I. Sushch
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View article: Supernova remnants in super bubbles acting as cosmic ray accelerators
Supernova remnants in super bubbles acting as cosmic ray accelerators Open
Supernova remnants (SNRs) are often considered the main sites of acceleration of cosmic rays in our Galaxy, possibly up to the ‘knee’. However, their ability to accelerate particles to reach PeV energies is questionable and lacks observati…
View article: How to turn a supernova into a PeVatron
How to turn a supernova into a PeVatron Open
Context. It is important to determine which Galactic cosmic-ray (CR) sources have the ability to accelerate particles to the knee of the CR spectrum at a few peta-electronvolt (PeV). In particular, we need to consider whether supernova rem…
View article: Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35
Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35 Open
We present a re-discovery of G278.94+1.35 as possibly one of the largest known Galactic supernova remnants (SNR) - that we name Diprotodon. While previously established as a Galactic SNR, Diprotodon is visible in our new EMU and GLEAM radi…
View article: Spatio-spectral-temporal modelling of two young pulsar wind nebulae
Spatio-spectral-temporal modelling of two young pulsar wind nebulae Open
Recent observations of a few young pulsar wind nebulae (PWNe) have revealed their morphologies in some detail. Given the availability of spatio-spectral-temporal data, we use our multi-zone (1D) leptonic emission code to model the PWNe ass…
View article: Spatio-spectral-temporal Modelling of Two Young Pulsar Wind Nebulae
Spatio-spectral-temporal Modelling of Two Young Pulsar Wind Nebulae Open
Recent observations of a few young pulsar wind nebulae (PWNe) have revealed their morphologies in some detail. Given the availability of spatio-spectral-temporal data, we use our multi-zone (1D) leptonic emission code to model the PWNe ass…
View article: Particle acceleration, escape, and non-thermal emission from core-collapse supernovae inside non-identical wind-blown bubbles
Particle acceleration, escape, and non-thermal emission from core-collapse supernovae inside non-identical wind-blown bubbles Open
Context. In the core-collapse scenario, supernova remnants (SNRs) evolve inside complex wind-blown bubbles structured by massive progenitors during their lifetime. Therefore, particle acceleration and the emissions from these SNRs can carr…
View article: Gamma-ray detection of newly discovered Ancora supernova remnant: G288.8–6.3
Gamma-ray detection of newly discovered Ancora supernova remnant: G288.8–6.3 Open
Context . The supernova remnant (SNR) G288.8–6.3 was recently discovered as a faint radio shell at high Galactic latitude using observations with the Australian Square Kilometre Array Pathfinder (ASKAP) in the Evolutionary Map of the Unive…
View article: Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35
Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35 Open
We present a re-discovery of G278.94+1.35 a as possibly one of the largest known Galactic supernova remnants (SNRs) – that we name Diprotodon. While previously established as a Galactic SNR, Diprotodon is visible in our new Evolutionary Ma…
View article: The variety of extreme blazars in the <i>AstroSat</i> view
The variety of extreme blazars in the <i>AstroSat</i> view Open
Context. Among the blazar class, extreme blazars have exceptionally hard intrinsic X-ray/TeV spectra, and extreme peak energies in their spectral energy distribution (SED). Observational evidence suggests that the non-thermal emission from…
View article: Probing Orbital Parameters of Gamma-Ray Binaries with TeV Light Curves
Probing Orbital Parameters of Gamma-Ray Binaries with TeV Light Curves Open
Gamma-ray binaries are binary systems in which the energy flux peaks in the gamma-ray energy band. They harbor a compact object (a neutron star or a black hole) orbiting around a massive star, which provides a strong radiation field. It is…
View article: Gamma-ray detection of newly discovered Ancora SNR: G288.8-6.3
Gamma-ray detection of newly discovered Ancora SNR: G288.8-6.3 Open
The supernova remnant (SNR) G288.8-6.3 was recently discovered as a faint radio shell at large Galactic latitude using observations with ASKAP in the EMU survey. Here, we make the first detailed investigation of the $γ$-ray emission from t…
View article: Probing orbital parameters of gamma-ray binaries with TeV light curves
Probing orbital parameters of gamma-ray binaries with TeV light curves Open
Gamma-ray binaries are binary systems where the energy flux peaks in the gamma-ray energy band. They harbour a compact object (a neutron star or a black hole) orbiting around a massive star that provides a strong radiation field. It is bel…
View article: Gamma-ray emission from young supernova remnants in dense environments
Gamma-ray emission from young supernova remnants in dense environments Open
Supernova remnants are known to accelerate cosmic rays on account of their non-thermal emission in different wavebands. However, evidence that SNRs do indeed accelerate cosmic rays to PeV-energies is elusive. The idea emerged that PeV-ener…
View article: Particle acceleration at reflected shocks in supernova remnants
Particle acceleration at reflected shocks in supernova remnants Open
Supernovae remnants (SNRs) are widely considered to be the prime sources of Galactic cosmic rays (CRs). The efficient particle acceleration at the shocks of SNRs is indirectly confirmed by the detection of non-thermal emission across the w…
View article: Probing hadronic cosmic ray acceleration in infrared bright Type IIb SNRs with Fermi-LAT
Probing hadronic cosmic ray acceleration in infrared bright Type IIb SNRs with Fermi-LAT Open
Recent Fermi-LAT observations have revealed the signature of proton acceleration and hadronic emission at GeV energies in various SNRs, possibly due to the interaction with molecular clouds (MCs) in their surroundings. The hadronic interac…
View article: Particle acceleration in core-collapse supernova remnant expanding inside the wind bubble
Particle acceleration in core-collapse supernova remnant expanding inside the wind bubble Open
The complex environments around core-collapse supernova remnants (SNRs) originates from their massive progenitors and shapes the spectra and morphology of non-thermal emissions from the remnants. We study the effects of the flow profiles a…
View article: Limits on compression of cosmic rays in supernova remnants
Limits on compression of cosmic rays in supernova remnants Open
The spectral shape of the gamma-ray emission observed for dynamically old supernova remnants that interact with molecular clouds triggered an exciting scenario of adiabatic compression and farther re-acceleration of Galactic cosmic rays (G…
View article: Limits on compression of cosmic rays in supernova remnants
Limits on compression of cosmic rays in supernova remnants Open
The spectral shape of the gamma-ray emission observed for dynamically old supernova remnants that interact with molecular clouds triggered an exciting scenario of adiabatic compression and farther re-acceleration of Galactic cosmic rays (G…
View article: Core-collapse supernovae in dense environments – particle acceleration and non-thermal emission
Core-collapse supernovae in dense environments – particle acceleration and non-thermal emission Open
Supernova remnants (SNRs) are known to accelerate cosmic rays from the detection of non-thermal emission in radio waves, X-rays, and gamma-rays. However, the ability to accelerate cosmic rays up to PeV energies has yet to be demonstrated. …
View article: Spectral softening in core-collapse supernova remnant expanding inside wind-blown bubble
Spectral softening in core-collapse supernova remnant expanding inside wind-blown bubble Open
Context. Galactic cosmic rays (CRs) are widely assumed to arise from diffusive shock acceleration, specifically at shocks in supernova remnants (SNRs). These shocks expand in a complex environment, particularly in the core-collapse scenari…
View article: Spectral softening in core-collapse supernova remnant expanding inside wind-blown bubble
Spectral softening in core-collapse supernova remnant expanding inside wind-blown bubble Open
Context. Galactic cosmic rays are widely assumed to arise from diffusive shock acceleration, specifically at shocks in supernova remnants (SNRs). These shocks expand in a complex environment, particularly in the core-collapse scenario as t…
View article: Leptonic Nonthermal Emission from Supernova Remnants Evolving in the Circumstellar Magnetic Field
Leptonic Nonthermal Emission from Supernova Remnants Evolving in the Circumstellar Magnetic Field Open
The very-high-energy (VHE; E > 100 GeV) gamma-ray emission observed from a number of supernova remnants (SNRs) indicates particle acceleration to high energies at the shock of the remnants and a potentially significant contribution to Gala…
View article: Morphology of supernova remnants and their halos
Morphology of supernova remnants and their halos Open
Context. Supernova remnants (SNRs) are known to accelerate particles to relativistic energies, on account of their nonthermal emission. The observational progress from radio to gamma-ray observations reveals more and more morphological fea…
View article: SNR G39.2-0.3, an hadronic cosmic rays accelerator
SNR G39.2-0.3, an hadronic cosmic rays accelerator Open
Recent results obtained with gamma-ray satellites have established supernova remnants as accelerators of GeV hadronic cosmic rays, which produce detectable gamma-ray emission through interaction with particles from gas clouds in their surr…
View article: Particle acceleration in supernova remnant expanding inside wind-blown bubble
Particle acceleration in supernova remnant expanding inside wind-blown bubble Open
CONTEXT: Supernova Remnants (SNRs) are considered as the primary sources of galactic cosmic rays (CRs), where CRs are assumed to be accelerated by diffusive shock acceleration (DSA) mechanism. The SNR shocks expand in the complex ambient e…
View article: Morphology of SNRs and their halos
Morphology of SNRs and their halos Open
We use our time-dependent acceleration code RATPaC to study the formation of extended gamma-ray halos around supernova remnants and the morphological implications that arise when the high-energetic particles start to escape from the remnan…
View article: SNR G39.2−0.3, an hadronic cosmic rays accelerator
SNR G39.2−0.3, an hadronic cosmic rays accelerator Open
Recent results obtained with gamma-ray satellites have established supernova remnants as accelerators of GeV hadronic cosmic rays. In such processes, CRs accelerated in SNR shocks interact with particles from gas clouds in their surroundin…
View article: Production of secondary particles in heavy nuclei interactions in supernova remnants
Production of secondary particles in heavy nuclei interactions in supernova remnants Open
Depending on their type, supernova remnants may have ejecta material with high abundance of heavy elements such as carbon or oxygen. In addition, core-collapse supernovae explode in the wind material of their progenitor star that may also …
View article: The Great Markarian 421 Flare of 2010 February: Multiwavelength Variability and Correlation Studies
The Great Markarian 421 Flare of 2010 February: Multiwavelength Variability and Correlation Studies Open
We report on variability and correlation studies using multiwavelength observations of the blazar Mrk 421 during the month of 2010 February, when an extraordinary flare reaching a level of ∼27 Crab Units above 1 TeV was measured in very hi…