Energy reconstruction for events detected in TES X-ray detectors

Astronomical Data Analysis Software an Systems XXIV.The processing of the X-ray events detected by a TES (Transition Edge Sensor) device (such as the one that will be proposed in the ESA AO call for instruments for the Athena mission (Nandra et al. 2013) as a high spectral resolution instrument, XIFU (Barret et al. 2013)), is a several step procedure that starts with the detection of the current pulses in a noisy signal and ends up with their energy reconstruction. For this last stage, an energy calibration process is required to convert the pseudo energies measured in the detector to the real energies of the incoming photons, accounting for possible nonlinearity effects in the detector. We present the details of the energy calibration algorithm we implemented as the last part of the Event Processing software that we are developing for the X-IFU instrument, that permits the calculation of the calibration constants in an analytical way.This work has been funded by the Spanish Ministry of Science and Innovation (MICINN) and Spanish Ministry of Economy and Competitiveness (MINECO) under projects ESP2006-13608-C02-01, AYA2009-08059, AYA2010-21490-C02-01, AYA2012-39767-C02-01.Peer reviewe