Now showing items 708-727 of 1247

  • Seljebotn, Dag Sverre; Mardal, Kent-Andre; Jewell, J. B.; Eriksen, Hans Kristian Kamfjord; Bull, Philip James (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We present a multi-level solver for drawing constrained Gaussian realizations or finding the maximum likelihood estimate of the cosmic microwave background sky, given noisy sky maps with partial sky coverage. The method ...
  • Fredborg, Eirik Elias Prydz (Master thesis / Masteroppgave, 2022)
  • Seljebotn, Dag Sverre; Bærland, Trygve; Eriksen, Hans Kristian Kamfjord; Mardal, Kent-Andre; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We present a Bayesian model for multi-resolution component separation for cosmic microwave background (CMB) applications based on Wiener filtering and/or computation of constrained realizations, extending a previously ...
  • Froment, Clara; Antolin, Patrick; de Jorge Henriques, Vasco Manuel; Kohutova, Petra; Rouppe van der Voort, Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Context. Thermal non-equilibrium (TNE) is a phenomenon that can occur in solar coronal loops when the heating is quasi-constant and highly-stratified. Under such heating conditions, coronal loops undergo cycles of evaporation ...
  • Antolin, Patrick; Vissers, Gregal Joan Maria; Mendes Domingos Pereira, Tiago; Rouppe, Van Der Voort Luc; Scullion, Eamon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We analyze coordinated observations of coronal rain in loops, spanning chromospheric, transition region (TR), and coronal temperatures with sub-arcsecond spatial resolution. Coronal rain is found to be a highly multithermal ...
  • Arroyave, Isabel Montoya (Doctoral thesis / Doktoravhandling, 2024)
    In my thesis, I investigated local (ultra-)luminous infrared galaxies, typically identified as galaxy mergers. These galaxies are fascinating due to their intense star formation and active galactic nuclei, which can lead ...
  • Izadparast, Masoumeh (Master thesis / Masteroppgave, 2015)
    Magnetic bright points (MBPs) are small-scale (generally kG) magnetic features, ubiqui- tous in the lower solar atmosphere, and are a manifestation of solar magnetism. They represent the cross-sections of thin flux tubes ...
  • dos santos, Luiz F.G; Bose, Souvik; Salvatelli, Valentina; Neuberg, Brad; Cheung, M. C. M.; Janvier, Miho; Jin, Meng; Gal, Yarin; Boerner, Paul; Baydin, Atilim, Günes (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Context. Solar activity plays a quintessential role in affecting the interplanetary medium and space weather around Earth. Remote-sensing instruments on board heliophysics space missions provide a pool of information about ...
  • Evans, Samuel; Oppenheim, Meers; Martinez-Sykora, Juan; Dimant, Yakov; Xiao, Richard (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract Models fail to reproduce observations of the coldest parts of the Sun’s atmosphere, where interactions between multiple ionized and neutral species prevent an accurate MHD representation. This paper ...
  • Wargnier, Q.M.; Martinez-Sykora, Juan; Hansteen, Viggo Haraldson; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract Our understanding of magnetic reconnection (MR) under chromospheric conditions remains limited. Recent observations have demonstrated the important role of ion–neutral interactions in the dynamics of the ...
  • Shetye, Juie; Verwichte, Erwin; Stangalini, Marco; Judge, Philip G.; Doyle, J. G.; Arber, Tony; Scullion, Eamon; Wedemeyer, Sven (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    e report observations of small-scale swirls seen in the solar chromosphere. They are typically 2 Mm in diameter and last around 10 minutes. Using spectropolarimetric observations obtained by the CRisp Imaging Spectro-Polarimeter ...
  • Guise, Ella; Hönig, S. F.; Almeyda, T.; Horne, K.; Kishimoto, M.; Aguena, Michel; Allam, Sahar; Andrade-Oliveira, F.; Asorey, Jacobo; Banerji, M.; Bertin, E.; Boulderstone, B.; Brooks, D.; Burke, David L.; Carnero Rosell, Aurelio; Carollo, Daniela; Carrasco Kind, Matias; Carretero, Jorge; Costanzi, Matteo; da Costa, L. N.; Davis, Tamara M.; De Vicente, Juan; Doel, P.; Everett, S.; Ferrero, Ismael; Flaugher, B.; Frieman, J.; Gandhi, Poshak; Goad, M.; Gruen, Daniel; Gruendl, Robert A.; Gschwend, J.; Gutierrez, G.; Hinton, Samuel R.; Hollowood, Devon L.; Honscheid, Klaus; James, D. J.; Johnson, Michael A. C.; Kuehn, Kyler; Lewis, Geraint F.; Lidman, Christopher; Lima, M.; Maia, Marcio A. G.; Malik, U.; Menanteau, F.; Miquel, Ramon; Morgan, R.; Ogando, Ricardo L. C.; Palmese, Antonella; Paz-Chinchón, Francisco; Pereira, Maria Elidaiana da Silva; Pieres, A.; Plazas Malagón, A. A.; Sanchez, E.; Scarpine, V.; Serrano, S.; Sevilla-Noarbe, Ignacio; Seymour, Nicholas; Smith, Mathew; Soares-Santos, Marcelle; Suchyta, E.; Swanson, Molly E. C.; Tarle, G.; To, Chun-Hao; Tucker, B. E. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    ABSTRACT We present multiwavelength spectral and temporal variability analysis of PKS 0027-426 using optical griz observations from Dark Energy Survey between 2013 and 2018 and VEILS Optical Light curves of ...
  • Karman, W.; Caputi, K.; Caminha, G. B.; Gronke, Max Balthasar; Grillo, C.; Balestra, I.; Rosati, P.; Vanzella, E.; Coe, D.; Dijkstra, Mark; Koekemoer, A.; McLeod, D.; Mercurio, A.; Nonino, M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    In spite of their conjectured importance for the Epoch of Reionization, the properties of low-mass galaxies are currently still very much under debate. In this article, we study the stellar and gaseous properties of faint, ...
  • Li, Baojiu; Mota, David; Barrow, J. D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    We introduce the N-body simulation technique to follow structure formation in linear and nonlinear regimes for the extended quintessence models (scalar-tensor theories in which the scalar field has a self-interaction ...
  • Opheimsbakken, Håkon (Master thesis / Masteroppgave, 2014)
    Neutrinos are very weakly interacting particles with a low mass. In fact, the mass of the neutrinos has not yet been determined by experiments or observations. Still, neutrinos are a good candidate for some of the dark ...
  • Oppizzi, Filippo; Renzi, Alessandro; Liguori, Michele; Hansen, Frode Kristian; Marinucci, Domenico; Baccigalupi, Carlo; Bertacca, Daniele; Poletti, Davide (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Foreground components in the Cosmic Microwave Background (CMB) are sparse in a needlet representation, due to their specific morphological features (anisotropy, non-Gaussianity). This leads to the possibility of applying ...
  • Chappell Iii, Bruce Arnold (Master thesis / Masteroppgave, 2021)
    Synthetic spectra calculated from model solar atmospheres are central to our understanding of the connection between the observed intensity and the solar atmosphere. To obtain synthetic profiles in the general case, we ...
  • Garay, Carlos Peña; Verde, Licia; Jimenez, Raul (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    Recent constrains on the sum of neutrino masses inferred by analyzing cosmological data, show that detecting a non-zero neutrino mass is within reach of forthcoming cosmological surveys. Such a measurement will imply a ...
  • Jenssen, Espen Sem (Master thesis / Masteroppgave, 2016)
    The universe is full of stuff we cannot see, neither directly or indirectly. We do not understand the nature of the mysterious dark matter and how it interacts with normal matter. Big Bang Nucleosynthesis (BBN) provides ...
  • Ovaldsen, Jan-Erik (Master thesis / Hovedoppgave, 2002)
    Five years (1992-1997, ~2650 images) of optical observations of the gravitational lens system QSO 0957+561 were analyzed using a new photometry package developed by Jan Teuber and me. My supervisor was Prof. Rolf Stabell, ...