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Title: Cross-calibration of the XMM-Newton EPIC pn and MOS on-axis effective areas using 2XMM sources
Authors: Read, Andrew M.
Guainazzi, M.
Sembay, S.
First Published: 1-Apr-2014
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, 2014, 564, pp. ?-? (7)
Abstract: Aims. We aim to examine the relative cross-calibration accuracy of the on-axis effective areas of the XMM-Newton EPIC pn and MOS instruments. Methods. Spectra from a sample of 46 bright, high-count, non-piled-up, isolated on-axis point sources are stacked together, and model residuals are examined to characterize the EPIC MOS-to-pn inter-calibration. Results. The MOS1-to-pn and MOS2-to-pn results are broadly very similar. The cameras show the closest agreement below 1 keV, with MOS excesses over pn of 0–2% (MOS1/pn) and 0–3% (MOS2/pn). Above 3 keV, the MOS/pn ratio is consistent with energy-independent (or only mildly increasing) excesses of 7–8% (MOS1/pn) and 5–8% (MOS2/pn). In addition, between 1–2 keV there is a “silicon bump” − an enhancement at a level of 2–4% (MOS1/pn) and 3–5% (MOS2/pn). Tests suggest that the methods employed here are stable and robust. Conclusions. The results presented here provide the most accurate cross-calibration of the effective areas of the XMM-Newton EPIC pn and MOS instruments to date. They suggest areas of further research where causes of the MOS-to-pn differences might be found, and allow the potential for corrections and possible rectification of the EPIC cameras to be made in the future.
DOI Link: 10.1051/0004-6361/201423422
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © ESO 2014. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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