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The H.E.S.S. Galactic Plane Survey (HGPS) revealed 78 TeV sources among which47 are not clearly associated with a known object. We present a multiwavelengthapproach to constrain the origin of the emission from unidentified HGPSsources. We present a generic pipeline that explores a large database ofmultiwavelength archival data toward any region in the Galactic plane. Alongwith a visual inspection of the retrieved multiwavelength observations tosearch for faint and uncataloged counterparts, we derive a radio spectral indexthat helps disentangle thermal from nonthermal emission and a mean magneticfield through X-ray and TeV data in case of a leptonic scenario. We also searchfor a spectral connection between the GeV and the TeV regimes with theFermi-LAT cataloged sources that may be associated with the unidentified HGPSsource. We complete the association procedure with catalogs of known objectsand with the source catalogs from instruments whose data are retrieved. Themethod is applied on two unidentified sources, namely HESS J1427$-$608 and HESSJ1458$-$608, for which the multiwavelength constraints favor the pulsar windnebula (PWN) scenario. We model their broadband nonthermal spectra in aleptonic scenario with a magnetic field $B \lesssim 10$ $\mu$G, which isconsistent with that obtained from ancient PWNe. We place both sources withinthe context of the TeV PWN population to estimate the spin-down power and thecharacteristic age of the putative pulsar. We also shed light on two possiblysignificant $\gamma$-ray excesses in the HGPS: the first is located in thesouth of the unidentified source HESS J1632$-$478 and the second is spatiallycoincident with the synchrotron-emitting supernova remnant G28.6$-$0.1. Themultiwavelength counterparts found toward both $\gamma$-ray excesses make thesepromising candidates for being new very-high energy $\gamma$-ray sources.

Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427$-$608, HESS J1458$-$608, and new VHE $\gamma$-ray source candidates