M. Vaccari
A5006179100- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Spectroscopy and Laser Applications
- GNSS positioning and interference
- CCD and CMOS Imaging Sensors
- Spectroscopy and Chemometric Analyses
- Scientific Measurement and Uncertainty Evaluation
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Atmospheric Ozone and Climate
- History and Developments in Astronomy
Istituto di Radioastronomia di Bologna
2016-2025
University of Cape Town
2017-2025
Inter-university Institute for Data Intensive Astronomy
2019-2025
University of the Western Cape
2016-2025
Cardiff University
2024
National Institute for Astrophysics
2011-2022
Rutgers, The State University of New Jersey
2018
The University of Western Australia
2018
University of Louisville
2018
Leiden University
2018
ABSTRACT We present the COSMOS2015 24 catalog, which contains precise photometric redshifts and stellar masses for more than half a million objects over 2deg 2 COSMOS field. Including new <?CDATA ${{YJHK}}_{{\rm{s}}}$?> images from UltraVISTA-DR2 survey, Y-band Subaru/Hyper-Suprime-Cam, infrared data Spitzer Large Area Survey with Hyper-Suprime-Cam legacy program, this near-infrared-selected catalog is highly optimized study of galaxy evolution environments in early universe. To maximize...
Context. The background radiation in the optical and infrared cause energy loss propagation of high particles through space. In particular, TeV observations with Cherenkov telescopes extragalactic sources are influenced by opacity effects due to interaction very high-energy source photons light.
The Herschel Multi-tiered Extragalactic Survey (HerMES) is a legacy programme designed to map set of nested fields totalling ∼380 deg2. Fields range in size from 0.01 ∼20 deg2, using the Herschel-Spectral and Photometric Imaging Receiver (SPIRE) (at 250, 350 500 μm) Herschel-Photodetector Array Camera Spectrometer (PACS) 100 160 μm), with an additional wider component 270 deg2 SPIRE alone. These bands cover peak redshifted thermal spectral energy distribution interstellar dust thus capture...
The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with unique combination of high angular resolution ($\approx$2.5"), sensitivity (a 1$\sigma$ goal 70 $\mu$Jy/beam in the coadded data), full linear Stokes polarimetry, time domain coverage, and wide bandwidth (2-4 GHz). first observations began September 2017, observing for will finish 2024. VLASS use approximately 5500 hours on Karl G. Jansky (VLA) to cover whole visible VLA (Declination $>-40^{\circ}$), total...
The Herschel ATLAS is the largest open-time key project that will be carried out on Space Observatory. It survey 510 square degrees of extragalactic sky, four times larger than all other surveys combined, in five far-infrared and submillimetre bands. We describe survey, complementary multi-wavelength datasets combined with data, six major science programmes we are undertaking. Using new models based a previous galaxies, present predictions properties sources wavebands.
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 maps, source catalogue and number counts of largest, most complete unbiased extragalactic submillimetre survey ever undertaken: 850-micron SCUBA HAlf Degree Extragalactic Survey (SHADES). Using Submillimetre Common-User Bolometer Array (SCUBA) on James Clerk Maxwell Telescope (JCMT), SHADES mapped two separate regions sky: Subaru/XMM-Newton Deep Field (SXDF) Lockman Hole East (LH). These maps cover 720 square arcmin with an RMS noise level about 2 mJy have uncovered >100...
The Herschel Reference Survey is a guaranteed time key project and will be benchmark study of dust in the nearby universe. survey complement number other projects including large cosmological surveys that trace distant We use to produce images statistically-complete sample 323 galaxies at 250, 350 500 micron. volume-limited, containing sources with distances between 15 25 Mpc flux limits K-band minimize selection effects associated young high-mass stars introduce stellar mass. spans whole...
Abstract The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, wealth new imaging and spectroscopic data have been collected COSMOS field. This paper describes collection, processing, analysis these to produce reference photometric redshift catalog. Source detection multiwavelength photometry are performed for 1.7 million sources across 2 deg field, ∼966,000 which measured with all available broadband using both...
The Dwarf Galaxy Survey (DGS) program is studying low-metallicity galaxies using 230h of far-infrared (FIR) and submillimetre (submm) photometric spectroscopic observations the Herschel Space Observatory draws to this a rich database wide range wavelengths tracing dust, gas stars. This sample 50 includes largest metallicity achievable in local Universe including lowest (Z) galaxies, 1/50 Zsun, spans 4 orders magnitude star formation rates. survey designed get handle on physics interstellar...
Determining an accurate position for a submillimetre (submm) galaxy (SMG) is the crucial step that enables us to move from basic properties of SMG sample – source counts and 2D clustering assessment their detailed, multiwavelength properties, contribution history cosmic star formation links with present-day populations. In this paper, we identify robust radio and/or infrared (IR) counterparts, hence positions, over two-thirds SCUBA HAlf-Degree Extragalactic Survey (SHADES) Source Catalogue,...
We report on the sensitivity of SPIRE photometers <i>Herschel<i/> Space Observatory. Specifically, we measure confusion noise from observations taken during science demonstration phase Multi-tiered Extragalactic Survey. Confusion is defined to be spatial variation sky intensity in limit infinite integration time, and found consistent among different fields our survey at level 5.8, 6.3 6.8 mJy/beam 250, 350 500 <i>μ<i/>m, respectively. These results, together with measured instrument noise,...
We set out to determine the ratio, q(IR), of rest-frame 8-1000um flux, S(IR), monochromatic radio S(1.4GHz), for galaxies selected at far-IR and wavelengths, search signs that ratio evolves with redshift, luminosity or dust temperature, identify any far-IR-bright outliers - useful laboratories exploring why far-IR/radio correlation is generally so tight when prevailing theory suggests variations are almost inevitable. use flux-limited 250-um 1.4-GHz samples, obtained in GOODS-N using...
ABRIGED Herschel/SPIRE has provided confusion limited maps of deep fields at 250, 350, and 500um, as part the HerMES survey. Due to confusion, only a small fraction Cosmic Infrared Background can be resolved into individually-detected sources. Our goal is produce galaxy number counts redshift distributions below limit, which we then use place strong constraints on origins cosmic infrared background models evolution. We individually extracted bright SPIRE with method using positions, flux...
Emission at far-infrared wavelengths makes up a significant fraction of the total light detected from galaxies over age Universe. Herschel provides an opportunity for studying peak wavelength their emission. Our aim is to provide benchmark models galaxy population evolution and test pre-existing galaxies. With Multi-tiered Extra-galactic survey, HerMES, we have observed number fields different areas sensitivity using SPIRE instrument on Herschel. We determined counts down ~20 mJy....
We gather infrared (IR) photometric data from 8 to 500 microns (Spitzer, WISE, IRAS and Herschel) for all of the HRS galaxies. Draine & Li (2007) models are fit which stellar contribution has been carefully removed. find that our coverage is sufficient constrain parameters a strong constraint on 20-60 range mandatory estimate relative photo-dissociation regions IR SED. The SED tend systematically under-estimate observed flux densities, especially low mass systems. provide output galaxies:...
We study a sample of Herschel-PACS selected galaxies within the GOODS-South and COSMOS fields in framework PACS Evolutionary Probe (PEP) project. Starting from rich multi-wavelength photometric data-sets available both fields, we perform broad-band Spectral Energy Distribution (SED) decomposition to disentangle possible active galactic nucleus (AGN) contribution that related host galaxy. find 37 per cent Herschel-selected shows signatures nuclear activity at 99 confidence level. The...
Using new homogeneous LFs in the FUV and FIR Herschel/PEP Herschel/HerMES, we study evolution of dust attenuation with redshift. With this information hand, are able to estimate redshift total (FUV + FIR) star formation rate density SFRD_TOT. By integrating SFRD_TOT, follow mass building analyze stellar (SMD). This letter aims at providing a complete view from local universe z = 4 and, using assumptions on earlier history, compares what was known before an attempt draw picture global...
We present the SWIRE Photometric Redshift Catalogue 1 025 119 redshifts of unprecedented reliability and accuracy comparable with or better than previous work. Our methodology is based on fixed galaxy quasi-stellar object templates applied to data at 0.36–4.5 μm, a set four infrared emission fitted excess 3.6–170 μm. The are initially empirical, but given greater physical validity by fitting star formation histories them, which also allows us estimate stellar masses. code involves two passes...
We present the Spitzer Extragalactic Representative Volume Survey (SERVS), an 18 deg2 medium-deep survey at 3.6 and 4.5 μm with postcryogenic Space Telescope to ≈2 μJy (AB = 23.1) depth of five highly observed astronomical fields (ELAIS-N1, ELAIS-S1, Lockman Hole, Chandra Deep Field South, XMM-LSS). SERVS is designed enable study galaxy evolution as a function environment from z ∼ 5 day first extragalactic that both large enough deep put rare objects such luminous quasars clusters ≳ 1 into...
We use Herschel Space Observatory data to place observational constraints on the peak and Rayleigh-Jeans slope of dust emission observed at 70-500 microns in nearby spiral galaxy M81. find that ratios wave bands between 160 500 are primarily dependent radius but ratio 70 micron shows no clear dependence surface brightness or radius. These results along with analyses spectral energy distributions imply 160-500 traces 15-30 K heated by evolved stars bulge disc whereas includes active galactic...
Using Herschel data from the deepest SPIRE and PACS surveys (HerMES PEP) in COSMOS GOODS (N+S), we examine dust properties of IR-luminous (L_IR>10^10 L_sun) galaxies at 0.1<z<2 determine how these evolve with cosmic time. The unique angle this work is rigorous analysis survey selection effects, making first study star-formation-dominated, population within a framework almost entirely free biases. We find that have SEDs broad far-IR peaks characterised by cool/extended emission average...
We present the cross-identification and source photometry techniques used to process Herschel SPIRE imaging taken as part of Multi-Tiered Extragalactic Survey (HerMES). Cross-identifications are performed in map-space so minimise blending effects. make use a combination linear inversion model selection produce reliable catalogues based on Spitzer MIPS 24 micron positions. Testing simulations real observations show that this approach gives robust results for even faintest sources S250~10 mJy....
[Abridged]We exploit a large homogeneous dataset to derive self-consistent picture of IR emission based on the time-dependent 24, 15, 12 and 8micron monochromatic bolometric luminosity functions (LF) over 0<z<2.5 redshift range. Our analysis is combination data from deep Spitzer surveys in VVDS-SWIRE GOODS areas. To our limiting flux S(24)=400microJy derived sample includes 1494 sources, 666 904 sources brighter than S(24)=80microJy are catalogued GOODS-S GOODS-N, respectively, for total...