Now showing items 10-29 of 603

  • Fantaye, Yabebal Tadesse; Marinucci, Domenico; Hansen, Frode Kristian; Maino, Davide (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    The Gaussian kinematic formula (GKF) [R. J. Adler and J. E. Taylor, Random Fields and Geometry (Springer, New York, 2007).] is an extremely powerful tool allowing for explicit analytic predictions of expected values of ...
  • Pettersen, Bjørn Ragnvald (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We present unpublished observations of Comet Donati 1858 V recently recovered in an old storage facility at the University Observatory in Oslo. Carefully-made drawings reveal temporal changes in the appearance of this ...
  • Sivertsen, Sofie Vike (Master thesis / Masteroppgave, 2011)
    The existence of dark matter is a well established fact both due to galaxy rotation curves and also due to the CMB temperature anisotropies and the matter power spectra. According to the $\Lambda$CDM model, the so called ...
  • Hagala, Robert (Doctoral thesis / Doktoravhandling, 2019)
    Einstein's theory of general relativity is currently our best model for how gravity works. It can be used to predict motions of planets, the speed-up of clocks on GPS satellites, and gravitational waves. General relativity ...
  • Kowalski, Adam F.; Allred, Joel C.; Daw, A.; Cauzzi, Gianna; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    The 2014 March 29 X1 solar flare (SOL20140329T17:48) produced bright continuum emission in the far- and near-ultraviolet (NUV) and highly asymmetric chromospheric emission lines, providing long-sought constraints on the ...
  • Graham, David R.; De Pontieu, Bart Walter; Testa, Paola (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Active region moss—the upper transition region of hot loops—was observed exhibiting rapid intensity variability on timescales of order 15 s by Testa et al. in a short time series (~150 s) data set from Hi-C (High-resolution ...
  • Vissers, Gregal Joan Maria; Rouppe van der Voort, Luc; Rutten, Robert (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Ellerman bombs are transient brightenings in the wings of Hα 6563 Å that pinpoint photospheric sites of magnetic reconnection in solar active regions. Their partial visibility in the 1600 Å and 1700 Å continua registered ...
  • Banerji, Ranajoy; Patanchon, Guillaume; Delabrouille, Jacques; Hazumi, Masashi; Hoang, Duc Thuong; Ishino, Hirokazu; Matsumura, Tomotake (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Future Cosmic Microwave Background (CMB) satellite missions aim at using the B-mode polarisation signal to measure the tensor-to-scalar ratio r with a sensitivity σ(r) of the order of ≤ 10-2. Small uncertainties in the ...
  • Zana, Tommaso; Dotti, Massimo; Capelo, Pedro R.; Mayer, Lucio; Haardt, Francesco; Shen, Sijing; Bonoli, Silivia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    It has been proposed that close interactions with satellite galaxies can significantly perturb the morphology of the main galaxy. However, the dynamics of an already formed bar following the interaction with the external ...
  • Zana, Tommaso; Capelo, Pedro R.; Dotti, Massimo; Mayer, Lucio; Lupi, Alessandro; Haardt, Francesco; Bonoli, Silivia; Shen, Sijing (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Bars are a key factor in the long-term evolution of spiral galaxies, in their unique role in redistributing angular momentum and transporting gas and stars on large scales. The Eris-suite simulations are cosmological ...
  • Hoftuft, Jostein (Master thesis / Masteroppgave, 2009)
    The cosmic microwave background (CMB) radiation at 2.7 K is the leftover radiation from the Big Bang. By studying this radiation we can extract much information about the universe we live in. CMB experiments over the last ...
  • Mason, Charlotte A.; Treu, Tommaso; De Barros, Stephane; Dijkstra, Mark; Fontana, Adriano; Mesinger, Andrei; Pentericci, Laura; Trenti, Michele; Vanzella, Eros (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Recent detections of Lyman alpha (Lyα) emission from z > 7.5 galaxies were somewhat unexpected given a dearth of previous non-detections in this era when the intergalactic medium (IGM) is still highly neutral. But these ...
  • Druett, Malcolm; Scullion, Eamon; Zharkova, Valentina; Matthews, Sarah; Zharkov, Sergei; Rouppe van der Voort, Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    The observations of solar flare onsets show rapid increase of hard and soft X-rays, ultra-violet emission with large Doppler blue shifts associated with plasma upflows, and Hα hydrogen emission with red shifts up to 1–4 Å. ...
  • Sommer, Natalia Eiré (Master thesis / Masteroppgave, 2016)
  • Jimenez, Jose Beltran; Golovnev, A.; Karčiauskas, Mindaugas; Koivisto, Tomi Sebastian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    The bimetric variational principle is a subtle reinterpretation of general relativity that assumes the spacetime connection to be generated by an independent metric. Unlike the so-called Palatini formalism that promotes ...
  • Hansteen, Viggo; Archontis, Vasilis; Mendes Domingos Pereira, Tiago; Carlsson, Mats; Rouppe van der Voort, Luc; Leenaarts, Jorrit (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging ...
  • Hagstotz, Steffen; Gronke, Max Balthasar; Mota, David; Baldi, Marco (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Searches for modified gravity in the large-scale structure try to detect the enhanced amplitude of density fluctuations caused by the fifth force present in many of these theories. Neutrinos, on the other hand, suppress ...
  • Salzano, Vincenzo; Mota, David; Capoziello, S.; Donahue, Megan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 American Physical Society
  • Chintzoglou, G.; De Pontieu, Bart Walter; Martinez-Sykora, Juan; Pereira, Tiago Mendes Domingos; Vourlidas, A.; Beltran, Samuel Tun (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present results from an observing campaign in support of the VAULT2.0 sounding rocket launch on 2014 September 30. VAULT2.0 is a Lyα (1216 Å) spectroheliograph capable of providing spectroheliograms at high cadence. Lyα ...
  • McGreer, Ian D; Clément, Benjamin; Mainali, Ramesh; Stark, Daniel P.; Gronke, Max Balthasar; Dijkstra, Mark; Fan, Xiaohui; Bian, Fuyan; Frye, Brenda; Jiang, Linhua; Kneib, Jean-Paul; Limousin, Marceau; Walth, Gregory (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present a detailed study of an unusually bright, lensed galaxy at z = 5.424 discovered within the CFHTLS imaging survey. With an observed flux ofiAB =23.0, J141446.82+544631.9 is one of the brightest galaxies known at ...