C. Trigilio
A5065040722- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Ionosphere and magnetosphere dynamics
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Particle accelerators and beam dynamics
- Molecular Spectroscopy and Structure
- History and Developments in Astronomy
Osservatorio Astrofisico di Catania
2015-2024
National Institute for Astrophysics
2006-2018
Institute for Space Astrophysics and Planetology
2007-2015
Istituto di Radioastronomia di Bologna
1998-2009
North Atlantic Treaty Organization
1993
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...
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 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...
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...
We present a catalogue of extended radio sources from the SARAO MeerKAT Galactic Plane Survey (SMGPS). Compiled 56 survey tiles and covering approximately 500 deg^2 across first, third, fourth quadrants, includes 16534 diffuse with areas larger than 5 synthesised beams. Of them, 3891 (24% total) are confidently associated known radio-emitting objects in literature, such as regions, supernova remnants, planetary nebulae, luminous blue variables, Wolf-Rayet stars. A significant fraction...
We have studied the growth of shell-like radio structure supernova SN1993J in M81 from September 1993 through October 2003 with very-long-baseline interferometry (VLBI) observations at wavelengths 3.6, 6, and 18cm. For this purpose, we developed a method to accurately determine outer radius (R) any circularly symmetric compact like SN1993J. The source remains (with deviations circularity under 2%) over almost 4000 days. characterize decelerated expansion SN 1993J approximately day 1500 after...
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...
We present multiwavelength observations of 3C 454.3 from April 2008 to March 2010. The radio optical data are mostly the GASP-WEBT, UV and X-ray Swift, gamma-ray AGILE Fermi satellites. improved calibration optical-UV UVOT OM instruments estimated Lyalpha flux disentangle contributions different components in this spectral region. reveal prominent variability above 8 GHz. In band, amplitude decreases with increasing frequency due a steadier radiation both broad line region an accretion disc....
The quasar-type blazar 4C 38.41 (B3 1633+382) experienced a large outburst in 2011, which was detected throughout the entire electromagnetic spectrum. We present results of low-energy multifrequency monitoring by GASP project WEBT consortium and collaborators, as well those spectropolarimetric/spectrophotometric at Steward Observatory. also analyse high-energy observations Swift Fermi satellites. In optical-UV band, several indicate that there is contribution from QSO-like emission...
A rarity among supernova, SN 1993J in M81 can be studied with high spatial resolution. Its radio power and distance permit VLBI observations to monitor the expansion of its angular structure. This structure was previously revealed shell-like undergoing a self-similar at constant rate. From wavelengths 3.6 6 cm period 6-42 months after explosion, we have discovered that is decelerating. Our measurement this deceleration yields estimates density profiles supernova ejecta circumstellar material...
Context.In spring 2005 the blazar 3C 454.3 was observed in an unprecedented bright state from near-IR to hard X-ray frequencies. A mm outburst peaked June–July 2005, and it followed by a flux increase at high radio
The quasar 3C 279 was the target of an extensive multiwavelength monitoring campaign from 2006 January through April. An optical-IR-radio by Whole Earth Blazar Telescope (WEBT) collaboration organized around target-of-opportunity X-ray and soft γ-ray observations with Chandra INTEGRAL in mid-January, additional coverage RXTE Swift XRT. In this paper we focus on results WEBT campaign. source exhibited substantial variability optical flux spectral shape, a characteristic timescale few days....
A multifrequency campaign on the BL Lac object PG 1553+113 was organized by Whole Earth Blazar Telescope (WEBT) in 2013 April-August, involving 19 optical, two near-IR, and three radio telescopes. The aim to study source behaviour at low energies during around high-energy observations Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes April-July. We also analyse UV X-ray data acquired Swift XMM-Newton satellites same period. WEBT satellite allow us detail synchrotron emission...
Aims.A huge multiwavelength campaign targeting the blazar AO 0235+164 was organized by Whole Earth Blazar Telescope (WEBT) in 2003–2005 to study variability properties of source.
Context.The blazar AO 0235+164 was claimed to show a quasi-periodic behaviour in the radio and optical bands past, with main outbursts repeating every 5–6 years. However, predicted 2004 outburst did not occur, further analysis suggested longer time scale, according which next event would have occurred 2006–2007 observing season. Moreover, an extra emission component contributing UV soft X-ray flux detected, whose nature is yet clear. An observed late 2006–early 2007, triggered Whole Earth...
We have observed a small sample of hot post-AGB stars with the InfraRed Array Camera (IRAC) and Spectrograph (IRS) on-board Spitzer Space Telescope. The were selected from literature on basis their far-Infrared excess (i.e., candidates) B spectral type close to ionization envelope). combination our IRAC observations 2MASS IRAS catalog data, along previous radio in cm range (where available) allowed us model SEDs targets find that almost all them at least two shells dust different...