Journal: Astronomy and Astrophysics

  • Publication
    Two-fluid simulations of Rayleigh-Taylor instability in a magnetized solar prominence thread. II. Effects of collisionality
    Solar prominences are formed by partially ionized plasma with inter-particle collision frequencies generally warranting magnetohydrodynamic treatment. In this...
  • Publication
    Two-fluid simulations of waves in the solar chromosphere. I. Numerical code verification
    Solar chromosphere consists of a partially ionized plasma, which makes modeling the solar chromosphere a particularly challenging numerical task. Here we...
  • Publication
    Two-fluid simulations of waves in the solar chromosphere. II. Propagation and damping of fast magneto-acoustic waves and shocks
    Waves and shocks traveling through the solar chromospheric plasma are influenced by its partial ionization and weak collisional coupling, and may become...
  • Publication
    Type-II surface brightness profiles in edge-on galaxies produced by flares
    Previous numerical studies had apparently ruled out the possibility that flares in galaxy discs could give rise to the apparent breaks in their luminosity...
  • Publication
    Ubiquitous hundred-Gauss magnetic fields in solar spicules
    Aims: We aim to study the magnetic field in solar spicules using high-resolution spectropolarimetric observations in the Ca II 8542 Å line obtained with the...
  • Publication
    Ubiquitous quiet-Sun jets
    Context. IMaX/Sunrise has recently reported the temporal evolution of highly dynamic and strongly Doppler shifted Stokes V signals in the quiet Sun. Aims: We...
  • Publication
    Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
    Aims: We try to identify ultra-cool dwarfs from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with SDSS i-z and r-z colors. We also obtain...
  • 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
    UltraCompCAT: A comprehensive catalogue of ultra-compact and short orbital period X-ray binaries
    Ultracompact X-ray binaries (UCXBs) are a distinctive but elusive family of low-mass X-ray binaries (LMXBs) characterised by their tight orbits and degenerate...