Browsing Institutt for teoretisk astrofysikk by Title
Now showing items 610-629 of 1243
-
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)We present a conceptual study of a large format imaging spectrograph for next-generation large (50-m class) single-dish telescopes, i.e., the Large Submillimeter Telescope (LST) and Atacama Large Aperture Submillimeter ...
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Abstract Although theoretically predicted, the simultaneous excitation of several resonant modes in sunspots has not been observed. Like any harmonic oscillator, a solar magnetic flux tube can support a variety of resonances, ...
-
(Doctoral thesis / Doktoravhandling, 2023)Massive neutrinos and alternative theories of gravity are two seemingly different aspects of cosmological study. On one hand, we have actual particles known to exist, and on the other, a proposed change to the description ...
-
(Master thesis / Masteroppgave, 2016)If dark matter, after it has become non-relativistic, scatters elastically with a relativistic heat bath particle, then the resulting pressure leads to acoustic oscillations that suppress the growth of overdensities in the ...
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)We present Hubble Space Telescope (HST) imaging and grism spectroscopy of a strongly lensed LIRG at z = 0.816, SGAS 143845.1+145407, and use the magnification boost of gravitational lensing to study the distribution of ...
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)SDSS J2222+2745 is a galaxy cluster at z = 0.49, strongly lensing a quasar at z = 2.805 into six widely separated images. In recent Hubble Space Telescope imaging of the field, we identify additional multiply lensed galaxies ...
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)ABSTRACT Lensing without borders is a cross-survey collaboration created to assess the consistency of galaxy–galaxy lensing signals (ΔΣ) across different data sets and to carry out end-to-end tests of systematic ...
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)ABSTRACT We compare the two largest galaxy morphology catalogues, which separate early- and late-type galaxies at intermediate redshift. The two catalogues were built by applying supervised deep learning ...
-
(Master thesis / Masteroppgave, 2015)In 2013 a new metric called TARDIS was introduced. This metric was published by Tippet and Tsang, and described a time machine. This thesis uses numerical methods to explore properties of this new metric. We start by ...
-
(Doctoral thesis / Doktoravhandling, 2023)The theme of this thesis has been the use of forward modeling to study the formation of spectral lines in the solar atmosphere, with a particular focus on the chromospheric Ca II 854.2 nm line which is important for magnetic ...
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Context. Ellerman bombs (EBs) and UV bursts are small-scale reconnection events that occur in the region of the upper photosphere to the chromosphere. It has recently been discovered that these events can have emission ...
-
(Master thesis / Masteroppgave, 2019)
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)We present detailed characteristics of linear polarization features (LPFs) in the quiet-Sun photosphere from high-resolution observations obtained with SUNRISE/IMaX. We explore differently treated data with various noise ...
-
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)Our understanding of the formation and evolution of the corona and the heliosphere is linked to our capability of properly interpret the data from remote sensing and in-situ observations. In this respect, being able to ...
-
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)We consider two stable Interacting Dark Matter-Dark Energy models and confront them against current Cosmic Microwave Background data from the Planck satellite. We then generate luminosity distance measurements from Script ...
-
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. JAXA selected LiteBIRD ...
-
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
-
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)Cosmological local observables are at best statistically determined by the fundamental theory describing inflation. When the scalar inflaton is coupled uniformly to a collection of subdominant massless gauge vectors, ...
-
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array observing the Cosmic Microwave Background (CMB) at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures the CMB polarization on the ...