Multiwavelength spectrum of the HESS J1818-154 / G15.4+0.1 system

DANIEL SUPANITSKY; GABRIELA CASTELLETTI; JORGE LEONARDO SUPÁN

Córdoba

Congreso; 57a Reunión Anual de la AAA; 2014

Observatorio Astronómico de Córdoba

Since its discovery, the TeV source HESS J1818-154 has been linked to the supernova remnant (SNR) G15.4+0.1. Both inverse Compton (IC) mechanism and neutral pion decay of accelerated protons were used to explain the observed TeV gamma-ray flux. The former was invoked since the detection of diffuse X-ray emission from a region compatible with the extended HESS source, while the discovery of dense molecular clouds interacting with the SNR was considered an argument to favor a hadronic scenario. We present the updated broad-band spectral energy distribution (SED) of G15.4+0.1 including new radio data from the GMRT and VLA interferometers, X-ray observations from XMM-Newton, and gamma-ray fluxes from H.E.S.S. We also used hadronic and leptonic-only models to explore the contributions that the proposed mechanisms makes to the overall spectrum of G15.4+0.1.