GeV γ-ray emission in the star-forming region S140
Li-Nuo Yang, Pak-Hin Thomas Tam
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 2x109) 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 (TScur(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.
Create a lesson
Related papers
Radiation-Driven Magnetic Fields in Sub-Keplerian Accretion Flows: An Alternative to MRI
Mukesh Kumar Vyas, Asaf Pe'er
Studying the Intermittency of Magnetized Interstellar Medium by Synchrotron Polarization Intensity and its Gradient
Ru-Yue Wang, Jian-Fu Zhang
WFST Follow-up of S251112cm: Searching for an Optical Counterpart to a Subsolar-mass Compact-binary Merger Candidate
Zhengyan Liu, Zelin Xu, Ji-an Jiang et al.
The unidentified PeV source LHAASO J2108+5157: A microquasar remnant?
Josep Mart\'ı, Pedro L. Luque-Escamilla, Leandro Abaroa et al.
Toward Autonomous Radio Follow-up of Multi-messenger Transients with RADAR: From Alert Parsing to Inference and Observation Scheduling
Mihael Hategan-Marandiuc, Tanner O'Dwyer, Alessandra Corsi et al.
Detectability of 100 TeV Gamma Rays from PeV Cosmic Rays Accelerated in the Early Phase of a Supernova Shock Wave
Tomotaka Nishikawa, Tsuyoshi Inoue, Alexandre Marcowith