A5043097384- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Ionosphere and magnetosphere dynamics
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Computational Fluid Dynamics and Aerodynamics
- Geomagnetism and Paleomagnetism Studies
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- Fluid Dynamics and Turbulent Flows
- Earthquake Detection and Analysis
- Experimental and Theoretical Physics Studies
- Quantum chaos and dynamical systems
- Precipitation Measurement and Analysis
University of Belgrade
2009-2023
Ben-Gurion University of the Negev
2009
We report the discovery of a new Small Magellanic Cloud Pulsar Wind Nebula (PWN) at edge Supernova Remnant (SNR)-DEM S5. The pulsar powered object has cometary morphology similar to Galactic PWN analogs PSR B1951+32 and 'the mouse'. It is travelling supersonically through interstellar medium. estimate kick velocity be in range 700-2000 km/s for an age between 28-10 kyr. radio spectral index this SNR system flat (-0.29 $\pm$ 0.01) consistent with other objects. infer that putative -1.8, which...
Integrated radio-spectrum of Cas A in continuum was analyzed with special emphasis on possible high frequency spectral curvature. We conclude that the most probable scenario is Planck's new data reveal imprint non-linear particle acceleration case this young Galactic supernova remnant (SNR).
In this paper we present the updated empirical radio surface-brightness-to-diameter ($\Sigma$--$D$) relation for Galactic supernova remnants (SNRs) calibrated using $110$ SNRs with reliable distances. We apply orthogonal fitting procedure and kernel density smoothing in $\Sigma-D$ plane compare results latest theoretical relations derived from simulations of evolution SNRs. argue that best agreement between simulated is achieved if mixed-morphology both, low brightness small diameter, are...
In this paper, we investigate the possibility of significant production thermal bremsstrahlung radiation at radio continuum frequencies that could be linked to some Galactic supernova remnants (SNRs). The main targets for investigation are SNRs expanding in high-density environments. There several indicators from SNRs, such as a flattening higher and absorption lower intrinsic an SNR. work, discuss properties three best candidates testing our hypothesis emission. case IC 443 3C 391, has been...
<p>Dust grains are a common constituent of the Solar system. Dust impacts have been observed using radio and wave instruments onboard spacecraft since 1980s. Voltage waveforms show typical impulsive signals generated by dust grains. We aim at developing models how to be able link electric physical properties impacting dust. To validate model, we use Time Domain Sampler (TDS) subsystem STEREO/WAVES instrument which generates high-cadence time series voltage pulses for each...
Context. Dust impacts have been observed using radio and wave instruments onboard spacecraft since the 1980s. Voltage waveforms show typical impulsive signals generated by dust grains. Aims. We aim at developing models of how are to be able link electric physical properties impacting dust. To validate model, we use Time Domain Sampler (TDS) subsystem STEREO/WAVES instrument which generates high-cadence time series voltage pulses for each monopole. Methods. propose a new model that takes...
Recent observations of the microwave sky, by space telescopes such as Wilkinson Microwave Anisotropy Probe and Planck, have opened a new window into analysis continuum emission from supernova remnants (SNRs). In this paper, different models that can explain characteristic shape currently known integrated radio/microwave spectrum Galactic SNR IC 443 are tested discussed. particular, possibility is emphasized slight bump in remnant around 20–70 GHz genuine it be explained contribution an...
We determined the shock speed in Galactic supernova remnant Cygnus Loop, using proper motion of its optical filaments and latest estimate distance. The was measured by comparing H? images observed two epochs: 1993 (Kitt Peak National Observatory) 2018/2019 (National Astronomical Observatory Rozhen Station Vidojevica). derived for 35 locations along different filaments, which is twice as much earlier studies north-eastern part Loop. For first time, we have radiative this region. Three...
In this paper, the integrated continuum radio spectrum of supernova remnant (SNR) W44 was analyzed up to 70 GHz, testing different emission models that can be responsible for its particular shape. The observations by Planck space telescope made it possible analyze high frequency part from SNRs. Although quality (a scatter data points at same frequencies) prevents us make definite conclusions, possibility spinning dust detection towards is emphasized. addition, a concave-down feature, due...
We present detection of 64 H II regions, three superbubbles and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR were detected by applying [S II]/H? ratio criterion to observations made with 2-m RCC telescope at Rozhen National Astronomical Observatory Bulgaria. In this paper we report coordinates, diameters, H? II] fluxes for objects across fields view 2366 galaxy. Using archival XMM-Newton suggest possible X-ray counterparts candidates. Also,...
It has recently been reported that some of the flux density values for an evolved supernova remnant (SNR) HB 3 (G132.7+1.3) are not accurate enough. In this work we therefore revised analysis possible thermal emission at radio frequencies from SNR using published, corrected values. A model including sum non-thermal (purely synchrotron) and (bremsstrahlung) components is applied to fit integrated spectrum SNR. The contribution component total volume emissivity 1 GHz estimated be ? 37%....
In this work we develop three-dimensional numerical simulations, based on PLUTO code (Mignone et al. ApJS (2012) 198, 7M) in order to simulate hydrodynamic, and radio evolution of supernova remnants non-homogeneous interstellar matter. The remnant, the matter around it, used simulations are 3C396 that has higher concentration medium positioned one side, instead uniform distribution. performed by modifying additions basic code, made previous researchers, such as calculation shock modification...
In this paper we discuss the radio continuum and X-ray properties of so-far poorly studied Galactic supernova remnant (SNR) G5.9+3.1. We present spectral energy distribution (SED) SNR G5.9+3.1 obtained with Murchison Widefield Array (MWA). Combining these new observations surveys at other frequencies, integrated spectrum particular remnant. have also analyzed an archival XMM-Newton observation, which represents first detection emission from The SED is very well explained by a simple...
Aims . In this paper we present new optical observations of the galaxy NGC 185 intended to reveal status supernova remnants (SNRs) in dwarf companion Andromeda galaxy. Previously, it was reported that hosts one SNR. Methods Our deep photometric study with 2m telescope at Rozhen National Astronomical Observatory using narrow-band H α and [S II ] filters revealed complex structure interstellar medium center To confirm classification kinematics detected nebulae, carried out spectroscopic...
We present observations of the nearby tidal dwarf galaxy Holmberg IX in M81 group narrow band [SII] and H? filters, carried out March November 2008 with 2m RCC telescope at NAO Rozhen, Bulgaria. Our search for resident supernova remnants (identified as sources enhanced emission relative to their emission) this yielded no kind, besides M&H 10-11 or HoIX X-1. Nevertheless, we found a number objects significant that probably represent uncatalogued HII regions.
The problem of extinction is the most important issue to be dealt with in process obtaining true absolute magnitudes core-collapse (including stripped-envelope) supernovae (SNe). plane-parallel model, widely used past, was shown not describe adequately. We try apply an alternative model which introduces radial dependance parent galaxies supernovae. For calculating our Galaxy we use two different methods and compare results obtained. Our analysis primarily focused on a chosen sample...
Abstract The shock waves are important features in the analysis of transonic magnetohydrodynamical (MHD) flows where thermal radiation could also be significant. In this paper effects black-body on non-relativistic an ideal MHD model for optically thick case discussed. Distilled conditions were derived and discussed a fixed ratio specific heats gas (γ) to total pressure ( b ). special case, when jumps γ and/or allowed, was considered.