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arXiv · 2610.41163

HAWC, Fermi-LAT and Chandra Detections of High Energy Particles in the S106 Star Forming Region

Rishi Babu·Stephen DiKerby·Tulun Ergin·Shuo Zhang·Mehr Un Nisa·the HAWC Collaboration
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Abstract

Local star-forming regions have recently been the subject of scrutiny as cosmic-ray accelerators and sources of ultra-high-energy gamma-ray emissions. The Cygnus-X region is one of the richest star forming regions in the galaxy and over the last few decades has been extensively studied. Here we report the detection of a star-forming region located in the southern part of Cygnus-X, Sharpless 106 (S106), using the HAWC Observatory. The S106 region is spatially located near the cataloged gamma-ray source 1LHAASO J2027+3657. In this work, we perform a multi-wavelength analysis of S106, by combining HAWC data with re-analysis of Fermi-LAT and archival Chandra data. We construct a fully leptonic model for the multi-wavelength emission from S106 from a single population of high-energy leptons, with the gamma-rays greater than 1 TeV being produced by inverse Compton scattering of the locally-produced IR photon field from S106 itself. Our models show that hadronic mechanisms are not always required to explain the observed flux from gamma-ray star-forming regions and that understanding the specific details of local photon fields is crucial to modeling the multi-wavelength emission from star-forming regions.

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Rishi Babu, Stephen DiKerby, Tulun Ergin, Shuo Zhang, Mehr Un Nisa, the HAWC Collaboration. 2026-10-30. HAWC, Fermi-LAT and Chandra Detections of High Energy Particles in the S106 Star Forming Region. https://arxiv.org/abs/2610.41163

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