A. Giuliani
A5030906381- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- SAS software applications and methods
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Lightning and Electromagnetic Phenomena
- Medical Imaging Techniques and Applications
- Earthquake Detection and Analysis
- Stellar, planetary, and galactic studies
National Institute for Astrophysics
2015-2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
2006-2024
University of Turku
2023
Durham University
2023
Astronomical Observatory of Rome
2021-2023
Istituto di Astrofisica Spaziale e Fisica cosmica di Palermo
2023
Brera Astronomical Observatory
2010-2023
Osservatorio Astronomico di Padova
2023
Agenzia Spaziale Italiana
2023
Niels Brock
2023
(Abridged) We have conducted a detailed investigation of the broad-band spectral properties \gamma-ray selected blazars Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated gamma-ray spectra with Swift, radio, infra-red, optical and other hard X-ray/gamma-ray data, collected within three months LBAS data taking period, we were able to assemble high-quality quasi-simultaneous Spectral Energy Distributions (SED) for 48 blazars.The SED these sources is similar that...
<i>Context. <i/> AGILE is an Italian Space Agency mission dedicated to observing the gamma-ray Universe. The AGILE's very innovative instrumentation for first time combines a imager (sensitive in energy range 30 MeV–50 GeV), hard X-ray 18–60 keV), calorimeter 350 keV–100 MeV), and anticoincidence system. was successfully launched on 2007 April 23 from Indian base of Sriharikota inserted equatorial orbit with low particle background.<i>Aims. <i/>AGILE provides crucial data study active...
The well known Crab Nebula is at the center of SN1054 supernova remnant. It consists a rotationally-powered pulsar interacting with surrounding nebula through relativistic particle wind. emissions originating from and have been considered to be essentially stable. Here we report detection strong gamma-ray (100 MeV-10 GeV) flares observed by AGILE satellite in September, 2010 October, 2007. In both cases, unpulsed flux increased factor 3 compared non-flaring flux. flare luminosity short...
We report the detection by Astrorivelatore Gamma a Immagini Leggero (AGILE) satellite of terrestrial gamma ray flashes (TGFs) obtained with minicalorimeter (MCAL) detector operating in energy range 0.3–100 MeV. select events typically lasting few milliseconds spectral and directional selections consistent TGF characteristics previously reported other space missions. During period 1 June 2008 to 31 March 2009 we detect 34 high‐confidence showing millisecond durations geographical distribution...
We present the AGILE gamma-ray observations in energy range 50 MeV - 10 GeV of supernova remnant (SNR) W44, one most interesting systems for studying cosmic-ray production. W44 is an intermediate-age SNR (20, 000 years) and its ejecta expand a dense medium as shown by prominent radio shell, nearby molecular clouds, bright [SII] emitting regions. extend our analysis to energies substantially lower than previous measurements which could not conclusively establish nature radiation. find that...
Strong electric discharges associated with thunderstorms can produce terrestrial gamma-ray flashes (TGFs), i.e., intense bursts of x rays and $\ensuremath{\gamma}$ lasting a few milliseconds or less. We present in this Letter new TGF timing spectral data based on the observations Italian Space Agency AGILE satellite. determine that emission above 10 MeV has significant power-law component reaching energies up to 100 MeV. These results challenge theoretical models runaway electron...
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s and beyond. AMEGO combines high sensitivity 200 keV 10 GeV energy range with wide field of view, good spectral resolution, polarization sensitivity. Therefore, key study astrophysical objects have unique signatures gamma-ray regime, such as neutron star mergers, supernovae, flaring active galactic nuclei....
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...
The Supernova Remnant (SNR) IC 443 is an intermediate-age remnant well known for its radio, optical, X-ray and gamma-ray energy emissions. In this Letter we study the emission above 100 MeV from as obtained by AGILE satellite. A distinct pattern of diffuse in range MeV-3 GeV detected across SNR with prominent maximum (source "A") localized Northeastern shell a flux F = (47 \pm 10) 10^{-8} photons cm^{-2} s^{-1} MeV. This location site strongest shock interaction between blast wave dense...
We present the first catalog of high-confidence <i>γ<i/>-ray sources detected by AGILE satellite during observations performed from July 9, 2007 to June 30, 2008. Cataloged were merging all available data over entire time period. AGILE, launched in April 2007, is an ASI mission devoted 30 MeV–50 GeV energy range, with simultaneous X-ray imaging capability 18–60 keV band. This based on Gamma-Ray Imaging Detector (GRID) for energies greater than 100 MeV. For catalog, we adopted a conservative...
We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 June 23. A $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on 9--15, $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than average flux observed EGRET a factor $\sim$3, but still consistent highest flux. In hard X-rays (20-60 keV)...
On 2009 January 22 numerous strong bursts were detected from the anomalous X-ray pulsar 1E 1547.0-5408. Swift/XRT and XMM-Newton/EPIC observations carried out in following two weeks led to discovery of three rings centered on this source. The ring radii increased with time expansion law expected for a short impulse X-rays scattered by dust clouds. Assuming different models composition grain size distribution, we fit intensity decay each as function at energies, obtaining tight constrains...
We present the results of extensive observations by gamma-ray AGILE satellite Galactic region hosting Carina nebula and remarkable colliding wind binary Eta Carinae (η Car) during period 2007 July–2009 January. detect a source (1AGL J1043−5931) consistent with position η Car. If 1AGL J1043−5931 is associated Car system, our data provide long sought first detection above 100 MeV binary. The average flux integrated over preperiastron July–2008 October Fγ = (37 ± 5) × 10−8 ph cm−2 s−1...
We report on 18 months of multiwavelength observations the blazar 3C 454.3 (Crazy Diamond) carried out in July 2007-January 2009. show results AGILE campaigns which took place May-June 2008, July-August and October 2008-January During May 2009 period, source average flux was highly variable, from an gamma-ray F(E>100MeV) > 200E-8 ph/cm2/s to F(E>100MeV)~80E-8 The spectrum between 100 MeV 1 GeV can be fit by a simple power law (Gamma_GRID ~ 2.0 2.2). Only 3-sigma upper limits derived 20-60...
Since 2005, the blazar 3C 454.3 has shown remarkable flaring activity at all frequencies, and during last four years it exhibited more than one γ-ray flare per year, becoming most active in sky. We present for first time multi-wavelength AGILE, Swift, INTEGRAL, GASP-WEBT data collected order to explain extraordinary of which occurred 2010 November. On November 20 (MJD 55520), reached a peak flux (E >100 MeV) Fpγ = (6.8 ± 1.0) × 10−5 photons cm−2 s−1 on timescale about 12 hr, factor six...
We present the characteristics of 308 terrestrial gamma ray flashes (TGFs) detected by Minicalorimeter (MCAL) instrument on board AGILE satellite during period March 2009–July 2012 in ±2.5° latitude band and selected to have maximum photon energy up 30 MeV. The events are analyzed compared observational framework established two other currently active missions capable detecting TGFs from space, RHESSI Fermi. A detailed model MCAL dead time is presented, which fundamental properly interpret...
A long gamma-ray burst (GRB) is observed when the collapse of a massive star produces an ultrarelativistic outflow pointed toward Earth. Gamma-ray spectra GRBs are smooth, typically modeled by joint power-law segments describing continuum, with no detected spectral lines. We report significant (>6σ) narrow emission feature at ~10 mega-electron volts (MeV) in spectrum bright GRB 221009A. Over 80 seconds, it evolves energy (~12 to ~6 MeV) and luminosity (~1.1 <0.43 × 10
We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy gamma-ray emission in June 2008. The signal was detected by VERITAS 2008 7-8 with flux F(>200 GeV) = (5.7+-0.6)x10^-11 cm-2s-1, about three times brighter than discovery March. initial detection this flare at energies above 200 GeV followed observations gamma-rays (AGILE, E>100 MeV), and X-rays (Swift XMM-Newton),...
Supernova remnants (SNRs) are believed to be the main sources of Galactic cosmic rays. Molecular clouds associated with SNRs can produce gamma-ray emission through interaction accelerated particles concentrated gas. The middle aged SNR W28, for its system dense molecular clouds, provides an excellent opportunity test this hypothesis. We present AGILE/GRID observations and compare them at other wavelengths (TeV 12CO J=1-->0 line emission). flux detected by AGILE from dominant source W28 is...
We report on the extreme gamma-ray activity from FSRQ PKS 1510-089 observed by AGILE in March 2009. In same period a radio-to-optical monitoring of source was provided GASP-WEBT and REM. Moreover, several Swift ToO observations were triggered, adding important information behaviour optical/UV to hard X-rays. paid particular attention calibration Swift/UVOT data make it suitable blazars spectra. Simultaneous radio gamma rays allowed us study detail correlation among emission variability at...
Gamma-ray emission from the Crab Nebula has been recently shown to be unsteady. In this paper, we study flux and spectral variability of above 100 MeV on different timescales ranging days weeks. addition four main intense day-long flares detected by AGILE Fermi-LAT between 2007 September 2012 September, find evidence for week-long less episodes enhanced gamma-ray that call "waves." Statistically significant "waves" show 1–2 weeks, can occur themselves or in association with shorter flares....