Fermi-LAT Detection of the Young SuperNova Remnant Tycho

Abstract

After almost three years of data taking in sky survey mode, the \emph{Fermi}-LAT has detected ${\hat{I}}^3$-ray emission toward the Tycho's Supernova Remnant (SNR). The Tycho SNR is among the youngest remnants in the Galaxy, originating from a Type Ia Supernova in AD 1572. The ${\hat{I}}^3$-ray integral flux from 400 MeV up to 100 GeV has been measured to be (3.5$\pm 1.1_{stat}\pm 0.7_{syst}$)$\times 10^{-9}$ cm${}^{-2}$s${}^{-1}$ with a photon index of 2.3$\pm 0.2_{stat}\pm 0.1_{syst}$.