Reproducibility and monitoring of the instrumental particle background for the x-ray integral field unit
Date Issued
2018
Author(s)
Cucchetti, E.
•
Pointecouteau, E.
•
Barret, D.
•
•
•
•
Pajot, F.
•
Peille, P.
•
•
Pratt, G. W.
Abstract
The X-ray Integral Field Unit (X-IFU) is the cryogenic imaging spectrometer on board the future X-ray observatory Athena. With a hexagonal array of 3840 AC-biased Transition Edge Sensors (TES), it will provide narrow-field observations (5' equivalent diameter) with unprecedented high spectral resolution (2.5 eV up to 7 keV) over the 0.2 - 12 keV bandpass. Throughout its observations, the X-IFU will face various sources of X-ray background. Specifically, the so-called Non-X-ray Background (NXB) caused by the interaction of high-energy cosmic rays with the instrument, may lead to a degradation of its sensitivity in the observation of faint extended sources (e.g. galaxy clusters outskirts). To limit this effect, a cryogenic anti-coincidence detector (CryoAC) will be placed below the detector plane to lower the NXB level down to the required level of 5⊗10-3 cts/s/cm2/keV over 2 - 10 keV. In this contribution, we investigate ways to accurately monitor the NXB and ensure the highest reproducibility in-flight. Using the limiting science case of the background-dominated observation of galaxy clusters outskirts, we demonstrate that a reproducibility of 2% on the absolute knowledge of the background is required to perform driving science objectives, such as measuring abundances and turbulence in the outskirts. Monitoring of the NXB in-flight through closed observations, the detector's CryoAC or the companion instrument (Wide Field Imager) will be used to meet this requirement.
Coverage
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
All editors
den Herder, Jan-Willem A.; Nikzad, Shouleh; Nakazawa, Kazuhiro
Series
Volume
10699
Start page
106994N
Conferenece
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Conferenece place
Austin, Texas, United States
Conferenece date
10-15 June, 2018
Issn Identifier
0277-786X
Ads BibCode
2018SPIE10699E..4NC
Rights
open.access
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