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A Search for Solar Gamma-Ray Emission with LHAASO

23 Oct 2026, 16:45
5m
Tianfu Cosmic Ray Research Center

Tianfu Cosmic Ray Research Center

No. 1500 Kezhi Road, Tianfu New Area, Chengdu, China
Poster poster-d

Speaker

文羽 曹(University of Science and Technology of China)

Description

We present a search for gamma-ray emission from the Sun using data collected between 2021 and 2025 with the Water Cherenkov Detector Array (WCDA) of the Large High Altitude Air-shower Observatory (LHAASO). We apply an equal-zenith-angle background method and perform a spatial and spectral likelihood analysis using the WCDA detector response and point-spread function. For the cumulative bin0--6 sample, the best-fit point source is located at $(\Delta\mathrm{RA},\Delta\mathrm{Dec})=(0.10\pm0.17,\,-0.05\pm0.23)^\circ$, consistent with the solar position. The fitted spectrum has a power-law index of $\Gamma=3.22\pm0.15$ and a differential flux normalization of $\phi_0=5.03^{+2.26}_{-1.55}\times10^{-16}\,\mathrm{TeV^{-1}\,cm^{-2}\,s^{-1}}$. The corresponding local test statistic is $\mathrm{TS}=42.6$, equivalent to a local significance of approximately $6.5\sigma$. The likelihood-based significance distributions show a residual positive bias, which is being further investigated. These preliminary results indicate an excess spatially consistent with the solar position.

Primary authors

Kenny Chun Yu Ng(The Chinese University of Hong Kong) 哲 李(高能所) 文羽 曹(University of Science and Technology of China)

Presentation materials

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