Conveners
Gamma-Ray and Multi-Messenger Astronomy
- Ulisses Barres de Almeida (Centro Brasileiro de Pesquisas Físicas)
Gamma-Ray and Multi-Messenger Astronomy
- Ulisses Barres de Almeida (Centro Brasileiro de Pesquisas Físicas)
Gamma-Ray and Multi-Messenger Astronomy
- Carla Aramo (Istituto Nazionale di Fisica Nucleare)
Gamma-Ray and Multi-Messenger Astronomy
- Carla Aramo (Istituto Nazionale di Fisica Nucleare)
During the design of the silicon plane calorimeter of the TS93 balloon experiment, we realized that a detector consisting of silicon planes interspersed with converter planes would be an excellent gamma ray detector. We therefore designed the GILDA experiment which would be the starting point for the AGILE and Fermi experiments. During the talk, I will therefore describe the birth of gamma...
In the year 2024, the Fermi Gamma-ray Space Telescope is celebrating its 16th year of operation. The Large Area Telescope (LAT) is the main instrument onboard the Fermi satellite and is designed to be sensitive to gamma rays in the energy range from about 20 MeV up to the TeV regime. From its launch, the LAT has collected more than 4.53 billion photon events, providing crucial information to...
The current generation of Imaging Atmospheric Cherenkov Telescopes (IACTs) has been taking data for more than 20 years with an extraordinary performance that overcomes that of the previous generation by a factor of a few. Discoveries of sources like Gamma Ray Bursts, pulsars or novae and the identification of elusive PeVatrons in the Very High Energy regime would have not been possible without...
The “CTA+” is a research program proposed by INAF, INFN, and Italian universities, in the context of the Italian Resilience and Recovery Plan (PNRR). The program, led by INAF, is aimed at enhancement of the Southern Cherenkov Telescope Array Observatory (CTAO-S) site to be constructed at Paranal, Chile. The approved and funded program has formally begun on January 1st, 2023, and must be...
The CTAO (Cherenkov Telescope Array Observatory) will be the world's largest ground-based gamma-ray observatory to explore the extreme Universe, which will open to all scientific communities as a resource for data from unique, high-energy astronomical observation. Currently, the Obsevatory is entering a new phase of growth, which is flourishing in 2024 with a significant increase in personnel...
In December 2023 the Large-Sized Telescope prototype (LST-1) of the Cherenkov Telescope Array Observatory (CTAO) observed the distant (z=0.997) Flat Spectrum Radio Quasar (FSRQ) OP 313 following an alert of increased activity by the Fermi-LAT Space Telescope. Thanks to its very low energy threshold and large effective area LST-1 detected very-high-energy (VHE, E>100 GeV) emission from OP 313....
The Schwarzschild Couder Telescope (SCT) is a dual mirror medium-sized telescope proposed for the Cherenkov Telescope Array Observatory (CTAO), the next-generation very-high energy (from about 20 GeV to 300 TeV) gamma-ray observatory. The innovative design of SCT consists of a dual-mirror optics and a high resolution camera with a field of view (FoV) of 8 degrees squared, which will allow...
Extragalactic surveys search for unexpected and serendipitous phenomena, resulting in sources catalogues of unvaluable scientific interest. A Very High Energy survey would be able to add data in a still mostly unknown energy band, finding crossmatches for existing X-ray sources and improving their modelling.
The purpose of this work is to understand if, among the blazars not detected by...
The complementary information carried by photons, gravitational waves, neutrinos and cosmic rays about individual cosmic sources and source populations provides a very powerful tool for studying the properties of the Universe. In the extreme energy regime, above $10^{17}$ eV, the Pierre Auger Observatory plays a central role in multimessenger astronomy, thanks to its ability to distinguish...
The generic unification model to account for the observed neutrinos with energies greater than ~ 100 TeV and UHECRs we had constructed can evaluate whether a given astronomical object class is qualified as the common origin of UHECRs and neutrinos. In this talk, we discuss which objects among the known astronomical class meet the criteria for UHECR accelerators in the unified UHE particle...
In 2013, the IceCube collaboration announced the detection of a diffuse high-energy astrophysical neutrino flux. The origin of this flux is still largely unknown. The most significant individual source is the close-by Seyfert galaxy NGC 1068 at 4.2-sigma level with a soft spectral index. To identify sources based on their counterpart, IceCube releases realtime alerts corresponding to neutrinos...
High energy γ-ray observations are an essential probe of cosmic-ray acceleration mechanisms. The detection of the highest energy γ rays and the shortest timescales of variability are the key to improve our understanding of the acceleration processes and the environment of the cosmic accelerators. The High Altitude Water Cherenkov (HAWC) experiment is a large field-of-view, multi-TeV, γ-ray...
The SWGO collaboration is proposing the construction of a wide field of view observatory to explore the Southern hemisphere sky in the 100 GeV-1 PeV energy range. Nowadays only the HAWC and LHAASO experiments operate with these characteristics, both are in the Northern hemisphere, while the Southern hemisphere sky is not covered by such an observatory. The array will be located in a site at...
The International Virtual Observatory Alliance (IVOA) plays a pivotal role in advancing the FAIR principles within the domain of astrophysics, ensuring that scientific data is Findable, Accessible, Interoperable, and Reusable (FAIR). The IVOA establishes standardized models for data and metadata, and data access protocols. Using Virtual Observatory (VO) compatible tools, it enables seamless...
The CSES-Limadou collaboration, responsible for the development and operation of High Energy Particle Detectors (HEPD) aboard the China Seismo-Electromagnetic Satellites (CSES), has significantly propelled the study of Gamma-Ray Bursts (GRBs). Initially, utilizing the HEPD-01 detector onboard CSES-01, our collaboration published findings on five GRB events, revealing the instrument's...
The gamma-ray blazars B2 1811+31 and GB6 J1058+2817 exhibited strong flaring activity in 2020 and 2021, respectively. These high states were observed by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope in the high-energy gamma-ray band (HE, 100 MeV < E < 100 GeV), triggering observations in the very-high-energy gamma-ray band (VHE, E > 100GeV) with the MAGIC telescopes, in...
The first interactions of photon-induced showers are of electromagnetic nature, and the transfer of energy to the hadron/muon channel is reduced with respect to the bulk of hadron-induced showers. This results in a lower number of secondary muons. Additionally, as the development of photon showers is delayed by the typically small multiplicity of electromagnetic interactions, their maximum of...
The discovery of high-energy astrophysical neutrinos by IceCube has opened a new window to study some of the most energetic cosmic sources and their ability to accelerate particles to extreme energies, in particular hadronic cosmic rays. These high-energy neutrinos should be accompanied by gamma rays at production, so their joint detection (or a lack of it) can cast light on the properties of...
