2025ApJ...980..208B

The extended ultra-high-energy (UHE) gamma-ray source HAWC J1844-034 is closely associated with two other sources, HAWC J1843-032 and HWC J1846-025. Moreover, other gamma-ray observatories like HESS, LHAASO, and Tibet AS_γ have detected UHE gamma-ray sources whose spatial positions coincide with the position of HAWC J1844-034. The UHE gamma-ray data from several observatories aid analysis of the spectral features of this source in detail at teraelectronvolt energies. Of the four pulsars near HAWC J1844-034, PSR J1844-0346 is closest to it and possibly supplies the cosmic-ray leptons to power this source. We have analyzed the Fermi-Large Area Telescope (LAT) data to explore this source's morphology and identify its spectral features in the Fermi-LAT energy band. After removing the contribution of the pulsar to the gamma-ray spectral energy distribution (SED) by pulsar-phased analysis, we obtained upper limits on the photon flux and identified the gigaelectronvolt counterpart PS J1844.2-0342 in the Fermi-LAT energy band with more than 5σ significance, which may be a pulsar wind nebula (PWN). Finally, the multiwavelength SED is modeled, assuming HAWC J1844-034 is a PWN.