A5089378783- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Ionosphere and magnetosphere dynamics
- History and Developments in Astronomy
- Radioactive Decay and Measurement Techniques
Osservatorio Astrofisico di Catania
2015-2024
National Institute for Astrophysics
2007-2023
Istituto di Radioastronomia di Bologna
1998-2022
Istituto di Astrofisica Spaziale e Fisica cosmica di Palermo
2022
UNSW Sydney
2019
University of Oxford
2019
Institute for Space Astrophysics and Planetology
2007-2016
Jet Propulsion Laboratory
2005
California Institute of Technology
2005
National Research Council
1998-2000
Thermal images of cold dust in the Central Molecular Zone Milky Way, obtained with far-infrared cameras on board Herschel satellite, reveal a ∼3 × 107 M☉ ring dense and clouds orbiting Galactic center. Using simple toy model, an elliptical shape having semi-major axes 100 60 pc is deduced. The major axis this inclined by about 40° respect to plane sky oriented perpendicular Bar. appears trace system stable x2 orbits predicted for barred potential. Sgr A⋆ displaced geometrical center symmetry...
EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The primary goal of to make deep (rms ~ 10 microJy/beam) entire Southern Sky at 1.3 GHz, extending as far North +30 degrees declination, with resolution arcsec. expected detect and catalogue about 70 million galaxies, including typical star-forming galaxies up z~1, powerful starbursts even greater redshifts, AGNs edge visible Universe. It will undoubtedly discover...
(Abridged) We present the first public release of high-quality data products (DR1) from Hi-GAL, {\em Herschel} infrared Galactic Plane Survey. Hi-GAL is keystone a suite continuum surveys near-IR to radio, and covers five wavebands at 70, 160, 250, 350 500 micron, encompassing peak spectral energy distribution cold dust for 8 < T 50K. This inner Milky Way in longitude range 68{\deg} > l -70{\deg} |b|<1{\deg} latitude strip. Photometric maps have been produced with ROMAGAL pipeline, that...
We present time-resolved broad-band observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during first two years Fermi Gamma-ray Space Telescope mission. While investigating previously reported gamma-ray/optical flare accompanied by a change in optical polarization, we found that emission appears delayed with respect to gamma-ray about 10 days. X-ray reveal pair `isolated' flares separated ~90 days, only weak counterparts. The spectral structure measured...
We present simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard gamma-ray bands. Our unique set has allowed us demonstrate that selection method strongly influences results, producing biases cannot be ignored. Almost all BL Lac objects have been detected by Fermi-LAT, whereas ~40% of flat-spectrum radio quasars (FSRQs) radio, X-ray selected are still below detection limit even after integrating 27 months...
The CORNISH project is the highest resolution radio continuum survey of Galactic plane to date. It 5 GHz part a series multi-wavelength surveys that focus on northern GLIMPSE region (10 deg < l 65 deg), observed by Spitzer satellite in mid-infrared. Observations with Very Large Array B and BnA configurations have yielded 1.5" Stokes I map root-mean-squared noise level better than 0.4 mJy/beam. Here we describe data-processing methods data characteristics, present new, uniform catalogue...
We describe the motivation, design, and implementation of CORNISH survey, an arcsecond-resolution radio continuum survey inner galactic plane at 5 GHz using Very Large Array (VLA). It is a blind coordinated with northern Spitzer GLIMPSE I region covering 10° < l 65° |b| 1° similar resolution. discuss in detail strategy that we employed to control shape synthesised beam across this which covers wide range fairly low declinations. Two snapshots separated by 4h kept elongation less 1.5 over 75%...
Hi-GAL is a large-scale survey of the Galactic plane, performed with Herschel in five infrared continuum bands between 70 and 500 $\mu$m. We present band-merged catalogue spatially matched sources their properties derived from fits to spectral energy distributions (SEDs) heliocentric distances, based on photometric catalogs presented Molinari et al. (2016a), covering portion plane $-71.0^{\circ}< \ell < 67.0^{\circ}$. The contains 100922 regular SED, 24584 which show $\mu$m counterpart are...
The ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) Project led by the Italian National Institute for Astrophysics (INAF) is developing and will deploy at Observatorio del Teide mini-array (ASTRI Mini-Array) composed of nine telescopes similar to small-size dual-mirror Schwarzschild-Couder telescope (ASTRI-Horn) currently operating on slopes Mt. Etna in Sicily. Mini-Array surpass current Cherenkov array differential sensitivity above few tera-electronvolt (TeV), extending...
The ASTRI Mini-Array (MA) is an INAF project to build and operate a facility study astronomical sources emitting at very high-energy in the TeV spectral band. MA consists of group nine innovative Imaging Atmospheric Cherenkov telescopes. telescopes will be installed Teide Astronomical Observatory Instituto de Astrofisica Canarias (IAC) Tenerife (Canary Islands, Spain) on basis host agreement with INAF. Thanks its expected overall performance, better than those current telescopes' arrays for...
ABSTRACT We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half (251° ≤l ≤ 358° and 2° 61° at |b| $1{_{.}^{\circ}}5$). SMGPS is largest, most sensitive, highest angular resolution 1 plane yet carried out, with an 8 arcsec broad-band root-mean-square sensitivity ∼10–20 μJy beam−1. Here, we describe first publicly available data release from which comprises cubes frequency-resolved images over 908–1656 MHz, power-law fits to images, zeroth moment...
The radio quasar 3C 454.3 underwent an exceptional optical outburst lasting more than 1 year and culminating in spring 2005. maximum brightness detected was R = 12.0, which represents the most luminous state thus far observed (M_B ~ -31.4). In order to follow emission behaviour of source detail, a large multiwavelength campaign organized by Whole Earth Blazar Telescope (WEBT). Continuous optical, near-IR monitoring performed several bands. ToO pointings Chandra INTEGRAL satellites provided...
Context. The quasar 3C 279 is among the most extreme blazars in terms of luminosity and variability flux at all wavebands. Its variations polarization are quite complex therefore require intensive monitoring observations multiple wavebands to characterise interpret observed changes.
Aims. Since the CGRO operation in 1991–2000, one of primary unresolved questions about blazar γ-ray emission has been its possible correlation with low-energy (in particular optical) emission. To help answer this problem, Whole Earth Blazar Telescope (WEBT) consortium organized GLAST-AGILE Support Program (GASP) to provide optical-to-radio monitoring data be compared detections by AGILE and GLAST satellites. This new WEBT project started early September 2007, just before a strong detection...
In the lead-up to Square Kilometre Array (SKA) project, several next-generation radio telescopes and upgrades are already being built around world. These include APERTIF (The Netherlands), ASKAP (Australia), eMERLIN (UK), VLA (USA), e-EVN (based in Europe), LOFAR Meerkat (South Africa), Murchison Widefield (MWA). Each of these new instruments has different strengths, coordination surveys between them can help maximise science from each them. A continuum survey is planned on with primary...
The recent data collected by {\it Herschel} have confirmed that interstellar structures with filamentary shape are ubiquitously present in the Milky Way. Filaments thought to be formed several physical mechanisms acting from large Galactic scales down sub-pc fractions of molecular clouds, and they might represent a possible link between star formation large-scale structure Galaxy. In order study this potential link, statistically significant sample filaments spread throughout Galaxy is...
We present results from the most comprehensive radio monitoring campaign towards closest star to our Sun, Proxima Centauri. report 1.1 3.1 GHz observations with Australian Telescope Compact Array over 18 consecutive days in April 2017. detect emission Centauri for of observing sessions, which spanned $\sim$1.6 orbital periods planet b. The is stronger at low-frequency band, centered around 1.6 GHz, and consistent expected electron-cyclotron frequency known star's magnetic field intensity...
In this paper, we present the analysis of incoherent non-thermal radio emission from a sample hot magnetic stars, ranging early-B to early-A spectral type. Spanning wide range stellar parameters and wind properties, these stars display commonality in their which presents new challenges scenario as originally conceived. It was thought that relativistic electrons, responsible for emission, originate current sheets formed where opens field lines. However, true mass-loss rates cooler are too...
Aims. The Whole Earth Blazar Telescope (WEBT) consortium has been monitoring the blazar 3C 454.3 from radio to optical bands since 2004 study its emission variability properties.
The blazar 3C 454.3 underwent an unprecedented optical outburst in spring 2005. This was first followed by a mm and then cm radio outburst, which peaked February 2006. We report on follow-up observations the WEBT to study multiwavelength emission post-outburst phase. XMM-Newton July December 2006 added information X-ray UV fluxes. source faint state. flux at higher frequencies showed fast decreasing trend, represents tail of big outburst. It quiescent state, common all frequencies. In...
The GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) monitored BL Lacertae in 2008-2009 at radio, near-IR, and optical frequencies. During this period, high-energy observations were performed by XMM-Newton, Swift, Fermi. We analyse these data with particular attention to calibration Swift UV data, apply a helical jet model interpret source broad-band variability. GASP-WEBT show an flare 2008 February-March, oscillations several tenths mag on few-day time scale...
<i>Context. <i/>Since 2001, the radio quasar 3C 454.3 has undergone a period of high optical activity, culminating in brightest state ever observed, during 2004-2005 outburst. The Whole Earth Blazar Telescope (WEBT) consortium carried out several multifrequency campaigns to follow source behaviour.<i>Aims. <i/>The GLAST-AGILE Support Program (GASP) was born from WEBT provide long-term continuous optical-to-radio monitoring sample <i>γ<i/>-loud blazars, operation AGILE and GLAST (now known as...
Since 1997, BL Lacertae has undergone a phase of high optical activity, with the occurrence several prominent outbursts. Starting from 1999, Whole Earth Blazar Telescope (WEBT) consortium organized various multifrequency campaigns on this blazar, collecting tens thousands data points. One main issues in study huge dataset been search for correlations between and radio flux variations, possible periodicities light curves. The analysis assembled during first four (comprising also archival to...