L. P. Cassarà
A5108166930- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Remote Sensing in Agriculture
- Adaptive optics and wavefront sensing
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Chemometric Analyses
- Dark Matter and Cosmic Phenomena
- Plant Water Relations and Carbon Dynamics
- Scientific Research and Discoveries
- Advanced Fluorescence Microscopy Techniques
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Impact of Light on Environment and Health
- Spectroscopy and Laser Applications
- Advanced Optical Sensing Technologies
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Advanced Data Storage Technologies
National Institute for Astrophysics
2013-2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
2019-2022
National Observatory of Athens
2016-2022
We present the VIMOS Ultra Deep Survey (VUDS), a spectroscopic redshift survey of ~10.000 very faint galaxies to study major phase galaxy assembly 2<z<~6. The covers 1 deg^2 in 3 separate fields: COSMOS, ECDFS and VVDS-02h, with targets selection based on an inclusive combination photometric redshifts color properties. Spectra covering 3650<lambda<9350 A are obtained ESO-VLT integration times 14h. Here we strategy, target selection, data processing, as well measurement process, emphasizing...
We study the evolution of star formation rate (SFR) – stellar mass (M⋆) relation and specific (sSFR) star-forming galaxies (SFGs) since a redshift z ≃ 5.5 using 2435 (4531) with highly reliable spectroscopic redshifts in VIMOS Ultra-Deep Survey (VUDS). It is first time that these relations can be followed over such large range from single homogeneously selected sample redshifts. The log − for SFGs remains roughly linear all way up to = 5, but SFR steadily increases at fixed increasing...
The purpose of this work is the characterization radial distribution dust, stars, gas, and star-formation rate (SFR) in a sub-sample 18 face-on spiral galaxies extracted from DustPedia sample. This study performed by exploiting multi-wavelength, UV to sub-mm bands, database, addition molecular (12CO) atomic (HI) gas maps metallicity abundance information available literature. We fitted surface brightness profiles tracers dust mass density total SFR with an exponential curve derived their...
Within the framework of DustPedia project we investigate properties cosmic dust and its interaction with stellar radiation (originating from different populations) for 814 galaxies in nearby Universe, all observed by Herschel Space Observatory. We take advantage widely used galaxy SED fitting code CIGALE, properly adapted to include state-of-the-art model THEMIS. Using photometry determine physical galaxies, such as, mass, star-formation rate, bolometric luminosity as well unattenuated...
[Abridged] We unveil the complex shape of a proto-supercluster at z~2.45 in COSMOS field using spectroscopic redshifts VIMOS Ultra-Deep Survey (VUDS), complemented by zCOSMOS-Deep sample and high-quality photometric redshifts. The method relies on 2D Voronoi tessellation overlapping redshift slices that is converted into 3D density field. galaxy distribution constructed statistical treatment identify proto-supercluster, dubbed "Hyperion" for its immense size mass, which extends over volume...
We present the discovery of PSO J030947.49+271757.31, radio brightest (23.7 mJy at 1.4 GHz) active galactic nucleus (AGN) z>6.0. It was selected by cross-matching NRAO VLA Sky Survey and Panoramic Telescope Rapid Response System PS1 databases its high-z nature confirmed a dedicated spectroscopic observation Large Binocular Telescope. A pointed Neil Gehrels $Swift$ Observatory XRT allowed us to measure flux $\sim$3.4$\times$10$^{-14}$ erg s$^{-1}$ cm$^{-2}$ in [0.5-10] keV energy band, which...
Abstract The Charting Cluster Construction with VUDS and ORELSE (C3VO) survey is an ongoing imaging spectroscopic campaign aiming to map out the growth of structure up z ∼ 5 was born from combination Visible Multi-Object Spectrograph Ultra Deep Survey Observations Redshift Evolution in Large-Scale Environments (ORELSE) survey. As we previously accomplished survey, apply our technique known as Voronoi tessellation Monte Carlo (VMC) mapping search for serendipitous galaxy overdensities at 2...
High-density environments are crucial places for studying the link between hierarchical structure formation and stellar mass growth in galaxies. In this work, we characterise a massive proto-cluster at z = 2.895 that found COSMOS field using spectroscopic sample of VIMOS Ultra-Deep Survey (VUDS). This is one rare structures ~ 3 not identified around an active galactic nucleus (AGN) or radio galaxy, thus it represents ideal laboratory investigating galaxies dense environments. The comprises...
Aims. The aim of this work is to constrain the evolution fraction Lya emitters among UV selected star forming galaxies at 2<z<6, and measure stellar escape photons over same redshift range. Methods. We exploit ultradeep spectroscopic observations collected by VIMOS Ultra Deep Survey (VUDS) build an unique, complete unbiased sample 4000 spectroscopically confirmed 2<z<6. Our galaxy luminosities brighter than M* down one magnitude fainter 2<z<3.5. Results. find that 80% in our have...
Observations of evolution in the dust-to-metal ratio allow us to constrain dominant dust processing mechanisms. In this work, we present a study and dust-to-gas ratios sub-sample ~500 DustPedia galaxies. Using literature MUSE emission line fluxes, derived gas-phase metallicities (oxygen abundances) for over 10 000 individual regions determine characteristic each galaxy. We how relative dust, gas, metal contents galaxies evolve by using metallicity gas fraction as proxies evolutionary state....
This paper describes the first data release (DR1) of VIMOS Ultra Deep Survey (VUDS). The DR1 includes all low-resolution spectroscopic obtained in 276.9 arcmin2 CANDELS-COSMOS and CANDELS-ECFDS survey areas, including accurate redshifts z_spec individual spectra with on ESO-VLT. A total 698 objects have a measured redshift, 677 galaxies, two type-I AGN small number 19 contaminating stars. targets are selected primarily basis their photometric to ensure broad population coverage. About 500...
Context. The ionizing Lyman continuum flux escaping from high-redshift galaxies into the intergalactic medium is a fundamental quantity to understand physical processes involved in reionization epoch. However, an observational point of view, direct detections HI photons at high redshifts are feasible for mainly interval z ~ 3−4.
Aims . We aim to study the fraction of stellar radiation absorbed by dust, f abs , in 814 galaxies different morphological types. The targets constitute vast majority (93%) DustPedia sample, including almost all large (optical diameter larger than 1′), nearby ( v ≤ 3000 km s −1 ) observed with Herschel Space Observatory. Methods For each object, we modelled spectral energy distribution from ultraviolet sub-millimetre using dedicated, aperture-matched photometry and Code Investigating GALaxy...
The purpose of this work is the characterization main scaling relations between all ISM components (dust, atomic/molecular/total gas), gas-phase metallicity, and other galaxy properties, such as Mstar morphology, for late-type galaxies in Local Universe. This study performed by extracting from entire DustPedia sample exploiting large homogeneous dataset available thanks to project. consists 436 with morphological stage T = 1 10, 6 x 10^7 3 10^11 Msun, SFR 10^(-4) 60 Msun/yr, 12 + log(O/H) 8...
Stars with zero-age main sequence masses between 140 and 260 M ⊙ are thought to explode as pair-instability supernovae (PISNe). During their thermonuclear runaway, PISNe can produce up several tens of solar radioactive nickel, resulting in luminous transients similar some superluminous (SLSNe). Yet, no unambiguous PISN has been discovered so far. SN 2018ibb is a hydrogen-poor SLSN at z = 0.166 that evolves extremely slowly compared the hundreds known SLSNe. Between mid 2018 early 2022, we...
The European Space Agency has invested heavily in two cornerstones missions; Herschel and Planck. legacy data from these missions provides us with an unprecedented opportunity to study cosmic dust galaxies so that we can answer fundamental questions about, for example: the origin of chemical elements, physical processes interstellar medium (ISM), its effect on stellar radiation, relation star formation how this relates far infrared background. In paper describe DustPedia project, which is...
ABSTRACT The dust mass absorption coefficient, κd is the conversion function used to infer physical masses from observations of emission. However, it notoriously poorly constrained, and highly uncertain how varies, either between or within galaxies. Here we present results a proof-of-concept study, using DustPedia data for two nearby face-on spiral galaxies M 74 (NGC 628) 83 5236), create first ever maps in We determine an empirical method that exploits fact dust-to-metals ratio interstellar...
Abstract We present an analysis of the number density galaxies as a function stellar mass (i.e., (SMF)) in COSMOS field at z ∼ 3.3, making comparison between SMF overdense environments and coeval field. In particular, this region contains Elentári proto-supercluster, system six extended overdensities spanning ∼70 cMpc on side. A clear difference is seen high-mass slope these SMFs, with regions showing increase ratio to low-mass relative field, indicating more rapid buildup environments. This...
Aims. The DustPedia project is capitalising on the legacy of Herschel Space Observatory, using cutting-edge modelling techniques to study dust in 875 galaxies – representing vast majority extended within 3000 km s -1 that were observed by . This work requires a database multiwavelength imagery and photometry greatly exceeds scope (in terms wavelength coverage number galaxies) any previous local-Universe survey. Methods. We constructed containing our own custom reductions, along with...
Using new spectroscopic observations obtained as part of the VIMOS Ultra-Deep Survey (VUDS), we performed a systematic search for overdense environments in early universe (z> 2) and report here on discovery Cl J0227-0421, massive protocluster at z = 3.29. This is characterized by both large overdensity spectroscopically confirmed members, δgal 10.5 ± 2.8, significant photometric redshift members. The halo mass this estimated variety methods to be ~3 × 1014ℳ⊙ ~ 3.3, which, evolved 0 results...
We report the discovery of 31 low-luminosity (−14.5 ≳ MAB(B) −18.8), extreme emission line galaxies (EELGs) at 0.2 ≲ z 0.9 identified by their unusually high rest-frame equivalent widths (100 ≤ EW[O iii] 1700 Å) as part VIMOS Ultra Deep Survey (VUDS). optical spectra unprecedented sensitivity (IAB ~ 25 mag) along with multiwavelength photometry and HST imaging are used to investigate spectrophotometric properties this unique sample explore, for first time, very low stellar mass end (M⋆...
We compare the spectral energy distributions (SEDs) and inferred physical properties for simulated observed galaxies at low redshift. exploit UV-submillimetre mock fluxes of ~7000 z=0 from EAGLE suite cosmological simulations, derived using radiative transfer code SKIRT. these to ~800 in range, DustPedia sample nearby galaxies. To derive global properties, we apply SED fitting CIGALE consistently both data sets, same set ~80 million models. The results this comparison reveal overall...
Aims. We perform a homogeneous analysis of an unprecedented set spatially resolved scaling relations (SRs) between interstellar medium (ISM) components, that is to say dust, gas, and gas-phase metallicity, other galaxy properties, such as stellar mass ( M star ), total baryonic content, star-formation rate (SFR), in range physical scales 0.3 3.4 kpc. also study some ratios components: dust-to-stellar, dust-to-gas, dust-to-metal ratios. Methods. use sample 18 large, spiral, face-on DustPedia...
ABSTRACT Motivated by spectroscopic confirmation of three overdense regions in the COSMOS field at z ∼ 3.35, we analyse uniquely deep multiwavelength photometry and extensive spectroscopy available to identify any further related structure. We construct a three-dimensional density map using Voronoi tesselation Monte Carlo method find additional significant overdensity. Here, present examine set six structures 3.20 &lt; 3.45 field, most well-characterized which, PCl J0959 + 0235, has 80...