Searching for $\gamma$-ray emission from a bona fide Compact Symmetric Object sample: a $\gamma$-ray signal near GB6 J0906+4124
As a particular subclass of active galactic nuclei (AGNs), compact symmetric objects (CSOs) have attracted significant attention due to potential role as young AGNs. Several $\gamma$-ray emitting CSOs have been detected with Fermi Large Area Telescope (Fermi-LAT), which motivates further searches for more $\gamma$-ray emitting CSOs. We perform a systematic search for $\gamma$-ray emission from a bona fide CSO sample using 16 yr Fermi-LAT observation data. No significant $\gamma$-ray signal is found to be firmly associated with any CSO. Only one $\gamma$-ray signal is detected near CSO GB6 J0906+4124 with TS = 28.7 ($\sim4.9\sigma$) in 0.1--300 GeV band. Within the 68\% containment radius of Fermi-LAT average PSF at 3 GeV, GB6 J0906+4124 remains the plausible counterpart of the $\gamma$-ray signal, primarily due to its classification and broad spectral coverage. This work suggests that GeV emission from CSOs may either be uncommon or simply below the current Fermi-LAT detection sensitivity. Further multi-wavelength follow-up is needed to determine the origin of the $\gamma$-ray signal near GB6 J0906+4124.