Where can I read more about the background?
For the HRI, read the HRI Report (under /rosat/doc/hri/hri_report/)
For the PSPC, the following references are recommended:
- The Particle Background of the ROSAT PSPC,
Snowden, Plucinsky, Briel, Hasinger & Pfefferman , (1992,
ApJ, 393, 819
- A detailed description of the ROSAT PSPC particle induced background.
The PSPC rejection efficiency for these spurious events is exceptionally
high with a residual count rate of roughly 5E-6 counts/sec/arcmin^2/keV.
About 77 precent of events enter through the detector, while the remainder
enter through the counter window. During typical conditions the count rate
of the residual counts is well correlated with the Master Veto rate. The
spectrum of residual events consists of a flat component, a soft power-
law, and an Al K alpha line at 1.5 keV. Typically, the ratio between the
power-law and flat components remains constant to +/-4 percent, while the relative
Al K alpha contribution increases with increasing MV count rate. The
distribution of counts over the field is uniform except for a slight radial
dependance and shadowing caused by blockage of the externally produced
component by the window support structure.
- Updated Calibration of the ROSAT PSPC Particle Background,
Plucinsky, Snowden, Hasinger, Briel, and Pfeffermann
(1993, ApJ, 418, 519)
- An update of the 1992 Snowden et al. paper. Includes the post gain change
- Generation of Energy Dependant Exposure Maps for ROSAT PSPC Analysis, Mendenhall, Snowden, Burrows ( Penn State preprint, June 1992)
- The importance of energy dependant exposure maps for the analysis of ROSAT
PSPC data is demonstrated. Although current SASS-generated exposure maps,
based on a single, band-limited instrument map, are reasonably valid for
central energies of the ROSAT bandpass, analysis of softer bands (<0.20 keV)
are strongly affected by 'ghost' images. Correction for such effects is
critical for studies of extended objects and the diffuse X-ray background,
and may also affect the identification of soft point sources. The authors
present a method of generating energy-dependant exposure maps (7 bands) for
any PSPC pointed observation. These maps are based on instrument maps
generated from all-sky survey data (similar to the currently-used
instrument map except for dividing the total PSPC bandpass into additional
energy bands). Application of these maps will allow for accurate analysis
over the entire PSPC bandpass.
- Analysis of ROSAT XRT/PSPC Observations of Extended Objects and
the Diffuse Background Snowden, McCammon, Burrows, and Mendenhall (1994, ApJ, in press)
- A "Here there be dragons" memo for those interested in reducing PSPC
observations in order to study extended objects of the SXRB.
- The Scattered Solar X-ray Background of the ROSAT PSPC
Snowden and Freyberg (1993, ApJ, 404, 403)
- This paper models the scattered solar X-ray background as seen by the ROSAT PSPC. The temporal and geometric variation of this background component is modeled and well reproduces the observed light curves. The spectral distribution is also modeled with good results.
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