M. N. Iacolina
A5114377361- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Ionosphere and magnetosphere dynamics
- Stellar, planetary, and galactic studies
- GNSS positioning and interference
- High-pressure geophysics and materials
- Antenna Design and Optimization
- Mechanics and Biomechanics Studies
- Planetary Science and Exploration
- Advanced Frequency and Time Standards
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Atomic and Subatomic Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Computational Physics and Python Applications
- Solar Radiation and Photovoltaics
- History and Developments in Astronomy
- Cold Atom Physics and Bose-Einstein Condensates
Agenzia Spaziale Italiana
2017-2024
Osservatorio Astronomico di Cagliari
2008-2024
National Institute for Astrophysics
2014
Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari
2008-2011
University of Palermo
2008-2011
Abstract We report on an observational campaign the bright black hole (BH) X-ray binary Swift J1727.8–1613 centered around five observations by Imaging Polarimetry Explorer. These track for first time evolution of polarization a BH across hard to soft state transition. The 2–8 keV degree decreased from ∼4% ∼3% observations, but angle remained oriented in north–south direction throughout. Based with Australia Telescope Compact Array, we find that intrinsic 7.25 GHz radio aligns polarization....
Abstract We report the first detection of X-ray polarization bright transient Swift J1727.8−1613 with Imaging Polarimetry Explorer. The observation was performed at beginning 2023 discovery outburst, when source resided in hard state. find a time- and energy-averaged degree 4.1% ± 0.2% angle 2.°2 1.°3 (errors 68% confidence level; this translates to ∼20 σ significance detection). This finding suggests that hot corona emitting bulk detected X-rays is elongated, rather than spherical....
[Abridged] The Sardinia Radio Telescope (SRT) is the new 64-m dish operated by INAF (Italy). Its active surface will allow us to observe at frequencies of up 116 GHz. At moment, three receivers, one per focal position, have been installed and tested. SRT was officially opened in October 2013, upon completion its technical commissioning phase. In this paper, we provide an overview main science drivers for SRT, describe outcomes from scientific telescope, discuss a set observations...
We report on the detection of X-ray polarisation in black-hole binary Swift J1727.8$-$1613 during its dim hard spectral state by Imaging Polarimetry Explorer (IXPE). This is first at transition from soft to an binary. find averaged 2$-$8 keV degree (3.3 ${\pm}$ 0.4) % and a corresponding angle 3{\deg} 4{\deg}, which matches detected rising stage outburst, September$-$October 2023, within 1${\sigma}$ uncertainty. The observational campaign complements previous studies this source enables...
In 2016 September, the microquasar Cygnus X-3 underwent a giant radio flare, which was monitored for 6 d with Medicina Radio Astronomical Station and Sardinia Telescope. Long observations were performed in order to follow evolution of flare on an hourly scale, covering six frequency ranges from 1.5 25.6 GHz. The emission reached maximum 13.2 ± 0.7 Jy at 7.2 GHz 10 1 18.6 Rapid flux variations observed high frequencies peak together rapid spectral index: α steepened 0.3 0.6 (with Sν ∝ ν−α)...
The Sardinia Radio Telescope (SRT) is a 64-m, fully-steerable single-dish radio telescope that was recently commissioned both technically and scientifically with regard to the basic observing modes. In order improve scientific capability cover all requirements for an advanced telescope, we developed SArdinia Roach2-based Digital Architecture Astronomy (SARDARA), wide-band, multi-feed, general-purpose, reconfigurable digital platform, whose preliminary setup used in early science program of...
Observations of supernova remnants (SNRs) are a powerful tool for investigating the later stages stellar evolution, properties ambient interstellar medium, and physics particle acceleration shocks. For fraction SNRs, multi-wavelength coverage from radio to ultra high-energies has been provided, constraining their contributions production Galactic cosmic rays. Although emission is most common identifier SNRs prime probe refining models, high-resolution images at frequencies above 5 GHz...
We present new observations of the galaxy cluster 3C 129 obtained with Sardinia Radio Telescope in frequency range 6000-7200 MHz, aim to image large-angular-scale emission at high-frequency radio sources located this galaxies. The data were acquired using recently-commissioned ROACH2-based backend produce full-Stokes cubes an area 1 deg x centered on source 129. modeled and deconvolved telescope beam pattern from data. also measured instrumental polarization patterns correct images for...
Context. The Sun is an extraordinary workbench, on which several fundamental astronomical parameters can be measured with high precision. Among these parameters, the solar radius R ⊙ plays important role in aspects, for instance, evolutionary models. Moreover, it conveys information about structure of different layers that compose interior and its atmosphere. Despite efforts to obtain accurate measurements , subject still debated, are puzzling and/or lacking many frequency ranges. Aims. We...
It is commonly believed that millisecond radio pulsars have been spun up by transfer of matter and angular momentum from a low-mass companion during an X-ray active mass phase. A subclass binaries the accreting pulsars, transient systems show periods quiescence which emission could switch on. The aim this work to search for pulsations three XTE J1751-305, J1814-338, SAX J1808.4-3658, observed their quiescent phases at high frequencies (5 - 8 GHz) in order overcome problem free-free...
The main characteristics in the radio continuum spectra of Supernova Remnants (SNRs) result from simple synchrotron emission. In addition, electron acceleration mechanisms can shape specific ways, especially at high frequencies. These features are connected to age and peculiar conditions local interstellar medium interacting with SNR. Whereas bulk emission is expected up 20–50 GHz, sensitive high-resolution images SNRs above 10 GHz lacking not easily achievable, confused regions Galactic...
We report on a campaign the bright black hole X-ray binary Swift J1727.8$-$1613 centered around five observations by Imaging Polarimetry Explorer (IXPE). This is first time it has been possible to trace evolution of polarization across hard soft state transition. The 2--8 keV degree slowly decreased from $\sim$4\% $\sim$3\% observations, but remained in North-South direction throughout. Using Australia Telescope Compact Array (ATCA), we measure intrinsic 7.25 GHz radio align same direction....
We report on the detection of X-ray polarisation in black-hole binary Swift J1727.8−1613 during its dim hard spectral state by Imaging Polarimetry Explorer (IXPE). This is first at transition from soft to an binary. find averaged 2–8 keV degree (3.3 ± 0.4)% and a corresponding angle 3° ±4°, which matches detected rising stage outburst, September–October 2023, within 1 σ uncertainty. The observational campaign complements previous studies this source enables comparison properties single...
<i>Aims. <i/>The aim of this work is to search for radio signals in the quiescent phase accreting millisecond X-ray pulsars, way giving an ultimate proof recycling model, thereby unambiguously establishing that pulsars are progenitors pulsars.<i>Methods. <i/>To overcome possible free-free absorption caused by matter surrounding their quiescence phase, we performed observations at high frequencies. Making use particularly precise orbital and spin parameters obtained from observations, carried...
Supernova remnants (SNRs) represent a powerful laboratory to study the Cosmic-Ray acceleration processes at shocks, and their relation properties of circumstellar medium. With aim studying high-frequency radio emission investigating energy distribution accelerated electrons magnetic field conditions, we performed single-dish observations large complex Cygnus Loop SNR from 7.0 24.8 GHz with Medicina Sardinia Radio Telescope, focusing on northern filament (NGC 6992) southern shell. Both...
We present a new solar radio imaging system implemented through the upgrade of large single-dish telescopes Italian National Institute for Astrophysics (INAF), not originally conceived observations. During development and early science phase project (2018-2020), we obtained about 170 maps entire disk in 18-26 GHz band, filling observational gap field at these frequencies. These images have typical resolutions 0.7-2 arcmin range brightness temperature sensitivity <10 K. Accurate calibration...
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The Sardinia deep space antenna (SDSA), managed by the Italian Space Agency (ASI) has started its operations in 2017 aiming to provide tracking and communication services for space, near earth, lunar missions, support new challenging radio science experiments. SDSA shares with Radio Telescope (SRT) a part of system infrastructure, but own specific equipment dedicated control center. current capabilities involve X-band (8.4 GHz - 8.5 GHz) reception telemetry from probes within interplanetary...
Existing radio receivers have a very low noise temperature. To further increase the observation speed, new generation of use multi-beam focal plane array (FPA) together with wide bandwidth. In this article, we present front-end and cryogenic design 7-beam FPA double linear polarization receiver for 64-m primary focus Sardinia Radio Telescope. At end show simulated performances measurements down-conversion section.
The noise temperature of existing radio telescope receivers has actually achieved very low values. In any case, there are other practical ways to increase the observational speed a single dish antennas without using longer integration time: observe with multi-beam and large bandwidth receiver. this paper we present front end cryogenic dewar design 5 beams FPA double linear polarization receiver for primary focus 64 m Sardinia Radio Telescope.
In this work, we present preliminary results of radar observations near-Earth Objects (NEOs) carried out by European radio telescopes in the framework Space Agency (ESA) project “NEO observation concepts for systems”, which was aimed to derive functional requirements a system, evaluate available assets perform NEO and carry test campaigns. first part project, performance analysis possible planetary system. Instrumental features, as much issues like impact weather conditions on signal...
Abstract The Sardinia Radio Telescope (SRT) is a modern, fully-steerable 64-m dish located in San Basilio, (Italy). It characterized by an active surface that allows it to cover wide range of radio frequencies (300 MHz 100 GHz). During SRT’s commissioning phase, we installed the hardware and software needed for pulsar observations. Since then, SRT has taken part Large European Array Pulsars Pulsar Timing observations purpose gravitational wave detection. We have new S-band receiver will...