Browsing Institutt for teoretisk astrofysikk by Title

Now showing items 724-743 of 1278

  • Molecular gas budget and characterization of intermediate-mass star-forming galaxies at z ≈ 2-3 
    Solimano, M.; González-López, J.; Barrientos, L.F.; Aravena, M.; López, S.; Tejos, N.; Sharon, K.; Dahle, H.; Bayliss, M.; Ledoux, C.; Rigby, J.R.; Gladders, M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Star-forming galaxies (SFGs) with stellar masses below 10 10   M ⊙ make up the bulk of the galaxy population at z  > 2. The properties of the cold gas in these galaxies can only be probed in very deep observations or ...
  • The Molecular Gas in the NGC 6240 Merging Galaxy System at the Highest Spatial Resolution 
    Treister, Ezequiel; Messias, Hugo; Privon, George C.; Nagar, Neil; Medling, Anne M.; U, Vivian; Bauer, Franz E.; Cicone, Claudia; Barcos Muñoz, Loreto; Evans, Aaron S.; Muller-Sanchez, Francisco; Comerford, Julia M.; Armus, Lee; Chang, Chin-Shin; Koss, Michael; Venturi, Giacomo; Schawinski, Kevin; Casey, Caitlin; Urry, C. Megan; Sanders, David B.; Scoville, Nicholas; Sheth, Kartik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present the highest-resolution—15 pc (0farcs03)—ALMA 12CO(2–1) line emission and 1.3 mm continuum maps, tracers of the molecular gas and dust, respectively, in the nearby merging galaxy system NGC 6240, which hosts two ...
  • Molecular gas kinematics in the nuclear region of nearby Seyfert galaxies with ALMA 
    Bewketu Belete, A.; Andreani, Paola; Fernández-Ontiveros, J. A.; Hatziminaoglou, Evanthia; Combes, Françoise; Sirressi, Mattia; Slater, R.; Ricci, C.; Dasyra, K.; Cicone, Claudia; Aalto, S.; Spinoglio, L.; Imanishi, M.; De Medeiros, J. R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Context. The study of the distribution, morphology, and kinematics of cold molecular gas in the nuclear and circumnuclear regions of active galactic nuclei (AGNs) helps to characterise and hence to quantify the impact of ...
  • Molecular outflows in local galaxies: Method comparison and a role of intermittent AGN driving 
    Lutz, Dieter; Sturm, E.; Janssen, A.; Veilleux, S.; Aalto, S.; Cicone, Claudia; Contursi, A.; Davies, R. I.; Feruglio, C.; Fischer, J.; Fluetsch, A.; Garcia-Burillo, S.; Genzel, Reinhard; González-Alfonso, E.; Graciá-Carpio, J.; Herrera-Camus, R.; Maiolino, Roberto; Schruba, A.; Shimizu, T.; Sternberg, A.; Tacconi, L. J.; Weiß, A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We report new detections and limits from a NOEMA and ALMA CO(1-0) search for molecular outflows in 13 local galaxies with high far-infrared surface brightness, and combine these with local universe CO outflow results from ...
  • Monopole and dipole estimation for multi-frequency sky maps by linear regression 
    Wehus, Ingunn Kathrine; Fuskeland, Unni; Eriksen, Hans Kristian Kamfjord; Banday, Anthony J.; Dickinson, Clare F.; Ghosh, Tuhin Subhra; Górski, Krzysztof M.; Lawrence, Cecil R.; Leahy, J. Patrick; Maino, Davide Biagi; Reich, Patricia; Reich, Wolfgang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We describe a simple but efficient method for deriving a consistent set of monopole and dipole corrections for multi-frequency sky map data sets, allowing robust parametric component separation with the same data set. The ...
  • Morphological Properties of Slender Ca II H Fibrils Observed by SUNRISE II 
    Gafeira, Ricardo; Lagg, A.; Solanki, S. K.; Jafarzadeh, Shahin; van Noort, M.; Barthol, P.; Blanco Rodriguez, J.; del Toro Iniesta, J. C.; Gandorfer, A.; Gizon, L; Hirzberger, J.; Knölker, M.; Orozco Suarez, D.; Riethmüller, T. L.; Schmidt, W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We use seeing-free high spatial resolution Ca ii H data obtained by the Sunrise observatory to determine properties of slender fibrils in the lower solar chromosphere. In this work we use intensity images taken with the ...
  • Multi-component Decomposition of Astronomical Spectra by Compressed Sensing 
    Cheung, Mark C. M.; De Pontieu, Bart Walter; Martinez-Sykora, Juan; Testa, Paola; Winebarger, Amy R.; Daw, Adrian N.; Hansteen, Viggo; Antolin, Patrick; Tarbell, Theodore D.; Wüelser, Jean Pierre; Young, Peter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The signal measured by an astronomical spectrometer may be due to radiation from a multi-component mixture of plasmas with a range of physical properties (e.g., temperature, Doppler velocity). Confusion between multiple ...
  • Multi-layer observations of sunspot waves at high resolution 
    Chamandy, Tiffany Marie (Master thesis / Masteroppgave, 2018)
  • A MULTI-LEVEL SOLVER FOR GAUSSIAN CONSTRAINED COSMIC MICROWAVE BACKGROUND REALIZATIONS 
    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 ...
  • The multi-phase baryon cycle in a local infrared-luminous galaxy merger 
    Fredborg, Eirik Elias Prydz (Master thesis / Masteroppgave, 2022)
  • Multi-resolution Bayesian CMB component separation through Wiener filtering with a pseudo-inverse preconditioner 
    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 ...
  • Multi-scale observations of thermal non-equilibrium cycles in coronal loops 
    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 ...
  • THE MULTI-THERMAL and MULTI-STRANDED NATURE of CORONAL RAIN 
    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 ...
  • Multi-tracer molecular gas observations of local infrared luminous galaxies 
    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 ...
  • Multi-wavelength observations of magnetic bright points (MBPs) in the lower solar atmosphere 
    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 ...
  • Multichannel autocalibration for the Atmospheric Imaging Assembly using machine learning 
    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 ...
  • Multifluid Simulation of Solar Chromospheric Turbulence and Heating Due to Thermal Farley-Buneman Instability 
    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 ...
  • Multifluid Simulations of Upper-chromospheric Magnetic Reconnection with Helium-Hydrogen Mixture 
    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 ...
  • Multiwavelength High-resolution Observations of Chromospheric Swirls in the Quiet Sun 
    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 ...
  • Multiwavelength optical and NIR variability analysis of the Blazar PKS 0027-426 
    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 ...