The energy-dependent temporal variation of the ROSAT PSPC gain.

Details The energy-dependent temporal variation of the ROSAT PSPC gain. The energy-dependent temporal variation of the ROSAT PSPC gain.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120..187p&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.187-193

Astronomy and Astrophysics

Astrophysics

9

Instrumentation: Detectors, Methods: Data Analysis, Methods: Observational, X-Rays: General, Space Vehicles

Scientific paper

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 ~1% 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.

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