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GeV γ-ray emission in the star-forming region S140

  • Li-Nuo Yang
  • Pak-Hin Thomas Tam
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Abstract

We report the detection of a GeV γ-ray source in the S140 HII region using 17.75 years of Fermi-LAT data, with a source-detection significance of ~32.1σ in the 0.1-500 GeV energy band. The emission is significantly extended (AIC evidence ratio above 1 GeV is 2x10^9) and is therefore designated as 4FGL J2220.8+6319e. The γ-ray emission coincides spatially with a molecular cloud that hosts the massive young stellar object S140 IRS1. Its spectrum is best fitted by a log-parabolic spectrum (TS_cur(LP) = 104.1) and can be reproduced by both hadronic and leptonic models. The jet driven by S140 IRS1 offers a viable particle acceleration site, yielding injection timescales and maximum particle energies consistent with theoretical expectations, whereas stellar winds are energetically disfavored.

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Cite

BibTeXRIS
BibTeX
@misc{yang2026γray,
  title = {{GeV γ-ray emission in the star-forming region S140}},
  author = {Li-Nuo Yang and Pak-Hin Thomas Tam},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.05809},
  eprint = {2608.05809},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.05809},
}
RIS
TY  - UNPB
TI  - GeV γ-ray emission in the star-forming region S140
AU  - Li-Nuo Yang
AU  - Pak-Hin Thomas Tam
PY  - 2026
DA  - 2026/08/06
PB  - arXiv
DO  - 10.48550/arxiv.2608.05809
UR  - https://arxiv.org/abs/2608.05809
AB  - We report the detection of a GeV γ-ray source in the S140 HII region using 17.75 years of Fermi-LAT data, with a source-detection significance of ~32.1σ in the 0.1-500 GeV energy band. The emission is significantly extended (AIC evidence ratio above 1 GeV is 2x10^9) and is therefore designated as 4FGL J2220.8+6319e. The γ-ray emission coincides spatially with a molecular cloud that hosts the massive young stellar object S140 IRS1. Its spectrum is best fitted by a log-parabolic spectrum (TS_cur(LP) = 104.1) and can be reproduced by both hadronic and leptonic models. The jet driven by S140 IRS1 offers a viable particle acceleration site, yielding injection timescales and maximum particle energies consistent with theoretical expectations, whereas stellar winds are energetically disfavored.
ER  -