A. Ritacco
A5049383412- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Scientific Research and Discoveries
- Spacecraft Design and Technology
- Antenna Design and Optimization
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- Particle physics theoretical and experimental studies
- Molecular Spectroscopy and Structure
- Particle Detector Development and Performance
Laboratoire de Physique de l'ENS
2020-2025
École Normale Supérieure - PSL
2020-2025
Centre National de la Recherche Scientifique
2014-2024
Osservatorio Astronomico di Cagliari
2022-2024
Sorbonne Université
2020-2024
University of Rome Tor Vergata
2024
Université Paris Cité
2022-2024
Université Paris Sciences et Lettres
2022-2024
University of Pennsylvania
2024
Sapienza University of Rome
2020-2024
Millimeter-wave continuum astronomy is today an indispensable tool for both general Astrophysics studies and Cosmology. General purpose, large field-of-view instruments are needed to map the sky at intermediate angular scales not accessible by high-resolution interferometers coarse resolution space-borne or ground-based surveys. These have be installed focal plane of largest single-dish telescopes. In this context, we constructed deployed a multi-thousands pixels dual-band (150 260 GHz,...
The prototype of the NIKA2 camera, NIKA, is an instrument operating at IRAM 30-m telescope, which can observe simultaneously 150 and 260GHz. One main goals to measure pressure distribution in galaxy clusters high resolution using thermal SZ (tSZ) effect. Such observations have already proved be excellent probe cluster distributions even redshifts. However, important fraction host submm and/or radio point sources, significantly affect reconstructed signal. Here we report on <20" 260GHz...
Abstract We study the possibility of using LiteBIRD satellite B -mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar “axionlike” field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order...
Measurement of the gas velocity distribution in galaxy clusters provides insight into physics mergers, through which large scale structures form Universe. Velocity estimates within intracluster medium (ICM) can be obtained via Sunyaev-Zel'dovich (SZ) effect, but its observation is challenging both term sensitivity requirement and control systematic effects, including removal contaminants. In this paper we report resolved observations, at 150 260 GHz, SZ effect toward triple merger MACS...
The complete characterization of the pressure profile high-redshift galaxy clusters, from their core to outskirts, is a major issue for study formation large-scale structures. It essential constrain potential redshift evolution both slope and scatter mass-observable scaling relations used in cosmology studies based on cluster statistics. In this paper, we present first thermal Sunyaev-Zel'dovich (tSZ) mapping sample NIKA2 SZ large program that aims at constraining profiles tSZ-mass relation....
The change of physical conditions across the turbulent and magnetized interstellar medium (ISM) induces a 3D spatial variation properties Galactic polarized emission. observed signal results from averaging different spectral energy distributions (SED) polarization angles, along between lines sight. As consequence, total Stokes parameters $Q$ $U$ will have distorted SEDs, so that angle becomes frequency dependent. In present work, we show how this phenomenon similarly SED for three angular...
Abstract We present a study of the impact beam far side-lobe lack knowledge on measurement Cosmic Microwave Background B -mode signal at large scale. Beam side-lobes induce mismatch in transfer function Galactic foregrounds between dipole and higher multipoles which degrads performances component separation methods. This leads to foreground residuals CMB map. It is expected be one main source systematic effects future polarization observations. Thus, it becomes crucial for all-sky survey...
The thermal Sunyaev-Zel'dovich (tSZ) effect is expected to provide a low scatter mass proxy for galaxy clusters since it directly proportional the cluster energy. tSZ observations have proven be powerful tool detecting and studying them, but high angular resolution are now needed push their investigation higher redshift. In this paper, we report (< 20 arcsec) of high-redshift CL J1226.9+3332 (z=0.89). It was imaged at 150 260 GHz using NIKA camera IRAM 30-meter telescope. map shows that...
Having a detailed knowledge of the intracluster medium (ICM) to infer exact cluster physics such as dynamical state is crucial for cluster-based cosmological studies. This limits accuracy and precision mass estimation, key parameter In this paper, we conduct an in-depth analysis ACT-CL J0240.0+0116 using multi-wavelength approach, with primary focus on high angular resolution Sunyaev-Zeldovich (SZ) thermal component observations obtained under NIKA2 Large Programme (LPSZ). We create...
To understand early star formation, it is essential to determine the dust mass budget of high-redshift galaxies. Sub-millimeter rest-frame emission, dominated by cold dust, an unbiased tracer mass. The New IRAM KID Arrays 2 (NIKA2) conducted a deep blank field survey at 1.2 and 2.0,mm in GOODS-N as part NIKA2 Cosmological Legacy Survey (N2CLS), detecting 65 sources with S/N Thanks dedicated interferometric program NOEMA other high-angular resolution data, we identified multi-wavelength...
Abstract The MIllimeter Sardinia radio Telescope Receiver based on Array of Lumped elements (MISTRAL) KIDs is a millimeter camera operating at 90GHz that was recently installed the Radio (SRT) as part SRT-HighFreq program, which aims to expand capabilities telescope up W-band. After technical and scientific commissioning (2023–2024), MISTRAL will be open proposals from scientists facility instrument. provides wide 4’ field view, sampled resolution 12” with approximately 400 kinetic...
We propose a method to map the temperature distribution of hot gas in galaxy clusters that uses resolved images thermal Sunyaev-Zel'dovich (tSZ) effect combination with X-ray data. Application from New IRAM KIDs Array (NIKA) and XMM-Newton allows us measure determine spatial merging cluster MACS J0717.5+3745, at $z=0.55$. Despite complexity target object, we find good morphological agreement between maps derived spectroscopy only -- using ($T_{\rm XMM}$) Chandra CXO}$) new gas-mass-weighted...
Context . In the past decade, sensitive, resolved Sunyaev-Zel’dovich (SZ) studies of galaxy clusters have become common. Whereas many previous SZ parameterized pressure profiles clusters, non-parametric reconstructions will provide insights into thermodynamic state intracluster medium. Aim We seek to recover high redshift ( z = 0.89) cluster CLJ 1226.9+3332 as inferred from data MUSTANG, NIKA, Bolocam, and Planck instruments, which all probe different angular scales. Methods Our algorithm...
The Crab nebula is a supernova remnant exhibiting highly polarized synchrotron radiation at radio and millimetre wavelengths. It the brightest source in microwave sky with an extension of 7 by 5 arcmin, commonly used as standard candle for any experiment which aims to measure polarization sky. Though its spectral energy distribution has been well characterized total intensity, data are still lacking We report this paper high resolution observations (18′′ FWHM ) intensity linear 150 GHz NIKA...
The precise estimation of the mass galaxy clusters is a major issue for cosmology. Large cluster surveys rely on scaling laws that relate observables to their masses. From high resolution observations ~ 45 with NIKA2 and XMM-Newton instruments, SZ Program should provide an accurate relation between thermal Sunyaev-Zel'dovich effect hydrostatic mass. In this paper, we present exhaustive analysis well known CL J1226.9+3332, highest-redshift in at z = 0.89. We combine data from NIKA, Bolocam...
The characterization of dust properties in the interstellar medium (ISM) is key for star formation. Mass estimates are crucial to determine gravitational collapse conditions birth new stellar objects molecular clouds. However, most these rely on models that need further observational constraints from clouds prestellar and protostellar cores. We present results a study emissivity changes based mm-continuum data obtained with NIKA camera at IRAM-30m telescope. Observing emission 1.15 mm 2...
The determination of the thermodynamic properties clusters galaxies at intermediate and high redshift can bring new insights into formation large-scale structures. It is essential for a robust calibration mass-observable scaling relations their scatter, which are key ingredients precise cosmology using cluster statistics. Here we illustrate an application resolution $(< 20$ arcsec) thermal Sunyaev-Zel'dovich (tSZ) observations by probing intracluster medium (ICM) \planck-discovered galaxy...
NIKA2 is a dual-band millimetric continuum camera of 2900 Kinetic Inductance Detectors (KID), operating at $150$ and $260\,\rm{GHz}$, installed the IRAM 30-meter telescope. We present performance assessment after one year observation using dedicated point-source calibration method, referred to as \emph{baseline} method. Using large data set acquired between January 2017 February 2018 that span whole range observing elevations atmospheric conditions encountered 30-m telescope, we test...
Determining the mechanism by which high-mass stars are formed is essential for our understanding of energy budget and chemical evolution galaxies. By using New IRAM KIDs Array 2 (NIKA2) camera on Institut de Radio Astronomie Millim\'etrique (IRAM) 30-m telescope, we have conducted high-sensitivity large-scale mapping a fraction Galactic plane in order to search signatures transition between high- low-mass star-forming modes. Here, present first results from Star Formation with NIKA2 (GASTON)...
High-resolution mapping of the intra-cluster medium (ICM) up to high redshift and down low masses is crucial derive accurate mass estimates galaxy cluster understand systematic effects affecting cosmological studies based on clusters. We present a spatially-resolved Sunyaev-Zel'dovich (SZ)/X-ray analysis ACT-CL J0215.4+0030, ($z=0.865$) intermediate ($M_{500}\simeq3.5\times10^{14}\;\mathrm{M_\odot}$) observed as part ongoing NIKA2 SZ Large Program, follow representative sample objects at...
The search for the primordial B-modes of cosmic microwave background (CMB) relies on separation from brighter foreground dust signal. In this context, characterisation spectral energy distribution (SED) thermal in polarization has become a critical subject study. We present power-spectra analysis Planck data, which improves previous studies by using newly released SRoll2 maps that correct residual data systematics, and extending to regions near Galactic plane. Our focuses lowest multipoles...
The Cosmic Microwave Background (CMB) radiation offers a unique window into the early Universe, facilitating precise examinations of fundamental cosmological theories. However, quest for detecting B -modes in CMB, predicted by theoretical models inflation, faces substantial challenges terms calibration and foreground modeling. COSMOCal ( CO smic S urvey M illimeter wavelengths O bjects CMB experiments Calibration) project aims at enhancing accuracy absolute polarization angle ψ current...