Browsing Institutt for teoretisk astrofysikk by Title
Now showing items 400-419 of 1278
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)We present a machine learning framework to simulate realistic galaxies for the Euclid Survey, producing more complex and realistic galaxies than the analytical simulations currently used in Euclid . The proposed method ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Aims. We investigate the importance of lensing magnification for estimates of galaxy clustering and its cross-correlation with shear for the photometric sample of Euclid . Using updated specifications, we study the impact ...
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Euclid preparation: XV. Forecasting cosmological constraints for the Euclid and CMB joint analysis (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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Context. While Euclid is an ESA mission specifically designed to investigate the nature of dark energy and dark matter, the planned unprecedented combination of survey area (∼15 000 deg 2 ), spatial resolution, low ...
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(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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Context. The Euclid mission is expected to discover thousands of z > 6 galaxies in three deep fields, which together will cover a ∼50 deg 2 area. However, the limited number of Euclid bands (four) and the low availability ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)The Euclid Space Telescope will provide deep imaging at optical and near-infrared wavelengths, along with slitless near-infrared spectroscopy, across ~15 000deg 2 of the sky. Euclid is expected to detect ~12 billion ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Euclid ’s photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main cosmological probe with observations of clusters is their number count, within which the halo mass function ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Material outgassing in a vacuum leads to molecular contamination, a well-known problem in spaceflight. Water is the most common contaminant in cryogenic spacecraft, altering numerous properties of optical systems. Too much ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)The European Space Agency's Euclid mission will provide high-quality imaging for about 1.5 billion galaxies. A software pipeline to automatically process and analyse such a huge amount of data in real time is being developed ...
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(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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Recent cosmic shear studies have shown that higher-order statistics (HOS) developed by independent teams now outperform standard two-point estimators in terms of statistical precision thanks to their sensitivity to the ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)This work focusses on the pilot run of a simulation campaign aimed at investigating the spectroscopic capabilities of the Euclid Near-Infrared Spectrometer and Photometer (NISP), in terms of continuum and emission line ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)The technique of photometric redshifts has become essential for the exploitation of multi-band extragalactic surveys. While the requirements on photometric redshifts for the study of galaxy evolution mostly pertain to the ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)Forthcoming imaging surveys will increase the number of known galaxy-scale strong lenses by several orders of magnitude. For this to happen, images of billions of galaxies will have to be inspected to identify potential ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)Context. The cosmological surveys that are planned for the current decade will provide us with unparalleled observations of the distribution of galaxies on cosmic scales, by means of which we can probe the underlying ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)Aims. We validate a semi-analytical model for the covariance of the real-space two-point correlation function of galaxy clusters. Methods. Using 1000 PINOCCHIO light cones mimicking the expected Euclid sample of galaxy ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Cosmological constraints from key probes of the Euclid imaging survey rely critically on the accurate determination of the true redshift distributions, n ( z ), of tomographic redshift bins. We determine whether the mean ...
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Euclid: Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)In physically realistic, scalar-field-based dynamical dark energy models (including, e.g., quintessence), one naturally expects the scalar field to couple to the rest of the model’s degrees of freedom. In particular, a ...
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(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 ...