Conveners
Galactic Sources: - 1
- Silvia Celli (Istituto Nazionale di Fisica Nucleare)
- Alison Mitchell
Galactic Sources: - 2
- Silvia Celli (Istituto Nazionale di Fisica Nucleare)
- Alison Mitchell
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Giovanni Morlino (INAF/Oss. Astrofisico di Arcetri)9/8/22, 1:30 PM
The search of Galactic sources able to accelerate cosmic rays (CR) up to energies of ~PeV (the so-called PeVatrons) is one of the most active research topic in the field of high energy Astrophysics. For decades supernova remnants have been considered the most promising candidates but deep gamma-ray observations and theoretical developments suggest that such sources are unable to produce PeV...
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Andreas Specovius (FAU Erlangen-Nürnberg (ECAP))9/8/22, 1:50 PM
Young massive stellar clusters are extreme environments, and potentially provide the means for efficient particle acceleration. Indeed, they are increasingly considered as being responsible for a significant fraction of cosmic rays (CRs) accelerated within the Milky Way. Westerlund 1, the most massive known young stellar cluster in our Galaxy is a prime candidate for studying this hypothesis....
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Giada Peron (Max Planck Institute of Nuclear physics)9/8/22, 2:10 PM
High-energy $\gamma$ rays, originating from interactions of cosmic rays (CRs) with the interstellar medium (ISM), carry direct information about the spatial and spectral distribution of these relativistic particles. Observations of Fermi-LAT of the diffuse gas unveiled a higher emissivity and a harder spectral index in the inner part of the Galaxy. Analyses of the diffuse emission however are...
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Mischa Breuhaus9/8/22, 2:30 PM
It is generally held that >100 TeV emission from astrophysical objects unambiguously demonstrates the presence of PeV protons or nuclei, due to the unavoidable Klein–Nishina suppression of inverse Compton emission from electrons. However, in the presence of inverse Compton dominated cooling, hard high-energy electron spectra are possible. We show that the environmental requirements for such...
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Francesco Conte (Max Planck Institut for Nuclear Physics, Heidelberg)9/8/22, 2:50 PM
The Galactic Center (GC) is an intriguing lab for non-thermal astrophysics due to its proximity and its transparency in radio, X-ray and γ bands. In addition to hosting a supermassive black hole, a compact luminous young star cluster, and the circumnuclear ring, the central few parsecs of the Milky Way are also notable for hosting a source of cosmic rays extending up to PeV in energy $-$ the...
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Prof. Dario Grasso (University of Pisa)9/8/22, 3:10 PM
The Tibet ASγ and LHAASO collaborations recently provided the first evidence of a diffuse γ-ray emission in the Galaxy up to the PeV from the Galactic plane. Due to the challenges this imposes to current theoretical models it is crucial to carefully study different scenarios of diffuse γ-ray production, specially towards the centre of the Galaxy. In particular, the current models of diffuse...
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Vittoria Vecchiotti9/8/22, 4:00 PM
The Tibet AS$\gamma$ experiment provided the first measurement of the total diffuse gamma-ray emission from the Galactic disk in the sub-PeV energy range.
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Based on analysis of the TeV sources included in the HGPS catalogue, we predict the expected contribution of unresolved pulsar-powered sources in the two angular windows of the Galactic plane observed by Tibet AS$\gamma$.
We show that the... -
Pedro De la Torre Luque (Oskar Klein Centre, Stockholm University)9/8/22, 4:18 PM
TeV halos have become a new class of astrophysical objects which were not predicted before their recent observation. They offer evidence that diffusion around sources (concretely, pulsars) is not compatible with the effective average diffusion that our models predict for the Galaxy. This directly impacts Galaxy formation, our knowledge of the propagation process throughout the Galaxy and our...
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Ole König9/8/22, 4:36 PM
Novae are caused by runaway thermonuclear burning in the hydrogen-rich envelopes of accreting white dwarfs, which leads to a rapid expansion of the envelope and the ejection of most of its mass. Theory has predicted the existence of a ‘fireball’ phase following directly on from the runaway fusion, which should be observable as a short, bright and soft X-ray flash before the nova becomes...
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Alison Mitchell9/8/22, 4:54 PM
Recurrent Novae (RNe) are known to experience multiple eruptions in the form of thermonuclear explosions, due to the accumulation of material accreted by a white dwarf from a binary companion star.
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The well known RN RS Ophiuchi (RS Oph) underwent its latest eruption in 2021 and triggered numerous follow-up observations world wide, including with the High Energy Stereoscopic System... -
David Green (Max Planck Institut für Physik)9/8/22, 5:12 PM
RS Ophiuchi (RS Oph) is a symbiotic recurrent nova that shows eruptive events roughly every 15 years. On August 8th August 2021, RS Oph erupted with its latest outburst. This event was detected with a wide range of multi-wavelength (MWL) instruments from radio up to very-high-energy (VHE) gamma rays. The MAGIC telescopes followed up on optical and high-energy triggers and initiated an...
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