EDP Sciences
Free access
Volume 481, Number 3, April III 2008
Page(s) 919 - 921
Section Astronomical instrumentation
DOI http://dx.doi.org/10.1051/0004-6361:200809458
Published online 18 February 2008

A&A 481, 919-921 (2008)
DOI: 10.1051/0004-6361:200809458

Soft X-ray in-flight calibration of the ROSAT PSPC

K. Beuermann

Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
    e-mail: beuermann@astro.physik.uni-goettingen.de

(Received 25 January 2008 / Accepted 6 February 2008)

Aims. We present an in-flight calibration of the ROSAT PSPC using the incident spectra of the hot white dwarf HZ43 and the polar AM Her.
Methods. We derive an absolute flux calibration of the PSPC using the accurately known soft X-ray spectrum of HZ43. Corrections to the PSPC response matrix are derived from a comparison of predicted and observed PSPC spectra of HZ43, supplemented by results for AM Her.
Results. The calibration of the PSPC for photon energies E<0.28 keV is found to be accurate to better than 5% refuting earlier reports of a major miscalibration. Our corrections to the detector response matrices remove systematic residuals in the pulse height spectra of soft sources.

Key words: methods: data analysis -- stars: individual: HZ43 -- stars: individual: AM Her -- X-rays: stars

© ESO 2008