Now showing items 418-437 of 517

  • Hong, Jie; Carlsson, Mats; Ding, M. D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Ellerman bombs (EBs) are brightenings in the Hα line wings that are believed to be caused by magnetic reconnection in the lower atmosphere. To study the response and evolution of the chromospheric line profiles, we perform ...
  • Rouppe, Van Der Voort Luc; Rutten, Robert; Vissers, Gregal Joan Maria (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    We describe a new quiet-Sun phenomenon which we call quiet-Sun Ellerman-like brightenings (QSEB). QSEBs are similar to Ellerman bombs (EB) in some respects but differ significantly in others. EBs are transient brightenings ...
  • Huse, Tor Helge (Master thesis / Hovedoppgave, 2005)
    During inflation, the potential of the inflaton scalar field $\phi$, drives the exponential expansion of the Universe. The nature of the inflaton potential is presently unknown, but one hopes to learn more from observations ...
  • Barve, Christopher Backløf (Master thesis / Masteroppgave, 2016)
    Recent observations support a significantly reduced visibility of Lyman-α (Lyα) flux from galaxies at redshifts z > 6. This is surprising considering that the visibility of Lyα flux has been observed to increase up towards ...
  • Baumschlager, Bernhard; Hensler, Gerhard; Steyrleithner, Patrick; Recchi, Simone (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present, for the first time, numerical simulations of young tidal dwarf galaxies (TDGs), including a self-consistent treatment of the tidal arm in which they are embedded. Thereby, we do not rely on idealized initial ...
  • Llinares, Claudio; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Several extensions of general relativity and high energy physics include scalar fields as extra degrees of freedom. In the search for predictions in the nonlinear regime of cosmological evolution, the community makes use ...
  • Unknown author (Series / Serietittel, 1950)
  • Okamoto, T. J.; Antolin, Patrick; De Pontieu, Bart Walter; Uitenbroek, Han; Van Doorsselaere, Tom; Yokoyama, T (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Transverse magnetohydrodynamic waves have been shown to be ubiquitous in the solar atmosphere and can, in principle, carry sufficient energy to generate and maintain the Sun's million-degree outer atmosphere or corona. ...
  • Gronke, Max Balthasar; Dijkstra, Mark; McCourt, Michael; Peng Oh, S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Motivated by observational and theoretical work that suggest very small-scale (≲ 1 pc) structure in the circumgalactic medium of galaxies and in other environments, we study Lyman-α (Lyα) radiative transfer in an extremely ...
  • Mas Ribas, Lluis; Hennawi, Joseph F (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The baryonic content and physical properties of the warm and hot (105 lesssim T lesssim 107 K) phases of the circumgalactic medium (CGM) are poorly constrained owing to the lack of observables probing the requisite range ...
  • Mendes Domingos Pereira, Tiago; Uitenbroek, Han (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    The emergence of three-dimensional magneto-hydrodynamic simulations of stellar atmospheres has sparked a need for efficient radiative transfer codes to calculate detailed synthetic spectra. We present RH 1.5D, a massively ...
  • Vargas dos santos, Marcelo; Alcaniz, Jailson S; Mota, David; Capozziello, Salvatore (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We investigate the efficiency of screening mechanisms in the hybrid metric-Palatini gravity. The value of the field is computed around spherical bodies embedded in a background of constant density. We find a thin shell ...
  • Koivisto, Tomi Sebastian; Mota, David; Zumalacárregui, Miguel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    It is shown that extensions to general relativity, which introduce a strongly coupled scalar field, can be viable if the interaction has a nonconformal form. Such disformal coupling depends upon the gradients of the scalar ...
  • Dahle, Håkon; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Wuyts, E; Abramson, L. E.; Koester, B. P.; Groeneboom, Nicolaas Ervik; Brinckmann, T. E.; Kristensen, M. T.; Lindholmer, M. O.; Nielsen, A; Krogager, J.-K.; Fynbo, J.P.U. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    We report the discovery of a unique gravitational lens system, SDSS J2222+2745, producing five spectroscopically confirmed images of a zs = 2.82 quasar lensed by a foreground galaxy cluster at zl = 0.49. We also present ...
  • Pérez-Ràfols, Ignasi; Font-Ribera, Andreu; Miralda-Escudé, Jordi; Blomqvist, Michael; Bird, Simeon; Busca, Nicolás G.; du Mas des Bourboux, Hélion; Mas Ribas, Lluis; Noterdaeme, Pasquier; Petitjean, Patrick; Rich, James; Schneider, Donald P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
  • Groeneboom, Nicolaas Ervik (Doctoral thesis / Doktoravhandling, 2010)
  • Ruud, Tone Melvær (Master thesis / Masteroppgave, 2012)
    The Q/U-Imaging ExperimenT (QUIET) is a ground-based coherent polarimeter experiment, primarily targeting the detection of low-l B-mode polarization in the CMB. Such modes are a signature of primordial tensor perturbations, ...
  • Rekaa, Vegard Lundby; Pecseli, Hans; Trulsen, Jan Karsten (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    The space-time evolution of an initial step-like plasma density variation is studied. We give particular attention to formulate the problem in a way that opens for the possibility of realizing the conditions experimentally. ...
  • Bose, Souvik; de Jorge Henriques, Vasco Manuel; Rouppe van der Voort, Luc; Mendes Domingos Pereira, Tiago (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Context: The solar chromosphere and the lower transition region are believed to play a crucial role in the heating of the solar corona. Models that describe the chromosphere (and the lower transition region), accounting ...
  • Remazeilles, M.; Dickinson, C.; Eriksen, Hans Kristian Kamfjord; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The measurement of the large-scale B-mode polarization in the cosmic microwave background (CMB) is a fundamental goal of future CMB experiments. However, because of unprecedented sensitivity, future CMB experiments will ...