Conveners
Astrophysical Gamma
- Luca Latronico (TO)
Astrophysical Gamma
- Luca Latronico (TO)
Astrophysical Gamma
- Luca Latronico (TO)
The Sun is not expected to be a bright gamma-ray source above 1 GeV, due to the moderate strength of solar magnetic fields. However, the Sun may act as a passive gamma-ray source, through the hadronic interaction of galactic cosmic rays with the Solar atmosphere. The Fermi-LAT has detected a bright solar gamma-ray flux, which implies that solar magnetic fields efficiently redirect incoming...
The particle nature of dark matter remains one of the most mysterious and urgent research questions of modern particle physics and cosmology. Despite decades of research, the mass of possible dark matter particles is only constrained to within 80 orders of magnitude or so. Astronomical observations spanning the full electromagnetic spectrum allow to search for dark matter particles across the...
Axion-like particles (ALPs) are light, neutral, (pseudo-)scalar bosons predicted by several extensions of the Standard Model of particle physics such as the String Theory and are supposed to interact primarily only with two photons. In the presence of an external magnetic field photon-ALP oscillations may occur and produce sizable astrophysical effects in the very-high energy (VHE) band....
In this talk some recent results from the Pierre Auger Collaboration
will be presented. These include the measurement of the energy
spectrum of cosmic rays over a wide range of energies, studies of the
cosmic-ray mass composition with the fluorescence and surface detector
of the Observatory, studies on the anisotropies in the arrival
direction of cosmic rays at different scales and the...
The gamma-ray sky has been revealed in the last decade by the Fermi Large Area Telescope (LAT), offering an outstanding picture of our Universe at the highest energies. The majority of this gamma-ray emission has been attributed to known processes involving cosmic-ray interactions with the interstellar medium within our Galaxy. Another important contribution is represented by the gamma-ray...
An excess in the flux of cosmic positrons at Earth above 10 GeV has been measured by Pamela, Fermi-LAT and with unprecedented precision by AMS-02. The observed flux cannot be explained by the production of positrons in the spallation reaction of hadronic cosmic rays (CRs) with the interstellar medium. Various interpretations have been invoked to explain this excess, such as the production in...
The search for electromagnetic counterparts or neutrino emissions from gravitational-wave sources engages a wide scientific community. Here, we outline the pathway that led to the birth of multi-messenger astronomy with the first direct observations of the gravitational-wave signals measured to date, focusing on the new challenges of LIGO and Virgo Observing Run 3 (O3) and the beginning of the...
The very high energy sky comprises many astrophysical sources originating from explosive or flaring events on different timescales, from fraction of seconds to years. These transient sources are largely observed and monitored in different bands of the electromagnetic spectrum, including very high energy (VHE, $E>100$ GeV) gamma rays. Furthermore, transient sources are associated with systems...
The recent discovery of a diffuse neutrino flux of astrophysical origin by IceCube started the search to identify the cosmic sources of this emission. Synergy with other experiments could be a useful mean of investigation and in particular, the combination of neutrino/gamma-ray information is motivated by the fact that both radiations may be produced in the same astrophysical particle-cascades...
While the Fermi gamma-ray telescope lives its 11th year in orbit, new particle and gamma-ray space detectors are in operation as DAMPE (DArk Matter Particle Explorer), or are in the development stage as HERD (High Energy Cosmic Radiation Detector) and e-Astrogam. DAMPE was launched in 2015 by a collaboration of Chinese, Italian and Swiss scientific institutions and performs high-quality...
