Conveners
Gamma ray astronomy IV
- Krzysztof Nalewajko
Gamma ray astronomy IV
- Martin Pohl (DESY)
Gamma ray astronomy IV
- Martin Pohl
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Markus Boettcher (North-West University)13/01/2022, 11:00
This talk will review recent advances in multi-wavelength observations of blazars as well as indications of associations of very-high-energy neutrino events with blazars. Physics constraints that may be drawn from such associations will be reviewed. Recent work on consistent particle acceleration and time-dependent radiation transfer modeling in mildly relativistic shocks in blazar jets will...
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Łukasz Stawarz (Astronomical Observatory, Jagiellonian University)13/01/2022, 11:40
In this talk I will briefly discuss some recent observational constraints on the magnetization of relativistic jets in AGN jets, and the related issue of the energy dissipation and acceleration of the jet particles to ultra-relativistic energies. I will focus predominantly on the structures beyond the jet formation site, i.e. on the large-scale portions of the outflows, the jet termination...
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Alicja Wierzcholska (The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences), Dorit Glawion13/01/2022, 12:10
The catalogue of TeV gamma-ray emitting objects includes about 90 extragalactic sources, among which only a few belong to the class of radio galaxies or misaligned blazars. This smaller class includes PKS 0625-354, a source detected as TeV gamma-ray emitter already in 2012. Here, we report H.E.S.S. observations of this active galaxy performed in November 2018. The classification of the object...
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Natalia Zywucka (North-West University)13/01/2022, 12:25
We present the results of a preliminary investigation of a potential association of a blazar candidate behind the Large Magellanic Cloud (LMC) and a gamma-ray transient object. The indication of gamma-ray flaring activity in the Fermi-LAT data was detected at the position (RA, decl.) ∼(86.60 deg,-69.02 deg), while the J0545-6846 blazar candidate is located at (RA, decl.) = (86.47 deg, -68.77...
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Gopal Bhatta (Nuclear Institute of Physics PAN, Poland)13/01/2022, 14:10
Blazars, a subset of powerful active galactic nuclei, feature relativistic jet which shine in a broadband electromagnetic radiation, e. g. from radio to TeV emission. Here we present the results of the studies that explore gamma-ray and optical variability properties of a sample of gamma-ray bright sources Several methods of time-series analyses are performed on the decade-long optical and...
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Stella Boula13/01/2022, 14:25
Blazars have their jet pointing towards us and are known for their emission that covers practically all electromagnetic spectrum frequencies. These sources, in some cases, exhibit a correlation between γ-ray and radio emission, especially during flaring episodes. Adopting the hypothesis that high-energy photon emission by relativistic electrons occurs close to the central black hole, we study...
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Kenichi Nishikawa (Alabama A&M University)13/01/2022, 15:50
The properties of relativistic jets, their interaction with the ambient environment, and particle acceleration due to kinetic instabilities are studied self-consistently with Particle-in-Cell simulations. An important key issue is how a toroidal magnetic field affects the evolution of a pair and an electron - proton jet, how kinetic instabilities such as the Weibel instability (WI), the...
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