Observation of the $\gamma$-ray Emission from W43 with LHAASO

Abstract

In this paper, we report the detection of the very-high-energy (VHE, $100\mathrm{GeV}<E<100\mathrm{TeV}$) and ultra-high-energy (UHE, $E>100\mathrm{TeV}$) $\gamma$-ray emissions from the direction of the young star-forming region W43, observed by the Large High Altitude Air Shower Observation (LHAASO). The extended $\gamma$-ray source was detected with a significance of $\sim 16\sigma$ by KM2A and $\sim 17\sigma$ by WCDA, respectively. The angular extension of this $\gamma$-ray source is about 0.5 degrees, corresponding to a physical size of about 50 pc. We discuss the origin of the $\gamma$-ray emission and possible cosmic ray acceleration in the W43 region using multi-wavelength data. Our findings suggest that W43 is likely another young star cluster capable of accelerating cosmic rays (CRs) to at least several hundred TeV.

11 pages, 2 figures, and 3 tables. Accepted for publication in SCPMA

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• High Energy Emission from the Galactic Center
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• How interacting winds shape the mechanical feedback of massive star clusters over millions of years
• Young Massive Star Clusters as TeV Emitters: Constraints from H.E.S.S. and LHAASO