A5069652171- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Remote Sensing in Agriculture
- Astrophysical Phenomena and Observations
- Statistical and numerical algorithms
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
- CCD and CMOS Imaging Sensors
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Impact of Light on Environment and Health
- Spectroscopy and Chemometric Analyses
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2011-2025
University of the Western Cape
2014-2025
University of Turin
2011-2025
Osservatorio Astrofisico di Torino
2018-2025
National Institute for Astrophysics
2018-2025
University College London
2024
University of Copenhagen
2024
Flatiron Health (United States)
2024
Flatiron Institute
2024
Royal Holloway University of London
2024
Abstract We present a detailed overview of the cosmological surveys that we aim to carry out with Phase 1 Square Kilometre Array (SKA1) and science they will enable. highlight three main surveys: medium-deep continuum weak lensing low-redshift spectroscopic HI galaxy survey over 5 000 deg 2 ; wide deep intensity mapping (IM) 20 from $z = 0.35$ 3; deep, high-redshift IM 100 3$ 6. Taken together, these achieve an array important scientific goals: measuring equation state dark energy \sim...
The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct expansion history Universe growth cosmic structures. Estimation expected performance experiment, in terms predicted constraints on cosmological parameters, has so far relied different methodologies numerical implementations, developed for observational probes their combination. In this paper we present validated forecasts, that combine both theoretical expertise probes. This is presented provide...
We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), fast and accurate predictor for nonlinear correction matter power spectrum. Percent-level emulation is now supported in eight-dimensional parameter space $w_0w_a$CDM$+\sum m_\nu$models between redshift $z=0$ $z=3$ spatial scales within range 0.01 $h$/Mpc $\leq k \leq$ 10 $h$/Mpc. In order to achieve this level accuracy, we have had improve quality underlying N-body simulations used as training data: (1) use...
Abstract We present results from MeerKAT single-dish H i intensity maps, the final observations to be performed in L-band Large Area Synoptic Survey (MeerKLASS) campaign. The represent deepest maps date, produced 41 repeated scans over $236\, \deg ^2$, providing 62 hours of observational data for each 64 dishes before flagging. By introducing an iterative self-calibration process, estimated thermal noise reconstructed is limited ∼ 1.21 mK (1.2 × theoretical level). This will sub-dominant...
HI intensity mapping (IM) is a novel technique capable of the large-scale structure Universe in three dimensions and delivering exquisite constraints on cosmology, by using as biased tracer dark matter density field.This achieved measuring redshifted 21cm line over sky range redshifts without requirement to resolve individual galaxies.In this chapter, we investigate potential SKA1 deliver maps broad frequencies substantial fraction sky.By pinning down baryon acoustic oscillation redshift...
The Square Kilometre Array (SKA) will produce spectroscopic surveys of tens to hundreds millions neutral hydrogen (H I) galaxies, eventually covering 30 000 deg2 and reaching out redshift z≳2. huge volumes probed by the SKA allow for some best constraints on primordial non-Gaussianity, based measurements large-scale power spectrum.We investigate various observational set-ups HI galaxy surveys, compatible with Phase 1 2 (full SKA) configurations.We use corresponding number counts bias each...
Next-generation cosmological surveys will probe ever larger volumes of the universe, including largest scales, near and beyond horizon. On these galaxy power spectrum carries signatures local primordial non-Gaussianity (PNG) horizon-scale general relativistic (GR) effects. However, cosmic variance limits detection Combining different via multi-tracer method allows us to reduce effect variance. This benefits from large bias differences between two tracers underlying dark matter distribution,...
Abstract The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over wide range of frequencies, and with an order magnitude greater sensitivity survey speed than any current telescope. SKA will address many important topics in astronomy, ranging from planet formation distant galaxies. However, this work, we consider the perspective as facility for studying physics. We review four areas which expected make major contributions our understanding fundamental...
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,...
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 the non-Gaussian features large-scale structure. The aim Higher-Order Weak Lensing Statistics (HOWLS) project is assess, compare, and combine constraining power ten different HOS on a common set $Euclid$-like mocks, derived from N-body simulations. In this first paper HOWLS series,...
Abstract The power spectrum and bispectrum of dark matter tracers are key complementary probes the Universe. Next-generation surveys will deliver good measurements bispectrum, opening door to improved cosmological constraints breaking parameter degeneracies, from combination bispectrum. Multi-tracer spectra have been used suppress cosmic variance mitigate effects nuisance parameters systematics. We present a multi-tracer formalism that can be applied next-generation survey data. Then we...
This paper presents the specification, design, and development of Visible Camera (VIS) on European Space Agency's mission. VIS is a large optical-band imager with field view 0.54 deg$^2$ sampled at an array 609 Megapixels spatial resolution . It will be used to survey approximately 14 000 extragalactic sky measure distortion galaxies in redshift range $z=0.1$--1.5 resulting from weak gravitational lensing, one two principal cosmology probes leveraged by With photometric redshifts,...
We investigate the ability of Euclid telescope to detect galaxy-scale gravitational lenses. To do so, we perform a systematic visual inspection $0.7\,\rm{deg}^2$ ERO data towards Perseus cluster using both high-resolution VIS $I_{\scriptscriptstyle\rm E}$ band, and lower resolution NISP bands. inspect every extended source brighter than magnitude $23$ in with $41$ expert human classifiers. This amounts $12\,086$ stamps $10^{\prime\prime}\,\times\,10^{\prime\prime}$. find $3$ grade A $13$ B...
will provide deep near-infrared (NIR) imaging to ∼26.5 AB magnitude over ∼59 deg^2 in its and auxiliary fields. The Cosmic DAWN survey combines dedicated archival UV--NIR observations matched depth multiwavelength of the consistently measured NIR-selected photometric catalogues, accurate redshifts, measurements galaxy properties a redshift z∼ 10. catalogues include Spitzer IRAC data that are critical for stellar mass at z ≳ 2.5 high-z science. These complement standard which not data. In...
To date, galaxy image simulations for weak lensing surveys usually approximate the light profiles of all galaxies as a single or double Sérsic profile, neglecting influence substructures and morphologies deviating from such simplified parametric characterisation. While this approximation may be sufficient previous data sets, stringent cosmic shear calibration requirements high quality in upcoming survey demand consideration effects that realistic irregular shapes have on measurement biases....
We make use of the unprecedented depth, spatial resolution, and field view Early Release Observations (EROs) Perseus galaxy cluster to detect characterise dwarf population in this massive system. Using a dedicated annotation tool, high-resolution VIS combined VIS+Near Infrared Spectrometer Photometer (NISP) colour images were visually inspected candidates identified. Their morphologies, presence nuclei, their globular (GC) richness assessed, complementing an automatic detection GC...
The large-scale structure of the Universe supplies crucial information about physical processes at play early times. Unresolved maps intensity 21 cm emission from neutral hydrogen HI redshifts $z\ensuremath{\simeq}1--5$ are best hope accessing ultralarge-scale information, directly related to Universe. A purpose-built experiment may be used detect large scale effects primordial non-Gaussianity, placing stringent bounds on different models inflation. We argue that it possible place tight...
We show how future gravitational-wave detectors would be able to discriminate between the concordance Λ cold dark matter cosmological model and up-to-date competing alternatives, e.g., dynamical energy (DE) models or modified gravity (MG) theories. Our method consists of using weak-lensing magnification effect that affects a standard-siren signal because its traveling through Universe's large scale structure. As demonstration, we present constraints on DE MG from proposed detectors, namely...
Generalised Teleparallel gravity, also referred to as f(T) has been recently proposed an extended theory of gravitation able give rise accelerated expansion in a matter only universe. The cosmic speed up is driven by effective torsion fluid whose equation state depend on the function entering modified gravity Lagrangian. We focus two particular choices for which share nice property emulate phantom divide crossing suggested some recent data. check their viability contrasting predicted...