Cross-calibrating X-ray detectors with clusters of galaxies: an IACHEC study

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Table 7

Systematic effects on the temperature measurement.

Source	σ_T/T	Comments


MEKAL^a
Background	<2%	EPIC and ACIS, propagated
PSF	≪2%	EPIC and ACIS, not propagated
T gradient	< 0.1%	EPIC and ACIS, not propagated

Σ	< 2%

Fe XXV/XXVI^b
Limited counts	<2%	EPIC
Energy resolution	2%	pn only
Gain	1−3%	EPIC
MEKAL/APEC	2%	EPIC
Σ	4%	propagated

Notes.

^(a)

Temperature measurements using the MEKAL model in the hard band;

^(b)

temperature measurements using the Fe XXV/XXVI line ratio.

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