Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427−608, HESS J1458−608, and new VHE <i>γ</i>-ray source candidates

The H.E.S.S. Galactic Plane Survey (HGPS) revealed 78 TeV sources among which 47 are not clearly associated with a known object. We present multiwavelength approach to constrain the origin of emission from unidentified HGPS sources. generic pipeline that explores large database archival data toward any region in plane. Along visual inspection retrieved observations search for faint and uncataloged counterparts, we derive radio spectral index helps disentangle thermal nonthermal mean magnetic field through X-ray case leptonic scenario. also connection between GeV regimes Fermi-LAT cataloged may be source. complete association procedure catalogs objects source instruments whose retrieved. method is applied on two sources, namely HESS J1427$-$608 J1458$-$608, constraints favor pulsar wind nebula (PWN) model their broadband spectra scenario $B \lesssim 10$ $\mu$G, consistent obtained ancient PWNe. place both within context PWN population estimate spin-down power characteristic age putative pulsar. shed light possibly significant $\gamma$-ray excesses HGPS: first located south J1632$-$478 second spatially coincident synchrotron-emitting supernova remnant G28.6$-$0.1. counterparts found make these promising candidates being new very-high energy