L. Pozzetti
A5090420192- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- CCD and CMOS Imaging Sensors
- Remote Sensing in Agriculture
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Spectroscopy and Laser Applications
- Impact of Light on Environment and Health
- Advanced Vision and Imaging
- Geophysics and Gravity Measurements
- Spectroscopy and Chemometric Analyses
- Plant Water Relations and Carbon Dynamics
- Dark Matter and Cosmic Phenomena
- Advanced Fluorescence Microscopy Techniques
- Industrial Vision Systems and Defect Detection
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2025
National Institute for Astrophysics
2009-2024
New York University
2024
Flatiron Institute
2024
Royal Holloway University of London
2024
University of California, Davis
2024
Princeton University
2024
University College London
2024
University of Copenhagen
2024
Flatiron Health (United States)
2024
We explore the inter-relationships between mass, star-formation rate and environment in SDSS, zCOSMOS other surveys. The differential effects of mass are completely separable to z ~ 1, indicating that two distinct processes operating, "mass-quenching" "environment-quenching". Environment-quenching, at fixed over-density, evidently does not change with epoch suggesting it occurs as large-scale structure develops Universe. observed constancy mass-function shape for star-forming galaxies,...
We present photometric redshifts for an uniquely large and deep sample of 522286 objects with i'_{AB}<25 in the Canada-France Legacy Survey ``Deep Survey'' fields, which cover a total effective area 3.2 deg^2. use 3241 spectroscopic 0<z<5 from VIMOS VLT Deep as calibration to derive these redshifts. devise robust method removes systematic trends significantly reduces fraction catastrophic errors. our unique detailed assessment robustness redshift sample. For selected at i'_{AB}<24, we reach...
We develop a method for interpreting faint galaxy data which focuses on the integrated light radiated from population as whole. The emission history of universe at ultraviolet, optical, and near-infrared wavelengths is modeled present epoch to z ≈ 4 by tracing evolution with cosmic time luminosity density, determined several deep spectroscopic samples Hubble Deep Field (HDF) imaging survey. In q0 = 0.5, h50 1 cosmology, global spectrophotometric properties field galaxies can be well fitted...
Deriving the expansion history of Universe is a major goal modern cosmology. To date, most accurate measurements have been obtained with Type Ia Supernovae (SNe) and Baryon Acoustic Oscillations (BAO), providing evidence for existence transition epoch at which rate changes from decelerated to accelerated. However, these results within framework specific cosmological models that must be implicitly or explicitly assumed in measurement. It therefore crucial obtain accelerated independently...
zCOSMOS is a large-redshift survey that being undertaken in the COSMOS field using 600 hr of observation with VIMOS spectrograph on 8 m VLT. The designed to characterize environments galaxies from 100 kpc scales galaxy groups up Mpc scale cosmic web and produce diagnostic information active galactic nuclei. consists two parts: (1) zCOSMOS-bright, magnitude-limited I-band IAB < 22.5 sample about 20,000 0.1 z 1.2 covering whole 1.7 deg2 ACS field, for which parameters at ~ 0.7 are be directly...
A simple two-color selection based on B-, z-, and K-band photometry is proposed for culling galaxies at 1.4 ≲ z 2.5 in K-selected samples classifying them as star-forming or passive systems. The method calibrated the highly complete spectroscopic redshift database of K20 survey, verified with simulations tested other data sets. Requiring BzK = (z - K)AB (B z)AB > -0.2 allows us to select actively ≳ 1.4, independently their dust reddening. On hand, objects < colors include passively evolving...
This paper presents the ``First Epoch'' sample from VIMOS VLT Deep Survey (VVDS). The VVDS goals, observations, data reduction with VIPGI, and redshift measurement KBRED are discussed. Data have been obtained VIsible Multi Object Spectrograph (VIMOS) on ESO-VLT UT3, allowing to observe ~600 slits simultaneously at R~230. A total of 11564 objects observed in VVDS-02h VVDS-CDFS fields over a area 0.61deg^2, selected solely basis apparent magnitude 17.5 <=I_{AB} <=24. covers range 0 <...
We present spectroscopic redshifts of a large sample galaxies with IAB < 22.5 in the COSMOS field, measured from spectra 10,644 objects that have been obtained first two years observations zCOSMOS-bright redshift survey. These include statistically complete subset 10,109 objects. The average accuracy individual is 110 km s−1, independent redshift. reliability described by Confidence Class has empirically calibrated through repeat over 600 galaxies. There very good agreement between and...
We combine ultradeep optical spectroscopy from the GMASS project ("Galaxy Mass Assembly Spectroscopic Survey") with GOODS multi-band photometry and HST imaging to study a sample of passive galaxiesat 1.39<z<1.99 selected at 4.5 microns. A stacked spectrum an equivalent integration time ~500 hours was obtained is publicly released. The spectral photometric SED properties indicate very weak or absent star formation, moderately old stellar ages ~1 Gyr (for solar metallicity) masses in range...
We present new improved constraints on the Hubble parameter H ( z ) in redshift range 0.15 < 1.1, obtained from differential spectroscopic evolution of early-type galaxies as a function redshift. extract large sample ∼ 11000) several surveys, spanning almost 8 billion years cosmic lookback time (0.15 1.42). select most massive, red elliptical galaxies, passively evolving and without signature ongoing star formation. Those can be used standard chronometers, firstly proposed by Jimenez...
We exploit the deep and extended far infrared data sets (at 70, 100 160 um) of Herschel GTO PACS Evolutionary Probe (PEP) Survey, in combination with HERschel Multi tiered Extragalactic Survey (HerMES) at 250, 350 500 um, to derive evolution restframe 35 60 90 total (IR) luminosity functions (LFs) up z~4. detect very strong for IR LF combined a density evolution. In agreement previous findings, increases steeply z~1, then flattens between z~1 z~3 decrease z greater than 3. Galaxies different...
We present the galaxy stellar mass function (GSMF) to redshift z ≃ 1, based on analysis of about 8500 galaxies with I < 22.5 (AB mag) over 1.4 deg2, which are part zCOSMOS-bright 10k spectroscopic sample. investigate total GSMF, as well contributions early- and late-type (ETGs LTGs, respectively), defined by different criteria (broad-band spectral energy distribution, morphology, properties, or star formation activities). unveil a galaxybimodality in global whose shape is more accurately...
Euclid is a space-based survey mission from the European Space Agency designed to understand origin of Universe's accelerating expansion. It will use cosmological probes investigate nature dark energy, matter and gravity by tracking their observational signatures on geometry universe cosmic history structure formation. The optimised for two independent primary probes: Weak gravitational Lensing (WL) Baryonic Acoustic Oscillations (BAO). payload consists 1.2 m Korsch telescope provide large...
We present the first results of a project, LSD, aimed at obtaining spatially-resolved, near-infrared spectroscopy complete sample Lyman-Break Galaxies z~3. Deep observations with adaptive optics resulted in detection main optical lines, such as [OII], Hbeta and [OIII], which are used to study sizes, SFRs, morphologies, gas-phase metallicities, gas fractions effective yields. Optical, near-IR Spitzer/IRAC photometry is measure stellar mass. obtain that morphologies usually complex, presence...
We map the radial and azimuthal distribution of Mg II gas within 200 kpc (physical) 4000 galaxies at redshifts 0.5 < z 0.9 using co-added spectra more than 5000 background > 1. investigate variation rest frame equivalent width as a function impact parameter for different subsets foreground selected in terms their rest-frame colors masses. Blue have significantly higher average close galactocentric radii compared to red galaxies. Amongst blue galaxies, there is correlation between galactic...
We have assembled a compilation of observational Hubble parameter measurements estimated with the differential evolution cosmic chronometers, in redshift range 0<z<1.75. This sample has been used, combination CMB data and most recent estimate constant H_0, to derive new constraints on several cosmological parameters. The are very useful break some degeneracies present CMB-only analysis, constrain possible deviations from standard (minimal) flat \Lambda CDM model. H(z) especially valuable...
We describe the completed VIMOS VLT Deep Survey, and final data release of 35016 galaxies type-I AGN with measured spectroscopic redshifts up to redshift z~6.7, in areas 0.142 8.7 square degrees, volumes from 0.5x10^6 2x10^7h^-3Mpc^3. have selected samples based solely on their i-band magnitude reaching i_{AB}=24.75. Spectra been obtained ESO-VLT, integrating 0.75h, 4.5h 18h for Wide, Deep, Ultra-Deep nested surveys. A total 1263 re-observed independently within VVDS, VIPERS MASSIV They are...
Using the wide multi-band photometry available in COSMOS field we explore host galaxy properties of a large sample Active Galactic Nuclei (AGN) obtained by combining X-ray and optical spectroscopic selections. Based on careful study their Spectral Energy Distribution (SED), which has been parametrized using 2-component (AGN+galaxy) model fit, derived dust-corrected rest-frame magnitudes, colors, stellar masses star formation rates (SFRs). We find that AGN hosts span range SFRs. No...