The Second LHAASO Collaboration Conference in 2026 & The Academic Symposium for the 10th Anniversary of the LHAASO collaboration

The discovery of twelve ultra-high-energy (UHE) gamma-ray sources by LHAASO opened a new window on the Universe above 100 TeV. The subsequent release of the first LHAASO source catalog (1LHAASO) further expanded the known population of UHE gamma-ray emitters. Building on these achievements, we are conducting a systematic search for gamma-ray sources above 100 TeV using LHAASO-KM2A data, with...

我们引入了一种通过神经网络对LHAASO KM2A天图进行降噪并寻找到更多弱源的的方法. 我们用真实的无源天区作为训练数据, 利用大模型学习天图数据中的时空关联信息, 进而抑制天图中的统计涨落波动. 因为源的形状可以较好的呈现在降噪后的天图中, 我们提出了一种考虑源形状的似然函数以更好地评估显著性, 并基于样本统计分布得到了最终的显著性天图. 我们通过短期数据验证了这套算法发现的弱源的正确性, 并在可靠性不变的前提下, 相比传统方法多发现了若干 5σ 源. 此外, 这套降噪方法还可以用于在复杂源区对多个扩展源成分进行分离拟合.

Motivated by the discovery of very-high-energy (VHE) emission from the low-luminosity AGN NGC 4278, we performed a systematic search for VHE emission from low-luminosity AGNs (LLAGNs). For each source we searched for both a cumulative excess and a time-variable signal; as no significant excess was found, we further carried out a stacking analysis of the LLAGN sample, which likewise yielded no...

Lower bounds on intergalactic magnetic field (IGMF) have been previously derived from gamma-ray data on extreme blazars. These bounds suffer from uncertainty related to the absence of regularly sampled measurements of time-average blazar TeV band spectra.
We use LHAASO telescope to infer time-average TeV band spectrum of an extreme blazar 1ES 1218+304 and derive a lower bound on IGMF from...

A Possible Star-Forming Origin of the Ultrahigh-Energy Gamma-Ray Source 1LHAASO J1814−1636u

Massive star-forming regions are promising sites of Galactic cosmic-ray acceleration to PeV energies. To investigate their connection with ultrahigh-energy gamma-ray emission, we examine the environment of 1LHAASO J1814−1636u, detected above 100 TeV at approximately 7σ, and its possible association...

This is a preliminary LHAASO-WCDA analysis of the high-synchrotron-peaked BL Lac object 1ES 1218+304. Using data collected from March 2021 to July 2025, we construct an eight-day light curve, significance maps, and a time-averaged spectral energy distribution (SED), while considering possible source confusion from the nearby 1ES 1215+303 and NGC 4278. The signal is strongest in the low-$N_{\rm...

The Hubble constant is of paramount importance in astrophysics and cosmology. The precise determination of the Hubble constant is one of the critical problems in modern cosmology. In this poster, we present our preliminary results on measuring the Hubble constant using extragalactic sources observed by LHAASO and Fermi-LAT. By combining observations across a broad energy range, we aim to...

Good angular resolution is essential for resolving the fine structures of gamma-ray sources and improving detection sensitivity, and is therefore crucial for gamma-ray source observations. We present a Transformer-based deep learning model for gamma-ray direction reconstruction. Using six months of Crab Nebula observations, this method improves the angular resolution compared with traditional...

This poster carries out parallel optimization for the G4KM2A cosmic ray simulation program based on the Paralux heterogeneous parallel scheduling technology. The optimization significantly improves the simulation efficiency of high energy cosmic ray events.

Radio-quiet active galactic nuclei (AGNs) have recently emerged as a potential population of high-energy gamma-ray emitters. Using 15 years of Fermi-LAT observations, we previously reported a significant stacked gamma-ray signal from a sample of nearby, hard-X-ray-bright radio-quiet AGNs, revealing their average spectral energy distribution (SED) up to hundreds of GeV. However, their emission...

Using the All-sky Root around in an Unbiased way (ARU) software, we search or transients within the daily-integrated LHAASO-WCDA maps. This approach has the advantage that does not require to assume a functional form of the observed data or the diffuse emissions from the galaxy. We show the results for Mrk 421 and NGC 1275 as for other variable galactic sources.

Using the publicly available observational data from LHAASO, we conducted a detailed study of the gamma-ray emission properties of the source 1858+0330 in the TeV energy range. This analysis utilizes the latest data set: for the Water Cherenkov Detector Array (WCDA, using the Cod version data covering 1–25 TeV and divided into 7 energy bins), the observation period is from March 5, 2021 to...

We search for very-high-energy gamma-ray emission from M31 using LHAASO data, covering 0.63–10 TeV with WCDA and 25–2500 TeV with KM2A. With two spatial models, a point source and an HI gas template, we find no significant signal and derive 95% confidence level flux upper limits in individual energy bins. At a distance of 780 kpc, the point-source limits correspond to luminosities of order...