Fermi-LAT and FAST observation of the gamma-ray binary HESS J0632+057

Using 15 years of data from the Fermi Large Area Telescope (Fermi-LAT), we performed a comprehensive analysis on the gamma-ray binary HESS J0632+057. Its spectrum in 0.1–300 GeV band is well described by a power law model with an index of $2.40\pm 0.16$, leading to an energy flux of (5.5±1.6)× 10⁻¹² erg cm⁻² s⁻¹. The GeV Spectral Energy Distribution (SED) of HESS J0632+057 hints for a spectral turn-over between ∼10-100 GeV. Orbital analysis reveals a flux enhancement during the phase range of 0.2-0.4, consistent with the X-ray and TeV light curves, indicating an origin of a common particle population. We carried out six deep radio observations on HESS J0632+057 with the Five-hundred-meter Aperture Spherical Telescope (FAST), evenly distributed across its orbit, reaching a detection sensitivity of 2μJy. However, no radio pulsation was detected within these observations. The absence of radio pulsation may be attributed to the dense stellar wind environment of HESS J0632+057.