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Now showing items 601-700 of 1297
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Recent cosmic shear studies have reported discrepancies of up to 1σ on the parameter S8=σ8Ωm/0.3−−−−−−√ between the analysis of shear power spectra and two-point correlation functions, derived from the same shear catalogues. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We have discovered a 300 kpc-wide giant Lyman-α (Lyα) nebula centered on the massive galaxy group RO-1001 at z = 2.91 in the Cosmic Evolution Survey field. Keck Cosmic Web Imager observations reveal three cold gas filaments ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. Interferometric observations of the Sun with the Atacama Large Millimeter/sub-millimeter Array (ALMA) provide valuable diagnostic tools for studying the small-scale dynamics of the solar atmosphere.
Aims. The ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We have carried out the first comprehensive investigation of enhanced line emission from molecular hydrogen, H2 at 1333.79 Å, observed at flare ribbons in SOL2014-04-18T13:03. The cool H2 emission is known to be fluorescently ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. Due to their wide wavelength coverage across the millimeter to centimeter (mm–cm) range and their increased sensitivity, modern interferometric arrays facilitate observations of the thermal and non-thermal radiation ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. Metrewave solar type-III radio bursts offer a unique means to study the properties of turbulence across coronal heights. Theoretical models have shown that the apparent intensity and size of the burst sources ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We study a phenomenological class of models where dark matter converts to dark radiation in the low redshift epoch. This class of models, dubbed DMDR, characterizes the evolution of comoving dark-matter density with two ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present the first data release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA)–Arizona Radio Observatory (ARO) Survey of CO Targets (MASCOT), a European Southern Observatory public ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present and characterize the galaxy shape catalogue from the first 3 yr of Dark Energy Survey (DES) observations, over an effective area of 4143 deg2 of the southern sky. We describe our data analysis ...
(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 ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Photometric redshifts (photo- z s) are one of the main ingredients in the analysis of cosmological probes. Their accuracy particularly affects the results of the analyses of galaxy clustering with photometrically selected ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Aims. We investigate the synthetic observational signatures generated from numerical models of coronal heating in an arcade in order to determine what features are associated with such heating and what tools can be used ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Aims. We present first science observations taken during the commissioning activities of the Spectral Imaging of the Coronal Environment (SPICE) instrument on the ESA/NASA Solar Orbiter mission. SPICE is a high-resolution ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. The reconstruction of the solar spectral irradiance (SSI) on various time scales is essential for the understanding of the Earth’s climate response to the SSI variability.
Aims. The driver of the SSI variability ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. Data from ground-based, high-resolution solar telescopes can only be used for science with calibrations and processing, which requires detailed knowledge about the instrumentation. Space-based solar telescopes ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We have demonstrated that the transition region adaptive conduction (TRAC) method permits fast and accurate numerical solutions of the field-aligned hydrodynamic equations, successfully removing the influence of numerical ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We revisit the dark degeneracy that arises from the Einstein equations relating geometry to the total cosmic substratum but not resolving its individual components separately. We establish the explicit conditions for the ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Modern observatories have revealed the ubiquitous presence of magnetohydrodynamic waves in the solar corona. The propagating waves (in contrast to the standing waves) are usually originated in the lower solar atmosphere ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract Extending the electromagnetic and gravitational radiations from binary black holes with electric and magnetic charges in circular orbits in Liu et al. (Phys. Rev. D 102:103520, 2020), we calculate the total emission ...
(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, 2021)
The DES-CMASS sample (DMASS) is designed to optimally combine the weak lensing measurements from the Dark Energy Survey (DES) and redshift-space distortions (RSD) probed by the CMASS galaxy sample from the Baryonic Oscillation ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract
Using the Cosmology Large Angular Scale Surveyor, we measure the disk-averaged absolute Venus brightness temperature to be 432.3 ± 2.8 K and 355.6 ± 1.3 K in the Q and W frequency bands centered at 38.8 ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Shortly after its discovery, General Relativity (GR) was applied to predict the behavior of our Universe on the largest scales, and later became the foundation of modern cosmology. Its validity has been verified on a range ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We study the effect of the cubic torus topology of the Universe on scalar cosmological perturbations which define the gravitational potential. We obtain three alternative forms of the solution for both the gravitational ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present the statistical methods that have been developed to analyse the OzDES reverberation mapping sample. To perform this statistical analysis we have created a suite of customizable simulations ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
The Cold Spot is a puzzling large-scale feature in the Cosmic Microwave Background temperature maps and its origin has been subject to active debate. As an important foreground structure at low redshift, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We develop a novel data-driven method for generating synthetic optical observations of galaxy clusters. In cluster weak lensing, the interplay between analysis choices and systematic effects related to source galaxy ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract
A spectral line inversion code, Very Fast Inversion of the Stokes Vector (VFISV), has been used since 2010 May to infer the solar atmospheric parameters from the spectropolarimetric observations taken ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. We investigate the chromospheric counterpart of small-scale coronal loops constituting a coronal bright point (CBP) and its response to a photospheric magnetic-flux increase accompanied by co-temporal CBP heating. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. Surges are cool and dense ejections typically observed in chromospheric lines and closely related to other solar phenomena such as UV bursts or coronal jets. Even though surges have been observed for decades now, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
As the statistical power of galaxy weak lensing reaches per cent level precision, large, realistic, and robust simulations are required to calibrate observational systematics, especially given the increased importance of ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Galaxy–galaxy lensing is a powerful probe of the connection between galaxies and their host dark matter haloes, which is important both for galaxy evolution and cosmology. We extend the measurement and modelling of the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
The DMASS sample is a photometric sample from the DES Year 1 data set designed to replicate the properties of the CMASS sample from BOSS, in support of a joint analysis of DES and BOSS beyond the small overlapping area. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present morphological classifications of ∼27 million galaxies from the Dark Energy Survey (DES) Data Release 1 (DR1) using a supervised deep learning algorithm. The classification scheme separates: ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We investigate the influence of the chimney topology T×T×R of the Universe on the gravitational potential and force that are generated by point-like massive bodies. We obtain three distinct expressions for the solutions. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We use a sample of 809 photometrically classified Type Ia supernovae (SNe Ia) discovered by the Dark Energy Survey (DES) along with 40 415 field galaxies to calculate the rate of SNe Ia per galaxy in the redshift range 0.2 ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Waves and oscillations have been observed in the Sun’s atmosphere for over half a century. While such phenomena have readily been observed across the entire electromagnetic spectrum, spanning radio to gamma-ray sources, ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Recently, magnetic oscillations were detected in the chromosphere of a large sunspot and found to be linked to the coronal locations where a first ionization potential (FIP) effect was observed. In an attempt to shed light ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present in this paper one of the largest galaxy morphological classification catalogues to date, including over 20 million galaxies, using the Dark Energy Survey (DES) Year 3 data based on convolutional ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We describe the Dark Energy Survey (DES) Deep Fields, a set of images and associated multiwavelength catalogue (ugrizJHKs) built from Dark Energy Camera (DECam) and Visible and Infrared Survey Telescope ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The magnetorotational instability (MRI) is an important process in driving turbulence in sufficiently ionized accretion disks. It has been extensively studied using simulations with Eulerian grid codes, but remains fairly ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present measurements of the radial profiles of the mass and galaxy number density around Sunyaev–Zel’dovich (SZ)-selected clusters using both weak lensing and galaxy counts. The clusters are selected ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Future ground-based telescopes, such as the 4-metre class facilities DKIST and EST, will dramatically improve on current capabilities for simultaneous multi-line polarimetric observations in a wide range of wavelength ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
The analysis of current and future cosmological surveys of Type Ia supernovae (SNe Ia) at high redshift depends on the accurate photometric classification of the SN events detected. Generating realistic ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
Determining the distribution of redshifts of galaxies observed by wide-field photometric experiments like the Dark Energy Survey (DES) is an essential component to mapping the matter density field with ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present DES14X2fna, a high-luminosity, fast-declining Type IIb supernova (SN IIb) at redshift z = 0.0453, detected by the Dark Energy Survey (DES). DES14X2fna is an unusual member of its class, with ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
Quantifying tensions – inconsistencies amongst measurements of cosmological parameters by different experiments – has emerged as a crucial part of modern cosmological data analysis. Statistically significant ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We present reconstructed convergence maps, mass maps, from the Dark Energy Survey (DES) third year (Y3) weak gravitational lensing data set. The mass maps are weighted projections of the density field ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We report new Northern Extended Millimeter Array observations of the [C ii]158 μm, [N ii]205 μm, and [O i]146 μm atomic fine structure lines (FSLs) and dust continuum emission of J1148+5251, a z = 6.42 quasar, which probe ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We search for the signature of parity-violating physics in the cosmic microwave background, called cosmic birefringence, using the Planck data release 4. We initially find a birefringence angle of β=0.30°±0.11° (68% C.L.) ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
The umbral regions of sunspots and pores in the solar photosphere are generally dominated by 3 mHz oscillations, which are due to p -modes penetrating the magnetic region. In these locations, wave power is also significantly ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Context. At present, an exponential growth in scientific data from current and upcoming solar observatories is expected. Most of the data consist of high spatial and temporal resolution cubes of Stokes profiles taken in ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract As a frequent and energetic particle accelerator, our Sun provides us with an excellent astrophysical laboratory for understanding the fundamental process of particle acceleration. The exploitation of radiative ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We present a constraint on the tensor-to-scalar ratio, r, derived from measurements of cosmic microwave background (CMB) polarization B-modes with “delensing,” whereby the uncertainty on r contributed by the sample variance ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
The Wide-Area Linear Optical Polarimeter (WALOP)-South instrument will be mounted on the 1-m South African Astronomical Observatory telescope in South Africa as part of the Polar-Areas Stellar Imaging Polarization High ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Abstract This paper outlines the science case for line-intensity mapping with a space-borne instrument targeting the sub-millimeter (microwaves) to the far-infrared (FIR) wavelength range. Our goal is to observe and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We present the first linear polarization measurements from the 2015 long-duration balloon flight of Spider, which is an experiment that is designed to map the polarization of the cosmic microwave background (CMB) on degree ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
The calibration and validation of scientific analysis in simulations is a fundamental tool to ensure unbiased and robust results in observational cosmology. In particular, mock galaxy catalogs are a crucial resource to ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Reverberation mapping is a robust method to measure the masses of supermassive black holes outside of the local Universe. Measurements of the radius–luminosity (R−L) relation using the Mg ii emission line are critical for ...
Fast generation of realistic SZ maps using machine learning methods Restricted Access
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Context. Heating signatures from small-scale magnetic reconnection events in the solar atmosphere have proven to be difficult to detect through observations. Numerical models that reproduce flaring conditions are essential ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We describe and test the fiducial covariance matrix model for the combined two-point function analysis of the Dark Energy Survey Year 3 (DES-Y3) data set. Using a variety of new ansatzes for covariance modelling and testing, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
ABSTRACT
We perform an analysis in harmonic space of the Dark Energy Survey Year 1 Data (DES-Y1) galaxy clustering photometric data using products obtained for the real-space analysis. We test our pipeline with ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
In this paper, we present and validate the galaxy sample used for the analysis of the baryon acoustic oscillation (BAO) signal in the Dark Energy Survey (DES) Y3 data. The definition is based on a colour and redshift-dependent ...
(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, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background expansion and linear perturbations, to ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
ABSTRACT
Photometric data can be analysed using the 3D correlation function ξp to extract cosmological information via e.g. measurement of the Baryon Acoustic Oscillations (BAO). Previous studies modeled ξp ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We introduce COMAP-EoR, the next generation of the Carbon Monoxide Mapping Array Project aimed at extending CO intensity mapping to the Epoch of Reionization. COMAP-EoR supplements the existing 30 GHz COMAP Pathfinder with ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The combination and cross-correlation of the upcoming Euclid data with cosmic microwave background (CMB) measurements is a source of great expectation since it will provide the largest lever arm of epochs, ranging from ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In December 2016, the Atacama Large Millimeter/submillimeter Array (ALMA) carried out the first regular observations of the Sun. These early observations and the reduction of the respective data posed a challenge due to ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The electromagnetic energy flux in the lower atmosphere of the Sun is a key tool to describe the energy balance of the solar atmosphere. Current investigations on energy flux in the solar atmosphere focus primarily on the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
ABSTRACT
In non-linear scales, the matter density distribution is not Gaussian. Consequently, the widely used two-point correlation function is not adequate anymore to capture the matter density field’s entire ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We present the results of an analysis of Wide-field Infrared Survey Explorer (WISE) observations of the full 2500 deg2 South Pole Telescope (SPT)-Sunyaev–Zel'dovich cluster sample. We describe a process for identifying ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Modern cosmic microwave background (CMB) analysis pipelines regularly employ complex time-domain filters, beam models, masking, and other techniques during the production of sky maps and their corresponding angular power ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We present CO(2−1) and adjacent continuum observations of seven nearby radio-quiet type-2 quasars (QSO2s) obtained with ALMA at ∼0.2″ resolution (370 pc at z ∼ 0.1). These QSO2s are luminous ( L [OIII] > 10 8.5 L ⊙ ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Context. The standard cosmological model is based on the fundamental assumptions of a spatially homogeneous and isotropic universe on large scales. An observational detection of a violation of these assumptions at any ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We quantify evolution in the cluster-scale stellar mass–halo mass (SMHM) relation's parameters using 2323 clusters and brightest central galaxies (BCGs) over the redshift range 0.03 ≤ z ≤ 0.60. The precision on the inferred ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
An accurate covariance matrix is essential for obtaining reliable cosmological results when using a Gaussian likelihood. In this paper we study the covariance of pseudo- C ℓ estimates of tomographic cosmic shear power ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Current state-of-the-art spectrographs cannot resolve the fundamental spatial (subarcseconds) and temporal (less than a few tens of seconds) scales of the coronal dynamics of solar flares and eruptive phenomena. The ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
We consider the recently proposed possibility that dark energy (DE) and baryons may scatter through a pure momentum exchange process, leaving the background evolution unaffected. Earlier work has shown ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We report the combined results of eight searches for strong gravitational lens systems in the full 5000 square degrees of Dark Energy Survey (DES) observations. The observations accumulated by the end of the third observing ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We present a search for outer solar system objects in the 6 yr of data from the Dark Energy Survey (DES). The DES covered a contiguous 5000 deg2 of the southern sky with ≈80,000 3 deg2 exposures in the grizY filters between ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Context. The ESA Euclid mission will produce photometric galaxy samples over 15 000 square degrees of the sky that will be rich for clustering and weak lensing statistics. The accuracy of the cosmological constraints derived ...
(Doctoral thesis / Doktoravhandling, 2022)
The Cosmic Microwave Background (CMB) radiation is the oldest signal in the universe. It teaches us about the first moments after the universe came into existence, and thus informs us about its subsequent evolution.
The ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Aims. We investigate the atmospheric response to coronal heating driven by random velocity fields with different characteristic time scales and amplitudes.
Methods. We conducted a series of three-dimensional magnetohydrodynamic ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Euclid is poised to survey galaxies across a cosmological volume of unprecedented size, providing observations of more than a billion objects distributed over a third of the full sky. Approximately 20 million of these ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
ABSTRACT
We present the first observation of a solar prominence at 84 − 116 GHz using the high resolution interferometric imaging of ALMA. Simultaneous observations in Hα from Białkaw Observatory and with SDO/AIA ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We present a new infrared survey covering the three Euclid deep fields and four other Euclid calibration fields using Spitzer Space Telescope’s Infrared Array Camera (IRAC). We combined these new observations with all ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Thermal instability is a fundamental process of astrophysical plasmas. It is expected to occur whenever the cooling is dominated by radiation and cannot be compensated for by heating. In this work, we conduct 2.5D radiation ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The Euclid mission will conduct an extragalactic survey over 15 000 deg 2 of the extragalactic sky. The spectroscopic channel of the Near-Infrared Spectrometer and Photometer (NISP) has a resolution of R ~ 450 for its blue ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
This work analyzes the Hall magnetohydrodynamics (HMHD) and magnetohydrodynamics (MHD) numerical simulations of a flaring solar active region as a test bed while idealizing the coronal Alfvén speed to be less by two orders ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Redshifted components of chromospheric emission lines in the hard X-ray impulsive phase of solar flares have recently been studied through their 30 s evolution with the high resolution of the Interface Region Imaging ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We use 6 yr of data from the Dark Energy Survey to perform a detailed photometric characterization of the Phoenix stellar stream, a 15° long, thin, dynamically cold, low-metallicity stellar system in the Southern Hemisphere. ...
(Master thesis / Hovedoppgave, 1999)