Astrophysical: Techniques

  • Publication
    Two-dimensional spectroscopy of the Seyfert galaxies NGC 5728 and 4151 in the [OIII] lambdalambda4959, 5007 and Hα spectral ranges
    We have performed two-dimensional spectroscopy of the Seyfert galaxies NGC 5728 and 4151 in the 4500-7500A spectral range. The data (especially the [OIII]...
  • Publication
    Two-dimensional Spectroscopy Reveals an Arc of Extended Emission in the Gravitational Lens System Q2237+0305
    We present two-dimensional spectroscopy of the gravitational lens system Q2237+0305 (Einstein Cross) obtained with the INTEGRAL fiber system in subarcsecond...
  • Publication
    Two-dimensional, high spatial resolution, solar spectroscopy using a correlation tracker. I. Correlation tracker description.
    In this paper the description of the Solar Correlation Tracker prototype built by the Instituto de Astrof isica de Canarias is presented. The system is mainly...
  • Publication
    Two-dimensional, high spatial resolution, solar spectroscopy using a Correlation Tracker. II. Maps of spectral quantities.
    In this paper we illustrate some of the capabilities of the Correlation Tracker prototype developed at the Instituto de Astrofisica de Canarias used for two...
  • Publication
    Type Ia supernovae with and without blueshifted narrow Na I D lines - how different is their structure?
    In studies on intermediate- and high-resolution spectra of Type Ia supernovae (SNe Ia), some objects exhibit narrow Na I D absorptions often blueshifted with...
  • Publication
    Ultra-deep imaging of NGC 1052-DF2 and NGC 1052-DF4 to unravel their origins
    A number of scenarios have been proposed to explain the low velocity dispersion (and hence possible absence of dark matter) of the low surface brightness...
  • Publication
    Uncertainties in the determination of the Stokes parameters due to photon noise.
    We derive inequalities which restrict the precision of the Stokes parameters imposed by photon noise. The signal-to-noise ratio of the measured Stokes...
  • Publication
    Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076
    Context. TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting a bright (G = 8.9 mag), young (340 ± 80 Myr) K-type star. Although a validated...
  • Publication
    Understanding the thermal and magnetic properties of an X-class flare in the low solar atmosphere
    We analyse the spatial distribution and vertical stratification of the physical parameters of the solar atmosphere when an X-class flare occurs. We made use of...