G. F. Lesci
A5057676061- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Optical Systems and Laser Technology
- Advanced Statistical Methods and Models
- Historical Astronomy and Related Studies
- Porphyrin and Phthalocyanine Chemistry
- Historical and Architectural Studies
- Spectroscopy and Laser Applications
- Iron oxide chemistry and applications
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Mesoporous Materials and Catalysis
- Biblical Studies and Interpretation
Osservatorio di Astrofisica e Scienza dello Spazio
2021-2023
University of Bologna
2002-2023
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2023
National Institute for Astrophysics
2023
Aims. We present a cosmological analysis of abundances and stacked weak lensing profiles galaxy clusters, exploiting the AMICO KiDS-DR3 catalogue. The sample consists 3652 clusters with intrinsic richness λ * ≥ 20, over an effective area 377 deg 2 , in redshift range z ∈ [0.1, 0.6]. Methods. quantified purity completeness through simulations. statistical has been performed by simultaneously modelling co-moving number density scaling relation between richnesses cluster masses, assessed...
Aims. We analysed the clustering of a photometric sample galaxy clusters selected from Third Data Release Kilo-Degree Survey, focusing on redshift-space two-point correlation function (2PCF). compared our measurements to theoretical predictions standard Λ cold dark matter (ΛCDM) cosmological model. Methods. measured 2PCF in cluster-centric radial range r ∈ [5, 80] h −1 Mpc, considering 4934 with richness λ * ≥ 15 redshift z [0.1, 0.6]. A Markov chain Monte Carlo analysis has been performed...
Galaxy clusters and cosmic voids, the most extreme objects of our Universe in terms mass size, trace two opposite sides large-scale matter density field. By studying their abundance as a function radius, respectively, i.e. halo (HMF) void size (VSF), it is possible to achieve fundamental constraints on cosmological model. While HMF has already been extensively exploited providing robust main model parameters (e.g. $\Omega_{\rm m}$, $\sigma_8$ $S_8$), VSF still emerging viable effective...
Aims. We derived galaxy colour selections from Euclid and ground-based photometry, aiming to accurately define background samples in cluster weak-lensing analyses. These have been implemented the data analysis pipelines for clusters. Methods. Given any set of photometric bands, we developed a method calibration optimal that maximises selection completeness, given threshold on purity. Such are expressed as function lens redshift. Results. calibrated using simulated griz EuclidY E J H...
Context. Weak gravitational lensing offers a powerful method to investigate the projected matter density distribution within galaxy clusters, granting crucial insights into broader landscape of dark on cluster scales. Aims. In this study, we make use large photometric data set derived from publicly available Third Data Release Kilo-Degree Survey, along with associated shear signal. Our primary objective is model peculiar sharp transition in profile slope, that what commonly referred as...
Stoichiometric chrysotile single crystals have been synthesized as a unique phase by hydrothermal reaction under controlled conditions; the monocrystals show cylinder-in-cylinder morphology and can be used reference sample with definite chemical composition to investigate factors responsible of cytotoxicities carcinogenicities.
The photometric catalogue of galaxy clusters extracted from ESA Euclid data is expected to be very competitive for cosmological studies. Using dedicated hydrodynamical simulations, we present systematic analyses simulating the weak-lensing profiles in a variety dynamic states and wide range redshifts. In order derive cluster masses, use model consistent with implementation within Consortium processing function find that when jointly mass concentration parameter Navarro–Frenk–White halo...
Context. The large-scale mass distribution around dark matter haloes hosting galaxy clusters provides sensitive cosmological information. Aims. In this work, we make use of a large photometric cluster sample, constructed from the public Third Data Release Kilo-Degree Survey, and corresponding shear signal, to assess masses test concordance ${\Lambda}$-cold (${\Lambda}$CDM) model. particular, study weak gravitational lensing effects on scales beyond virial radius, where signal is dominated by...
We study the tomographic clustering properties of photometric cluster catalogue derived from third data release Kilo Degree Survey (KiDS), focusing on angular correlation function and its spherical harmonic counterpart: power spectrum. measured spectrum a sample 5162 clusters, with an intrinsic richness λ * ≥ 15, in redshift range z ∈ [0.1, 0.6]. compared our measurements theoretical models, within framework Λ cold dark matter cosmology. performed Markov chain Monte Carlo (MCMC) analysis to...
Galaxy clusters are biased tracers of the underlying matter density field. At very large radii beyond about 10 Mpc/\textit{h}, shear profile shows evidence a second-halo term. This is related to correlated distribution around galaxy and proportional so-called halo bias. We present an observational analysis bias-mass relation based on AMICO cluster catalog, comprising 7000 candidates detected in third release KiDS survey. split sample into 14 redshift-richness bins derive bias virial mass...
The photometric catalogue of galaxy clusters extracted from ESA Euclid data is expected to be very competitive for cosmological studies. Using state-of-the-art hydrodynamical simulations, we present systematic analyses simulating the weak lensing profiles in a variety dynamic states and at wide range redshifts. In order derive cluster masses, use model consistent with implementation within Consortium dedicated processing function find that, when jointly modelling mass concentration parameter...
Unbiased and precise mass calibration of galaxy clusters is crucial to fully exploit as cosmological probes. Stacking weak lensing signal allows us measure observable-mass relations down less massive halos without extrapolation. We propose a Bayesian inference method constrain the intrinsic scatter proxy in stacked analyses. The data rescaled with respect individual based on number binned clusters. apply this detected AMICO (Adaptive Matched Identifier Clustered Objects) algorithm third...
Brightest Cluster Galaxies (BCGs) are typically massive ellipticals at the centers of clusters. They believed to experience strong environmental processing, and their mass assembly star formation history still debated. We have selected three forming BCGs in equatorial field Kilo-Degree Survey (KiDS) intermediate redshifts. observed them with IRAM-30m telescope first CO transitions. remarkably detected all high signal-to-noise ratio ${\rm S/N}\simeq(3.8-10.2)$, for a total 7 lines out 8,...
We analysed the 3D clustering of Planck sample Sunyaev-Zeldovich (SZ) selected galaxy clusters, focusing on redshift-space two-point correlation function (2PCF). compared our measurements to theoretical predictions standard $\Lambda$ cold dark matter ($\Lambda$CDM) cosmological model, deriving an estimate mass bias, $b_{\mathrm SZ}$, and parameters. measured 2PCF in cluster-centric radial range $r\in[10,150]$ $h^{-1}$Mpc, considering 920 clusters with redshift $z\leq0.8$. A Markov chain...
We constrain the $\Lambda$CDM cosmological parameter $\sigma_{8}$ by applying extreme value statistics for galaxy cluster mass on AMICO KiDS-DR3 catalog. sample posterior distribution of parameters considering likelihood observing largest in a $N_{\textrm{obs}} = 3644$ clusters with intrinsic richness $\lambda^{*} > 20$ redshift range $z\in[0.10, 0.60]$. obtain $\sigma_{8}=0.90_{-0.18}^{+0.20}$, consistent within $1\sigma$ measurements obtained Planck collaboration and previous results from...
Context. Weak gravitational lensing offers a powerful method to investigate the projected matter density distribution within galaxy clusters, granting crucial insights into broader landscape of dark on cluster scales. Aims. In this study, we make use large photometric data set derived from publicly available Third Data Release Kilo-Degree Survey, along with associated shear signal. Our primary objective is model peculiar sharp transition in profile slope, that what commonly referred as...
Brightest cluster galaxies (BCGs) are among the most massive in Universe. Their star formation (SF) history and stellar mass assembly debated. Recent studies suggest presence of an emerging population intermediate-$z$ forming gas-rich BCGs, where molecular gas reservoirs impacted by strong environmental processing. We have selected three star-forming $z\sim0.4$ BCGs Kilo-Degree Survey (KiDS), observed them with IRAM 30m telescope first CO transitions. found double-horn CO(1$\rightarrow$0)...
We derived galaxy colour selections from Euclid and ground-based photometry, aiming to accurately define background samples in cluster weak-lensing analyses. Given any set of photometric bands, we developed a method for the calibration optimal that maximises selection completeness, given threshold on purity. calibrated using simulated $griz$ $Y_{\rm E}J_{\rm E}H_{\rm E}$ photometry. Both produce purity higher than 97%. The completeness ranges 30% 84% lens redshift range $z_{\rm...