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Astronomy and Astrophysics Supplement Series, Vol. 120, November II 1996, 187-193
The energy-dependent temporal variation of the ROSAT PSPC gain
M.A. Prieto 
, G. Hasinger 
and
S.L. Snowden 
Send offprint requests to: M.A. Prieto
Max-Plank-Inst. für extraterrestrische Physik, Germany
alm@rosat.mpe-garching.mpg.de
Astrophysikalisches Institut Potsdam, Germany
ghasinger@aip.de
USRA/Goddard Space Flight Center
snowden@lheavx.gsfc.nasa.gov
Received August 29, 1995; accepted February 24, 1996
Abstract:
The existence of systematic spectral-fit residuals in ROSAT PSPC spectra, and their dependence on time, is by now a well established fact. This paper describes how those residuals may be related to second order variations of the gain of the PSPC as a function of energy and time. As a result, the energy scale used for the interpretation of PSPC spectra can be incorrect producing significant systematic effects, in particular at energies where the effective area of the instrument changes rapidly. A monotonic gain decay of
per year is measured at 1 keV. A quantitative description of
the PSPC gain-time variation as a function of energy is provided. The
functional dependence of this variation is found to be well
represented by a second order polynomial.
Key words: instrumentation: detectors --- methods: data analysis --- methods: observational --- X-rays: general --- space vehicles
web@edpsciences.com
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