Speaker
Description
The "Dragonfly" Pulsar Wind Nebula and its surroundings is a complex region with several HE to UHE gamma-ray point-like and diffuse sources accompanied by their multi-wavelength counterparts. MILAGRO discovered the VHE emission in 2012, making it the second brightest MILAGRO source in the northern hemisphere. The region was later resolved into more VHE sources by VERITAS, revealing a complex nature and suggesting an energy-dependent morphology around the core source VER 2019+368. Recently, the LHAASO observatory detected photons with energies up to 270 TeV, opening up the possibility of particle acceleration up to PeV energies. As one of the brightest and hardest sources in the LHAASO catalog, VER 2019+368 is an ideal candidate for testing the capabilities of the Single-Mirror Small Size Telescope (SST-1M) to detect extended sources.
The SST-1M is a small Cherenkov telescope designed to detect gamma rays with energies greater than about 1 TeV. The optical design of the SST-1M follows the Davies-Cotton concept to ensure good off-axis performance. The camera consists of 1296 silicon photomultiplier (SiPM) pixels and a fully digital trigger and readout system. The SiPM technology allows high night sky background operation, significantly increasing the duty cycle compared to standard photomultipliers. Two SST-1M telescope prototypes were installed in Ondrejov, Czech Republic, in 2022, and stereoscopic observations of astrophysical gamma-ray sources have been performed since then.
In this contribution, we present preliminary results of the first observing campaign of the VER 2019+368 region, performed with SST-1M from April to November 2024, resulting in 140 h of stereo data. We present the data analysis, focusing on the morphological and spectroscopic study of the region. We also present the off-axis performance of SST-1M in the context of the prospects for detecting extended galactic gamma-ray sources.
| Collaboration(s) | SST-1M Collaboration |
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