A5013924311- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Antenna Design and Optimization
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Space Science and Extraterrestrial Life
- GNSS positioning and interference
- Stellar, planetary, and galactic studies
- Advanced Frequency and Time Standards
- Microwave Engineering and Waveguides
- Scientific Research and Discoveries
- Ionosphere and magnetosphere dynamics
- Space Satellite Systems and Control
- Satellite Communication Systems
- Earthquake Detection and Analysis
- Laser-Plasma Interactions and Diagnostics
- Soil Moisture and Remote Sensing
- Distributed and Parallel Computing Systems
Osservatorio Astronomico di Cagliari
2014-2024
National Institute for Astrophysics
2016-2023
Arcetri Astrophysical Observatory
2018-2021
Istituto di Radioastronomia di Bologna
2021
Osservatorio Astrofisico di Catania
2021
Agenzia Spaziale Italiana
2021
Trieste Astronomical Observatory
2021
Institute of Astrophysics and Space Sciences
2021
Institute of Electrical and Electronics Engineers
2020
We study the intra-cluster magnetic field in poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data optical and X-ray bands. analyze new total intensity polarization observations of obtained Sardinia Radio Telescope (SRT). use SRT combination archival Very Large Array to derive both spectral aging Rotation Measure (RM) images galaxies 3C40A 3C40B embedded 194. The analysis indicates that does not show a major recent merger, but rather agrees scenario...
[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...
ABSTRACT In this work, we study variations in the parabolic scintillation arcs of binary millisecond pulsar PSR J1643−1224 over five years using Large European Array for Pulsars (LEAP). The two-dimensional (2D) power spectrum scintillation, called secondary spectrum, often shows a distribution power, where arc curvature encodes relative velocities and distances pulsar, ionized interstellar medium, Earth. We observe clear arc, which varies throughout year. spectra is inconsistent with single...
We report the detection of diffuse radio emission which might be connected to a large-scale filament cosmic web covering 8deg x area in sky, likely associated with z~0.1 over-density traced by nine massive galaxy clusters. In this work, we present observations region taken Sardinia Radio Telescope. Two clusters field host powerful halo sustained violent ongoing mergers and provide direct proof intra-cluster magnetic fields. order investigate presence synchrotron beyond complex system,...
Context . Radio loud active galactic nuclei (AGN) are episodic in nature, cycling through periods of activity and quiescence. The study this duty cycle has recently gained new relevance because the importance AGN feedback for galaxy evolution. Aims In work we investigate radio B2 0258+35, which was previously suggested to be a restarted based on its morphology. source consists pair kpc-scale jets embedded two large-scale lobes (∼240 kpc) with relaxed shape very low surface brightness,...
ABSTRACT We present the first large sample of scintillation arcs in millisecond pulsars (MSPs), analysing 12 sources observed with Large European Array for Pulsars (LEAP), and Effelsberg 100-m telescope. estimate delays from multipath propagation, measuring significant correlated changes scattering time-scales over a 10 yr time span. Many show compact concentrations power secondary spectrum, which PSRs J0613−0200 J1600−3053 can be tracked between observations, are consistent at fixed angular...
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...
We have observed the Andromeda galaxy, Messier 31 (M31), at 6.7GHz with Sardinia Radio Telescope. mapped radio emission in C-band, re-analyzed WMAP and Planck maps, as well other ancillary data, we derived an overall integrated flux density spectrum from to infrared. This allowed us estimate budget M31. Integrating over whole found strong highly significant evidence for anomalous microwave (AME), level of (1.45+0.17-0.19)Jy peaking frequency ~25GHz. Decomposing into known mechanisms such...
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...
ABSTRACT We present deep total intensity and polarization observations of the Coma cluster at 1.4 6.6 GHz performed with Sardinia Radio Telescope. By combining single-dish data archival Very Large Array observations, we obtain new images central radio halo peripheral relic where properly recover brightness from large-scale structures. At GHz, detect both part in polarization. These are highest frequency available to date for these sources this galaxy cluster. In halo, find a localized spot...
We observed the galaxy cluster CIZA J2242.8+5301 with Sardinia Radio Telescope to provide new constraints on its spectral properties at high frequency. conducted observations in three frequency bands centred 1.4 GHz, 6.6 GHz and 19 resulting beam resolutions of 14$^{\prime}$, 2.9$^{\prime}$ 1$^{\prime}$ respectively. These single-dish data were also combined archival interferometric 1.7 GHz. From images, we measured a flux density ${\rm S_{1.4GHz}=(158.3\pm9.6)\,mJy}$ for central radio halo...
Observations of radio relics at very high frequency (>10 GHz) can help to understand how particles age and are (re-)accelerated in galaxy cluster outskirts magnetic fields amplified these environments. In this work, we present new single-dish 18.6 GHz Sardinia Radio Telescope 14.25 Effelsberg observations the well known northern relic CIZA J2242.8+5301. We detected which shows a length $\sim$1.8 Mpc flux density equal $\rm S_{14.25\,GHz}=(9.5\pm3.9)\,mJy$ S_{18.6\,GHz}=(7.67\pm0.90)\,mJy$...
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 present the status of Sardinia Radio Telescope (SRT) and its forthcoming update planned in next few years. The post-process scenario upgraded infrastructure will allow national international scientific community to use SRT for study Universe at high radio frequencies (up 116 GHz), both single dish interferometric mode. A telescope like SRT, operating frequencies, represents a unique resource community. be ideal mapping quickly with relatively angular resolution extended emissions...
Here we present the hardware and software of inclinometer chosen to be installed on SRT alidade. This is a commercial device which basically uses two pendulum-like sensors measure angles from antenna pointing errors can easily inferred. Such an was plane alidade close elevation axis azimuth tilts due not-perfect flatness rail temperature gradient effects steel beams. Last summer some tests were carried out during night time, allowing first check in measurement set-up aboard SRT, then,...
Space debris (SD) is an important problem for space operations and a hot topic surveillance research. A structured network of radar sensors available worldwide, offering vital information about status. Recently, the Sardinia Radio Telescope (SRT), 64-m dish located in Sardinia, Italy, was introduced European plan SD monitoring. Because SRT devoted to radio astronomy applications not optimized echo detection, need SD-dedicated channel has emerged. In this article, we present detailed...
ABSTRACT We report on the detection of quasi-periodic micro-structure in three millisecond pulsars (MSPs), PSRs J1022+1001, J2145−0750, and J1744−1134, using high time resolution data acquired with Large European Array for Pulsars at a radio frequency 1.4 GHz. The occurrence rate is consistent among pulses different peak flux densities. Using an auto-correlation analysis, we measure periodicity width these pulsars. detected from J1022+1001 J1744−1134 often highly linearly polarized. In PSR...
The discovery of the ubiquity habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, have ushered a renaissance millenia-old quest to answer our most profound question about Universe place within it - Are we alone? Breakthrough Listen Initiative, announced July 2015 as 10-year 100M USD program, is comprehensive effort history quantify distribution advanced, technologically capable life universe. In this white paper, outline...
We describe the design and architecture of PHAROS2, a cryogenically cooled 4-8 GHz Phased Array Feed (PAF) demonstrator with digital beamformer for radio astronomy application. The instrument will be capable synthesizing four independent single-polarization beams by combining 24 active elements an array Vivaldi antennas. upgrade PHAROS (PHased Arrays Reflector Observing Systems), features: a) commercial cryogenic LNAs state-of-the-art performance, b) "Warm Section" signal filtering,...
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...