G. de Gasperis
A5108166911- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Advanced Thermodynamic Systems and Engines
- Ionosphere and magnetosphere dynamics
- Physics of Superconductivity and Magnetism
- Particle physics theoretical and experimental studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Geomagnetism and Paleomagnetism Studies
- Statistical and numerical algorithms
- Astro and Planetary Science
- Relativity and Gravitational Theory
- GNSS positioning and interference
Sapienza University of Rome
2018-2024
University of Rome Tor Vergata
2012-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2016-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2022
National University of Ireland
2022
National University of Ireland, Maynooth
2018-2020
Universidad Nacional de La Plata
2020
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2019
Istituto Nazionale di Fisica Nucleare
2019
University of Milano-Bicocca
2018
We present the first results from science demonstration phase for Hi-GAL survey, <i>Herschel<i/> key program that will map inner Galactic plane of Milky Way in 5 bands. outline our data reduction strategy and some highlights on two observed 2° × tiles approximately centered at <i>l<i/> = 30° 59°. The regions are extremely rich intense highly structured extended emission which shows a widespread organization filaments. Source SEDs can be built hundreds objects fields, physical parameters...
Hi-GAL, the Herschel infrared Galactic Plane Survey, is an Open Time Key Project of Space Observatory. It will make unbiased photometric survey inner plane by mapping a 2° wide strip in longitude range ∣l∣ < 60° five wavebands between 70 μm and 500 μm. The aim Hi-GAL to detect earliest phases formation molecular clouds high-mass stars use optimum combination wavelength coverage, sensitivity, strategy, speed deliver homogeneous census star-forming regions cold structures interstellar medium....
An all sky map of the apparent temperature and optical depth thermal dust emission is constructed using Planck-HFI (350μm to 2 mm) andIRAS(100μm) data. The maps are correlated with tracers atomic (Hi) molecular gas traced by CO. correlation column density observed linear in lowest regions at high Galactic latitudes. At NH, consistent that for a given choice CO-to-H2 conversion factor. In intermediate NH range, departure from linearity observed, excess correlation. This attributed associated...
The European Space Agency's Planck satellite was launched on 14 May 2009, and has been surveying the sky stably continuously since 13 August 2009. Its performance is well in line with expectations, it will continue to gather scientific data until end of its cryogenic lifetime. We give an overview history first year operations, describe some key aspects satellite. This paper part a package submitted conjunction Planck's Early Release Compact Source Catalogue, product based be released...
We present the first all-sky sample of galaxy clusters detected blindly by Planck satellite through Sunyaev-Zeldovich (SZ) effect from its six highest frequencies. This early SZ (ESZ) is comprised 189 candidates, which have a high signal-to-noise ratio ranging 6 to 29. Its reliability (purity above 95%) further ensured an extensive validation process based on internal quality assessments and external cross-identification follow-up observations. provides measured signal for about 80% 169...
Taking advantage of the all-sky coverage and broadfrequency range Planck satellite, we study Sunyaev-Zeldovich (SZ) pressure profiles 62 nearby massive clusters detected at high significance in 14-month nominal survey. Careful reconstruction SZ signal indicates that most are individually least out to R500. By stacking radial profiles, have statistically 3 × R500, i.e., a density contrast about 50–100, though dispersion mean profile dominates statistical errors across whole range. Our...
We report measurements of the CMB polarization power spectra from January 2003 Antarctic flight BOOMERANG. The primary results come six days observation a patch covering 0.22% sky centered near R.A. = 82.5 deg., Dec= -45 deg. observations were made using four pairs sensitive bolometers operating in bands at 145 GHz. Using two independent analysis pipelines, we measure non-zero <EE> signal range 100< l <1000 with significance 4.8-sigma, 2-sigma upper limit 8.6 uK^2 for any <BB> contribution,...
We report on observations of the Cosmic Microwave Background (CMB) obtained during January 2003 flight Boomerang . These results are derived from 195 hours observation with four 145 GHz Polarization Sensitive Bolometer (PSB) pairs, identical in design to 143 Planck HFI polarized pixels. The data include 75 distributed over 1.84% sky an additional 120 concentrated central portion field, itself representing 0.22% full sky. From these we derive estimate angular power spectrum temperature...
In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of Planck space mission, ESA program dedicated to precision imaging cosmic microwave background (CMB). Planck-LFI will observe full sky in intensity polarisation three frequency bands centred at 30, 44 70 GHz, while higher frequencies (100-850 GHz) be covered by HFI instrument. The LFI is an array radiometers based on state-of-the-art Indium Phosphide cryogenic HEMT amplifiers implemented a...
We present the statistical properties of first version Cold Core Catalogue Planck Objects (C3PO), in terms their spatial distribution, temperature, distance, mass, and morphology. also describe statistics Early (ECC, delivered with Release Compact Source Catalogue, ERCSC) that is subset 915 most reliable detections complete catalogue. have used CoCoCoDeT algorithm to extract 10783 cold sources. Temperature dust emission spectral index {\beta} values are derived using fluxes IRAS 100 \mum...
We present precise Sunyaev-Zeldovich (SZ) effect measurements in the direction of 62 nearby galaxy clusters (z <0.5) detected at high signal-to-noise first Planck all-sky dataset. The sample spans approximately a decade total mass, 10^14 < M_500 10^15, where is mass corresponding to density contrast 500. Combining these quality with deep XMM-Newton X-ray data, we investigate relations between D_A^2 Y_500, integrated Compton parameter due SZ effect, and X-ray-derived gas M_g,500, temperature...
Planck allows unbiased mapping of Galactic sub-millimetre and millimetre emission from the most diffuse regions to densest parts molecular clouds. We present an early analysis Taurus complex, on line-of-sight-averaged data without component separation. The spectrum measured by IRAS can be fitted pixel using a single modified blackbody. Some systematic residuals are detected at 353 GHz 143 GHz, with amplitudes around -7 % +13 %, respectively, indicating that spectra likely more complex than...
Anomalous microwave emission (AME) has been observed by numerous experiments in the frequency range ~10-60 GHz. Using Planck maps and multi-frequency ancillary data, we have constructed spectra for two known AME regions: Perseus Rho Ophiuchi molecular clouds. The are well fitted a combination of free-free radiation, cosmic background, thermal dust, electric dipole radiation from small spinning dust grains. most precisely measured to date, show high side clearly first time. peak 20-40 GHz...
Using Planck maps of six regions low Galactic dust emission with a total area about 140 square degrees, we determine the angular power spectra cosmic infrared background (CIB) anisotropies from multipole l = 200 to 2000 at 217, 353, 545 and 857 GHz. We use 21-cm observations HI as tracer thermal reduce already level 143 GHz in these fields clean out microwave anisotropies. Both cleaning processes are necessary avoid significant contamination CIB signal. measure correlated structure across...
This paper presents the first results from a comparison of Planck dust maps at 353, 545 and 857GHz, along with IRAS data 3000 (100 μm) 5000GHz (60 μm), Green Bank Telescope 21-cm observations Hi in 14 fields covering more than 800deg2 high Galactic latitude. The main goal this study is to estimate far-infrared sub-millimeter (submm) emissivity diffuse local interstellar medium (ISM) intermediate-velocity (IVC) high-velocity clouds (HVC) halo. emission for average column density lower 2 ×...
We forecast the main cosmological parameter constraints achievable with CORE space mission which is dedicated to mapping polarisation of Cosmic Microwave Background (CMB). was recently submitted in response ESA's fifth call for medium-sized proposals (M5). Here we report results from our pre-submission study impact various instrumental options, particular telescope size and sensitivity level, review great, transformative potential as proposed. Specifically, assess on a broad range...
We present the scaling relation between Sunyaev-Zeldovich (SZ) signal and stellar mass for almost 260,000 locally brightest galaxies (LBGs) selected from Sloan Digital Sky Survey (SDSS). These are predominantly central of their dark matter halos. calibrate stellar-to-halo conversion using realistic mock catalogues based on Millennium Simulation. Applying a multi-frequency matched filter to Planck data each LBG, averaging results in bins mass, we measure mean SZ down $M_\ast\sim 2\times...
All-sky data from the Planck survey and Meta-Catalogue of X-ray detected Clusters galaxies (MCXC) are combined to investigate relationship between thermal Sunyaev-Zeldovich (SZ) signal luminosity. The sample comprises ~ 1600 clusters with redshifts up 1 spans a wide range in SZ is extracted for each object individually, statistical significance measurement maximised by averaging bins luminosity, total mass, or redshift. at very high over more than two decades luminosity (10^43 erg/s < L_500...
We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10 ksec) exposures, ten as part a pilot programme sample low range signal-to-noise ratios (4<S/N<6), and further 15 in observe S/N>5 The sensitivity spatial resolution allows unambiguous discrimination between clusters false 4 S/N <= 4.1. A total 21 are confirmed extended X-ray sources. Seventeen single clusters, majority which found highly...
The scientific performance of the Planck Low Frequency Instrument (LFI) after one year in-orbit operation is presented. We describe main optical parameters and discuss photometric calibration, white noise sensitivity, properties. A preliminary evaluation impact systematic effects For each parameters, we outline methods used to obtain them from flight data provide a comparison with pre-launch ground assessments, which are essentially confirmed in flight.
We present the data reduction pipeline for Hi-GAL survey. is a key project of Herschel satellite which mapping inner part Galactic plane (|l| <= 70\cdot and |b| 1\cdot), using 2 PACS 3 SPIRE frequency bands, from 70{\mu}m to 500{\mu}m. Our relies only partially on Interactive Standard Environment (HIPE) features several newly developed routines perform reduction, including accurate culling, noise estimation minimum variance map-making, latter performed with ROMAGAL algorithm, deep...