eROSITA Calibration Products

ARFs and RMFs

The ARFs were composed of QE measurements for a prototype eROSITA CCD with a 200 nm on-chip Al filter at BESSY, calculated effective area measurements of one eROSITA mirror assembly (based on ray tracing and averaged over the FoV), and calculated filter transmissions. They contain the effective areas which result from selecting all valid patterns; the loss of sensitivity which results from selecting only specific patterns is taken into account in the normalization of the RMFs.

AMF for 100 nm Al + 200 nm PI AMF for 200 nm Al + 200 nm PI AMF for 200 nm PI

The RMFs were derived from measurements of a prototype eROSITA CCD with a 200 nm on-chip Al filter at BESSY, which were processed with a low energy threshold of ~50 eV. It is likely that the energy resolution after launch will be somewhat lower, due to the need to raise the low energy threshold (for telemetry reasons) and due to radiation damage (which will increase with time). Due to the presence of the on-chip filter these are "type b" RMFs (see below). The RMFs for singles, doubles, triples, and quadruples contain the energy dependent pattern fractions in their normalizations.

RMF for singles RMF for doubles RMF for triples RMF for quadruples RMF for all valid patterns