Ponente
Descripción
The first LHAASO catalogue, published in 2023, reported the detection of 90 sources above 1 TeV, with angular extensions up to 2 deg. Among the unknown sources detected above 100 TeV by KM2A, 1LHAASO J0056+6346u appears as one of the most promising PeVatron candidates.
More recently, the LHAASO collaboration performed a dedicated study on the source, confirming the detection of the source down to 8 TeV, with a >10σ significance above 100 TeV, and a mild extension of ∼0.2-0.3 deg. The performed modelling suggests that the gamma-ray emission is likely to be generated by a TeV Pulsar Wind Nebula (PWN), powered by an unknown pulsar. However, the hadronic scenario associated with nearby CR accelerators, such as the SNR candidate G124.0+1.4, could not be excluded.
Between 2024 and 2025, the first Large-Sized Telescope (LST-1) of the Cherenkov Telescope Array Observatory (CTAO) started a follow-up observation campaign, collecting data on 1LHAASO J0056+6346u. We performed a 3D likelihood analysis by using and comparing different tools for the background estimation and identified hints of signal over a region overlapping with the WCDA and KM2A reported extended emissions. We analysed 16 years of Fermi-LAT data, but no significant signal was detected in the LHAASO emission regions. In this contribution, we will present the first results of the LST-1 data analysis and the comparison with the Fermi-LAT and LHAASO results.
