Browsing Institutt for teoretisk astrofysikk by Title
Now showing items 641-660 of 1279
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(Master thesis / Masteroppgave, 2019)
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
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(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, ...
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(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 ...
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(Master thesis / Masteroppgave, 2021)The CO Mapping Array Project (COMAP) is a line intensity mapping experiment currently in its Pathfinder phase, where it is targeting CO emissions at redshifts z=2.4-3.4. A main goal of the Pathfinder phase is to build a ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)With a total integration time of 168 h and a narrowband filter tuned to Lyα emission from z = 8.8, the UltraVISTA survey has set out to find some of the most distant galaxies, on the verge of the epoch of reionization. ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)Direct collapse black holes forming in pristine, atomically cooling haloes at z ≈ 10–20 may act as the seeds of supermassive black holes (BHs) at high redshifts. In order to create a massive BH seed, the host halo needs ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)© 2017. The American Astronomical Society. All rights reserved.
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)© 2017. The American Astronomical Society. All rights reserved.
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)The escape of ionizing Lyman continuum (LyC) photons requires the existence of low-NH I sightlines, which also promote escape of Lyα. We use a suite of 2500 Lyα Monte-Carlo radiative transfer simulations through models of ...