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HESS J1534-571 is a very high energy gamma-ray source that was discovered bythe H.E.S.S. observatory and reported as one of several new sources with ashell-like morphology at TeV energies, matching in size and location with thesupernova remnant G323.7-1.0 discovered in radio observations by the MolongloGalactic Plane Survey. Many known TeV shells also show X-ray emission, however,no X-ray counterpart has been seen for HESS J1534-571. The detection of a newGeV source using data from the \emph{Fermi} satellite that is compatible inextension with the radio supernova remnant and shows a very hard power-lawspectrum ($\frac{dN}{dE} \propto E^{-1.35}$) is presented here, together withthe first broadband modeling of the nonthermal emission from this source. It isshown that leptonic emission is compatible with the known multiwavelength dataand a corresponding set of physical source parameters is given. The requiredtotal energy budget in leptons is reasonable, $\sim 1.5\times10^{48}$ erg for adistance to the object of $5$ kpc. The new GeV observations imply that ahadronic scenario, on the other hand, requires a cosmic ray spectrum thatdeviates considerably from theoretical expectations of particle acceleration.

Detection of GeV Gamma-rays from HESS J1534-571 and Multiwavelength Implications for the Origin of the Non-thermal Emission