29th European Cosmic Ray Symposium (ECRS 2026)

Session

Parallel session - MM

2 Jul 2026, 16:30

Salon Peregrinos (Hospederia San Martin Pinario)

22. Cygnus X-3 Revisited

Alan Andrew Watson

02/07/2026, 16:30

MM - Multimessenger: Gamma-rays, Neutrinos, Dark Matter

Oral contribution

Cygnus X-3 Revisited
A A Watson
School of Physics and Astronomy, University of Leeds, UK
a.a.watson@leeds.ac.uk
During the 1980s there were reports of emission of γ-rays at TeV and PeV energies from the X-ray binary system, Cygnus X-3. However, following these claims, more detailed studies with purpose-built detectors, such as those with the GREX array at Haverah Park and with the much...

30. Search for gamma-ray lines and boxes with the Fermi Large Area Telescope

Francesco Loparco (Universita e INFN, Bari (IT))

02/07/2026, 16:45

1

MM - Multimessenger: Gamma-rays, Neutrinos, Dark Matter

Oral contribution

We search for possible line-like and box-shaped spectral features in the Galactic gamma-ray spectra measured by the Fermi Large Area Telescope in its first 17 years of operation in the 1 GeV – 1 TeV energy range. Such features could be produced by dark matter particles accumulated in the Milky Way halo, which could either self-annihilate or decay, yielding gamma rays in the final state....

1. Searching for UHE photons in background-dominated data

Costanza Marinelli (Gran Sasso Science Institute, Istituto Nazionale di Fisica Nucleare)

02/07/2026, 17:00

MM - Multimessenger: Gamma-rays, Neutrinos, Dark Matter

Oral contribution

We present a new statistical approach to search for ultra-high-energy photons in extensive air-shower data, aimed at enhancing sensitivity in regimes dominated by hadronic background, where the identification of individual photon candidates is challenging. The method quantifies the collective deviation of the data from the background expectation through a likelihood-ratio hypothesis test...

6. Search for UHE photon sources using direction-time clustering algorithms with a BDT particle discriminant

Dr Chaitanya Priyadarshi (Instytut Fizyki Jadrowej PAN, Kraków)

02/07/2026, 17:15

MM - Multimessenger: Gamma-rays, Neutrinos, Dark Matter

Oral contribution

Direction-time clustering methods for neutral particle searches are motivated by the possibility that ultra-high-energy (UHE) neutral particles are produced during flaring periods of various astrophysical sources. In this scenario, clusters of events correlated in both arrival direction and time would be generated, which, when observed, would indicate a neutral-particle flare, and a...

98. ACME - Astrophysical Center for Multimessenger Studies in Europe

Enrique Zas

02/07/2026, 17:30