S. V. H. Haugan
A5029721701- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Remote Sensing in Agriculture
- Astro and Planetary Science
- Scientific Research and Discoveries
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Impact of Light on Environment and Health
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Statistical and numerical algorithms
- Atmospheric Ozone and Climate
- CCD and CMOS Imaging Sensors
- Solar Radiation and Photovoltaics
- Advanced Vision and Imaging
- Pulsars and Gravitational Waves Research
University of Oslo
2000-2025
University College London
2024
University of Copenhagen
2024
Flatiron Health (United States)
2024
Flatiron Institute
2024
Royal Holloway University of London
2024
University of California, Davis
2024
New York University
2024
Princeton University
2024
Marconi University
2024
Euclid is an ESA mission designed to constrain the properties of dark energy and gravity via weak gravitational lensing galaxy clustering. It will carry out a wide area imaging spectroscopy survey (EWS) in visible near-infrared, covering roughly 15,000 square degrees extragalactic sky on six years. The wide-field telescope instruments are optimized for pristine PSF reduced straylight, producing very crisp images. This paper presents building reference survey: sequence pointings EWS, Deep...
The Spectral Imaging of the Coronal Environment (SPICE) instrument is a high-resolution imaging spectrometer operating at extreme ultraviolet (EUV) wavelengths. In this paper, we present concept, design, and pre-launch performance facility on ESA/NASA Solar Orbiter mission. goal paper to give prospective users better understanding possible types observations, data acquisition, sources that contribute instrument's signal. discusses science objectives, with focus SPICE-specific aspects, before...
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 provide science-ready data, are easier to work researchers whose expertise is in interpretation of data. Recently, data-processing pipelines ground-based instruments have been constructed. Aims. We aim observers a user-friendly data pipeline Swedish 1-meter Solar Telescope (SST) that delivers...
Euclid will be the first space mission to survey most of extragalactic sky in 0.95-2.02 $\mu$m range, a 5$\sigma$ point-source median depth 24.4 AB mag. This unique photometric data set find wide use beyond Euclid's core science. In this paper, we present accurate computations Y_E, J_E and H_E passbands used by Near-Infrared Spectrometer Photometer (NISP), associated system. We pay particular attention passband variations field view, accounting among others for spatially variable filter...
We investigate the importance of lensing magnification for estimates galaxy clustering and its cross-correlation with shear photometric sample Euclid. Using updated specifications, we study impact on constraints shift in estimation best fitting cosmological parameters that expect if this effect is neglected. follow prescriptions official Euclid Fisher matrix forecast analysis combination cosmic shear. The slope luminosity function (local count slope), which regulates amplitude magnification,...
Forthcoming large photometric surveys for cosmology require precise and accurate redshift (photo- z ) measurements the success of their main science objectives. However, to date, no method has been able produce photo- s at required accuracy using only broad-band photometry that those will provide. An assessment strengths weaknesses current methods is a crucial step in eventual development an approach meet this challenge. We report on performance 13 code single value estimates probability...
The combination and cross-correlation of the upcoming $Euclid$ data with cosmic microwave background (CMB) measurements is a source great expectation since it will provide largest lever arm epochs, ranging from recombination to structure formation across entire past light cone. In this work, we present forecasts for joint analysis CMB on cosmological parameters standard model some its extensions. This work expands complements recently published based $Euclid$-specific probes, namely galaxy...
We present a new infrared survey covering the three Euclid deep fields and four other calibration using Spitzer's Infrared Array Camera (IRAC). have combined these observations with all relevant IRAC archival data of in order to produce deepest possible mosaics regions. In total, represent nearly 11% total Spitzer mission time. The resulting cover approximately 71.5deg$^2$ 3.6 4.5um bands, 21.8deg$^2$ 5.8 8um bands. They reach at least 24 AB magnitude (measured sigma, 2.5 arcsec aperture)...
We present a tomographic weak lensing analysis of the Kilo Degree Survey Data Release 4 (KiDS-1000), using new pseudo angular power spectrum estimator (pseudo- C ℓ ) under development for ESA Euclid mission. Over 21 million galaxies with shape information are divided into five redshift bins, ranging from 0.1 to 1.2 in photometric redshift. measured pseudo- eight bands multipole range 76 < 1500 auto- and cross-power spectra between bins. A series tests were carried out check systematic...
Abstract The measurement of the absolute neutrino mass scale from cosmological large-scale clustering data is one key science goals Euclid mission. Such a relies on precise modelling impact neutrinos structure formation, which can be studied with N -body simulations. Here we present results major code comparison effort to establish maturity and reliability numerical methods for treating massive neutrinos. includes eleven full implementations (not all them independent), two schemes...
Euclid's photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main probe with observations of clusters is their number count, within which halo mass function (HMF) key theoretical quantity. We present new calibration analytic HMF, at level accuracy and precision required for uncertainty in this quantity subdominant respect other sources recovering parameters from Euclid counts. Our model calibrated against suite N-body simulations using...
Primordial features, in particular oscillatory signals, imprinted the primordial power spectrum of density perturbations represent a clear window opportunity for detecting new physics at high-energy scales. Future spectroscopic and photometric measurements from $Euclid$ space mission will provide unique constraints on spectrum, thanks to redshift coverage high-accuracy measurement nonlinear scales, thus allowing us investigate deviations standard power-law spectrum. We consider two models...
Aims. We validate a semi-analytical model for the covariance of real-space two-point correlation function galaxy clusters. Methods. Using 1000 PINOCCHIO light cones mimicking expected Euclid sample clusters, we calibrated simple to accurately describe clustering covariance. Then, used this quantify likelihood-analysis response variations in covariance, and investigated impact cosmology-dependent matrix at level statistics survey Results. find that Gaussian with Poissonian shot-noise does not...
Context . The future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications Einstein’s general relativity at cosmic scales. In this paper, we focus on modified gravity models characterised, linear scales, by a scale-independent growth of perturbations while featuring different testable types derivative screening mechanisms smaller non-linear Aims We considered three specific models, namely Jordan-Brans-Dicke, scalar-tensor theory with flat potential,...
Euclid is poised to survey galaxies across a cosmological volume of unprecedented size, providing observations more than billion objects distributed over third the full sky. Approximately 20 million these will have their spectroscopy available, allowing us map 3D large-scale structure Universe in great detail. This paper investigates prospects for detection cosmic voids therein and unique benefit they provide cosmology. In particular, we study imprints dynamic geometric distortions average...
The Euclid mission $-$ with its spectroscopic galaxy survey covering a sky area over $15\,000 \ \mathrm{deg}^2$ in the redshift range $0.9<z<1.8\ -$ will provide sample of tens thousands cosmic voids. This paper explores for first time constraining power void size function on properties dark energy (DE) from mock catalogue, official Flagship simulation. We identify voids light-cone, which closely matches features upcoming data set. model considering state-of-the art methodology: we rely...
This work considers which higher order modeling effects on the cosmic shear angular power spectra must be taken into account for Euclid . We identified relevant terms and quantified their individual cumulative impact cosmological parameter inferences from computed values of these using analytic expressions calculated estimations Fisher matrix formalism. reviewed 24 determined ones that potentially need to accounted for, namely: reduced approximation, magnification bias, source-lens...
Context. The Euclid space satellite mission will measure the large-scale clustering of galaxies at an unprecedented precision, providing a unique probe modifications to ΛCDM model. Aims. We investigated approximations needed efficiently predict matter and dark halos in context modified gravity exotic energy scenarios. examined normal branch Dvali–Gabadadze–Porrati model, Hu–Sawicki f ( R ) slowly evolving interacting massive neutrinos. For each, we tested for perturbative kernel...
While Euclid is an ESA mission specifically designed to investigate the nature of Dark Energy and Matter, planned unprecedented combination survey area ($\sim15\,000$ deg$^2$), spatial resolution, low sky-background, depth also make excellent space observatory for study surface brightness Universe. Scientific exploitation extended structures requires dedicated calibration procedures yet be tested. We capabilities detect structure by identifying quantifying sky background sources stray-light...
ABSTRACT Next-generation telescopes, like Euclid, Rubin/LSST, and Roman, will open new windows on the Universe, allowing us to infer physical properties for tens of millions galaxies. Machine-learning methods are increasingly becoming most efficient tools handle this enormous amount data, because they often faster more accurate than traditional methods. We investigate how well redshifts, stellar masses, star-formation rates (SFRs) can be measured with deep-learning algorithms observed...
We investigate the accuracy of perturbative galaxy bias expansion in view forthcoming analysis Euclid spectroscopic samples. compare performance a Eulerian using state-of-the-art prescriptions from effective field theory large-scale structure (EFTofLSS) with hybrid approach based on Lagrangian perturbation and high-resolution simulations. These models are benchmarked against comoving snapshots flagship I N -body simulation at z = (0.9, 1.2, 1.5, 1.8), which have been populated H α galaxies...
Data from the space telescope will enable cosmic shear measurements to be carried out with very small statistical errors, necessitating a corresponding level of systematic error control. A common approach correct for biases involves calibrating shape measurement methods using image simulations known input shear. Given their high resolution, galaxies observed (HST) can, in principle, utilised emulate observations sheared galaxy images realistic morphologies. In this work, we employ GalSim...