Astrophysical Journal 750 (2012) 94
Abstract
We report on the discovery of high-energy (HE; E > 0.1GeV) and very high-energy (VHE; E > 100GeV) γ-ray emission from the high-frequency-peaked BL Lac object RBS 0413. VERITAS, a ground-based VHE gamma-ray observatory, detected VHE γ rays from RBS 0413 with a statistical significance of 5.5 standard deviations (σ) and a γ-ray flux of (1.5±0.6stat ±0.7syst)×10−8 photons m−2 s−1 (0.9% of the Crab Nebula flux) for E > 250GeV. The observed spectrum can be described with a power law having a photon index of Γ = 3.18 ± 0.68stat ± 0.30syst. Contemporaneous observations with the Large Area Telescope (LAT) on the Fermi γ-ray Space Telescope detected HE γ rays from RBS 0413 with a statistical significance of more than 9 σ. We present the results from Fermi -LAT and VERITAS, including a spectral energy distribution (SED) modeling of the γ-ray, quasi-simultaneous X-ray (Swift -XRT), ultraviolet (Swift -UVOT) and R-band optical (MDM) data.
