Now showing items 450-469 of 519

  • Quintero Noda, C.; Uitenbroek, Han; Katsukawa, Y.; Shimizu, T.; Oba, T.; Carlsson, Mats; Orozco Suarez, D.; Ruiz Cobo, B.; Kubo, M.; Anan, T.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We characterize the K i D1 & D2 lines in order to determine whether they could complement the 850 nm window, containing the Ca ii infrared triplet lines and several Zeeman sensitive photospheric lines, that was studied ...
  • Young, Peter R.; Tian, Hui; Peter, Hardi; Rutten, Robert; Nelson, Chris J.; Huang, Zhenghua; Schmieder, Brigitte; Vissers, Gregal Joan Maria; Toriumi, Shin; Rouppe van der Voort, Luc; Madjarska, Maria S.; Danilovic, Sanja; Berlicki, Arkadiusz; Chitta, Lakshmi Pradeep; Cheung, Mark C.M.; Madsen, Chad; Reardon, Kevin P.; Katsukawa, Yukio; Heinzel, Petr (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The term “ultraviolet (UV) burst” is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image ...
  • Fredriksen, Åshild; Pecseli, Hans; Trulsen, Jan Karsten (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    A simple magnetized plasma torus is modeled by using a 'top-hat' density variation. The benefit of this simplification is an exactly solvable model, allowing for a few additions, such as an externally maintained parabolic ...
  • Strøm, Elisabeth (Master thesis / Masteroppgave, 2019)
    Weak gravitational lensing provides a way of estimating the mass and mass distribution of galaxy clusters at large radii. The clusters act as lenses, so that light emitted by background sources, is bent and distorted by ...
  • Fuskeland, Unni; Wehus, Ingunn Kathrine; Eriksen, Hans Kristian Kamfjord; Næss, Sigurd Kirkevold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We estimate the spectral index, β, of polarized synchrotron emission as observed in the 9 yr Wilkinson Microwave Anisotropy Probe sky maps using two methods, linear regression ("T-T plot") and maximum likelihood. We partition ...
  • Silva, M. F.; Winther, Hans Arnold; Mota, David; Martins, Carlos Jose Amaro Parente (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We investigate the variation of the fine-structure constant, α, in symmetron models using N-body simulations in which the full spatial distribution of α at different redshifts has been calculated. In particular, we obtain ...
  • Fischer, Travis C.; Rigby, J. R.; Mahler, G.; Gladders, M.; Sharon, K.; Florian, M.; Kraemer, S.; Bayliss, M.; Dahle, Håkon; Felipe Barrientos, L. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We present the first spatially resolved analysis of rest-frame optical and UV imaging and spectroscopy for a lensed galaxy at z = 2.39 hosting a Seyfert active galactic nucleus (AGN). Proximity to a natural guide star has ...
  • Bayliss, Matthew B.; Sharon, Keren; Acharyya, Ayan; Gladders, Michael D.; Rigby, Jane R.; Bian, Fuyan; Bordoloi, Rongmon; Runnoe, Jessie; Dahle, Håkon; Kewley, Lisa; Florian, Michael; Johnson, Traci; Paterno-Mahler, Rachel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We report the detection of extended Lyα emission from the host galaxy of SDSS J2222+2745, a strongly lensed quasar at z = 2.8. Spectroscopic follow-up clearly reveals extended Lyα in emission between two images of the ...
  • Kuridze, D.; de Jorge Henriques, Vasco Manuel; Mathioudakis, M.; Rouppe van der Voort, Luc; de la Cruz Rodriguez, Jaime; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We study the M1.9-class solar flare SOL2015-09-27T10:40 UT using high-resolution full Stokes imaging spectropolarimetry of the Ca ii 8542 Å line obtained with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar ...
  • Selj, Josefine Helene (Master thesis / Masteroppgave, 2007)
  • Kuridze, D.; de Jorge Henriques, Vasco Manuel; Mathioudakis, M.; Koza, J.; Zaqarashvili, T. V.; Rybak, J; Hanslmeier, A.; Keenan, F. P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Sapa, Stharporn; Karwan, Khamphee; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We investigate the effects of a disformal coupling between dark energy and dark matter in the predictions of the spherical collapse and its signatures in galaxy cluster number counts. We find that the disformal coupling ...
  • Nielsen, Robert (Master thesis / Masteroppgave, 2011)
    This thesis is a study of the dynamics and virialization of cosmic structures in the framework of flat cosmological models where the properties of the dark energy component plays an important role in the global and local ...
  • Nafstad, Halvor (Master thesis / Masteroppgave, 2019)
    Late time accelerated expansion of the universe is usually considered to be the result of dark energy, and the standard model of cosmology implements the cosmological constant as the drive of the acceleration of the universe. ...
  • Spicules 
    Bjølseth, Silje (Master thesis / Masteroppgave, 2008)
    The solar chromosphere has previously been thought to be a homogenic layer of the solar atmosphere, but better observations have made it evident that the chromosphere is a highly dynamic area. Spicules are structures ...
  • Skorbakk, Ine (Master thesis / Masteroppgave, 2010)
    In this thesis the correlation between star formation and dynamical state of a statistical well defined selection of galaxy clusters have been studied. From simulations and theory it is expected strong correlations between ...
  • Berntsen, Bård Eirik (Master thesis / Masteroppgave, 2009)
  • Markel, Evan Benjamin Edmund (Master thesis / Masteroppgave, 2016)
    The Planck Sunyaev-Zeldovich Cluster catalogue provides an all-sky set of SZ detected galaxy clusters, which is the first of its kind. SZ signals are independent of redshift which allows a greater volume of space to be ...
  • Stepan, Jiri; Trujillo Bueno, J.; Belluzzi, Luca; Asensio Ramos, A.; Manso Sainz, R.; del Pino Aleman, T.; Casini, Roberto; Kano, Ryouhei; Winebarger, Amy R.; Auchère, Frédéric; Ishikawa, Ryohko; Narukage, Noriyuki; Kobayashi, Ken; Bando, Takamasa; Katsukawa, Yukio; Kubo, Masahito; Ishikawa, Shin'nosuke; Giono, Gabriel; Hara, Hirohisa; Suematsu, Yoshinori; Shimizu, Toshifumi; Sakao, Taro; Tsuneta, Saku; Ichimoto, Kiyoshi; Cirtain, Jonathan W.; Champey, Patrick R.; De Pontieu, Bart Walter; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    On 2015 September 3, the Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP) successfully measured the linear polarization produced by scattering processes in the hydrogen Lyα line of the solar disk radiation, revealing ...
  • van der Burg, Remco F.J.; McGee, Sean; Aussel, Hervé; Dahle, Håkon; Arnaud, Monique; Pratt, Gabriel W.; Muzzin, Adam (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We study the abundance of star-forming and quiescent galaxies in a sample of 21 clusters at 0.5 <  z <  0.7, detected with the Planck satellite. Thanks to the large volume probed by Planck, these systems are extremely ...