Publications

  • NSB difference for a given celestial position
    Natural Night Sky Brightness during Solar Minimum

    In 2018, Solar Cycle 24 entered into a solar minimum phase. During this period, 11 million zenithal night sky brightness (NSB) data were collected at different dark sites around the planet, including astronomical observatories and natural protected areas, with identical broadband Telescope Encoder and Sky Sensor photometers (based on the Unihedron

    Miguel R. Alarcón et al.

    Advertised on:

    6
    2021
  • SG-WAS photometer.
    SG-WAS: A New Wireless Autonomous Night Sky Brightness Sensor

    The main features of SG-WAS (SkyGlow Wireless Autonomous Sensor), a low-cost device for measuring Night Sky Brightness (NSB), are presented. SG-WAS is based on the TSL237 sensor –like the Unihedron Sky Quality Meter (SQM) or the STARS4ALL Telescope Encoder and Sky Sensor (TESS)–, with wireless communication (LoRa, WiFi, or LTE-M) and solar-powered

    Miguel R. Alarcon et al.

    Advertised on:

    8
    2021
  • East or Easter? keys to the orientation of Romanesque churches along the way of Saint James

    The pilgrimage along the Way of Saint James constituted the principal mechanism for the introduction of new currents of thought into the Iberian Peninsula, such as Romanesque architecture. Taking this into account, we examined whether the standard tradition on the orientation of Christian churches was followed. We measured the orientation of 108

    Urrutia-Aparicio, Maitane et al.

    Advertised on:

    8
    2021
  • Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data

    We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ-ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly timescale allows us to identify transient and variable sources that were not yet reported in other Fermi-LAT

    Baldini, L. et al.

    Advertised on:

    9
    2021
  • HST grism spectroscopy of z ∼ 3 massive quiescent galaxies. Approaching the metamorphosis

    Tracing the emergence of the massive quiescent galaxy (QG) population requires the build-up of reliable quenched samples by distinguishing these systems from red, dusty star-forming sources. We present Hubble Space Telescope WFC3/G141 grism spectra of ten quiescent galaxy candidates selected at 2.5 < z < 3.5 in the COSMOS field. Spectroscopic

    D'Eugenio, C. et al.

    Advertised on:

    9
    2021
  • Limitations of the Ca II 8542 Å Line for the Determination of Magnetic Field Oscillations

    Chromospheric umbral oscillations produce periodic brightenings in the core of some spectral lines, known as umbral flashes. They are also accompanied by fluctuations in velocity, temperature, and, according to several recent works, magnetic field. In this study, we aim to ascertain the accuracy of the magnetic field determined from inversions of

    Felipe, Tobias et al.

    Advertised on:

    9
    2021