Now showing items 564-583 of 610

  • Axelsson, Magnus; Ihle, Håvard Tveit; Scodeller, Sandro; Hansen, Frode Kristian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We test for foreground residuals in the foreground-cleaned Planck cosmic microwave background (CMB) maps outside and inside the U73 mask commonly used for cosmological analysis. The aim of this paper is to introduce a new ...
  • Nadathur, Seshadri; Percival, Will J.; Beutler, Florian; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • Llinares, Claudio (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The dynamics of globular clusters has been studied in great detail in the context of general relativity as well as with modifications of gravity that strongly depart from the standard paradigm such as Modified Newtonian ...
  • Jønvik, Sara Clausen (Master thesis / Masteroppgave, 2017)
    We perform an investigation of quadru- and octopolar asymmetry in the CMB data by expanding the on the study of alignment and angular clustering of the dipole components of the CMB power distribution across multipoles l = ...
  • Chung, Andrew S.; Dijkstra, Mark; Ciardi, Benedetta; Kakiichi, Koki; Naab, Thorsten (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Galactic outflows are critical to our understanding of galaxy formation and evolution. However, the details of the underlying feedback process remain unclear. We compare Ly α observations of the circumgalactic medium (CGM) ...
  • Chakrabarti, Sukanya; Chang, Philip; O'Shaughnessy, Richard; Brooks, Alyson M.; Shen, Sijing; Bellovary, Jillian; Gladysz, Wojciech; Belczynski, Chris (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We investigate the contribution of outer H i disks to the observable population of merging black hole binaries. Like dwarf galaxies, the outer H i disks of spirals have low star formation rates and lower metallicities than ...
  • Belladitta, Silvia; Moretti, A.; Caccianiga, A.; Spingola, C.; Severgnini, Paolo; Della Ceca, R.; Ghisellini, Gabriele; Dallacasa, D.; Sbarrato, T.; Cicone, Claudia; Cassarà, L. P.; Pedani, M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present the discovery of PSO J030947.49+271757.31, the radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) at z >  6.0. It was selected by cross-matching the NRAO VLA Sky Survey and the Panoramic ...
  • Curti, Mirko; Maiolino, Roberto; Cirasuolo, Michele; Mannucci, Filippo; Williams, Rebecca J.; Auger, Matt; Mercurio, Amata; Hayden-Pawson, Connor; Cresci, Giovanni; Marconi, Alessandro; Belfiore, Francesco; Cappellari, Michele; Cicone, Claudia; Cullen, Fergus; Meneghetti, Massimo; Ota, Kazuaki; Peng, Yingjie; Pettini, Max; Swinbank, Mark; Troncoso, Paulina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We present near-infrared observations of 42 gravitationally lensed galaxies obtained in the framework of the KMOS Lensed Emission Lines and VElocity Review (KLEVER) Survey, a programme aimed at investigating the spatially ...
  • Keys, Peter H.; Reid, Aaron; Mathioudakis, Mihalis; Shelyag, Sergiy; de Jorge Henriques, Vasco Manuel; Hewitt, Rebecca L.; Del Moro, Dario; Jafarzadeh, Shahin; Jess, David B.; Stangalini, Marco (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Magnetic bright points (MBPs) are small-scale magnetic elements ubiquitous across the solar disc, with the prevailing theory suggesting that they form due to the process of convective collapse. Employing a unique full ...
  • De Pontieu, Bart Walter; Martinez-Sykora, Juan; Testa, Paola; Winebarger, Amy R.; Daw, Adrian N.; Hansteen, Viggo; Cheung, Mark C. M.; Antolin, Patrick (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The Multi-slit Solar Explorer (MUSE) is a proposed mission aimed at understanding the physical mechanisms driving the heating of the solar corona and the eruptions that are at the foundation of space weather. MUSE contains ...
  • hong, Jie; Li, Ying; Ding, M. D.; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The solar Lyα line is the strongest line in the ultraviolet waveband, and is greatly enhanced during solar flares. Here we present radiative hydrodynamic simulations of solar flares under different heating models, and ...
  • Hagala, Robert; Llinares, Claudio; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Context: There are currently no reliable methods to measure the transverse velocities of galaxies. This is an important piece of information that is lacking in galaxy catalogues, and it could allow us to probe the physics ...
  • Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; De Pontieu, Bart Walter; Rezaei, Rezza; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Solar observations with the Atacama Large Millimeter/submillimeter Array (ALMA) provide us with direct measurements of the brightness temperature in the solar chromosphere. We study the temperature distributions obtained ...
  • Herman, Daniel Christopher (Master thesis / Masteroppgave, 2019)
  • Wedemeyer, Sven; Kučinskas, Arūnas; Klevas, Jonas; Ludwig, Hans-Günter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Aims. Although observational data unequivocally point to the presence of chromospheres in red giant stars, no attempts have been made so far to model them using 3D hydrodynamical model atmospheres. We therefore compute an ...
  • Bjørgen, Johan pires; Sukhorukov, Andrii V.; Leenaarts, Jorrit; Carlsson, Mats; de la Cruz Rodriguez, Jaime; Scharmer, Göran B.; Hansteen, Viggo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Context: CHROMIS, a new imaging spectrometer at the Swedish 1-m Solar Telescope (SST), can observe the chromosphere in the H and K lines of Ca II at high spatial and spectral resolution. Accurate modeling as well as an ...
  • Stepan, J.; Trujillo Bueno, J.; Leenaarts, Jorrit; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Probing the magnetism of the upper solar chromosphere requires measuring and modeling the scattering polarization produced by anisotropic radiation pumping in UV spectral lines. Here we apply PORTA ( a novel radiative ...
  • Dahle, Håkon; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Rigby, J. R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We report fi rst results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222 + 2745, gravitationally lensed by a galaxy cluster. The time delay between A and B, the ...
  • Dyrland, Karianne (Master thesis / Masteroppgave, 2019)
  • Martinez-Sykora, Juan; De Pontieu, Bart Walter; Hansteen, Viggo; Gudiksen, Boris Vilhelm (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The properties of nonstatistical equilibrium ionization of silicon and oxygen ions are analyzed in this work. We focus on five solar targets (quiet Sun; coronal hole; plage; quiescent active region, AR; and flaring AR) as ...