Now showing items 54-73 of 735

  • Ninive, Per Harald (Master thesis / Masteroppgave, 2009)
    En mulig forklaring på at universet gikk inn i en fase av akselerert ekspansjon for 5-6 milliarder år siden, er at energitettheten i universet inneholder et bidrag fra et dynamisk skalarfelt. Problemet med denne forklaringen ...
  • Winther, Hans Arnold (Master thesis / Masteroppgave, 2010)
    We investigate scalar-field theories with a field-dependent coupling to matter and show the existence of a chameleon mechanism. The thin-shell solutions for a spherical body are found, and used to investigate the consequences ...
  • Zhang, B; David, L. P.; Jones, C.; Andrade-Santos, F.; O'Sullivan, E.; Dahle, Håkon; Nulsen, P. E. J.; Clarke, T. E.; Pointecouteau, E; Pratt, G. W.; Arnaud, M.; Vrtilek, J. M.; Ji, L.; van Weeren, R. J.; Kraft, R. P.; Kong, X. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We present Chandra and XMM-Newton observations of PLCK G036.7+14.9 from the Chandra–Planck Legacy Program. The high resolution X-ray observations reveal two close (~72'' = 193 kpc in projection) subclusters, G036N and ...
  • Giles, P. A.; Maughan, B. J.; Dahle, Håkon; Bonamente, M.; Landry, D.; Jones, C.; Joy, M.; Murray, S. S.; van der Pyl, N. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We present the results of work involving a statistically complete sample of 34 galaxy clusters, in the redshift range 0.15 ≤ z ≤ 0.3 observed with Chandra. We investigate the luminosity–mass (LM) relation for the cluster ...
  • Bose, Souvik; de Jorge Henriques, Vasco Manuel; Joshi, Jayant; Rouppe van der Voort, Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We characterize, for the first time, type-II spicules in Ca II K 3934 Å using the CHROMIS instrument at the Swedish 1 m Solar Telescope. We find that their line formation is dominated by opacity shifts with the K3 minimum ...
  • Eklund, Henrik; Wedemeyer, Sven; Snow, Ben; Jess, David B.; Jafarzadeh, Shahin; Grant, Samuel D. T.; Carlsson, Mats; Szydlarski, Mikolaj Marcin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Observations at millimetre wavelengths provide a valuable tool to study the small-scale dynamics in the solar chromosphere. We evaluate the physical conditions of the atmosphere in the presence of a propagating shock wave ...
  • Christiansen, Øyvind (Master thesis / Masteroppgave, 2020)
    Gravitational waveforms from mergers or close-encounters of astrophysical compact bodies provide a new and separate window into high energy physics and dark objects. Although there is a zoo of theoretical compact objects ...
  • Christiansen, Øyvind; Jiménez, Jose Beltrán; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    We consider the inspiral of black holes carrying U(1) charge that is not electromagnetic, but corresponds to some dark sector. In the weak-field, low-velocity regime, the components follow Keplerian orbits. We investigate ...
  • Hansen, Terese T.; Marshall, Jennifer L.; Simon, J. D.; Li, Ting S.; Bernstein, R. A.; Pace, A. B.; Ferguson, P.; Nagasawa, D. Q.; Kuehn, Kyler; Carollo, Daniela; Geha, Marla; James, David; Walker, Alistair; Diehl, H. T.; Aguena, M.; Allam, S.; Avila, S.; Bertin, E.; Brooks, David; Buckley-Geer, E.; Burke, David L.; Carnero Rosell, A.; Carrasco Kind, Matias; Carretero, J.; Costanzi, M.; Da Costa, L. N.; Desai, S.; De Vicente, J.; Doel, P.; Eckert, Kathleen; Eifler, T. F.; Everett, S.; Ferrero, Ismael; Frieman, J.; García-Bellido, Juan; Gaztanaga, E.; Gerdes, David W.; Gruen, Daniel; Gruendl, Robert A.; Gschwend, J.; Gutierrez, G.; Hinton, Samuel R.; Hollowood, Devon L.; Honscheid, K.; Kuropatkin, N.; Maia, M. A. G.; March, M.; Miquel, Ramon; Palmese, Antonella; Paz-Chinchón, Francisco; Plazas, Andrés A.; Sanchez, E.; Santiago, B.; Scarpine, V.; Serrano, S.; Smith, Mathew; Soares-Santos, Marcelle; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Varga, T. N.; Wilkinson, R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • Shen, Sijing; Kulkarni, Girish; Madau, Piero; Mayer, Lucio (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Using the Eris zoom-in cosmological simulation of assembly of a Milky Way analogue, we study the chemical enrichment of stars due to accretion of metal-enriched gas from the interstellar medium (ISM) during the Galaxy's ...
  • Mendes Domingos Pereira, Tiago; Rouppe van der Voort, Luc; Hansteen, Viggo; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Low-lying loops have been discovered at the solar limb in transition region temperatures by the Interface Region Imaging Spectrograph (IRIS). They do not appear to reach coronal temperatures, and it has been suggested that ...
  • Van Damme, H. J.; de Moortel, Ineke; Pagano, P.; Johnston, Craig D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Phase mixing of Alfvén waves has been studied extensively as a possible coronal heating mechanism but without the full thermodynamic consequences considered self-consistently. It has been argued that in some cases, ...
  • Gošić, Milan; de la Cruz Rodriguez, Jaime; De Pontieu, Bart Walter; Bellot Rubio, L. R.; Carlsson, Mats; Esteban Pozuelo, S.; Ortiz, Ada; Polito, Vanessa (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The heating of the solar chromosphere remains one of the most important questions in solar physics. Our current understanding is that small-scale internetwork (IN) magnetic fields play an important role as a heating agent. ...
  • Leenarts, Jorrit; de la Cruz Rodriguez, Jaime; Danilovic, Sanja; Scharmer, Göran B.; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Context: The radiative losses in the solar chromosphere vary from 4 kW m−2 in the quiet Sun, to 20 kW m−2 in active regions. The mechanisms that transport non-thermal energy to and deposit it in the chromosphere are still ...
  • Reid, A.; de Jorge Henriques, Vasco Manuel; Mathioudakis, M.; Doyle, J. G.; Ray, T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We use spectropolarimetric observations of the Ca ii 8542 Å line, taken from the Swedish 1 m Solar Telescope, in an attempt to recover dynamic activity in a micro-flaring region near a sunspot via inversions. These inversions ...
  • Drews, Ainar (Master thesis / Masteroppgave, 2014)
    In this thesis chromospheric features called Penumbral Microjets (PMJs) are investigated in a sunspot. Observations of high resolution in space, time and wavelength from the Swedish 1-meter Solar Telescope (SST) are used ...
  • Bharti, L.; Sobha, B.; Quintero Noda, Carlos; Joshi, C.; Pandya, U. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    ABSTRACT We present high spatial resolution observations of short-lived transients, ribbons and jet-like events above a pore in Ca ii H images where fine structure, like umbral dots, light bridges and penumbral ...
  • Quintero Noda, C.; Shimizu, T.; Katsukawa, Y.; de la Cruz Rodriguez, Jaime; Carlsson, Mats; Anan, T.; Oba, T.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Future solar missions and ground-based telescopes aim to understand the magnetism of the solar chromosphere. We performed a supporting study in Quintero Noda et al. focused on the infrared Ca ii 8542 Å line and we concluded ...
  • Quintero Noda, C.; Kato, Yoshiaki; Katsukawa, Y.; Oba, T.; de la Cruz Rodriguez, Jaime; Carlsson, Mats; Shimizu, T.; Orozco Suarez, D.; Ruiz Cobo, B.; Kubo, M.; Anan, T.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Future solar missions and ground-based telescopes aim to understand the magnetism of the solar chromosphere. We performed a supporting study in Quintero Noda et al. focused on the infrared Ca ii 8542 Å line and we concluded ...
  • Quintero Noda, Carlos; Iijima, H.; Katsukawa, Y.; Shimizu, T.; Carlsson, Mats; de la Cruz Rodriguez, Jaime; Ruiz Cobo, B.; Orozco Suarez, D.; Oba, T.; Anan, T.; Kubo, M.; Kawabata, Y.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We investigate the diagnostic potential of the spectral lines at 850 nm for understanding the magnetism of the lower atmosphere. For that purpose, we use a newly developed 3D simulation of a chromospheric jet to check the ...