivir. Los resultados de las simulaciones podrian ser importantes para el universo primitivo.
    4. El survey SHARDs con sus filtros estrechos permite por primera vez identificar la muestra de galaxias emisoras en Lyman alfa y galaxias con continuo de lyman (lyman break). Se podra estudiar la evolucion entre clases.
    5. Se identifica un posible AGN binario en la galaxia Mrk 622

    Publicaciones relacionadas

    • WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan's Quintet
      We present a detailed study of the large-scale shock front in Stephan's Quintet, a by-product of past and ongoing interactions. Using integral-field spectroscopy from the new William Herschel Telescope Enhanced Area Velocity Explorer (WEAVE), recent 144 MHz observations from the LOFAR Two-metre Sky Survey, and archival data from the Very Large
      Arnaudova, M. I. et al.

      Fecha de publicación:

      12
      2024
      Número de citas
      0
    • Application of the Eddington inversion method to constrain the dark matter halo of galaxies using only observed surface brightness profiles
      Context. The halos of low-mass galaxies may allow us to constrain the nature of dark matter (DM), but the kinematic measurements needed to diagnose the required properties are technically extremely challenging. However, the photometry of these systems is doable. Aims. Using only stellar photometry, we wanted to constrain key properties of the DM
      Sánchez Almeida, Jorge et al.

      Fecha de publicación:

      10
      2024
      Número de citas
      2
    • The Stellar Distribution in Ultrafaint Dwarf Galaxies Suggests Deviations from the Collisionless Cold Dark Matter Paradigm
      Unraveling the nature of dark matter (DM) stands as a primary objective in modern physics. Here we present evidence suggesting deviations from the collisionless cold DM (CDM) paradigm. It arises from the radial distribution of stars in six ultrafaint dwarf (UFD) galaxies measured with the Hubble Space Telescope. After a trivial renormalization in
      Sánchez Almeida, Jorge et al.

      Fecha de publicación:

      9
      2024
      Número de citas
      6
    • CHEOPS in-flight performance. A comprehensive look at the first 3.5 yr of operations
      Context. Since the discovery of the first exoplanet almost three decades ago, the number of known exoplanets has increased dramatically. By beginning of the 2000s it was clear that dedicated facilities to advance our studies in this field were needed. The CHaracterising ExOPlanet Satellite (CHEOPS) is a space telescope specifically designed to
      Fortier, A. et al.

      Fecha de publicación:

      7
      2024
      Número de citas
      15
    • The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
      WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and a single large IFU
      Jin, Shoko et al.

      Fecha de publicación:

      5
      2024
      Número de citas
      124
    • More fundamental than the fundamental metallicity relation. The effect of the stellar metallicity on the gas-phase mass-metallicity and gravitational potential-metallicity relations
      Context One of the most fundamental scaling relations in galaxies is observed between metallicity and stellar mass - the mass-metallicity relation (MZR) - although recently a stronger dependence of the gas-phase metallicity with the galactic gravitational potential (ΦZR) has been reported. Further dependences of metallicity on other galaxy
      Sánchez-Menguiano, Laura et al.

      Fecha de publicación:

      2
      2024
      Número de citas
      2
    • WHaD diagram: Classifying the ionizing source with one single emission line
      Context. The usual approach to classify the ionizing source using optical spectroscopy is based on the use of diagnostic diagrams that compare the relative strength of pairs of collisitional metallic lines (e.g., [O III] and [N II]) to recombination hydrogen lines (e.g., Hβ and Hα). Despite it having been accepted as the standard procedure, it
      Sánchez, S. F. et al.

      Fecha de publicación:

      2
      2024
      Número de citas
      7
    • Stellar mass is not the best predictor of galaxy metallicity. The gravitational potential-metallicity relation ΦZR
      Context. Interpreting the scaling relations followed by galaxies is a fundamental tool for assessing how well we understand galaxy formation and evolution. Several scaling relations involving the galaxy metallicity have been discovered through the years, the foremost of which is the scaling with stellar mass. This so-called mass-metallicity
      Sánchez-Menguiano, Laura et al.

      Fecha de publicación:

      1
      2024
      Número de citas
      8
    • Supermassive black hole wake or bulgeless edge-on galaxy?. II. Order-of-magnitude analysis of the two physical scenarios
      Context. A recently discovered thin long object aligned with a nearby galaxy could be the stellar wake induced by the passage of a supermassive black hole (SMBH) kicked out from the nearby galaxy by the slingshot effect of a three-body encounter of SMBHs. Alternatively, the object could be a bulgeless edge-on galaxy coincidentally aligned with a
      Sánchez Almeida, J.

      Fecha de publicación:

      10
      2023
      Número de citas
      3
    • Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
      According to the current concordance cosmological model, dark matter (DM) particles are collisionless and produce self-gravitating structures with a central cusp, which, generally, is not observed. The observed density tends to a central plateau or core, explained within the cosmological model through the gravitational feedback of baryons on DM
      Sánchez Almeida, Jorge et al.

      Fecha de publicación:

      9
      2023
      Número de citas
      6
    • The PAU survey: classifying low-z SEDs using Machine Learning clustering
      We present an application of unsupervised Machine Learning clustering to the PAU survey of galaxy spectral energy distribution (SED) within the COSMOS field. The clustering algorithm is implemented and optimized to get the relevant groups in the data SEDs. We find 12 groups from a total number of 5234 targets in the survey at 0.01 < z < 0.28. Among
      González-Morán, A. L. et al.

      Fecha de publicación:

      9
      2023
      Número de citas
      1
    • Supermassive black hole wake or bulgeless edge-on galaxy?
      A recent paper reported the serendipitous discovery of a thin linear object interpreted as the trail of star-forming regions left behind by a runaway supermassive black hole (SMBH) kicked out from the center of a galaxy. Despite the undeniable interest in the idea, the actual physical interpretation is not devoid of difficulty. The wake of a SMBH
      Sánchez Almeida, Jorge et al.

      Fecha de publicación:

      5
      2023
      Número de citas
      6
    • Spatially resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: evidence for recent accretion of metal-poor gas
      Nearby metal-poor starburst dwarf galaxies present a unique opportunity to probe the physics of high-density star formation with a detail and sensitivity unmatched by any observation of the high-z Universe. Here, we present the first results from a chemodynamical study of the nearby, gas-rich starburst dwarf CGCG 007-025. We use VLT/MUSE integral
      del Valle-Espinosa, Macarena G. et al.

      Fecha de publicación:

      6
      2023
      Número de citas
      10
    • Hubble Space Telescope Observations of Tadpole Galaxies Kiso3867, SBS0, SBS1, and UM461
      Tadpole galaxies are metal-poor dwarfs with typically one dominant star-forming region, giving them a head-tail structure when inclined. A metallicity drop in the head suggests that gas accretion with even lower metallicity stimulated the star formation. Here we present multiband Hubble Space Telescope WFC3 and Advanced Camera for Surveys images of
      Elmegreen, Debra Meloy et al.

      Fecha de publicación:

      12
      2022
      Número de citas
      1
    • The Principle of Maximum Entropy and the Distribution of Mass in Galaxies
      We do not have a final answer to the question of why galaxies choose a particular internal mass distribution. Here we examine whether the distribution is set by thermodynamic equilibrium (TE). Traditionally, TE is discarded for a number of reasons including the inefficiency of two-body collisions to thermalize the mass distribution in a Hubble time
      Sánchez Almeida, Jorge

      Fecha de publicación:

      3
      2022
      Número de citas
      11
    • Dwarf Galaxies with Central Cores in Modified Newtonian Dynamics Gravity
      Some dwarf galaxies are within the Mondian regime at all radii, i.e., the gravitational acceleration provided by the observed baryons is always below the threshold of g † ≃ 1.2 × 10 -10 m s -2. These dwarf galaxies often show cores, in the sense that, assuming Newton's gravity to explain their rotation curves, the total density profile ρ(r)
      Sánchez Almeida, J.

      Fecha de publicación:

      11
      2022
      Número de citas
      3
    • EMIR, the near-infrared camera and multi-object spectrograph for the GTC. EMIR at GTC
      We present EMIR, a powerful near-infrared (NIR) camera and multi-object spectrograph (MOS) installed at the Nasmyth focus of the 10.4 m GTC. EMIR was commissioned in mid-2016 and is offered as a common-user instrument. It provides spectral coverage of 0.9-2.5 µm over a field of view (FOV) of 6.67' × 6.67' in imaging mode, and 6.67' × 4' in
      Garzón, F. et al.

      Fecha de publicación:

      11
      2022
      Número de citas
      13
    • Studying a precessing jet of a massive young stellar object within a chemically rich region
      Aims: In addition to the large surveys and catalogs of massive young stellar objects (MYSOs) and outflows, dedicated studies are needed of particular sources in which high angular observations, mainly at near-IR and (sub)millimeter wavelengths, are analyzed in depth, to shed light on the processes involved in the formation of massive stars. The
      Paron, S. et al.

      Fecha de publicación:

      10
      2022
      Número de citas
      3
    • Discovery of Faint Double-peak Hα Emission in the Halo of Low Redshift Galaxies
      Aimed at the detection of cosmological gas being accreted onto galaxies in the local universe, we examined the Hα emission in the halo of 164 galaxies in the field of view of the Multi-Unit Spectroscopic Explorer Wide survey (MUSE-Wide) with observable Hα (redshift <0.42). An exhaustive screening of the corresponding Hα images led us to select 118
      Sánchez Almeida, J. et al.

      Fecha de publicación:

      8
      2022
      Número de citas
      4
    • (Re)Solving reionization with Lyα: how bright Lyα Emitters account for the z ≍ 2-8 cosmic ionizing background
      The cosmic ionizing emissivity from star-forming galaxies has long been anchored to UV luminosity functions. Here, we introduce an emissivity framework based on Lyα emitters (LAEs), which naturally hones in on the subset of galaxies responsible for the ionizing background due to the intimate connection between production and escape of Lyα and LyC
      Matthee, Jorryt et al.

      Fecha de publicación:

      6
      2022
      Número de citas
      62

    Charlas relacionadas

    No se han encontrado charlas relacionadas.

    Congresos relacionados

    No se han encontrado congresos relacionados.