Browsing by Author "García, Beatríz"

Filter results by typing the first few letters
Now showing 1 - 6 of 6
  • Thumbnail Image
    Item
    A catalog of the highest-energy cosmic rays recorded during phase I of operation of the Pierre Auger observatory
    (2023-01-01) García, Beatríz
    A catalog containing details of the highest-energy cosmic rays recorded through the detection of extensive air showers at the Pierre Auger Observatory is presented with the aim of opening the data to detailed examination. Descriptions of the 100 showers created by the highest-energy particles recorded between 2004 January 1 and 2020 December 31 are given for cosmic rays that have energies in the range 78–166 EeV. Details are also given on a further nine very energetic events that have been used in the calibration procedure adopted to determine the energy of each primary. A sky plot of the arrival directions of the most energetic particles is shown. No interpretations of the data are offered.
  • Thumbnail Image
    Item
    ¿Argentina debe invertir en grandes proyectos internacionales?
    (2023-01-01) García, Beatríz; Bilmes, Gabriel
    En este artículo se sostiene, por un lado, que la principal razón detrás de las inversiones que se realizan en los grandes proyectos científicos internacionales de ciencia básica no son los nuevos conocimientos que se obtienen, sino esencialmente los beneficios que brindan a las empresas multinacionales y los países centrales las aplicaciones prácticas de los desarrollos asociados a ellos, sobre todo en la industria, la producción y la defensa. Por otro lado, se describen, brevemente, algunos de los grandes proyectos e instrumentos que, en el marco de la cooperación internacional, se están desarrollando en Argentina. Como ejemplo, se analiza el caso del Observatorio Pierre Auger, ubicado en Malargüe, Mendoza, mostrando el impacto tecnológico, productivo y social que ha tenido en la región. Se concluye que cuando estos proyectos están localizados en el país y posibilitan el desarrollo científico, tecnológico y productivo local, pueden implicar oportunidades para las regiones que los albergan. Por el contrario, si son del tipo “llave en mano” o si las instalaciones e instrumentos se encuentran en otro país, sobre todo uno central, no existen tales beneficios.
  • Thumbnail Image
    Item
    Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory
    (2023-01-01) García, Beatríz
    In this work we present the interpretation of the energy spectrum and mass composition data as measured by the Pierre Auger Collaboration above 6×1017 eV. We use an astrophysical model with two extragalactic source populations to model the hardening of the cosmic-ray flux at around 5×1018 eV (the so-called “ankle” feature) as a transition between these two components. We find our data to be well reproduced if sources above the ankle emit a mixed composition with a hard spectrum and a low rigidity cutoff. The component below the ankle is required to have a very soft spectrum and a mix of protons and intermediate-mass nuclei. The origin of this intermediate-mass component is not well constrained and it could originate from either Galactic or extragalactic sources. To the aim of evaluating our capability to constrain astrophysical models, we discuss the impact on the fit results of the main experimental systematic uncertainties and of the assumptions about quantities affecting the air shower development as well as the propagation and redshift distribution of injected ultra-high-energy cosmic rays (UHECRs).
  • Thumbnail Image
    Item
    QUBIC Experiment toward the first light
    (2022-01-01) García, Beatríz
    The Q & U Bolometric Interferometer for Cosmology (QUBIC) is a cosmology experiment that aims to measure the B-mode polarization of the cosmic microwave background (CMB). Measurements of the primordial B-mode pattern of the CMB polarization are in fact among the most exciting goals in cosmology as it would allow testing of the infationary paradigm. Many experiments are attempting to measure the B-modes, from the ground and the stratosphere, using imaging Stokes polarimeters. The QUBIC collaboration developed an innovative concept to measure CMB polarization using bolometric interferometry. This approach mixes the high sensitivity of bolometric detectors with the accurate control of systematics due to the interferometric layout of the instrument. We present the calibration results for the Technological Demonstrator, before its commissioning in the Argentinian observing site and preparation for frst light.
  • Thumbnail Image
    Item
    Search for ultra-high-energy photons from gravitational wave sources with the Pierre Auger
    (2023-01-01) García, Beatríz
    A search for time-directional coincidences of ultra-high-energy (UHE) photons above 10 EeV with gravitational wave (GW) events from the LIGO/Virgo runs O1 to O3 is conducted with the Pierre Auger Observatory. Due to the distinctive properties of photon interactions and to the background expected from hadronic showers, a subset of the most interesting GW events is selected based on their localization quality and distance. Time periods of 1000 s around and 1 day after the GW events are analyzed. No coincidences are observed. Upper limits on the UHE photon fluence from a GW event are derived that are typically at ∼7 MeV cm−2 (time period 1000 s) and ∼35 MeV cm−2 (time period 1 day). Due to the proximity of the binary neutron star merger GW170817, the energy of the source transferred into UHE photons above 40 EeV is constrained to be less than 20% of its total GW energy. These are the first limits on UHE photons from GW sources.
  • Thumbnail Image
    Item
    SonoUno Web : an innovative user centred web interface
    (2022-01-01) De la Vega, Gonzalo; Dominguez, Martin; Casado, Johanna; García, Beatríz
    Sonification as a complement of visualization is been under research for decades as a new ways of data deployment. ICAD conferences, gather together specialists from different disciplines to discuss about sonification. Different tools as sonoUno, starSound and Web Sandbox are attempt to reach a tool to open astronomical data sets and sonify it in conjunction to visualization. In this contribution, the sonoUno web version is presented, this version allows user to explore data sets without any installation. The data can be uploaded or a pre-loaded file can be opened, the sonification and the visual characteristics of the plot can be customized on the same window. The plot, sound and marks can be saved. The web interface were tested with the main used screen readers in order to confirm their good performance.