1LHAASO J1852+0050u: GeV-100TeV Gamma-ray emission Powered by Star-forming Region?

@misc{cao20261lhaaso,
  title = {{1LHAASO J1852+0050u: GeV-100TeV Gamma-ray emission Powered by Star-forming Region?}},
  author = {Zhen Cao and F Aharonian and Y.X Bai and Y.W Bao and D Bastieri and X.J Bi and Y.J Bi and W Bian and J Blunier and A.V Bukevich and C.M Cai and Y.Y Cai and W.Y Cao and Zhe Cao and J Chang and J.F Chang and E.S Chen and G.H Chen and H.K Chen and L.F Chen and Liang Chen and Long Chen and M.J Chen and M.L Chen and Q.H Chen and S Chen and S.H Chen and S.Z Chen and T.L Chen and X.B Chen and X.J Chen and X.P Chen and Y Chen and N Cheng and Q.Y Cheng and Y.D Cheng and M.Y Cui and S.W Cui and X.H Cui and Y.D Cui and B.Z Dai and H.L Dai and Z.G Dai and M Danzengluobu and Y.X Diao and A.J Dong and X.Q Dong and K.K Duan and J.H Fan and Y.Z Fan and J Fang and J.H Fang and K Fang and C.F Feng and H Feng and L Feng and S.H Feng and X.T Feng and Y Feng and Y.L Feng},
  howpublished = {Mon.Not.Roy.Astron.Soc.},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.09763},
  eprint = {2609.09763},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05761241v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - 1LHAASO J1852+0050u: GeV-100TeV Gamma-ray emission Powered by Star-forming Region?
AU  - Zhen Cao
AU  - F Aharonian
AU  - Y.X Bai
AU  - Y.W Bao
AU  - D Bastieri
AU  - X.J Bi
AU  - Y.J Bi
AU  - W Bian
AU  - J Blunier
AU  - A.V Bukevich
AU  - C.M Cai
AU  - Y.Y Cai
AU  - W.Y Cao
AU  - Zhe Cao
AU  - J Chang
AU  - J.F Chang
AU  - E.S Chen
AU  - G.H Chen
AU  - H.K Chen
AU  - L.F Chen
AU  - Liang Chen
AU  - Long Chen
AU  - M.J Chen
AU  - M.L Chen
AU  - Q.H Chen
AU  - S Chen
AU  - S.H Chen
AU  - S.Z Chen
AU  - T.L Chen
AU  - X.B Chen
AU  - X.J Chen
AU  - X.P Chen
AU  - Y Chen
AU  - N Cheng
AU  - Q.Y Cheng
AU  - Y.D Cheng
AU  - M.Y Cui
AU  - S.W Cui
AU  - X.H Cui
AU  - Y.D Cui
AU  - B.Z Dai
AU  - H.L Dai
AU  - Z.G Dai
AU  - M Danzengluobu
AU  - Y.X Diao
AU  - A.J Dong
AU  - X.Q Dong
AU  - K.K Duan
AU  - J.H Fan
AU  - Y.Z Fan
AU  - J Fang
AU  - J.H Fang
AU  - K Fang
AU  - C.F Feng
AU  - H Feng
AU  - L Feng
AU  - S.H Feng
AU  - X.T Feng
AU  - Y Feng
AU  - Y.L Feng
PY  - 2026
DA  - 2026/09/09
PB  - Mon.Not.Roy.Astron.Soc.
DO  - 10.48550/arxiv.2609.09763
UR  - https://hal.science/hal-05761241v1
AB  - Star-forming regions (SFRs), including HII regions, have recently attracted significant attention as potential sites of particle acceleration capable of producing PeV cosmic rays, i.e. as potential Galactic PeVatrons. Yet, SFRs known as candidate PeVatrons are still very rare. Here we report a highly likely physical association between the UHE gamma-ray source 1LHAASO J1852+0050u and coincident star-forming regions. Using ∼4 years of LHAASO data, the extended source 1LHAASO J1852+0050u (called J1852 in this study) was reanalyzed with a significance of ∼13σ and 39%-containment radius of 0.35°. This extended source projectively covers dozens of HII regions and an energetic pulsar PSR J1853+0056. We reanalyzed ∼16 years of Fermi-LAT data and found a GeV source (named SrcAG) coincident with the LHAASO source J1852. The CO-line observation shows a molecular clump which coincides with the gamma-ray sources and is related with the ultra-compact HII region G34.26+0.15 at the distance of ∼3.3 kpc. Fitting to the spectral energy distribution indicates that PSR J1853+0056 cannot afford the observed gamma-ray flux either for J1852 or SrcAG. Although the contribution from hidden pulsars to the gamma-ray emission could not be excluded, it is most likely that the GeV-100TeV gamma-ray emission is dominantly powered by SFR through p-p hadronic interaction between the protons accelerated in the SFR and MCs: the GeV emission is ascribed to the protons accelerated by protostars' activities, while the TeV emission ascribed to the protons accelerated by massive stars in the SFR.
ER  -