A5049715305- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Radio Wave Propagation Studies
- Antenna Design and Optimization
- GNSS positioning and interference
- Geophysics and Sensor Technology
- Glass properties and applications
- Radioactive Decay and Measurement Techniques
- Advanced Frequency and Time Standards
- Advanced Control and Stabilization in Aerospace Systems
- Electrical and Electromagnetic Research
- Advanced Research in Science and Engineering
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Magneto-Optical Properties and Applications
- Seismic Waves and Analysis
- Astrophysical Phenomena and Observations
- Magnetic confinement fusion research
Institute of Radio Astronomy
2015-2023
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2023
Observatoire de Paris
2023
Université Paris Cité
2023
Centre National de la Recherche Scientifique
2023
Sorbonne Paris Cité
2023
Sorbonne Université
2023
Université Paris Sciences et Lettres
2023
National Academy of Sciences of Ukraine
2015-2021
Ventspils University of Applied Sciences
2020
This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, performing on-the-fly dynamic spectrum calculations or waveform data recording without loss have been at the UTR-2 telescope, URAN VLBI system, GURT new generation telescope. Here, we detail these developed operation in strong interference environment that prevails range. Data collected with allowed us to discover numerous objects phenomena low frequencies, a summary of...
Interstellar scattering (ISS) of radio pulsar emission can be used as a probe the ionised interstellar medium (IISM) and causes corruptions in timing experiments. Two types ISS phenomena (intensity scintillation pulse broadening) are caused by electron density fluctuations on small scales (< 0.01 AU). Theory predicts that these related, both have been widely employed to study properties IISM. Larger ($\sim$1-100\,AU) cause measurable changes dispersion correlated with observations estimate...
Context. With the advent of multi-wavelength electromagnetic observations neutron stars – spanning many decades in photon energies from radio wavelengths up to X-rays and γ -rays, it has become possible significantly constrain geometry location associated emission regions. Aims. In this work, we use results modelling thermal X-ray PSR J0030+0451 Neutron Star Interior Composition Explorer (NICER) mission phase-aligned -ray pulse profiles an off-centred dipole that is able reproduce light...
Decameter all-sky Survey has been running at UTR-2 radio telescope over the past few years, about 70% of observational data are processed. The is aimed searching for pulsars and transient sources. Present work shows results processing aforementioned part in order to find allowed detecting more than 500 signals. Distributions signals’ parameters (dispersion measures, galactic latitudes, “signal-to-noise-ratios” etc.) obtained, which give reason consider vast majority these pulses signals from cosmic
We present the results of processing first 20% Northern sky pulsars and transients survey using UTR-2 radio telescope. Data is done by an automatic pipeline that detects outputs a large number transient candidates (usually dispersed bursts). have developed multivariate for visual inspection these candidates. By adjustment input parameters observer can substantially increase signal-to-noise ratio detected signals as well discriminate them from residual low-intensity interference with high...
Purpose: A historical review of the experimental baselopment low-frequency radio astronomy in Ukraine, its foundation half a century ago by an outstanding scientist S.Ya. Braude to current state. Design/methodology/approach: The constant progress electronic, computer and digital technologies, information telecommunication theory practice antenna receiving systems design, which introduction enriched hardware methodological ideology construction usage UTR-2, URAN, GURT telescopes, have been...
come from teaching and research institutions in France or abroad, public private centers.L'archive ouverte pluridisciplinaire
This paper presents the low-frequency pulsars and transients survey which is currently being held at decameter radio telescope UTR-2, its data processing stages results of preliminary processing.
PACS numbers: 97.60.Gb, 98.38.Am Purpose: Studying individual burst characteristics recorded by the UTR-2 radio telescope during Decameter pulsar/transient survey of northern sky, based on analysis 70 % primary data. Design/methodology/approach: Individual pulses, extracted from observation data RFI mitigation routines, are analyzed for presence cosmic source properties. Findings: Analysis parameter distributions such as local time pulse detection (due to conditions) and dispersion measure...
PACS numbers: 97.60.Gb, 98.38.Am Purpose: The most challenging problem of transient signal research is to prove their cosmic origin. There no radio telescope at decameter wavelengths, which has an effective area (i.e. instantaneous sensitivity) least close the UTR-2 parameters. This fact excludes possibility confirming origin detected low-intensity signals some other independent this frequency range. Therefore, it impossible overestimate importance carrying out all possible kinds tests check...
The NenuFAR Pulsar Blind Survey (NPBS) is an all-sky survey, searching for pulsars at radio frequencies below 85 MHz with the telescope. Taking into account turnover low in pulsar spectra and widening of their emission cone towards frequencies, we expect approximately 8–20 not already discovered to be detectable by this most which are likely non-standard or unusual parts P − Ṗ diagram (such as, e.g. slow pulsars). According our simulations, feature spectral indices ≲ −3.2 <<85 MHz....
Our paper presents the results of second census pulsars in decametre wave range at UTR-2 radio telescope. Over past ten years, number discovered nearby world has doubled, which made it urgent to search for a low-frequency emission from newly sources. To increase this sensitivity, integration time was doubled compared with first 2010-2013. As result, 20 detected, their flux densities and shape pulses were obtained. The dispersion measure 10 rotation period 8 refined. For several scattering...
In this paper we show a possibility of applying the technique radio astronomical calibration antenna arrays low-frequency telescopes using pulsar emission. A placement two UTR-2 and GURT at one observatory gives us unique joint simultaneous observations in same ionospheric conditions. results B0809+74 are used to illustrate proposed technique.
With the advent of multi-wavelength electromagnetic observations neutron stars, spanning many decades in photon energies, from radio wavelengths up to X-rays and $\gamma$-rays, it becomes possible significantly constrain geometry location associated emission regions. In this work, we use results modelling thermal X-ray PSR~J0030+0451 NICER mission phase-aligned $\gamma$-ray pulse profiles an off-centred dipole able reproduce light-curves these respective bands simultaneously. To aim, deduce...
Purpose: Due to the significant increase of a number pulsars discovered with high-frequency radio telescopes over last ten years and necessity obtain accurate parameters their decameter radiation (as well as identify single pulses detected UTR-2), second census these sources UTR-2 telescope became needed. Design/methodology/approach: Single result first survey transient emission can be anomalously intense recently pulsars. Identification is only possible an information on dispersion measure...
Purpose: The results of studies sporadic radio emission several types space sources, including neutron stars and planets the Solar System, are presented. aim this work is to review latest achievements in study low-frequency System transient signals similar pulsar pulses using UTR-2 telescope. importance development verification methods spaceborne from various sources shown. Design/methodology/approach: different nature based on common set procedures for cleaning records terrestrial frequency...
This paper presents initial results of repeated observations powerful signals' sources - the first-time detection repetitive sporadic radio emission from one these at low frequencies. and other were found in survey Northern sky order to find decameter wave range.
Cutting edge astrophysical studies require more and observing time at low-frequency radio telescopes, which is limited quite expensive. Modern digital signal processing systems still unable to provide affordable computational storage resources allow simultaneous beamforming in a wide frequency range for multiple studies. Low-frequency telescopes of new generation are very flexible could be split into subarrays or groups some do not large antenna effective area high directivity. In this paper...
Pulsars radiate short pulsed signals (a typical period of an ordinary pulsar is about 1 s) that are good probes propagation media. Propagation medium includes magnetosphere, interstellar (ISM), interplanetary (IPM) and the Earth's ionosphere, it has turbulent nature with variation electron density along line-of-sight. During pulses they influenced by free electrons, irregularities concentration magnetic field. It causes effects called frequency dispersion delay, scattering Faraday rotation...
We propose a new method for the determination of rotation measure (RM) pulse sources in decameter wavelength range. This allows us to define RM with accuracy up 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−4</sup> [1–3], which had never been achieved any known methods. The is effective consideration individual pulses, and determine along profile.
Radio telescope UTR-2 has recently accomplished a survey of the northern sky to find pulsars and transient sources radio emission. On one hand, studies in such low-frequency range are very difficult because extremely high influence scattering interstellar medium, strong interference temperature Galactic background. other large dispersion delay allows determine measure (DM) broadband signals with small characteristic length accurately.
Interstellar scattering (ISS) of radio pulsar emission can be used as a probe the ionised interstellar medium (IISM) and causes corruptions in timing experiments. Two types ISS phenomena (intensity scintillation pulse broadening) are caused by electron density fluctuations on small scales (< 0.01 AU). Theory predicts that these related, both have been widely employed to study properties IISM. Larger ($\sim$1-100\,AU) cause measurable changes dispersion correlated with observations...
This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, performing on-the-fly dynamic spectrum calculations or waveform data recording without loss have been at the UTR-2 telescope, URAN VLBI system, GURT new generation telescope. Here we detail these developed operation in strong interference environment that prevails range. Data collected with allowed us to discover numerous objects phenomena low frequencies, a summary of...
This paper presents parameters of the second decameter census pulsars at UTR-2 radio telescope. In addition, first detection results and emission 5 are presented.