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

Abstract

HESS J1534-571 is a very high energy gamma-ray source that was discovered by the H.E.S.S. observatory and reported as one of several new sources with a shell-like morphology at TeV energies, matching in size and location with the supernova remnant G323.7-1.0 discovered in radio observations by the Molonglo Galactic 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 new GeV source using data from the \emph{Fermi} satellite that is compatible in extension with the radio supernova remnant and shows a very hard power-law spectrum ($\frac{dN}{dE}\propto E^{-1.35}$) is presented here, together with the first broadband modeling of the nonthermal emission from this source. It is shown that leptonic emission is compatible with the known multiwavelength data and a corresponding set of physical source parameters is given. The required total energy budget in leptons is reasonable, $\sim 1.5\times 10^{48}$ erg for a distance to the object of $5$ kpc. The new GeV observations imply that a hadronic scenario, on the other hand, requires a cosmic ray spectrum that deviates considerably from theoretical expectations of particle acceleration.

Accepted for publication in ApJ

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Cited by in corpus (7)

• Classification of Fermi-LAT unidentified gamma-ray sources using CatBoost gradient boosting decision trees
• TeV cosmic ray nuclei acceleration in shell-type supernova remnants with hard $\gamma$-ray spectra
• Detection of GeV $\gamma$-ray emission in the direction of HESS J1731-347 with Fermi-LAT
• Fermi-LAT detection of G118.4+37.0: a supernova remnant in the Galactic halo seen around the Calvera pulsar
• G279.0+1.1: a new extended source of high-energy gamma rays
• Fermi-LAT detection of GeV $\gamma$-ray emission from Type Ia supernova remnant G272.2-3.2
• XMM-Newton observations of the TeV-discovered supernova remnant HESS J1534-571