Sgr E: a distant witness of Sgr A*.s past activity

We propose 100 ks of XMM observation to complete the survey of the diffuse Xrayemission towards the Galactic west and capture the echo of Sgr A*.s pastoutbursts before they leave the central molecular zone (CMZ). This observationof the distant molecular cloud Sgr E, with XMM.s large effective area, isrequired to probe putative old outbursts from Sgr A*. It will allow us tocomplete our global study of the Galactic center Xray diffuse emission, whichconcludes that multiple short events happening few hundred years ago arecurrently propagating through the Galaxy.s CMZ. By applying the spectraltechnique we have recently developped to the data of this Sgr E observation, wewill extend our reconstruction of the past activity of Sgr A* to epochs beyond 300 yr ago. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]