A5069517927- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- GNSS positioning and interference
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Particle Accelerators and Free-Electron Lasers
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Engine and Fuel Emissions
- Radiative Heat Transfer Studies
- earthquake and tectonic studies
- Advancements in Materials Engineering
- Mechanical and Thermal Properties Analysis
- Streptococcal Infections and Treatments
- COVID-19 diagnosis using AI
- Artificial Intelligence in Healthcare
Nicolaus Copernicus University
2014-2024
Institute of Meteorology and Water Management
2018
Nicolaus Copernicus Astronomical Center
2015-2017
European Space Astronomy Centre
2011
We present results from the first attempts to derive various physical characteristics of dusty Wolf-Rayet star WR 48a based on a multi-wavelength view its observational properties. This is done basis new optical and near-infrared spectral observations data archives in optical, radio X-rays. The spectrum acceptably well represented by sum two spectra: WC8 type WN8h type. strength interstellar absorption features spectra near-by stars D2-3 D2-7 (both members open cluster Danks 2) indicates...
The binary neutron star merger event GW170817 was detected through both electromagnetic radiation and gravitational waves. Its afterglow emission may have been produced by either a narrow relativistic jet or an isotropic outflow. High-spatial-resolution measurements of the source size displacement can discriminate between these scenarios. We present very-long-baseline interferometry observations, performed 207.4 days after using global network 32 radio telescopes. apparent is constrained to...
Abstract Fast radio bursts (FRBs) are extremely energetic, millisecond-duration flashes that reach Earth from extragalactic distances. Broadly speaking, FRBs can be classified as repeating or (apparently) non-repeating. It is still unclear, however, whether the two types share a common physical origin and differ only in their activity rate. Here we report on an observing campaign targeted one hyperactive source, FRB 20201124A, for more than 2,000 h using four 25–32 m class telescopes. We...
Very long baseline interferometric (VLBI) localisations of repeating fast radio bursts (FRBs) have demonstrated a diversity local environments: from nearby star-forming regions to globular clusters. Here we report the VLBI localisation FRB 20201124A using an ad-hoc array dishes that also participate in European Network (EVN). In our campaign, detected 18 total at two separate epochs. By combining visibilities both observing epochs, were able localise with 1-$\sigma$ error 4.5 milliarcseconds...
ABSTRACT The repeating fast radio burst (FRB) source FRB 20200120E is exceptional because of its proximity and association with a globular cluster. Here we report 60 bursts detected the Effelsberg telescope at 1.4 GHz. We observe large variations in rate, first ‘burst storm’, where suddenly became active 53 (fluence ≥0.04 Jy ms) occurred within only 40 min. find no strict periodicity arrival times, nor any evidence for source’s activity between observations. storm shows steep energy...
ABSTRACT We present very long-baseline interferometry (VLBI) observations of the hyperactive repeating FRB 20220912A using European VLBI Network (EVN) outside regular observing sessions (EVN-Lite). detected 150 bursts from over two epochs in 2022 October. Combining burst data allows us to localize a precision few milliarcseconds, corresponding transverse scale less than 10 pc at distance source. This precise localization shows that lies closer centre its host galaxy previously found,...
We present a new sample of Compact Steep Spectrum (CSS) sources with radio luminosity below 10^26 W/Hz at 1.4 GHz called the low compact (LLC) objects. The have been selected from FIRST survey and observed MERLIN L-band C-band. main criterion used for selection was objects approximately one third CSS value comparable to FRIs. About 80% resolved about 30% them weak extended emission disturbed structures when compared observations higher sources. studied correlation between power linear size,...
We study the mid-egress eclipse timing data gathered for cataclysmic binary HU Aquarii during years 1993–2014. The (O−C) residuals were previously attributed to a single ∼7 Jupiter mass companion in ∼5 au orbit or stable two-planet system with an unconstrained outermost orbit. present 22 new observations between 2011 June and 2014 July four instruments around world. They reveal systematic deviation of ∼60–120 s from older ephemeris. re-analyse whole set available. Our results provide erratum...
Methanol and water vapour masers are signposts of early stages high-mass star formation but it is generally thought that due to different excitation processes they probe distinct parts stellar environments. Here we present observations the intermediate-mass young object G107.298+5.639, revealing for first time 34.4 d flares 6.7 GHz methanol maser emission alternate with individual features 22 maser. High angular resolution data reveal a few components both species showing periodic behaviour...
Abstract Recently, the Galactic magnetar SGR J1935+2154 has garnered attention due to its emission of an extremely luminous radio burst, reminiscent fast bursts (FRBs). is one most active magnetars, displaying flaring events nearly every year, including outbursts as well short and intermediate bursts. Here, we present our results on properties persistent bursting X-ray from during initial weeks following outburst 2022 October 10. The source was observed with XMM-Newton NuSTAR...
The so-called HYbrid MOrphology Radio Sources (HYMORS) are a class of objects that appear to have mixed Fanaroff-Riley (FR) morphology in single object; i.e. HYMORS has an FR I-type lobe on one side its nucleus and II-type the other side. Because this unique feature given origin morphological dichotomy is still unclear, may possibly play crucial role our understanding FR-dichotomy. As number known quite small, we aimed increase by inspecting few areas sky covered VLA FIRST survey selecting...
To measure the 30-GHz flux densities of 293 sources in Caltech-Jodrell Bank flat-spectrum (CJF) sample. The measurements are part an ongoing programme to spectral energy distributions flat spectrum radio and correlate them with milliarcsecond structures from VLBI other measured astrophysical properties. data were obtained a twin-beam differencing radiometer system mounted on Torun 32-m telescope. has angular resolution 1.2 arcmin. Together literature, have enabled us identify 42 CJF as...
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 purpose of this paper was to provide preliminary data concerning global availability solar energy at the surface Moon. Lack gaseous atmosphere and accompanying phenomena such as precipitations or cloud cover makes Moon’s an extraordinarily advantageous place for harvesting. On other hand, excessive exposure undamped sunlight may cause problems with buildings’ interior overheating increase decay rate photovoltaic cells. Thus, basic information irradiance diurnal insolation specified...
We report the results of a survey 442 planetary nebulae at 30 GHz. The purpose is to develop list as calibration sources which could be used for high frequency in future. For 41 PNe with sufficient data, we test emission mechanisms order evaluate whether or not spinning dust plays an important role their spectra 30-GHz data were obtained twin-beam differencing radiometer, OCRA-p, operation on Torun 32-m telescope. Sources scanned both right ascension and declination. estimated flux densities...
We present new more sensitive high-resolution radio observations of a compact broad absorption line (BAL) quasar, 1045+352, made with the EVN+MERLIN at 5 GHz. They allowed us to trace connection between arcsecond structure and core quasar. The morphology 1045+352 is dominated by knotty jet showing several bends. discuss possible scenarios that could explain such complex morphology: galaxy merger, accretion disk instability, precession jet-cloud interactions. It we are witnessing an ongoing...
The high brightness temperatures, $T_\mathrm{b}\gtrsim 10^{13}$ K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering the interstellar medium may affect such measurements. We quantify properties and sub-mas scale source parameters for quasar B0529+483. Using correlated flux density measurements at 1.7, 4.8, 22 GHz on projected baselines up to 240,000 km we find two characteristic angular scales core, about 100...
We report MERLIN, VLA, OCRA-p, VLBA, Effelsberg and GMRT observations beginning 4.5 days after the discovery of RS Ophiuchi undergoing its 2006 recurrent nova outburst. Observations over first 9 weeks are included, enabling us to follow spectral development throughout three phases remnant development. see dramatic brightening on 4 7 at 6 GHz an accompanying increase in other bands, particularly 1.46 GHz, consistent with transition from initial "free expansion" phase adiabatic expansion...
On the night of October 31, 2015 two bright Southern Taurid fireballs occurred over Poland, being one most spectacular bolides this shower in recent years. The first fireball – PF311015a Okonek was detected by six video stations Polish Fireball Network (PFN) and photographed several bystanders, allowing for precise determination trajectory orbit event. entered Earth's atmosphere with velocity 33.2 ± 0.1 km s−1 started to shine at height 117.88 0.05 km. maximum brightness −16.0 0.4 mag...
The FRI/FRII dichotomy is a much debated issue in the astrophysics of extragalactic radio sources. Study properties HYbrid MOrphology Radio Sources (HYMORS) may bring crucial information and lead to step forward understanding origin dichotomy. HYMORS are rare class double-lobed sources where each two lobes clearly exhibits different FR morphology. This article describes follow-up high resolution VLBA observations five discovered by us HYMORS. main aim was answer questions whether unusual...